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/*jslint browser: true*/
/*jslint jquery: true*/

/*
 * jQuery Hotkeys Plugin
 * Copyright 2010, John Resig
 * Dual licensed under the MIT or GPL Version 2 licenses.
 *
 * Based upon the plugin by Tzury Bar Yochay:
 * https://github.com/tzuryby/jquery.hotkeys
 *
 * Original idea by:
 * Binny V A, http://www.openjs.com/scripts/events/keyboard_shortcuts/
 */

/*
 * One small change is: now keys are passed by object { keys: '...' }
 * Might be useful, when you want to pass some other data to your handler
 */

(function(jQuery) {

  jQuery.hotkeys = {
    version: "0.2.0",

    specialKeys: {
      8: "backspace",
      9: "tab",
      10: "return",
      13: "return",
      16: "shift",
      17: "ctrl",
      18: "alt",
      19: "pause",
      20: "capslock",
      27: "esc",
      32: "space",
      33: "pageup",
      34: "pagedown",
      35: "end",
      36: "home",
      37: "left",
      38: "up",
      39: "right",
      40: "down",
      45: "insert",
      46: "del",
      59: ";",
      61: "=",
      96: "0",
      97: "1",
      98: "2",
      99: "3",
      100: "4",
      101: "5",
      102: "6",
      103: "7",
      104: "8",
      105: "9",
      106: "*",
      107: "+",
      109: "-",
      110: ".",
      111: "/",
      112: "f1",
      113: "f2",
      114: "f3",
      115: "f4",
      116: "f5",
      117: "f6",
      118: "f7",
      119: "f8",
      120: "f9",
      121: "f10",
      122: "f11",
      123: "f12",
      144: "numlock",
      145: "scroll",
      173: "-",
      186: ";",
      187: "=",
      188: ",",
      189: "-",
      190: ".",
      191: "/",
      192: "`",
      219: "[",
      220: "\\",
      221: "]",
      222: "'"
    },

    shiftNums: {
      "`": "~",
      "1": "!",
      "2": "@",
      "3": "#",
      "4": "$",
      "5": "%",
      "6": "^",
      "7": "&",
      "8": "*",
      "9": "(",
      "0": ")",
      "-": "_",
      "=": "+",
      ";": ": ",
      "'": "\"",
      ",": "<",
      ".": ">",
      "/": "?",
      "\\": "|"
    },

    // excludes: button, checkbox, file, hidden, image, password, radio, reset, search, submit, url
    textAcceptingInputTypes: [
      "text", "password", "number", "email", "url", "range", "date", "month", "week", "time", "datetime",
      "datetime-local", "search", "color", "tel"],

    // default input types not to bind to unless bound directly
    textInputTypes: /textarea|input|select/i,

    options: {
      filterInputAcceptingElements: true,
      filterTextInputs: true,
      filterContentEditable: true
    }
  };

  function keyHandler(handleObj) {
    if (typeof handleObj.data === "string") {
      handleObj.data = {
        keys: handleObj.data
      };
    }

    // Only care when a possible input has been specified
    if (!handleObj.data || !handleObj.data.keys || typeof handleObj.data.keys !== "string") {
      return;
    }

    var origHandler = handleObj.handler,
      keys = handleObj.data.keys.toLowerCase().split(" ");

    handleObj.handler = function(event) {
      //      Don't fire in text-accepting inputs that we didn't directly bind to
      if (this !== event.target &&
        (jQuery.hotkeys.options.filterInputAcceptingElements &&
          jQuery.hotkeys.textInputTypes.test(event.target.nodeName) ||
          (jQuery.hotkeys.options.filterContentEditable && jQuery(event.target).attr('contenteditable')) ||
          (jQuery.hotkeys.options.filterTextInputs &&
            jQuery.inArray(event.target.type, jQuery.hotkeys.textAcceptingInputTypes) > -1))) {
        return;
      }

      var special = event.type !== "keypress" && jQuery.hotkeys.specialKeys[event.which],
        character = String.fromCharCode(event.which).toLowerCase(),
        modif = "",
        possible = {};

      jQuery.each(["alt", "ctrl", "shift"], function(index, specialKey) {

        if (event[specialKey + 'Key'] && special !== specialKey) {
          modif += specialKey + '+';
        }
      });

      // metaKey is triggered off ctrlKey erronously
      if (event.metaKey && !event.ctrlKey && special !== "meta") {
        modif += "meta+";
      }

      if (event.metaKey && special !== "meta" && modif.indexOf("alt+ctrl+shift+") > -1) {
        modif = modif.replace("alt+ctrl+shift+", "hyper+");
      }

      if (special) {
        possible[modif + special] = true;
      }
      else {
        possible[modif + character] = true;
        possible[modif + jQuery.hotkeys.shiftNums[character]] = true;

        // "$" can be triggered as "Shift+4" or "Shift+$" or just "$"
        if (modif === "shift+") {
          possible[jQuery.hotkeys.shiftNums[character]] = true;
        }
      }

      for (var i = 0, l = keys.length; i < l; i++) {
        if (possible[keys[i]]) {
          return origHandler.apply(this, arguments);
        }
      }
    };
  }

  jQuery.each(["keydown", "keyup", "keypress"], function() {
    jQuery.event.special[this] = {
      add: keyHandler
    };
  });

})(jQuery || this.jQuery || window.jQuery);

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/*!
  * Bootstrap v4.2.1 (https://getbootstrap.com/)
  * Copyright 2011-2018 The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
  */
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i.toggle(t)});else if(t!==Re){var e=t===Le?i.constructor.Event.MOUSEENTER:i.constructor.Event.FOCUSIN,n=t===Le?i.constructor.Event.MOUSELEAVE:i.constructor.Event.FOCUSOUT;g(i.element).on(e,i.config.selector,function(t){return i._enter(t)}).on(n,i.config.selector,function(t){return i._leave(t)})}}),g(this.element).closest(".modal").on("hide.bs.modal",function(){i.element&&i.hide()}),this.config.selector?this.config=l({},this.config,{trigger:"manual",selector:""}):this._fixTitle()},t._fixTitle=function(){var t=typeof this.element.getAttribute("data-original-title");(this.element.getAttribute("title")||"string"!==t)&&(this.element.setAttribute("data-original-title",this.element.getAttribute("title")||""),this.element.setAttribute("title",""))},t._enter=function(t,e){var n=this.constructor.DATA_KEY;(e=e||g(t.currentTarget).data(n))||(e=new this.constructor(t.currentTarget,this._getDelegateConfig()),g(t.currentTarget).data(n,e)),t&&(e._activeTrigger["focusin"===t.type?je:Le]=!0),g(e.getTipElement()).hasClass(Oe)||e._hoverState===De?e._hoverState=De:(clearTimeout(e._timeout),e._hoverState=De,e.config.delay&&e.config.delay.show?e._timeout=setTimeout(function(){e._hoverState===De&&e.show()},e.config.delay.show):e.show())},t._leave=function(t,e){var n=this.constructor.DATA_KEY;(e=e||g(t.currentTarget).data(n))||(e=new this.constructor(t.currentTarget,this._getDelegateConfig()),g(t.currentTarget).data(n,e)),t&&(e._activeTrigger["focusout"===t.type?je:Le]=!1),e._isWithActiveTrigger()||(clearTimeout(e._timeout),e._hoverState=we,e.config.delay&&e.config.delay.hide?e._timeout=setTimeout(function(){e._hoverState===we&&e.hide()},e.config.delay.hide):e.hide())},t._isWithActiveTrigger=function(){for(var t in this._activeTrigger)if(this._activeTrigger[t])return!0;return!1},t._getConfig=function(t){return"number"==typeof(t=l({},this.constructor.Default,g(this.element).data(),"object"==typeof t&&t?t:{})).delay&&(t.delay={show:t.delay,hide:t.delay}),"number"==typeof t.title&&(t.title=t.title.toString()),"number"==typeof t.content&&(t.content=t.content.toString()),_.typeCheckConfig(pe,t,this.constructor.DefaultType),t},t._getDelegateConfig=function(){var t={};if(this.config)for(var e in this.config)this.constructor.Default[e]!==this.config[e]&&(t[e]=this.config[e]);return t},t._cleanTipClass=function(){var t=g(this.getTipElement()),e=t.attr("class").match(Te);null!==e&&e.length&&t.removeClass(e.join(""))},t._handlePopperPlacementChange=function(t){var e=t.instance;this.tip=e.popper,this._cleanTipClass(),this.addAttachmentClass(this._getAttachment(t.placement))},t._fixTransition=function(){var t=this.getTipElement(),e=this.config.animation;null===t.getAttribute("x-placement")&&(g(t).removeClass(Ne),this.config.animation=!1,this.hide(),this.show(),this.config.animation=e)},i._jQueryInterface=function(n){return this.each(function(){var t=g(this).data(ve),e="object"==typeof n&&n;if((t||!/dispose|hide/.test(n))&&(t||(t=new i(this,e),g(this).data(ve,t)),"string"==typeof n)){if("undefined"==typeof t[n])throw new TypeError('No method named "'+n+'"');t[n]()}})},s(i,null,[{key:"VERSION",get:function(){return"4.2.1"}},{key:"Default",get:function(){return Ie}},{key:"NAME",get:function(){return pe}},{key:"DATA_KEY",get:function(){return ve}},{key:"Event",get:function(){return Ae}},{key:"EVENT_KEY",get:function(){return Ee}},{key:"DefaultType",get:function(){return Se}}]),i}();g.fn[pe]=Ue._jQueryInterface,g.fn[pe].Constructor=Ue,g.fn[pe].noConflict=function(){return g.fn[pe]=ye,Ue._jQueryInterface};var We="popover",xe="bs.popover",Fe="."+xe,qe=g.fn[We],Me="bs-popover",Ke=new RegExp("(^|\\s)"+Me+"\\S+","g"),Qe=l({},Ue.Default,{placement:"right",trigger:"click",content:"",template:'<div class="popover" role="tooltip"><div class="arrow"></div><h3 class="popover-header"></h3><div class="popover-body"></div></div>'}),Be=l({},Ue.DefaultType,{content:"(string|element|function)"}),Ve="fade",Ye="show",Xe=".popover-header",ze=".popover-body",Ge={HIDE:"hide"+Fe,HIDDEN:"hidden"+Fe,SHOW:"show"+Fe,SHOWN:"shown"+Fe,INSERTED:"inserted"+Fe,CLICK:"click"+Fe,FOCUSIN:"focusin"+Fe,FOCUSOUT:"focusout"+Fe,MOUSEENTER:"mouseenter"+Fe,MOUSELEAVE:"mouseleave"+Fe},Je=function(t){var e,n;function i(){return t.apply(this,arguments)||this}n=t,(e=i).prototype=Object.create(n.prototype),(e.prototype.constructor=e).__proto__=n;var o=i.prototype;return o.isWithContent=function(){return this.getTitle()||this._getContent()},o.addAttachmentClass=function(t){g(this.getTipElement()).addClass(Me+"-"+t)},o.getTipElement=function(){return this.tip=this.tip||g(this.config.template)[0],this.tip},o.setContent=function(){var t=g(this.getTipElement());this.setElementContent(t.find(Xe),this.getTitle());var e=this._getContent();"function"==typeof e&&(e=e.call(this.element)),this.setElementContent(t.find(ze),e),t.removeClass(Ve+" "+Ye)},o._getContent=function(){return this.element.getAttribute("data-content")||this.config.content},o._cleanTipClass=function(){var t=g(this.getTipElement()),e=t.attr("class").match(Ke);null!==e&&0<e.length&&t.removeClass(e.join(""))},i._jQueryInterface=function(n){return this.each(function(){var t=g(this).data(xe),e="object"==typeof n?n:null;if((t||!/dispose|hide/.test(n))&&(t||(t=new i(this,e),g(this).data(xe,t)),"string"==typeof n)){if("undefined"==typeof t[n])throw new TypeError('No method named "'+n+'"');t[n]()}})},s(i,null,[{key:"VERSION",get:function(){return"4.2.1"}},{key:"Default",get:function(){return Qe}},{key:"NAME",get:function(){return We}},{key:"DATA_KEY",get:function(){return xe}},{key:"Event",get:function(){return Ge}},{key:"EVENT_KEY",get:function(){return Fe}},{key:"DefaultType",get:function(){return Be}}]),i}(Ue);g.fn[We]=Je._jQueryInterface,g.fn[We].Constructor=Je,g.fn[We].noConflict=function(){return g.fn[We]=qe,Je._jQueryInterface};var Ze="scrollspy",$e="bs.scrollspy",tn="."+$e,en=g.fn[Ze],nn={offset:10,method:"auto",target:""},on={offset:"number",method:"string",target:"(string|element)"},rn={ACTIVATE:"activate"+tn,SCROLL:"scroll"+tn,LOAD_DATA_API:"load"+tn+".data-api"},sn="dropdown-item",an="active",ln='[data-spy="scroll"]',cn=".nav, .list-group",hn=".nav-link",un=".nav-item",fn=".list-group-item",dn=".dropdown",gn=".dropdown-item",_n=".dropdown-toggle",mn="offset",pn="position",vn=function(){function n(t,e){var n=this;this._element=t,this._scrollElement="BODY"===t.tagName?window:t,this._config=this._getConfig(e),this._selector=this._config.target+" "+hn+","+this._config.target+" "+fn+","+this._config.target+" "+gn,this._offsets=[],this._targets=[],this._activeTarget=null,this._scrollHeight=0,g(this._scrollElement).on(rn.SCROLL,function(t){return n._process(t)}),this.refresh(),this._process()}var t=n.prototype;return t.refresh=function(){var e=this,t=this._scrollElement===this._scrollElement.window?mn:pn,o="auto"===this._config.method?t:this._config.method,r=o===pn?this._getScrollTop():0;this._offsets=[],this._targets=[],this._scrollHeight=this._getScrollHeight(),[].slice.call(document.querySelectorAll(this._selector)).map(function(t){var e,n=_.getSelectorFromElement(t);if(n&&(e=document.querySelector(n)),e){var i=e.getBoundingClientRect();if(i.width||i.height)return[g(e)[o]().top+r,n]}return null}).filter(function(t){return t}).sort(function(t,e){return t[0]-e[0]}).forEach(function(t){e._offsets.push(t[0]),e._targets.push(t[1])})},t.dispose=function(){g.removeData(this._element,$e),g(this._scrollElement).off(tn),this._element=null,this._scrollElement=null,this._config=null,this._selector=null,this._offsets=null,this._targets=null,this._activeTarget=null,this._scrollHeight=null},t._getConfig=function(t){if("string"!=typeof(t=l({},nn,"object"==typeof t&&t?t:{})).target){var e=g(t.target).attr("id");e||(e=_.getUID(Ze),g(t.target).attr("id",e)),t.target="#"+e}return _.typeCheckConfig(Ze,t,on),t},t._getScrollTop=function(){return this._scrollElement===window?this._scrollElement.pageYOffset:this._scrollElement.scrollTop},t._getScrollHeight=function(){return this._scrollElement.scrollHeight||Math.max(document.body.scrollHeight,document.documentElement.scrollHeight)},t._getOffsetHeight=function(){return this._scrollElement===window?window.innerHeight:this._scrollElement.getBoundingClientRect().height},t._process=function(){var t=this._getScrollTop()+this._config.offset,e=this._getScrollHeight(),n=this._config.offset+e-this._getOffsetHeight();if(this._scrollHeight!==e&&this.refresh(),n<=t){var i=this._targets[this._targets.length-1];this._activeTarget!==i&&this._activate(i)}else{if(this._activeTarget&&t<this._offsets[0]&&0<this._offsets[0])return this._activeTarget=null,void this._clear();for(var o=this._offsets.length;o--;){this._activeTarget!==this._targets[o]&&t>=this._offsets[o]&&("undefined"==typeof this._offsets[o+1]||t<this._offsets[o+1])&&this._activate(this._targets[o])}}},t._activate=function(e){this._activeTarget=e,this._clear();var t=this._selector.split(",").map(function(t){return t+'[data-target="'+e+'"],'+t+'[href="'+e+'"]'}),n=g([].slice.call(document.querySelectorAll(t.join(","))));n.hasClass(sn)?(n.closest(dn).find(_n).addClass(an),n.addClass(an)):(n.addClass(an),n.parents(cn).prev(hn+", "+fn).addClass(an),n.parents(cn).prev(un).children(hn).addClass(an)),g(this._scrollElement).trigger(rn.ACTIVATE,{relatedTarget:e})},t._clear=function(){[].slice.call(document.querySelectorAll(this._selector)).filter(function(t){return t.classList.contains(an)}).forEach(function(t){return t.classList.remove(an)})},n._jQueryInterface=function(e){return this.each(function(){var t=g(this).data($e);if(t||(t=new n(this,"object"==typeof e&&e),g(this).data($e,t)),"string"==typeof e){if("undefined"==typeof t[e])throw new TypeError('No method named "'+e+'"');t[e]()}})},s(n,null,[{key:"VERSION",get:function(){return"4.2.1"}},{key:"Default",get:function(){return nn}}]),n}();g(window).on(rn.LOAD_DATA_API,function(){for(var t=[].slice.call(document.querySelectorAll(ln)),e=t.length;e--;){var n=g(t[e]);vn._jQueryInterface.call(n,n.data())}}),g.fn[Ze]=vn._jQueryInterface,g.fn[Ze].Constructor=vn,g.fn[Ze].noConflict=function(){return g.fn[Ze]=en,vn._jQueryInterface};var En="bs.tab",yn="."+En,Cn=g.fn.tab,Tn={HIDE:"hide"+yn,HIDDEN:"hidden"+yn,SHOW:"show"+yn,SHOWN:"shown"+yn,CLICK_DATA_API:"click"+yn+".data-api"},Sn="dropdown-menu",bn="active",In="disabled",Dn="fade",wn="show",An=".dropdown",Nn=".nav, .list-group",On=".active",kn="> li > .active",Pn='[data-toggle="tab"], [data-toggle="pill"], [data-toggle="list"]',Ln=".dropdown-toggle",jn="> .dropdown-menu .active",Hn=function(){function i(t){this._element=t}var t=i.prototype;return t.show=function(){var n=this;if(!(this._element.parentNode&&this._element.parentNode.nodeType===Node.ELEMENT_NODE&&g(this._element).hasClass(bn)||g(this._element).hasClass(In))){var t,i,e=g(this._element).closest(Nn)[0],o=_.getSelectorFromElement(this._element);if(e){var r="UL"===e.nodeName||"OL"===e.nodeName?kn:On;i=(i=g.makeArray(g(e).find(r)))[i.length-1]}var s=g.Event(Tn.HIDE,{relatedTarget:this._element}),a=g.Event(Tn.SHOW,{relatedTarget:i});if(i&&g(i).trigger(s),g(this._element).trigger(a),!a.isDefaultPrevented()&&!s.isDefaultPrevented()){o&&(t=document.querySelector(o)),this._activate(this._element,e);var l=function(){var t=g.Event(Tn.HIDDEN,{relatedTarget:n._element}),e=g.Event(Tn.SHOWN,{relatedTarget:i});g(i).trigger(t),g(n._element).trigger(e)};t?this._activate(t,t.parentNode,l):l()}}},t.dispose=function(){g.removeData(this._element,En),this._element=null},t._activate=function(t,e,n){var i=this,o=(!e||"UL"!==e.nodeName&&"OL"!==e.nodeName?g(e).children(On):g(e).find(kn))[0],r=n&&o&&g(o).hasClass(Dn),s=function(){return i._transitionComplete(t,o,n)};if(o&&r){var a=_.getTransitionDurationFromElement(o);g(o).removeClass(wn).one(_.TRANSITION_END,s).emulateTransitionEnd(a)}else s()},t._transitionComplete=function(t,e,n){if(e){g(e).removeClass(bn);var i=g(e.parentNode).find(jn)[0];i&&g(i).removeClass(bn),"tab"===e.getAttribute("role")&&e.setAttribute("aria-selected",!1)}if(g(t).addClass(bn),"tab"===t.getAttribute("role")&&t.setAttribute("aria-selected",!0),_.reflow(t),g(t).addClass(wn),t.parentNode&&g(t.parentNode).hasClass(Sn)){var o=g(t).closest(An)[0];if(o){var r=[].slice.call(o.querySelectorAll(Ln));g(r).addClass(bn)}t.setAttribute("aria-expanded",!0)}n&&n()},i._jQueryInterface=function(n){return this.each(function(){var t=g(this),e=t.data(En);if(e||(e=new i(this),t.data(En,e)),"string"==typeof n){if("undefined"==typeof e[n])throw new TypeError('No method named "'+n+'"');e[n]()}})},s(i,null,[{key:"VERSION",get:function(){return"4.2.1"}}]),i}();g(document).on(Tn.CLICK_DATA_API,Pn,function(t){t.preventDefault(),Hn._jQueryInterface.call(g(this),"show")}),g.fn.tab=Hn._jQueryInterface,g.fn.tab.Constructor=Hn,g.fn.tab.noConflict=function(){return g.fn.tab=Cn,Hn._jQueryInterface};var Rn="toast",Un="bs.toast",Wn="."+Un,xn=g.fn[Rn],Fn={CLICK_DISMISS:"click.dismiss"+Wn,HIDE:"hide"+Wn,HIDDEN:"hidden"+Wn,SHOW:"show"+Wn,SHOWN:"shown"+Wn},qn="fade",Mn="hide",Kn="show",Qn="showing",Bn={animation:"boolean",autohide:"boolean",delay:"number"},Vn={animation:!0,autohide:!0,delay:500},Yn='[data-dismiss="toast"]',Xn=function(){function i(t,e){this._element=t,this._config=this._getConfig(e),this._timeout=null,this._setListeners()}var t=i.prototype;return t.show=function(){var t=this;g(this._element).trigger(Fn.SHOW),this._config.animation&&this._element.classList.add(qn);var e=function(){t._element.classList.remove(Qn),t._element.classList.add(Kn),g(t._element).trigger(Fn.SHOWN),t._config.autohide&&t.hide()};if(this._element.classList.remove(Mn),this._element.classList.add(Qn),this._config.animation){var n=_.getTransitionDurationFromElement(this._element);g(this._element).one(_.TRANSITION_END,e).emulateTransitionEnd(n)}else e()},t.hide=function(t){var e=this;this._element.classList.contains(Kn)&&(g(this._element).trigger(Fn.HIDE),t?this._close():this._timeout=setTimeout(function(){e._close()},this._config.delay))},t.dispose=function(){clearTimeout(this._timeout),this._timeout=null,this._element.classList.contains(Kn)&&this._element.classList.remove(Kn),g(this._element).off(Fn.CLICK_DISMISS),g.removeData(this._element,Un),this._element=null,this._config=null},t._getConfig=function(t){return t=l({},Vn,g(this._element).data(),"object"==typeof t&&t?t:{}),_.typeCheckConfig(Rn,t,this.constructor.DefaultType),t},t._setListeners=function(){var t=this;g(this._element).on(Fn.CLICK_DISMISS,Yn,function(){return t.hide(!0)})},t._close=function(){var t=this,e=function(){t._element.classList.add(Mn),g(t._element).trigger(Fn.HIDDEN)};if(this._element.classList.remove(Kn),this._config.animation){var n=_.getTransitionDurationFromElement(this._element);g(this._element).one(_.TRANSITION_END,e).emulateTransitionEnd(n)}else e()},i._jQueryInterface=function(n){return this.each(function(){var t=g(this),e=t.data(Un);if(e||(e=new i(this,"object"==typeof n&&n),t.data(Un,e)),"string"==typeof n){if("undefined"==typeof e[n])throw new TypeError('No method named "'+n+'"');e[n](this)}})},s(i,null,[{key:"VERSION",get:function(){return"4.2.1"}},{key:"DefaultType",get:function(){return Bn}}]),i}();g.fn[Rn]=Xn._jQueryInterface,g.fn[Rn].Constructor=Xn,g.fn[Rn].noConflict=function(){return g.fn[Rn]=xn,Xn._jQueryInterface},function(){if("undefined"==typeof g)throw new TypeError("Bootstrap's JavaScript requires jQuery. jQuery must be included before Bootstrap's JavaScript.");var t=g.fn.jquery.split(" ")[0].split(".");if(t[0]<2&&t[1]<9||1===t[0]&&9===t[1]&&t[2]<1||4<=t[0])throw new Error("Bootstrap's JavaScript requires at least jQuery v1.9.1 but less than v4.0.0")}(),t.Util=_,t.Alert=p,t.Button=P,t.Carousel=lt,t.Collapse=bt,t.Dropdown=Zt,t.Modal=me,t.Popover=Je,t.Scrollspy=vn,t.Tab=Hn,t.Toast=Xn,t.Tooltip=Ue,Object.defineProperty(t,"__esModule",{value:!0})});
//# sourceMappingURL=bootstrap.min.js.map
/*
Copyright 2017 Ziadin Givan

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

https://github.com/givanz/FrontyJs
*/


// Simple JavaScript Templating
// John Resig - https://johnresig.com/ - MIT Licensed
(function(){
  var cache = {};
  
  this.tmpl = function tmpl(str, data){
    // Figure out if we're getting a template, or if we need to
    // load the template - and be sure to cache the result.
	var fn = /^[-a-zA-Z0-9]+$/.test(str) ?
      cache[str] = cache[str] ||
        tmpl(document.getElementById(str).innerHTML) :
              
      // Generate a reusable function that will serve as a template
      // generator (and which will be cached).
      new Function("obj",
        "var p=[],print=function(){p.push.apply(p,arguments);};" +
         
        // Introduce the data as local variables using with(){}
        "with(obj){p.push('" +
         
        // Convert the template into pure JavaScript
        str
          .replace(/[\r\t\n]/g, " ")
          .split("{%").join("\t")
          .replace(/((^|%})[^\t]*)'/g, "$1\r")
          .replace(/\t=(.*?)%}/g, "',$1,'")
          .split("\t").join("');")
          .split("%}").join("p.push('")
          .split("\r").join("\\'")
      + "');}return p.join('');");
    // Provide some basic currying to the user
    return data ? fn( data ) : fn;
  };
})();

var delay = (function(){
  var timer = 0;
  return function(callback, ms){
    clearTimeout (timer);
    timer = setTimeout(callback, ms);
  };
})();

function getStyle(el,styleProp)
{
	value = "";
	//var el = document.getElementById(el);
	if (el.style && el.style.length > 0 && el.style[styleProp])//check inline
		var value = el.style[styleProp];
	else
	if (el.currentStyle)	//check defined css
		var value = el.currentStyle[styleProp];
	else if (window.getComputedStyle)
	{
		var value = document.defaultView.getDefaultComputedStyle ? 
						document.defaultView.getDefaultComputedStyle(el,null).getPropertyValue(styleProp) : 
						window.getComputedStyle(el,null).getPropertyValue(styleProp);
	}
	
	return value;
}

function isElement(obj){
   return (typeof obj==="object") &&
      (obj.nodeType===1) && (typeof obj.style === "object") &&
      (typeof obj.ownerDocument ==="object")/* && obj.tagName != "BODY"*/;
}


var isIE11 = !!window.MSInputMethodContext && !!document.documentMode;

if (Fronty === undefined) var Fronty = {};

Fronty.defaultComponent = "_base";
Fronty.preservePropertySections = true;
Fronty.dragIcon = 'icon';//icon = use component icon when dragging | html = use component html to create draggable element

Fronty.baseUrl =  document.currentScript?document.currentScript.src.replace(/[^\/]*?\.js$/,''):'';

Fronty.ComponentsGroup = {};
Fronty.BlocksGroup = {};

Fronty.Components = {
	
	_components: {},
	
	_nodesLookup: {},
	
	_attributesLookup: {},

	_classesLookup: {},
	
	_classesRegexLookup: {},
	
	componentPropertiesElement: "#right-panel .component-properties",

	get: function(type) {
		return this._components[type];
	},

	add: function(type, data) {
		data.type = type;
		
		this._components[type] = data;
		
		if (data.nodes) 
		{
			for (var i in data.nodes)
			{	
				this._nodesLookup[ data.nodes[i] ] = data;
			}
		}
		
		if (data.attributes) 
		{
			if (data.attributes.constructor === Array)
			{
				for (var i in data.attributes)
				{	
					this._attributesLookup[ data.attributes[i] ] = data;
				}
			} else
			{
				for (var i in data.attributes)
				{	
					if (typeof this._attributesLookup[i] === 'undefined')
					{
						this._attributesLookup[i] = {};
					}

					if (typeof this._attributesLookup[i][ data.attributes[i] ] === 'undefined')
					{
						this._attributesLookup[i][ data.attributes[i] ] = {};
					}

					this._attributesLookup[i][ data.attributes[i] ] = data;
				}
			}
		}
		
		if (data.classes) 
		{
			for (var i in data.classes)
			{	
				this._classesLookup[ data.classes[i] ] = data;
			}
		}
		
		if (data.classesRegex) 
		{
			for (var i in data.classesRegex)
			{	
				this._classesRegexLookup[ data.classesRegex[i] ] = data;
			}
		}
	},
	
	extend: function(inheritType, type, data) {
		 
		 var newData = data;
		 
		 if (inheritData = this._components[inheritType])
		 {
			newData = $.extend(true,{}, inheritData, data);
			newData.properties = $.merge( $.merge([], inheritData.properties?inheritData.properties:[]), data.properties?data.properties:[]);
		 }
		 
		 //sort by order
		 newData.properties.sort(function (a,b) 
			{
				if (typeof a.sort  === "undefined") a.sort = 0;
				if (typeof b.sort  === "undefined") b.sort = 0;

				if (a.sort < b.sort)
					return -1;
				if (a.sort > b.sort)
					return 1;
				return 0;
			});
/*		 
		var output = array.reduce(function(o, cur) {

		  // Get the index of the key-value pair.
		  var occurs = o.reduce(function(n, item, i) {
			return (item.key === cur.key) ? i : n;
		  }, -1);

		  // If the name is found,
		  if (occurs >= 0) {

			// append the current value to its list of values.
			o[occurs].value = o[occurs].value.concat(cur.value);

		  // Otherwise,
		  } else {

			// add the current item to o (but make sure the value is an array).
			var obj = {name: cur.key, value: [cur.value]};
			o = o.concat([obj]);
		  }

		  return o;
		}, newData.properties);		 
*/
		
		this.add(type, newData);
	},
	
	
	matchNode: function(node) {
		var component = {};
		
		if (!node || !node.tagName) return false;
		
		if (node.attributes && node.attributes.length)
		{
			//search for attributes
			for (var i in node.attributes)
			{
				if (node.attributes[i])
				{
				attr = node.attributes[i].name;
				value = node.attributes[i].value;

				if (attr in this._attributesLookup) 
				{
					component = this._attributesLookup[ attr ];
					
					//currently we check that is not a component by looking at name attribute
					//if we have a collection of objects it means that attribute value must be checked
					if (typeof component["name"] === "undefined")
					{
						if (value in component)
						{
							return component[value];
						}
					} else 
					return component;
				}
			}
			}
				
			for (var i in node.attributes)
			{
				attr = node.attributes[i].name;
				value = node.attributes[i].value;
				
				//check for node classes
				if (attr == "class")
				{
					classes = value.split(" ");
					
					for (j in classes) 
					{
						if (classes[j] in this._classesLookup)
						return this._classesLookup[ classes[j] ];	
					}
					
					for (regex in this._classesRegexLookup) 
					{
						regexObj = new RegExp(regex);
						if (regexObj.exec(value)) 
						{
							return this._classesRegexLookup[ regex ];	
						}
					}
				}
			}
		}

		tagName = node.tagName.toLowerCase();
		if (tagName in this._nodesLookup) return this._nodesLookup[ tagName ];
	
		return false;
		//return false;
	},
	
	render: function(type) {

		var component = this._components[type];
		
		var rightPanel = jQuery(this.componentPropertiesElement);
		var section = rightPanel.find('.section[data-section="default"]');
		
		if (!(Fronty.preservePropertySections && section.length))
		{
			rightPanel.html('').append(tmpl("fronty-input-sectioninput", {key:"default", header:component.name}));
			section = rightPanel.find(".section");
		}

		rightPanel.find('[data-header="default"] span').html(component.name);
		section.html("")	
	
		if (component.beforeInit) component.beforeInit(Fronty.Builder.selectedEl.get(0));
		
		var element;
		
		var fn = function(component, property) {
			return property.input.on('propertyChange', function (event, value, input) {
					
					var element = Fronty.Builder.selectedEl;
					
					if (property.child) element = element.find(property.child);
					if (property.parent) element = element.parent(property.parent);
					
					if (property.onChange)
					{
						element = property.onChange(element, value, input, component);
					}/* else */
					if (property.htmlAttr)
					{
						oldValue = element.attr(property.htmlAttr);
						
						if (property.htmlAttr == "class" && property.validValues) 
						{
							element.removeClass(property.validValues.join(" "));
							element = element.addClass(value);
						}
						else if (property.htmlAttr == "style") 
						{
							element = element.css(property.key, value);
						}
						else
						{
							element = element.attr(property.htmlAttr, value);
						}
						
						Fronty.Undo.addMutation({type: 'attributes', 
												target: element.get(0), 
												attributeName: property.htmlAttr, 
												oldValue: oldValue, 
												newValue: element.attr(property.htmlAttr)});
					}

					if (component.onChange) 
					{
						element = component.onChange(element, property, value, input);
					}
					
					if (!property.child && !property.parent) Fronty.Builder.selectNode(element);
					
					return element;
			});				
		};			
	
		var nodeElement = Fronty.Builder.selectedEl;

		for (var i in component.properties)
		{
			var property = component.properties[i];
			var element = nodeElement;
			
			if (property.beforeInit) property.beforeInit(element.get(0)) 
			
			if (property.child) element = element.find(property.child);
			
			if (property.data) {
				property.data["key"] = property.key;
			} else
			{
				property.data = {"key" : property.key};
			}

			if (typeof property.group  === 'undefined') property.group = null;

			property.input = property.inputtype.init(property.data);
			
			if (property.init)
			{
				property.inputtype.setValue(property.init(element.get(0)));
			} else if (property.htmlAttr)
			{
				if (property.htmlAttr == "style")
				{
					//value = element.css(property.key);//jquery css returns computed style
					var value = getStyle(element.get(0), property.key);//getStyle returns declared style
				} else
				{
					var value = element.attr(property.htmlAttr);
				}

				//if attribute is class check if one of valid values is included as class to set the select
				if (value && property.htmlAttr == "class" && property.validValues)
				{
					value = value.split(" ").filter(function(el) {
						return property.validValues.indexOf(el) != -1
					});
				} 

				property.inputtype.setValue(value);
			}
			
			fn(component, property);

			if (property.inputtype == SectionInput)
			{
				section = rightPanel.find('.section[data-section="' + property.key + '"]');
				
				if (Fronty.preservePropertySections && section.length)
				{
					section.html("");
				} else 
				{
					rightPanel.append(property.input);
					section = rightPanel.find('.section[data-section="' + property.key + '"]');
				}
			}
			else
			{
				var row = $(tmpl('fronty-property', property)); 
				row.find('.input').append(property.input);
				section.append(row);
			}
			
			if (property.inputtype.afterInit)
			{
				property.inputtype.afterInit(property.input);
			}

		}
		
		if (component.init) component.init(Fronty.Builder.selectedEl.get(0));
	}
};	


Fronty.Blocks = {
	
	_blocks: {},

	get: function(type) {
		return this._blocks[type];
	},

	add: function(type, data) {
		data.type = type;
		this._blocks[type] = data;
	},
};	



Fronty.WysiwygEditor = {
	
	isActive: false,
	oldValue: '',
	doc:false,
	
	init: function(doc) {
		this.doc = doc;
		
		$("#bold-btn").on("click", function (e) {
				doc.execCommand('bold',false,null);
				e.preventDefault();
				return false;
		});

		$("#italic-btn").on("click", function (e) {
				doc.execCommand('italic',false,null);
				e.preventDefault();
				return false;
		});

		$("#underline-btn").on("click", function (e) {
				doc.execCommand('underline',false,null);
				e.preventDefault();
				return false;
		});
		
		$("#strike-btn").on("click", function (e) {
				doc.execCommand('strikeThrough',false,null);
				e.preventDefault();
				return false;
		});

		$("#link-btn").on("click", function (e) {
				doc.execCommand('createLink',false,"#");
				e.preventDefault();
				return false;
		});
	},
	
	undo: function(element) {
		this.doc.execCommand('undo',false,null);
	},

	redo: function(element) {
		this.doc.execCommand('redo',false,null);
	},
	
	edit: function(element) {
		element.attr({'contenteditable':true, 'spellcheckker':false});
		$("#wysiwyg-editor").show();

		this.element = element;
		this.isActive = true;
		this.oldValue = element.html();
	},

	destroy: function(element) {
		element.removeAttr('contenteditable spellcheckker');
		$("#wysiwyg-editor").hide();
		this.isActive = false;

	
		node = this.element.get(0);
		Fronty.Undo.addMutation({type:'characterData', 
								target: node, 
								oldValue: this.oldValue, 
								newValue: node.innerHTML});
	}
}
	
Fronty.Builder = {

	component : {},
	dragMoveMutation : false,
	isPreview : false,
	runJsOnSetHtml : false,
	designerMode : false,
	
	init: function(url, callback) {

		var self = this;
		
		self.loadControlGroups();
		self.loadBlockGroups();
		
		self.selectedEl = null;
		self.highlightEl = null;
		self.initCallback = callback;
		
        self.documentFrame = $("#iframe-wrapper > iframe");
        self.canvas = $("#canvas");

		self._loadIframe(url);
		
		self._initDragdrop();
		
		self._initBox();

		self.dragElement = null;
	},
	
/* controls */    	
	loadControlGroups : function() {	

		var componentsList = $(".components-list");
		componentsList.empty();
		var item = {}, component = {};
		
		componentsList.each(function ()
		{
			var list = $(this);
			var type = this.dataset.type;
			
			for (group in Fronty.ComponentsGroup)	
			{
				list.append('<li class="header clearfix" data-section="' + group + '"  data-search=""><label class="header" for="' + type + '_comphead_' + group + '">' + group + '  <div class="header-arrow"></div>\
									   </label><input class="header_check" type="checkbox" checked="true" id="' + type + '_comphead_' + group + '">  <ol></ol></li>');

				var componentsSubList = list.find('li[data-section="' + group + '"]  ol');
				
				components = Fronty.ComponentsGroup[ group ];
				
				for (i in components)
				{
					componentType = components[i];
					component = Fronty.Components.get(componentType);
					
					if (component)
					{
						item = $('<li data-section="' + group + '" data-drag-type=component data-type="' + componentType + '" data-search="' + component.name.toLowerCase() + '"><a href="#">' + component.name + "</a></li>");

						if (component.image) {

							item.css({
								backgroundImage: "url(" + '/assets/' + component.image + ")",
								backgroundRepeat: "no-repeat"
							})
						}
						
						componentsSubList.append(item)
					}
				}
			}
		});
	 },
	 
	loadBlockGroups : function() {	

		var blocksList = $(".blocks-list");
		blocksList.empty();
		var item = {};

		blocksList.each(function ()
		{

			var list = $(this);
			var type = this.dataset.type;

			for (group in Fronty.BlocksGroup)	
			{
				list.append('<li class="header" data-section="' + group + '"  data-search=""><label class="header" for="' + type + '_blockhead_' + group + '">' + group + '  <div class="header-arrow"></div>\
									   </label><input class="header_check" type="checkbox" checked="true" id="' + type + '_blockhead_' + group + '">  <ol></ol></li>');

				var blocksSubList = list.find('li[data-section="' + group + '"]  ol');
				blocks = Fronty.BlocksGroup[ group ];

				for (i in blocks)
				{
					blockType = blocks[i];
					block = Fronty.Blocks.get(blockType);
					
					if (block)
					{
						item = $('<li data-section="' + group + '" data-drag-type=block data-type="' + blockType + '" data-search="' + block.name.toLowerCase() + '"><a href="#">' + block.name + "</a></li>");

						if (block.image) {

							item.css({
								backgroundImage: "url(" + ((block.image.indexOf('//') == -1) ? '/assets/':'') + block.image + ")",
								backgroundRepeat: "no-repeat"
							})
						}
						
						blocksSubList.append(item)
					}
				}
			}
		});
	 },
	
	loadUrl : function(url, callback) {	
		jQuery("#select-box").hide();
		
		self.initCallback = callback;
		if (Fronty.Builder.iframe.src != url) Fronty.Builder.iframe.src = url;
	},
	
/* iframe */
	_loadIframe : function(url) {	

		var self = this;
		self.iframe = this.documentFrame.get(0);
		self.iframe.src = url;

	    return this.documentFrame.on("load", function() 
        {
				window.FrameWindow = self.iframe.contentWindow;
				window.FrameDocument = self.iframe.contentWindow.document;
				var addSectionBox = jQuery("#add-section-box"); 

				$(window.FrameWindow).on( "beforeunload", function(event) {
					if (Fronty.Undo.undoIndex <= 0)
					{
						var dialogText = "You have unsaved changes";
						event.returnValue = dialogText;
						return dialogText;
					}
				});
				
				jQuery(window.FrameWindow).on("scroll resize", function(event) {
				
						if (self.selectedEl)
						{
							var offset = self.selectedEl.offset();
							
							jQuery("#select-box").css(
								{"top": offset.top - self.frameDoc.scrollTop() , 
								 "left": offset.left - self.frameDoc.scrollLeft() , 
								 "width" : self.selectedEl.outerWidth(), 
								 "height": self.selectedEl.outerHeight(),
								 //"display": "block"
								 });			
								 
						}
						
						if (self.highlightEl)
						{
							var offset = self.highlightEl.offset();
							
							jQuery("#highlight-box").css(
								{"top": offset.top - self.frameDoc.scrollTop() , 
								 "left": offset.left - self.frameDoc.scrollLeft() , 
								 "width" : self.highlightEl.outerWidth(), 
								 "height": self.highlightEl.outerHeight(),
								 //"display": "block"
								 });		
								 
							
							addSectionBox.hide();
						}
						
				});
			
				Fronty.WysiwygEditor.init(window.FrameDocument);
				if (self.initCallback) self.initCallback();

                return self._frameLoaded();
        });		
        
	},	
    
    _frameLoaded : function() {
		
		var self = Fronty.Builder;
		
		self.frameDoc = $(window.FrameDocument);
		self.frameHtml = $(window.FrameDocument).find("html");
		self.frameBody = $(window.FrameDocument).find("body");
		self.frameHead = $(window.FrameDocument).find("head");
		
		//insert editor helpers like non editable areas
		self.frameHead.append('<link data-fronty-helpers href="' + Fronty.baseUrl + '../../css/frontyjs-editor-helpers.css" rel="stylesheet">');

		self._initHighlight();
    },	
    
    _getElementType: function(el) {
		
		//search for component attribute
		componentName = '';  
		   
		if (el.attributes)
		for (var j = 0; j < el.attributes.length; j++){
			
		  if (el.attributes[j].nodeName.indexOf('data-component') > -1)	
		  {
			componentName = el.attributes[j].nodeName.replace('data-component-', '');	
		  }
		}
		
		if (componentName != '') return componentName;

		return el.tagName;
	},
	
	loadNodeComponent:  function(node) {
		data = Fronty.Components.matchNode(node);
		var component;
		
		if (data) 
			component = data.type;
		else 
			component = Fronty.defaultComponent;
			
		Fronty.Components.render(component);

	},
	
	selectNode:  function(node) {
		var self = this;
		
		if (!node)
		{
			jQuery("#select-box").hide();
			return;
		}
		
		if (self.texteditEl && self.selectedEl.get(0) != node) 
		{
			Fronty.WysiwygEditor.destroy(self.texteditEl);
			jQuery("#select-box").removeClass("text-edit").find("#select-actions").show();
			self.texteditEl = null;
		}

		var target = jQuery(node);
		
		if (target)
		{
			self.selectedEl = target;

			try {
				var offset = target.offset();
					
				jQuery("#select-box").css(
					{"top": offset.top - self.frameDoc.scrollTop() , 
					 "left": offset.left - self.frameDoc.scrollLeft() , 
					 "width" : target.outerWidth(), 
					 "height": target.outerHeight(),
					 "display": "block",
					 });
			} catch(err) {
				console.log(err);
				return false;
			}
		}
			 
		jQuery("#highlight-name").html(this._getElementType(node));
		
	},

/* iframe highlight */    
    _initHighlight: function() {
		
		var self = Fronty.Builder;
		
		self.frameHtml.on("mousemove touchmove", function(event) {
			
			if (event.target && isElement(event.target) && event.originalEvent)
			{
				self.highlightEl = target = jQuery(event.target);
				var offset = target.offset();
				var height = target.outerHeight();
				var halfHeight = Math.max(height / 2, 50);
				var width = target.outerWidth();
				var halfWidth = Math.max(width / 2, 50);
				
				var x = (event.clientX || event.originalEvent.clientX);
				var y = (event.clientY || event.originalEvent.clientY);
				
				if (self.isDragging)
				{
					var parent = self.highlightEl;

					try {
						if (event.originalEvent)
						{
							if ((offset.top  < (y - halfHeight)) || (offset.left  < (x - halfWidth)))
							{
								 if (isIE11) 
									self.highlightEl.append(self.dragElement); 
								 else 
									self.dragElement.appendTo(parent);
							} else
							{
								if (isIE11) 
								 self.highlightEl.prepend(self.dragElement); 
								else 
									self.dragElement.prependTo(parent);
							};
							
							if (self.designerMode)
							{
								var parentOffset = self.dragElement.offsetParent().offset();

								self.dragElement.css({
									"position": "absolute",
									'left': x - (parentOffset.left - self.frameDoc.scrollLeft()), 
									'top': y - (parentOffset.top - self.frameDoc.scrollTop()),
									});
							}
						}
						
					} catch(err) {
						console.log(err);
						return false;
					}
					
					if (!self.designerMode && self.iconDrag) self.iconDrag.css({'left': x + 275/*left panel width*/, 'top':y - 30 });					
				}// else //uncomment else to disable parent highlighting when dragging
				{
					
					jQuery("#highlight-box").css(
						{"top": offset.top - self.frameDoc.scrollTop() , 
						 "left": offset.left - self.frameDoc.scrollLeft() , 
						 "width" : width, 
						 "height": height,
						  "display" : event.target.hasAttribute('contenteditable')?"none":"block",
						  "border":self.isDragging?"1px dashed aqua":"",//when dragging highlight parent with green
						 });
						 
					jQuery("#highlight-name").html(self._getElementType(event.target));
					if (self.isDragging) jQuery("#highlight-name").hide(); else jQuery("#highlight-name").show();//hide tag name when dragging
				}
			}	
			
		});
		
		self.frameHtml.on("mouseup touchend", function(event) {
			if (self.isDragging)
			{
				self.isDragging = false;
				if (self.iconDrag) self.iconDrag.remove();
				$("#component-clone").remove();
				
				if (self.component.dragHtml) //if dragHtml is set for dragging then set real component html
				{
					newElement = $(self.component.html);
					self.dragElement.replaceWith(newElement);
					self.dragElement = newElement;
				}
				if (self.component.afterDrop) self.dragElement = self.component.afterDrop(self.dragElement);
				
				self.dragElement.css("border", "");
				
				node = self.dragElement.get(0);
				self.selectNode(node);
				self.loadNodeComponent(node);

				if (self.dragMoveMutation === false)
				{
					Fronty.Undo.addMutation({type: 'childList', 
											target: node.parentNode, 
											addedNodes: [node], 
											nextSibling: node.nextSibling});
				} else
				{
					self.dragMoveMutation.newParent = node.parentNode;
					self.dragMoveMutation.newNextSibling = node.nextSibling;
					
					Fronty.Undo.addMutation(self.dragMoveMutation);
					self.dragMoveMutation = false;
				}
			}
		});

		self.frameHtml.on("dblclick", function(event) {
			
			if (Fronty.Builder.isPreview == false)
			{
				self.texteditEl = target = jQuery(event.target);

				Fronty.WysiwygEditor.edit(self.texteditEl);
				
				self.texteditEl.attr({'contenteditable':true, 'spellcheckker':false});
				
				self.texteditEl.on("blur keyup paste input", function(event) {

					jQuery("#select-box").css({
							"width" : self.texteditEl.outerWidth(), 
							"height": self.texteditEl.outerHeight()
						 });
				});		
				
				jQuery("#select-box").addClass("text-edit").find("#select-actions").hide();
				jQuery("#highlight-box").hide();
			}
		});
		
		
		self.frameHtml.on("click", function(event) {
			
			if (Fronty.Builder.isPreview == false)
			{
				if (event.target)
				{
					//if component properties is loaded in left panel tab instead of right panel show tab
					if ($(".component-properties-tab").is(":visible"))//if properites tab is enabled/visible 
						$('.component-properties-tab a').show().tab('show'); 
					
					self.selectNode(event.target);
					self.loadNodeComponent(event.target);
				}
				
				event.preventDefault();
				return false;
			}	
			
		});
		
	},
	
	_initBox: function() {
		var self = this;
		
		$("#drag-btn").on("mousedown", function(event) {
			jQuery("#select-box").hide();
			self.dragElement = self.selectedEl.css("position","");
			self.isDragging = true;
			
			node = self.dragElement.get(0);

			self.dragMoveMutation = {type: 'move', 
								target: node,
								oldParent: node.parentNode,
								oldNextSibling: node.nextSibling};
				
			//self.selectNode(false);
			event.preventDefault();
			return false;
		});
		
		$("#down-btn").on("click", function(event) {
			jQuery("#select-box").hide();

			node = self.selectedEl.get(0);
			oldParent = node.parentNode;
			oldNextSibling = node.nextSibling;

			next = self.selectedEl.next();
			
			if (next.length > 0)
			{
				next.after(self.selectedEl);
			} else
			{
				self.selectedEl.parent().after(self.selectedEl);
			}
			
			newParent = node.parentNode;
			newNextSibling = node.nextSibling;
			
			Fronty.Undo.addMutation({type: 'move', 
									target: node,
									oldParent: oldParent,
									newParent: newParent,
									oldNextSibling: oldNextSibling,
									newNextSibling: newNextSibling});

			event.preventDefault();
			return false;
		});
		
		$("#up-btn").on("click", function(event) {
			jQuery("#select-box").hide();

			node = self.selectedEl.get(0);
			oldParent = node.parentNode;
			oldNextSibling = node.nextSibling;

			next = self.selectedEl.prev();
			
			if (next.length > 0)
			{
				next.before(self.selectedEl);
			} else
			{
				self.selectedEl.parent().before(self.selectedEl);
			}

			newParent = node.parentNode;
			newNextSibling = node.nextSibling;
			
			Fronty.Undo.addMutation({type: 'move', 
									target: node,
									oldParent: oldParent,
									newParent: newParent,
									oldNextSibling: oldNextSibling,
									newNextSibling: newNextSibling});

			event.preventDefault();
			return false;
		});
		
		$("#clone-btn").on("click", function(event) {
			
			clone = self.selectedEl.clone();
			
			self.selectedEl.after(clone);
			
			self.selectedEl = clone.click();
			
			node = clone.get(0);
			Fronty.Undo.addMutation({type: 'childList', 
									target: node.parentNode, 
									addedNodes: [node],
									nextSibling: node.nextSibling});
			
			event.preventDefault();
			return false;
		});
		
		$("#parent-btn").on("click", function(event) {
			
			node = self.selectedEl.parent().get(0);
			
			self.selectNode(node);
			self.loadNodeComponent(node);
			
			event.preventDefault();
			return false;
		});

		$("#delete-btn").on("click", function(event) {
			jQuery("#select-box").hide();
			
			node = self.selectedEl.get(0);
		
			Fronty.Undo.addMutation({type: 'childList', 
									target: node.parentNode, 
									removedNodes: [node],
									nextSibling: node.nextSibling});

			self.selectedEl.remove();

			event.preventDefault();
			return false;
		});

		var addSectionBox = jQuery("#add-section-box");
		var addSectionElement = {};
		
		$("#add-section-btn").on("click", function(event) {
			
			addSectionElement = self.highlightEl; 

			var offset = jQuery(addSectionElement).offset();			
			
			addSectionBox.css(
				{"top": (offset.top - self.frameDoc.scrollTop()) + addSectionElement.outerHeight(), 
				 "left": (offset.left - self.frameDoc.scrollLeft()) + (addSectionElement.outerWidth() / 2) - (addSectionBox.outerWidth() / 2), 
				 "display": "block",
				 });
			
			event.preventDefault();
			return false;
		});
		
		$("#close-section-btn").on("click", function(event) {
			addSectionBox.hide();
		});
		
		function addSectionComponent(html, after = true) 
		{
			var node = $(html);
			
			if (after)
			{
				addSectionElement.after(node);
			} else
			{
				addSectionElement.append(node);
			}
			
			node = node.get(0);
			
			Fronty.Undo.addMutation({type: 'childList', 
									target: node.parentNode, 
									addedNodes: [node], 
									nextSibling: node.nextSibling});
		}
		
		$(".components-list li ol li", addSectionBox).on("click", function(event) {
			var html = Fronty.Components.get(this.dataset.type).html;

			addSectionComponent(html, (jQuery("[name='add-section-insert-mode']:checked").val() == "after"));

			addSectionBox.hide();
		});

		$(".blocks-list li ol li", addSectionBox).on("click", function(event) {
			var html = Fronty.Blocks.get(this.dataset.type).html;

			addSectionComponent(html, (jQuery("[name='add-section-insert-mode']:checked").val() == "after"));

			addSectionBox.hide();
		});
		
	},	

/* drag and drop */
	_initDragdrop : function() {

		var self = this;
		self.isDragging = false;	
		
		$('.drag-elements-sidepane ul > li > ol > li').on("mousedown touchstart", function(event) {
			
			$this = jQuery(this);
			
			$("#component-clone").remove();
			
			if ($this.data("drag-type") == "component")
				self.component = Fronty.Components.get($this.data("type"));
			else
				self.component = Fronty.Blocks.get($this.data("type"));
			
			if (self.component.dragHtml)
			{
				html = self.component.dragHtml;
			} else
			{
				html = self.component.html;
			}
			
			self.dragElement = $(html);
			self.dragElement.css("border", "1px dashed #4285f4");
			
			if (self.component.dragStart) self.dragElement = self.component.dragStart(self.dragElement);

			self.isDragging = true;
			if (Fronty.dragIcon == 'html')
			{
				self.iconDrag = $(html).attr("id", "dragElement-clone").css('position', 'absolute');
			}
			else if (self.designerMode == false)
			{
				self.iconDrag = $('<img src=""/>').attr({"id": "dragElement-clone", 'src': $this.css("background-image").replace(/^url\(['"](.+)['"]\)/, '$1')}).
				css({'z-index':100, 'position':'absolute', 'width':'64px', 'height':'64px', 'top': event.originalEvent.y, 'left': event.originalEvent.x});
			}
				
			$('body').append(self.iconDrag);
			
			event.preventDefault();
			return false;
		});
		
		$('body').on('mouseup touchend', function(event) {
			if (self.iconDrag && self.isDragging == true)
			{
				self.isDragging = false;
				$("#component-clone").remove();
				self.iconDrag.remove();
				if(self.dragElement){
					self.dragElement.remove();
				}
			}
		});
		
		$('body').on('mousemove touchmove', function(event) {
			if (self.iconDrag && self.isDragging == true)
			{
				var x = (event.clientX || event.originalEvent.clientX);
				var y = (event.clientY || event.originalEvent.clientY);

				self.iconDrag.css({'left': x - 60, 'top': y - 30});

				elementMouseIsOver = document.elementFromPoint(x - 60, y - 40);
				
				//if drag elements hovers over iframe switch to iframe mouseover handler	
				if (elementMouseIsOver && elementMouseIsOver.tagName == 'IFRAME')
				{
					self.frameBody.trigger("mousemove", event);
					event.stopPropagation();
					self.selectNode(false);
				}
			}
		});
		
		$('.drag-elements-sidepane ul > ol > li > li').on("mouseup touchend", function(event) {
			self.isDragging = false;
			$("#component-clone").remove();
		});
			
	},
	
	removeHelpers: function (html, keepHelperAttributes = false)
	{
		//tags like stylesheets or scripts 
		html = html.replace(/<.*?data-fronty-helpers.*?>/gi, "");
		//attributes
		if (!keepHelperAttributes)
		{
			html = html.replace(/\s*data-fronty-\w+(=["'].*?["'])?\s*/gi, "");
		}
		
		return html;
	},

	getHtml: function(keepHelperAttributes = true) 
	{
		var doc = window.FrameDocument;
		var hasDoctpe = (doc.doctype !== null);
		var html = "";
		
		if (hasDoctpe) html =
		"<!DOCTYPE "
         + doc.doctype.name
         + (doc.doctype.publicId ? ' PUBLIC "' + doc.doctype.publicId + '"' : '')
         + (!doc.doctype.publicId && doc.doctype.systemId ? ' SYSTEM' : '') 
         + (doc.doctype.systemId ? ' "' + doc.doctype.systemId + '"' : '')
         + ">\n";
          
         html +=  doc.documentElement.innerHTML + "\n</html>";
         
         return this.removeHelpers(html, keepHelperAttributes);
	},
	
	setHtml: function(html) 
	{
		//update only body to avoid breaking iframe css/js relative paths
		start = html.indexOf("<body");
        end = html.indexOf("</body");		

        if (start >= 0 && end >= 0) {
            body = html.slice(html.indexOf(">", start) + 1, end);
        } else {
            body = html
        }
        
        if (this.runJsOnSetHtml)
			self.frameBody.html(body);
		else
			window.FrameDocument.body.innerHTML = body;
        
		
		//below methods brake document relative css and js paths
		//return self.iframe.outerHTML = html;
		//return self.documentFrame.html(html);
		//return self.documentFrame.attr("srcdoc", html);
	},
	
	saveAjax: function(fileName, startTemplateUrl, callback)
	{
		var data = {};
		data["fileName"] = (fileName && fileName != "") ? fileName : Fronty.FileManager.getCurrentUrl();
		data["startTemplateUrl"] = startTemplateUrl;
		if (!startTemplateUrl || startTemplateUrl == null)
		{
			data["html"] = this.getHtml();
		}

		$.ajax({
			type: "POST",
			url: '/designer/save',//set your server side save script url
			data: data,
			cache: false,
			success: function (data) {
				
				if (callback) callback(data);
				
			},
			error: function (data) {
				alert(data.responseText);
			}
		});					
	},
	
	setDesignerMode: function(designerMode = false)
	{
		this.designerMode = designerMode;
	}

};

Fronty.CodeEditor = {
	
	isActive: false,
	oldValue: '',
	doc:false,
	
	init: function(doc) {
		$("#fronty-code-editor textarea").val(Fronty.Builder.getHtml());

		$("#fronty-code-editor textarea").keyup(function () 
		{
			delay(Fronty.Builder.setHtml(this.value), 1000);
		});

		//load code on document changes
		Fronty.Builder.frameBody.on("fronty.undo.add fronty.undo.restore", function (e) { Fronty.CodeEditor.setValue();});
		//load code when a new url is loaded
		Fronty.Builder.documentFrame.on("load", function (e) { Fronty.CodeEditor.setValue();});

		this.isActive = true;
	},

	setValue: function(value) {
		if (this.isActive)
		{
			$("#fronty-code-editor textarea").val(Fronty.Builder.getHtml());
		}
	},

	destroy: function(element) {
		//this.isActive = false;
	},

	toggle: function() {
		if (this.isActive != true)
		{
			this.isActive = true;
			return this.init();
		}
		this.isActive = false;
		this.destroy();
	}
}

Fronty.Gui = {
	
	init: function() {
		$("[data-fronty-action]").each(function () {
			on = "click";
			if (this.dataset.frontyOn) on = this.dataset.frontyOn;
			
			$(this).on(on, Fronty.Gui[this.dataset.frontyAction]);
			if (this.dataset.frontyShortcut)
			{
				$(document).bind('keydown', this.dataset.frontyShortcut, Fronty.Gui[this.dataset.frontyAction]);
				$(window.FrameDocument, window.FrameWindow).bind('keydown', this.dataset.frontyShortcut, Fronty.Gui[this.dataset.frontyAction]);
			}
		});
	},
	
	undo : function () {
		if (Fronty.WysiwygEditor.isActive) 
		{
			Fronty.WysiwygEditor.undo();
		} else
		{
			Fronty.Undo.undo();
		}
		Fronty.Builder.selectNode();
	},
	
	redo : function () {
		if (Fronty.WysiwygEditor.isActive) 
		{
			Fronty.WysiwygEditor.redo();
		} else
		{
			Fronty.Undo.redo();
		}
		Fronty.Builder.selectNode();
	},
	
	//show modal with html content
	save : function () {
		$('#textarea-modal textarea').val(Fronty.Builder.getHtml());
		$('#textarea-modal').modal();
	},
	
	//post html content through ajax to save to filesystem/db
	saveAjax : function () {
		
		var url = Fronty.FileManager.getCurrentUrl();
		
		return Fronty.Builder.saveAjax(url, null, function (data) {
			$('#message-modal').modal().find(".modal-body").html("File saved at: " + data);
		});		
	},
	
	download : function () {
		filename = /[^\/]+$/.exec(Fronty.Builder.iframe.src)[0];
		uriContent = "data:application/octet-stream,"  + encodeURIComponent(Fronty.Builder.getHtml());

		var link = document.createElement('a');
		if ('download' in link)
		{
			link.download = filename;
			link.href = uriContent;
			link.target = "_blank";
			
			document.body.appendChild(link);
			result = link.click();
			document.body.removeChild(link);
			link.remove();
			
		} else
		{
			location.href = uriContent;
		}
	},
	
	viewport : function () {
		$("#canvas").attr("class", this.dataset.view);
	},
	
	toggleEditor : function () {
		$("#fronty-builder").toggleClass("bottom-panel-expand");
		$("#toggleEditorJsExecute").toggle();
		Fronty.CodeEditor.toggle();
	},
	
	toggleEditorJsExecute : function () {
		Fronty.Builder.runJsOnSetHtml = this.checked;
	},
	
	preview : function () {
		(Fronty.Builder.isPreview == true)?Fronty.Builder.isPreview = false:Fronty.Builder.isPreview = true;
		$("#iframe-layer").toggle();
		$("#fronty-builder").toggleClass("preview");
	},
	
	fullscreen : function () {
		launchFullScreen(document); // the whole page
	},
	
	componentSearch : function () {
		searchText = this.value;
		
		$("#left-panel .components-list li ol li").each(function () {
			$this = $(this);
			
			$this.hide();
			if ($this.data("search").indexOf(searchText) > -1) $this.show();
		});
	},
	
	clearComponentSearch : function () {
		$(".component-search").val("").keyup();
	},
	
	blockSearch : function () {
		searchText = this.value;
		
		$("#left-panel .blocks-list li ol li").each(function () {
			$this = $(this);
			
			$this.hide();
			if ($this.data("search").indexOf(searchText) > -1) $this.show();
		});
	},
	
	clearBlockSearch : function () {
		$(".block-search").val("").keyup();
	},
	
	addBoxComponentSearch : function () {
		searchText = this.value;
		
		$("#add-section-box .components-list li ol li").each(function () {
			$this = $(this);
			
			$this.hide();
			if ($this.data("search").indexOf(searchText) > -1) $this.show();
		});
	},
	
	
	addBoxBlockSearch : function () {
		searchText = this.value;
		
		$("#add-section-box .blocks-list li ol li").each(function () {
			$this = $(this);
			
			$this.hide();
			if ($this.data("search").indexOf(searchText) > -1) $this.show();
		});
	},

//Pages, file/components tree 
	newPage : function () {
		
		var newPageModal = $('#new-page-modal');
		
		newPageModal.modal("show").find("form").off("submit").submit(function( event ) {

			var title = $("input[name=title]", newPageModal).val();
			var startTemplateUrl = $("select[name=startTemplateUrl]", newPageModal).val();
			var fileName = $("input[name=fileName]", newPageModal).val();
			
			//replace nonalphanumeric with dashes and lowercase for name
			var name = title.replace(/\W+/g, '-').toLowerCase();
				//allow only alphanumeric, dot char for extension (eg .html) and / to allow typing full path including folders
				fileName = fileName.replace(/[^A-Za-z0-9\.\/]+/g, '-').toLowerCase();
			
			//add your server url/prefix/path if needed
			var url = "" + fileName;
			

			Fronty.FileManager.addPage(name, title, url);
			event.preventDefault();

			return Fronty.Builder.saveAjax(url, startTemplateUrl, function (data) {
					Fronty.FileManager.loadPage(name);
					Fronty.FileManager.scrollBottom();
					newPageModal.modal("hide");
			});
		});
		
	},
	
	deletePage : function () {
		
	},

	setDesignerMode : function () {
		//aria-pressed attribute is updated after action is called and we check for false instead of true
		var designerMode = this.attributes["aria-pressed"].value != "true";
		Fronty.Builder.setDesignerMode(designerMode);
	},
	
}

Fronty.FileManager = {
	tree:false,
	pages:{},
	currentPage: false,
	
	init: function() {
		this.tree = $("#filemanager .tree > ol").html("");
		
		$(this.tree).on("click", "a", function (e) {
			e.preventDefault();
			return false;
		});
		
		$(this.tree).on("click", "li[data-page] label", function (e) {
			var page = $(this.parentNode).data("page");
			
			if (page) Fronty.FileManager.loadPage(page);
			return false;			
		})
		
		$(this.tree).on("click", "li[data-component] label ", function (e) {
			node = $(e.currentTarget.parentNode).data("node");
			
			Fronty.Builder.frameHtml.animate({
				scrollTop: $(node).offset().top
			}, 1000);

			Fronty.Builder.selectNode(node);
			Fronty.Builder.loadNodeComponent(node);
			
			//e.preventDefault();
			//return false;
		}).on("mouseenter", "li[data-component] label", function (e) {

			node = $(e.currentTarget).data("node");
			$(node).trigger("mousemove");
			
		});
	},
	
	addPage: function(name, title, url) {
		
		this.pages[name] = {title:title, url:url};
		
		this.tree.append(
			tmpl("fronty-filemanager-page-custom", {name:name, title:title, url:url}));
	},
	
	addPages: function(pages) {
		for (page in pages)
		{
			this.addPage(pages[page]['name'], pages[page]['title'], pages[page]['url']);
		}
	},
	
	addComponent: function(name, url, title, page) {
		$("[data-page='" + page + "'] > ol", this.tree).append(
			tmpl("fronty-filemanager-component", {name:name, url:url, title:title}));
	},
	
	getComponents: function() {

			var tree = [];
			function getNodeTree (node, parent) {
				if (node.hasChildNodes()) {
					for (var j = 0; j < node.childNodes.length; j++) {
						child = node.childNodes[j];
						
						if (child && child["attributes"] != undefined && 
							(matchChild = Fronty.Components.matchNode(child))) 
						{
							element = {
								name: matchChild.name,
								image: matchChild.image,
								type: matchChild.type,
								node: child,
								children: []
							};
							element.children = [];
							parent.push(element);
							element = getNodeTree(child, element.children);
						} else
						{
							element = getNodeTree(child, parent);	
						}
					}
				}

				return false;
			}
		
		getNodeTree(window.FrameDocument.body, tree);
		
		return tree;
	},
	
	loadComponents: function() {

		tree = this.getComponents();
		html = drawComponentsTree(tree);

		function drawComponentsTree(tree)
		{
			var html = $("<ol></ol>");
			j++;
			for (i in tree)
			{
				var node = tree[i];
				
				if (tree[i].children.length > 0) 
				{
					var li = $('<li data-component="' + node.name + '">\
					<label for="id' + j + '" style="background-image:url(/assets/' + node.image + ')"><span>' + node.name + '</span></label>\
					<input type="checkbox" id="id' + j + '">\
					</li>');		
					li.data("node", node.node);
					li.append(drawComponentsTree(node.children));
					html.append(li);
				}
				else 
				{
					var li =$('<li data-component="' + node.name + '" class="file">\
							<label for="id' + j + '" style="background-image:url(/assets/' + node.image + ')"><span>' + node.name + '</span></label>\
							<input type="checkbox" id="id' + j + '"></li>');
					li.data("node", node.node);							
					html.append(li);
				}
			}
			
			return html;
		}
		
		$("[data-page='" + this.currentPage + "'] > ol", this.tree).replaceWith(html);
	},
	
	getCurrentUrl: function() {
		if (this.currentPage)
		return this.pages[this.currentPage]['url'];
	},
	
	reloadCurrentPage: function() {
		if (this.currentPage)
		return this.loadPage(this.currentPage);
	},
	
	loadPage: function(name, disableCache = true) {
		$("[data-page]", this.tree).removeClass("active");
		$("[data-page='" + name + "']", this.tree).addClass("active");
		
		this.currentPage = name;
		var url = this.pages[name]['url'];
		
		Fronty.Builder.loadUrl(url + (disableCache ? (url.indexOf('?') > -1?'&':'?') + Math.random():''), 
			function () { 
				Fronty.FileManager.loadComponents(); 
			});
	},

	scrollBottom: function() {
		var scroll = this.tree.parent();	
		scroll.scrollTop(scroll.prop("scrollHeight"));	
	},
}

// Toggle fullscreen
function launchFullScreen(document) {
  if(document.documentElement.requestFullScreen) {
    
		if (document.FullScreenElement)
			document.exitFullScreen();
		else
			document.documentElement.requestFullScreen();
//mozilla		
  } else if(document.documentElement.mozRequestFullScreen) {

		if (document.mozFullScreenElement)
			document.mozCancelFullScreen();
		else
			document.documentElement.mozRequestFullScreen();
//webkit	  
  } else if(document.documentElement.webkitRequestFullScreen) {

		if (document.webkitFullscreenElement)
			document.webkitExitFullscreen();
		else
			document.documentElement.webkitRequestFullScreen();
//ie	  
  } else if(document.documentElement.msRequestFullscreen) {

		if (document.msFullScreenElement)
			document.msExitFullscreen();
		else
			document.documentElement.msRequestFullscreen();
  }
}

/*
Copyright 2017 Ziadin Givan

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

https://github.com/givanz/FrontyJs
*/

/*
https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver

childList 				Set to true if additions and removals of the target node's child elements (including text nodes) are to be observed.
attributes 				Set to true if mutations to target's attributes are to be observed.
characterData 			Set to true if mutations to target's data are to be observed.
subtree 				Set to true if mutations to target and target's descendants are to be observed.
attributeOldValue 		Set to true if attributes is set to true and target's attribute value before the mutation needs to be recorded.
characterDataOldValue 	Set to true if characterData is set to true and target's data before the mutation needs to be recorded.
attributeFilter 		Set to an array of attribute local names (without namespace) if not all attribute mutations need to be observed.
*/ 

/*
MutationRecord.type				 	String 		Returns "attributes" if the mutation was an attribute mutation,
												"characterData" if it was a mutation to a CharacterData node,
												and "childList" if it was a mutation to the tree of nodes.

MutationRecord.target 				Node 		Returns the node the mutation affected, depending on the MutationRecord.type.
												For attributes, it is the element whose attribute changed.
												For characterData, it is the CharacterData node.
												For childList, it is the node whose children changed.

MutationRecord.addedNodes 			NodeList 	Return the nodes added. Will be an empty NodeList if no nodes were added.
MutationRecord.removedNodes 		NodeList 	Return the nodes removed. Will be an empty NodeList if no nodes were removed.
MutationRecord.previousSibling 		Node 		Return the previous sibling of the added or removed nodes, or null.
MutationRecord.nextSibling 			Node 		Return the next sibling of the added or removed nodes, or null.
MutationRecord.attributeName 		String 		Returns the local name of the changed attribute, or null.
MutationRecord.attributeNamespace 	String 		Returns the namespace of the changed attribute, or null.
MutationRecord.oldValue 			String 		The return value depends on the MutationRecord.type.
												For attributes, it is the value of the changed attribute before the change.
												For characterData, it is the data of the changed node before the change.
												For childList, it is null.
*/
 
Fronty.Undo = {
	
	undos: [],
	mutations: [],
	undoIndex: -1,
	enabled:true,
	/*		
	init: function() {
	},
	*/	
	addMutation : function(mutation) {	
		/*
			this.mutations.push(mutation);
			this.undoIndex++;
		*/
		Fronty.Builder.frameBody.trigger("fronty.undo.add");
		this.mutations.splice(++this.undoIndex, 0, mutation);
	 },

	restore : function(mutation, undo) {	
		
		switch (mutation.type) {
			case 'childList':
			
				if (undo == true)
				{
					addedNodes = mutation.removedNodes;
					removedNodes = mutation.addedNodes;
				} else //redo
				{
					addedNodes = mutation.addedNodes;
					removedNodes = mutation.removedNodes;
				}
				
				if (addedNodes) for(i in addedNodes)
				{
					node = addedNodes[i];
					if (mutation.nextSibling)
					{ 
						mutation.nextSibling.parentNode.insertBefore(node, mutation.nextSibling);
					} else
					{
						mutation.target.append(node);
					}
				}

				if (removedNodes) for(i in removedNodes)
				{
					node = removedNodes[i];
					node.parentNode.removeChild(node);
				}
			break;					
			case 'move':
				if (undo == true)
				{
					parent = mutation.oldParent;
					sibling = mutation.oldNextSibling;
				} else //redo
				{
					parent = mutation.newParent;
					sibling = mutation.newNextSibling;
				}
			  
				if (sibling)
				{
					sibling.parentNode.insertBefore(mutation.target, sibling);
				} else
				{
					parent.append(node);
				}
			break;
			case 'characterData':
			  mutation.target.innerHTML = undo ? mutation.oldValue : mutation.newValue;
			  break;
			case 'attributes':
			  value = undo ? mutation.oldValue : mutation.newValue;

			  if (value || value === false || value === 0)
				mutation.target.setAttribute(mutation.attributeName, value);
			  else
				mutation.target.removeAttribute(mutation.attributeName);

			break;
		}
		
		Fronty.Builder.frameBody.trigger("fronty.undo.restore");
	 },
	 
	undo : function() {	
		if (this.undoIndex >= 0) {
		  this.restore(this.mutations[this.undoIndex--], true);
		}
	 },

	redo : function() {	
		if (this.undoIndex < this.mutations.length - 1) {
		  this.restore(this.mutations[++this.undoIndex], false);
		}
	},

	hasChanges : function() {	
		return this.mutations.length;
	},
};


/*
Copyright 2017 Ziadin Givan

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

https://github.com/givanz/FrontyJs
*/

var Input = {
	
	init: function(name) {
	},


	onChange: function(event, node) {
		
		if (event.data && event.data.element)
		{
			event.data.element.trigger('propertyChange', [this.value, this]);
		}
	},

	renderTemplate: function(name, data) {
		return tmpl("fronty-input-" + name, data);
	},

	setValue: function(value) {
		$('input', this.element).val(value);
	},
	
	render: function(name, data) {
		this.element = $(this.renderTemplate(name, data));
		
		//bind events
		if (this.events)
		for (var i in this.events)
		{
			ev = this.events[i][0];
			fun = this[ this.events[i][1] ];
			el = this.events[i][2];
		
			this.element.on(ev, el, {element: this.element, input:this}, fun);
		}

		return this.element;
	}
};

var TextInput = $.extend({}, Input, {

    events: [
        ["blur", "onChange", "input"],
	 ],
	
	init: function(data) {
		return this.render("textinput", data);
	},
  }
);

var CheckboxInput = $.extend({}, Input, {

	onChange: function(event, node) {
		
		if (event.data && event.data.element)
		{
			event.data.element.trigger('propertyChange', [this.checked, this]);
		}
	},

    events: [
        ["change", "onChange", "input"],
	 ],
	
	init: function(data) {
		return this.render("checkboxinput", data);
	},
  }
);

var SelectInput = $.extend({}, Input, {
	
    events: [
        ["change", "onChange", "select"],
	 ],
	

	setValue: function(value) {
		$('select', this.element).val(value);
	},
	
	init: function(data) {
		return this.render("select", data);
	},
	
  }
);


var LinkInput = $.extend({}, TextInput, {

    events: [
        ["change", "onChange", "input"],
	 ],
	
	init: function(data) {
		return this.render("textinput", data);
	},
  }
);

var RangeInput = $.extend({}, Input, {

    events: [
        ["change", "onChange", "input"],
	 ],
	
	init: function(data) {
		return this.render("rangeinput", data);
	},
  }
);

var NumberInput = $.extend({}, Input, {

    events: [
        ["change", "onChange", "input"],
	 ],
	
	init: function(data) {
		return this.render("numberinput", data);
	},
  }
);

var CssUnitInput = $.extend({}, Input, {

	number:0,
	unit:"px",

    events: [
        ["change", "onChange", "select"],
        ["change keyup mouseup", "onChange", "input"],
	 ],
		
	onChange: function(event) {
		
		if (event.data && event.data.element)
		{
			input = event.data.input;
			if (this.value != "") input[this.name] = this.value;// this.name = unit or number	
			if (input['unit'] == "") input['unit'] = "px";//if unit is not set use default px
			
			value = "";	
			if (input.unit == "auto")  
			{
				$(event.data.element).addClass("auto"); 
				value = input.unit;
			}
			else 
			{
				$(event.data.element).removeClass("auto"); 
				value = input.number + input.unit;
			}
			
			event.data.element.trigger('propertyChange', [value, this]);
		}
	},
	
	setValue: function(value) {
		this.number = parseInt(value);
		this.unit = value.replace(this.number, '');
		
		if (this.unit == "auto") $(this.element).addClass("auto");

		$('input', this.element).val(this.number);
		$('select', this.element).val(this.unit);
	},
	
	init: function(data) {
		return this.render("cssunitinput", data);
	},
  }
);

var ColorInput = $.extend({}, Input, {

	 //html5 color input only supports setting values as hex colors even if the picker returns only rgb
	 rgb2hex: function(rgb) {
		 
		 if (rgb)
		 {
		 rgb = rgb.match(/^rgba?[\s+]?\([\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?/i);
		 
		 return (rgb && rgb.length === 4) ? "#" +
		  ("0" + parseInt(rgb[1],10).toString(16)).slice(-2) +
		  ("0" + parseInt(rgb[2],10).toString(16)).slice(-2) +
		  ("0" + parseInt(rgb[3],10).toString(16)).slice(-2) : rgb;
		 }
	},

    events: [
        ["change", "onChange", "input"],
	 ],

	setValue: function(value) {
		$('input', this.element).val(this.rgb2hex(value));
	},
	
	init: function(data) {
		return this.render("colorinput", data);
	},
  }
);

var ImageInput = $.extend({}, Input, {

    events: [
        ["blur", "onChange", "input[type=text]"],
        ["change", "onUpload", "input[type=file]"],
	 ],

	setValue: function(value) {

		//don't set blob value to avoid slowing down the page		
		if (value.indexOf("data:image") == -1)
		{
				$('input[type="text"]', this.element).val(value);
		}
	},

	onUpload: function(event, node) {

		if (this.files && this.files[0]) {
            var reader = new FileReader();
            reader.onload = imageIsLoaded;
            reader.readAsDataURL(this.files[0]);
            //reader.readAsBinaryString(this.files[0]);
            file = this.files[0];
        }

		function imageIsLoaded(e) {
				
				image = e.target.result;
				
				event.data.element.trigger('propertyChange', [image, this]);
				
				//return;//remove this line to enable php upload

				var formData = new FormData();
				formData.append("file", file);
    
				$.ajax({
					type: "POST",
					url: 'upload.php',//set your server side upload script url
					data: formData,
					processData: false,
					contentType: false,
					success: function (data) {
						console.log("File uploaded at: ", data);
						
						//if image is succesfully uploaded set image url
						event.data.element.trigger('propertyChange', [data, this]);
						
						//update src input
						$('input[type="text"]', event.data.element).val(data);
					},
					error: function (data) {
						alert(data.responseText);
					}
				});		
		}
	},

	init: function(data) {
		return this.render("imageinput", data);
	},
  }
);

var FileUploadInput = $.extend({}, TextInput, {

    events: [
        ["blur", "onChange", "input"],
	 ],

	init: function(data) {
		return this.render("textinput", data);
	},
  }
);


var RadioInput = $.extend({}, Input, {

	onChange: function(event, node) {
		
		if (event.data && event.data.element)
		{
			event.data.element.trigger('propertyChange', [this.value, this]);
		}
	},

    events: [
        ["change", "onChange", "input"],
	 ],

	setValue: function(value) {
		$('input', this.element).removeAttr('checked');
		if (value)
		$("input[value=" + value + "]", this.element).attr("checked", "true").prop('checked', true);
	},
	
	init: function(data) {
		return this.render("radioinput", data);
	},
  }
);

var RadioButtonInput = $.extend({}, RadioInput, {

	setValue: function(value) {
		$('input', this.element).removeAttr('checked');
		$('btn', this.element).removeClass('active');
		if (value && value != "")
		{
			$("input[value=" + value + "]", this.element).attr("checked", "true").prop('checked', true).parent().button("toggle");
		}
	},

	init: function(data) {
		return this.render("radiobuttoninput", data);
	},
  }
);

var ToggleInput = $.extend({}, TextInput, {

	onChange: function(event, node) {
		if (event.data && event.data.element)
		{
			event.data.element.trigger('propertyChange', [this.checked?this.getAttribute("data-value-on"):this.getAttribute("data-value-off"), this]);
		}
	},

    events: [
        ["change", "onChange", "input"],
	 ],

	init: function(data) {
		return this.render("toggle", data);
	},
  }
);

var ValueTextInput = $.extend({}, TextInput, {

    events: [
        ["blur", "onChange", "input"],
	 ],
	
	init: function(data) {
		return this.render("textinput", data);
	},
  }
);

var GridLayoutInput = $.extend({}, TextInput, {

    events: [
        ["blur", "onChange", "input"],
	 ],
	
	init: function(data) {
		return this.render("textinput", data);
	},
  }
);

var ProductsInput = $.extend({}, TextInput, {

    events: [
        ["blur", "onChange", "input"],
	 ],
	
	init: function(data) {
		return this.render("textinput", data);
	},
  }
);


var GridInput = $.extend({}, Input, {
	

    events: [
        ["change", "onChange", "select" /*'select'*/],
        ["click", "onChange", "button" /*'select'*/],
	 ],
	

	setValue: function(value) {
		$('select', this.element).val(value);
	},
	
	init: function(data) {
		return this.render("grid", data);
	},
	
  }
);

var TextValueInput = $.extend({}, Input, {
	

    events: [
        ["blur", "onChange", "input"],
	    ["click", "onChange", "button" /*'select'*/],
	 ],
	
	init: function(data) {
		return this.render("textvalue", data);
	},
	
  }
);

var ButtonInput = $.extend({}, Input, {

    events: [
        ["click", "onChange", "button" /*'select'*/],
	 ],
	

	setValue: function(value) {
		$('button', this.element).val(value);
	},
	
	init: function(data) {
		return this.render("button", data);
	},
	
  }
);

var SectionInput = $.extend({}, Input, {

    events: [
        ["click", "onChange", "button" /*'select'*/],
	 ],
	

	setValue: function(value) {
		return false;
	},
	
	init: function(data) {
		return this.render("sectioninput", data);
	},
	
  }
);

var ListInput = $.extend({}, Input, {
	
    events: [
        ["change", "onChange", "select"],
	 ],
	

	setValue: function(value) {
		$('select', this.element).val(value);
	},
	
	init: function(data) {
		return this.render("listinput", data);
	},
	
  }
);



var AutocompleteInput = $.extend({}, Input, {

    events: [
        ["autocomplete.change", "onAutocompleteChange", "input"],
	 ],

	onAutocompleteChange: function(event, value, text) {
		
		if (event.data && event.data.element)
		{
			event.data.element.trigger('propertyChange', [value, this]);
		}
	},

	init: function(data) {
		
		this.element = this.render("textinput", data);
		
		$('input', this.element).autocomplete(data.url);//using default parameters
		
		return this.element;
	}
  }
);

var AutocompleteList = $.extend({}, Input, {

    events: [
        ["autocompletelist.change", "onAutocompleteChange", "input"],
	 ],

	onAutocompleteChange: function(event, value, text) {
		
		if (event.data && event.data.element)
		{
			event.data.element.trigger('propertyChange', [value, this]);
		}
	},

	setValue: function(value) {
		$('input', this.element).data("autocompleteList").setValue(value);
	},

	init: function(data) {
		
		this.element = this.render("textinput", data);
		
		$('input', this.element).autocompleteList(data);//using default parameters
		
		return this.element;
	}
  }
);

var PopoverInput = $.extend({}, Input, {
  onChange: function (event, node) {
    if (event.data && event.data.element) {
      let element = event.data.element,
        button = $("input[value='" + this.value + "']", element);

      element.trigger('propertyChange', [this.value, this]);

      // Set first element text
      $(element).find('>.btn:first-child').html('').append(button.next().clone());

    }
  },

  events: [
    ["change", "onChange", "input"]
  ],

  setValue: function (value) {
    $('input', this.element).removeAttr('checked');
    if (value) {

      let button = $("input[value='" + value + "']", this.element);
      button.attr("checked", "true").prop('checked', true);

      // Set first element text
      $(">.btn:first-child", this.element).html('').append(button.next().clone());

      // Update active class
      $("label", this.element).removeClass('active');
      button.parent().addClass('active');
    }
  },

  init: function (data) {
    return this.render("popoverinput", data);
  },
});

var RangeInputTest = $.extend({}, Input, {

  events: [
    ["change", "onChange", "input"],
  ],

  setValue: function (value) {
    $('span', this.element).text(value.toString().replace(/^\D+/g, ''));
    $('input', this.element).val(value.toString().replace(/^\D+/g, ''));
  },

  onChange(event, node) {
    let element = event.data.element;
    $('span', element).text(this.value.toString().replace(/^\D+/g, ''));
    element.trigger('propertyChange', ['font-size-' + this.value, this]);
  },

  init: function (data) {
    return this.render("rangeinputtest", data);
  },
});

function makeId(length) {
  let text = "";
  let possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

  for (let i = 0; i < length; i++)
    text += possible.charAt(Math.floor(Math.random() * possible.length));

  return text;
}


var EventTrackerInput = $.extend({}, TextInput, {

  onChange: function (event, node) {

    if (event.data && event.data.element) {
      let element = this,
        $textarea = $('textarea', event.data.element),
        $saveButton = $('button', event.data.element),
        $selectedElement = $(Fronty.Builder.selectedEl);

      $(event.data.element).trigger('propertyChange',
        [function () {
          let value = element.getAttribute("data-value-off");

          let $idInput = $('[data-section="element_header"]').find('[data-key="id"]').find('input');

          if (element.checked) {
            // Get value
            value = element.getAttribute("data-value-on");

            // Get or create id
            this.id = (!this.id) ? makeId(8) : this.id;

            // Update Id text field
            $idInput.next('input').val($idInput.val())
            $idInput.val(this.id);

            // Show textarea and save button
            $textarea.removeClass('d-none');
            $saveButton.removeClass('d-none');

            // If temporary removed row exist, restore it
            let temporaryRemoved = localStorage.getItem('_' + this.id);
            if (temporaryRemoved) {
              let eventCode = localStorage.getItem('_' + this.id);

              localStorage.removeItem('_' + this.id);
              localStorage.setItem(this.id, eventCode);
            }

            // Set eventCode in textarea
            $textarea.val(localStorage.getItem(this.id))
          } else {
            // Hide textarea and save button
            $textarea.addClass('d-none');
            $saveButton.addClass('d-none');

            // Get row from localStorage by element.id
            // and add prefix `_` to id (temporary removed)
            let id = $selectedElement.prop('id'),
              eventCode = localStorage.getItem(id);
            localStorage.removeItem(id);
            if (eventCode) {
              localStorage.setItem('_' + id, eventCode);
            }
          }
          return value
        },
          this
        ]
      );
    }
  },

  setValue: function (value) {
    let $toggle = $(this.element),
      $textarea = $('textarea', this.element),
      $saveButton = $('button', this.element),
      $selectedElement = $(Fronty.Builder.selectedEl);

    $saveButton.on('click', function () {
      localStorage.setItem($selectedElement.prop('id'), $textarea.val());
    });

    if (value === 'true') {
      // Get selected elements id
      let id = $selectedElement.prop('id');

      // Enable toggle button
      $toggle.find('input').prop('checked', true);

      // Show textarea and save button
      $textarea.removeClass('d-none');
      $saveButton.removeClass('d-none');

      // Set eventCode in textarea
      $textarea.val(localStorage.getItem(id))
    }
  },

  events: [
    ["change", "onChange", "input"],
  ],

  init: function (data) {
    return this.render("event-tracker", data);
  },
});

var ToggleInputUpdatingWithProp = $.extend({}, TextInput, {

    onChange: function (event, node) {
      if (event.data && event.data.element) {
        event.data.element.trigger('propertyChange', [this.checked ? this.getAttribute("data-value-on") : this.getAttribute("data-value-off"), this]);
      }
    },

    setValue: function (value) {
      if (value === 'on') {
        $(this.element).find('> input').prop('checked', true);
      }
    },

    events: [
      ["change", "onChange", "input"],
    ],

    init: function (data) {
      return this.render("toggle", data);
    },
  }
);

var TextInputId = $.extend({}, Input, {
    onChange: function (event, node) {
      if (event.data && event.data.element) {
        event.data.element.trigger('propertyChange', [function() {
          let $element = $(this),
              $input = $(event.data.element).find('input[type="text"]'),
              newId = $input.val(),
              oldId = $input.next('input').val();


          let temporaryId = '_' + oldId,
              temporaryCode = window.localStorage.getItem(temporaryId);

          if (temporaryCode) {
            window.localStorage.setItem('_' + newId, temporaryCode);
            window.localStorage.removeItem(temporaryId);
          } else {
            let code = window.localStorage.getItem(oldId);

            if (code) {
              window.localStorage.setItem(newId, code);
              window.localStorage.removeItem(oldId);
            }
          }

          $input.next('input').val(newId);
          $element.prop('id', $input.val());
          return value;
        }, this]);
      }
    },

    setValue: function (value) {
      if (value) {
        console.log($(this.element));
        $(this.element).find('> input[type="text"]').prop('value', value);
        $(this.element).find('> input[type="hidden"]').prop('value', value);
      }
    },

    events: [
      ["blur", "onChange", "input"],
    ],

    init: function (data) {
      return this.render("textinput-id", data);
    },
  }
);

bgcolorClasses = ["bg-primary", "bg-secondary", "bg-success", "bg-danger", "bg-warning", "bg-info", "bg-light", "bg-dark", "bg-white"]

bgcolorSelectOptions =
  [{
    value: "Default",
    text: ""
  }, {
    value: "bg-primary",
    text: "Primary"
  }, {
    value: "bg-secondary",
    text: "Secondary"
  }, {
    value: "bg-success",
    text: "Success"
  }, {
    value: "bg-danger",
    text: "Danger"
  }, {
    value: "bg-warning",
    text: "Warning"
  }, {
    value: "bg-info",
    text: "Info"
  }, {
    value: "bg-light",
    text: "Light"
  }, {
    value: "bg-dark",
    text: "Dark"
  }, {
    value: "bg-white",
    text: "White"
  }];

function changeNodeName(node, newNodeName) {
  var newNode;
  newNode = document.createElement(newNodeName);
  attributes = node.get(0).attributes;

  for (i = 0, len = attributes.length; i < len; i++) {
    newNode.setAttribute(attributes[i].nodeName, attributes[i].nodeValue);
  }

  $(newNode).append($(node).contents());
  $(node).replaceWith(newNode);

  return newNode;
}

Fronty.ComponentsGroup['Elements'] = [
  "html/container", "html/heading", "html/paragraph", "html/image", "html/button", "html/ul", "html/hr", "html/badge"
];
Fronty.ComponentsGroup['Element groups'] = [
  "html/navbar", "html/jumbotron", "html/gridrow", "html/card", "html/breadcrumbs", "html/buttongroup",
  "html/buttontoolbar", "html/alert", "html/listgroup", "html/progress", "html/pagination", "html/table"
];
Fronty.ComponentsGroup['Form elements'] = [
  "html/form", "html/button", "html/buttongroup", "html/buttontoolbar", "html/alert", "html/progress", "html/textinput",
  "html/textareainput", "html/selectinput", "html/fileinput", "html/checkbox", "html/radiobutton"
];


var base_sort = 100;//start sorting for base component from 100 to allow extended properties to be first

Fronty.Components.add("_base", {
  name: "Element",
  properties: [{
    key: "element_header",
    inputtype: SectionInput,
    name: false,
    sort: base_sort++,
    data: {header: "General", expanded: false},
  }, {
    name: "id",
    key: "id",
    htmlAttr: "id",
    sort: base_sort++,
    inline: true,
    col: 6,
    inputtype: TextInputId
  }, {
    name: "Class",
    key: "class",
    htmlAttr: "class",
    sort: base_sort++,
    inline: true,
    col: 6,
    inputtype: TextInput
  }, {
    name: "EventTracker",
    key: "event-tracker",
    htmlAttr: "data-trackable",
    inputtype: EventTrackerInput,
    sort: base_sort++,
    col: 12,
    inline: true,
    data: {
      on: 'true',
      off: 'false'
    }
  }]
});

Fronty.Components.extend("_base", "html/link", {
  nodes: ["a"],
  name: "Link",
  image: "icons/link.svg",
  properties: [{
    name: "Url",
    key: "href",
    htmlAttr: "href",
    inputtype: LinkInput
  }, {
    name: "Target",
    key: "target",
    htmlAttr: "target",
    inputtype: TextInput
  }]
});

Fronty.Components.extend("_base", "html/image", {
  nodes: ["img"],
  name: "Image",
  html: '<img src="/assets/icons/image.svg" height="128" width="128">',
  /*
  afterDrop: function (node)
{
  node.attr("src", '');
  return node;
},*/
  image: "icons/image.svg",
  properties: [{
    name: "Image",
    key: "src",
    htmlAttr: "src",
    inputtype: ImageInput
  }, {
    name: "Width",
    key: "width",
    htmlAttr: "width",
    inputtype: TextInput
  }, {
    name: "Height",
    key: "height",
    htmlAttr: "height",
    inputtype: TextInput
  }, {
    name: "Alt",
    key: "alt",
    htmlAttr: "alt",
    inputtype: TextInput
  }]
});

Fronty.Components.add("html/hr", {
  image: "icons/hr.svg",
  nodes: ["hr"],
  name: "Horizontal Rule",
  html: "<hr>"
});

Fronty.Components.extend("_base", "html/label", {
  name: "Label",
  nodes: ["label"],
  html: '<label for="">Label</label>',
  properties: [{
    name: "For id",
    htmlAttr: "for",
    key: "for",
    inputtype: TextInput
  }]
});

function generateFontSizeClasses(start, end) {
  let classesArr = [null];
  for (let i = start; i <= end; i++) {
    classesArr.push(`font-size-${i}`);
  }
  return classesArr
}

function generateFontSizeOptions(start, end) {
  let optionsArr = [{
    value: null,
    text: '-'
  }];
  for (let i = start; i <= end; i++) {
    optionsArr.push({
      value: `font-size-${i}`,
      text: i
    });
  }
  return optionsArr
}

//Typography
Fronty.Components.extend("_base", "_base", {
  properties: [
    {
      key: "typography_header",
      inputtype: SectionInput,
      name: false,
      sort: base_sort++,
      data: {header: "Typography", expanded: false},
    }, {
      name: "Font family",
      key: "font-family",
      htmlAttr: "style",
      sort: base_sort++,
      col: 6,
      inline: true,
      inputtype: SelectInput,
      data: {
        options: [{
          value: "",
          text: "Default"
        }, {
          value: "Arial, Helvetica, sans-serif",
          text: "Arial"
        }, {
          value: 'Lucida Sans Unicode", "Lucida Grande", sans-serif',
          text: 'Lucida Grande'
        }, {
          value: 'Palatino Linotype", "Book Antiqua", Palatino, serif',
          text: 'Palatino Linotype'
        }, {
          value: '"Times New Roman", Times, serif',
          text: 'Times New Roman'
        }, {
          value: "Georgia, serif",
          text: "Georgia, serif"
        }, {
          value: "Tahoma, Geneva, sans-serif",
          text: "Tahoma"
        }, {
          value: 'Comic Sans MS, cursive, sans-serif',
          text: 'Comic Sans'
        }, {
          value: 'Verdana, Geneva, sans-serif',
          text: 'Verdana'
        }, {
          value: 'Impact, Charcoal, sans-serif',
          text: 'Impact'
        }, {
          value: 'Arial Black, Gadget, sans-serif',
          text: 'Arial Black'
        }, {
          value: 'Trebuchet MS, Helvetica, sans-serif',
          text: 'Trebuchet'
        }, {
          value: 'Courier New", Courier, monospace',
          text: 'Courier New", Courier, monospace'
        }, {
          value: 'Brush Script MT, sans-serif',
          text: 'Brush Script'
        }]
      }
    }, {
    name: false,
    key: 'font-size',
    sort: base_sort++,
    htmlAttr: 'class',
    parent: "",
    inputtype: RangeInputTest,
    validValues: generateFontSizeClasses(8, 80),
    data: {
      max: 80,
      min: 8,
      step: 1,
      // options: generateFontSizeOptions(8, 80)
    }
  }, {
    name: false,
    key: "custom-text-decoration",
    htmlAttr: "class",
    sort: base_sort++,
    validValues: ["", "text-underline", "text-overline", "text-through"],
    inputtype: RadioButtonInput,
    data: {
      extraclass: "btn-group-sm btn-group-fullwidth",
      options: [{
        value: "",
        icon: "la la-close",
        title: "None",
        checked: true,
      }, {
        value: "text-underline",
        title: "Underline",
        icon: "la la-long-arrow-down",
        checked: false,
      }, {
        value: "text-overline",
        title: "Overline",
        icon: "la la-long-arrow-up",
        checked: false,
      }, {
        value: "text-through",
        title: "Through",
        icon: "la la-strikethrough",
        checked: false,
      }],
    },
  }]
});

// Margin
Fronty.Components.extend("_base", "_base", {
  properties: [{
    key: "custom-margins-all",
    inputtype: SectionInput,
    name: false,
    sort: base_sort++,
    data: {header: "Outer spacing (Margins)", expanded: false},
  }, {
    name: "Margin Top",
    key: "custom-margin-top",
    htmlAttr: "class",
    sort: base_sort++,
    col: 6,
    inline: true,
    validValues: ['', 'mt-0', 'mt-1', 'mt-2', 'mt-3', 'mt-4', 'mt-5', 'mt-auto'],
    inputtype: PopoverInput,
    data: {
      extraclass: "btn-group-vertical ml-2",
      options: [{
        value: "",
        text: "-"
      }, {
        value: "mt-auto",
        text: "Auto"
      }, {
        value: "mt-0",
        text: "0 (0px)"
      }, {
        value: "mt-1",
        text: "1 (4px)"
      }, {
        value: "mt-2",
        text: "2 (8px)"
      }, {
        value: "mt-3",
        text: "3 (16px)"
      }, {
        value: "mt-4",
        text: "4 (24px)"
      }, {
        value: "mt-5",
        text: "5 (48px)"
      }],
    },
  }, {
    name: "Margin Right",
    key: "custom-margin-right",
    htmlAttr: "class",
    sort: base_sort++,
    col: 6,
    inline: true,
    validValues: ['', 'mr-0', 'mr-1', 'mr-2', 'mr-3', 'mr-4', 'mr-5', 'mr-auto'],
    inputtype: PopoverInput,
    data: {
      extraclass: "btn-group-vertical ml-2",
      options: [{
        value: "",
        text: "-"
      }, {
        value: "mr-auto",
        text: "Auto"
      }, {
        value: "mr-0",
        text: "0 (0px)"
      }, {
        value: "mr-1",
        text: "1 (4px)"
      }, {
        value: "mr-2",
        text: "2 (8px)"
      }, {
        value: "mr-3",
        text: "3 (16px)"
      }, {
        value: "mr-4",
        text: "4 (24px)"
      }, {
        value: "mr-5",
        text: "5 (48px)"
      }],
    },
  }, {
    name: "Margin Bottom",
    key: "custom-margin-bottom",
    htmlAttr: "class",
    sort: base_sort++,
    col: 6,
    inline: true,
    validValues: ['', 'mb-0', 'mb-1', 'mb-2', 'mb-3', 'mb-4', 'mb-5', 'mb-auto'],
    inputtype: PopoverInput,
    data: {
      extraclass: "btn-group-vertical ml-2",
      options: [{
        value: "",
        text: "-"
      }, {
        value: "mb-auto",
        text: "Auto"
      }, {
        value: "mb-0",
        text: "0 (0px)"
      }, {
        value: "mb-1",
        text: "1 (4px)"
      }, {
        value: "mb-2",
        text: "2 (8px)"
      }, {
        value: "mb-3",
        text: "3 (16px)"
      }, {
        value: "mb-4",
        text: "4 (24px)"
      }, {
        value: "mb-5",
        text: "5 (48px)"
      }],
    },
  }, {
    name: "Margin Left",
    key: "custom-margin-left",
    htmlAttr: "class",
    sort: base_sort++,
    col: 6,
    inline: true,
    validValues: ['', 'ml-0', 'ml-1', 'ml-2', 'ml-3', 'ml-4', 'ml-5', 'ml-auto'],
    inputtype: PopoverInput,
    data: {
      extraclass: "btn-group-vertical ml-2",
      options: [{
        value: "",
        text: "-"
      }, {
        value: "ml-auto",
        text: "Auto"
      }, {
        value: "ml-0",
        text: "0 (0px)"
      }, {
        value: "ml-1",
        text: "1 (4px)"
      }, {
        value: "ml-2",
        text: "2 (8px)"
      }, {
        value: "ml-3",
        text: "3 (16px)"
      }, {
        value: "ml-4",
        text: "4 (24px)"
      }, {
        value: "ml-5",
        text: "5 (48px)"
      }],
    },
  }]
});

// Padding
Fronty.Components.extend("_base", "_base", {
  properties: [{
    key: "custom-padding-all",
    inputtype: SectionInput,
    name: false,
    sort: base_sort++,
    data: {header: "Inner spacing (Paddings)", expanded: false},
  }, {
    name: "Padding Top",
    key: "custom-padding-top",
    htmlAttr: "class",
    sort: base_sort++,
    col: 6,
    inline: true,
    validValues: ['', 'pt-0', 'pt-1', 'pt-2', 'pt-3', 'pt-4', 'pt-5', 'pt-auto'],
    inputtype: PopoverInput,
    data: {
      extraclass: "btn-group-vertical ml-2",
      options: [{
        value: "",
        text: "-"
      }, {
        value: "pt-auto",
        text: "Auto"
      }, {
        value: "pt-0",
        text: "0 (0px)"
      }, {
        value: "pt-1",
        text: "1 (4px)"
      }, {
        value: "pt-2",
        text: "2 (8px)"
      }, {
        value: "pt-3",
        text: "3 (16px)"
      }, {
        value: "pt-4",
        text: "4 (24px)"
      }, {
        value: "pt-5",
        text: "5 (48px)"
      }],
    },
  }, {
    name: "Padding Right",
    key: "custom-padding-right",
    htmlAttr: "class",
    sort: base_sort++,
    col: 6,
    inline: true,
    validValues: ['', 'pr-0', 'pr-1', 'pr-2', 'pr-3', 'pr-4', 'pr-5', 'pr-auto'],
    inputtype: PopoverInput,
    data: {
      extraclass: "btn-group-vertical ml-2",
      options: [{
        value: "",
        text: "-"
      }, {
        value: "pr-auto",
        text: "Auto"
      }, {
        value: "pr-0",
        text: "0 (0px)"
      }, {
        value: "pr-1",
        text: "1 (4px)"
      }, {
        value: "pr-2",
        text: "2 (8px)"
      }, {
        value: "pr-3",
        text: "3 (16px)"
      }, {
        value: "pr-4",
        text: "4 (24px)"
      }, {
        value: "pr-5",
        text: "5 (48px)"
      }],
    },
  }, {
    name: "Padding Bottom",
    key: "custom-padding-bottom",
    htmlAttr: "class",
    sort: base_sort++,
    col: 6,
    inline: true,
    validValues: ['', 'pb-0', 'pb-1', 'pb-2', 'pb-3', 'pb-4', 'pb-5', 'pb-auto'],
    inputtype: PopoverInput,
    data: {
      extraclass: "btn-group-vertical ml-2",
      options: [{
        value: "",
        text: "-"
      }, {
        value: "pb-auto",
        text: "Auto"
      }, {
        value: "pb-0",
        text: "0 (0px)"
      }, {
        value: "pb-1",
        text: "1 (4px)"
      }, {
        value: "pb-2",
        text: "2 (8px)"
      }, {
        value: "pb-3",
        text: "3 (16px)"
      }, {
        value: "pb-4",
        text: "4 (24px)"
      }, {
        value: "pb-5",
        text: "5 (48px)"
      }],
    },
  }, {
    name: "Padding Left",
    key: "custom-padding-left",
    htmlAttr: "class",
    sort: base_sort++,
    col: 6,
    inline: true,
    validValues: ['', 'pl-0', 'pl-1', 'pl-2', 'pl-3', 'pl-4', 'pl-5', 'pl-auto'],
    inputtype: PopoverInput,
    data: {
      extraclass: "btn-group-vertical ml-2",
      options: [{
        value: "",
        text: "-"
      }, {
        value: "pl-auto",
        text: "Auto"
      }, {
        value: "pl-0",
        text: "0 (0px)"
      }, {
        value: "pl-1",
        text: "1 (4px)"
      }, {
        value: "pl-2",
        text: "2 (8px)"
      }, {
        value: "pl-3",
        text: "3 (16px)"
      }, {
        value: "pl-4",
        text: "4 (24px)"
      }, {
        value: "pl-5",
        text: "5 (48px)"
      }],
    },
  }]
});

Fronty.Components.extend("_base", "html/container", {
  classes: ["container", "container-fluid"],
  image: "icons/container.svg",
  html: '<div class="container" style="min-height:150px;"><div class="m-5">Container</div></div>',
  name: "Container",
  properties: [
    {
      name: "Type",
      key: "type",
      htmlAttr: "class",
      inputtype: SelectInput,
      validValues: ["container", "container-fluid"],
      data: {
        options: [{
          value: "container",
          text: "Default"
        }, {
          value: "container-fluid",
          text: "Fluid"
        }]
      }
    },
    {
      name: "Background",
      key: "background",
      htmlAttr: "class",
      validValues: bgcolorClasses,
      inputtype: SelectInput,
      data: {
        options: bgcolorSelectOptions
      }
    },
    {
      name: "Background Color",
      key: "background-color",
      htmlAttr: "style",
      inputtype: ColorInput,
    },
    {
      name: "Text Color",
      key: "color",
      htmlAttr: "style",
      inputtype: ColorInput,
    }],
});


// CUSTOM COLORS
Fronty.Components.extend("_base", "_base", {
  properties: [{
    key: "colors-class",
    inputtype: SectionInput,
    name: false,
    sort: base_sort++,
    data: {header: "Colors", expanded: false}
  }, {
    name: 'Text Color',
    key: "colors-class",
    htmlAttr: "class",
    sort: base_sort++,
    col: 6,
    inline: false,
    inputtype: PopoverInput,
    validValues: ['', 'text-success', 'text-info', 'text-danger', 'text-warning', 'text-muted', 'text-secondary',
      'text-primary', 'text-white', 'text-dark', 'text-light', 'text-black'],
    data: {
      extraclass: "ml-2 color-picker",
      options: [{
        value: "",
        text: "",
        icon: "fas fa-times text-secondary"
      }, {
        value: "text-white",
        text: "",
        icon: "fas fa-circle text-white"
      }, {
        value: "text-light",
        text: "",
        icon: "fas fa-circle text-light"
      }, {
        value: "text-info",
        text: "",
        icon: "fas fa-circle text-info"
      }, {
        value: "text-secondary",
        text: "",
        icon: "fas fa-circle text-secondary"
      }, {
        value: "text-muted",
        text: "",
        icon: "fas fa-circle text-muted"
      }, {
        value: "text-warning",
        text: "",
        icon: "fas fa-circle text-warning"
      }, {
        value: "text-success",
        text: "",
        icon: "fas fa-circle text-success"
      }, {
        value: "text-primary",
        text: "",
        icon: "fas fa-circle text-primary"
      }, {
        value: "text-danger",
        text: "",
        icon: "fas fa-circle text-danger"
      }, {
        value: "text-dark",
        text: "",
        icon: "fas fa-circle text-dark"
      }, {
        value: "text-black",
        text: "",
        icon: "fas fa-circle text-black"
      }]
    }
  }, {
    name: 'Background Color',
    key: "colors-class",
    htmlAttr: "class",
    sort: base_sort++,
    col: 6,
    inline: false,
    inputtype: PopoverInput,
    validValues: ['', 'bg-success', 'bg-info', 'bg-danger', 'bg-warning', 'bg-secondary',
      'bg-primary', 'bg-white', 'bg-dark', 'bg-light', 'bg-black'],
    data: {
      extraclass: "ml-2 color-picker",
      options: [{
        value: "",
        text: "",
        icon: "fas fa-times text-secondary"
      }, {
        value: "bg-white",
        text: "",
        icon: "fas fa-circle text-white"
      }, {
        value: "bg-light",
        text: "",
        icon: "fas fa-circle text-light"
      }, {
        value: "bg-info",
        text: "",
        icon: "fas fa-circle text-info"
      }, {
        value: "bg-secondary",
        text: "",
        icon: "fas fa-circle text-secondary"
      }, {
        value: "bg-warning",
        text: "",
        icon: "fas fa-circle text-warning"
      }, {
        value: "bg-success",
        text: "",
        icon: "fas fa-circle text-success"
      }, {
        value: "bg-primary",
        text: "",
        icon: "fas fa-circle text-primary"
      }, {
        value: "bg-danger",
        text: "",
        icon: "fas fa-circle text-danger"
      }, {
        value: "bg-dark",
        text: "",
        icon: "fas fa-circle text-dark"
      }, {
        value: "bg-black",
        text: "",
        icon: "fas fa-circle text-black"
      }]
    }
  }]
});


// CUSTOM FONT-SIZE
// Fronty.Components.extend('_base', '_base', {
//   properties: [{
//     key: "custom-font-size-section",
//     inputtype: SectionInput,
//     name: false,
//     sort: base_sort++,
//     data: {header: "Font Size", expanded: false}
//   }, {
//     name: false,
//     key: 'font-size',
//     sort: base_sort++,
//     htmlAttr: 'class',
//     parent: "",
//     inputtype: RangeInputTest,
//     validValues: generateFontSizeClasses(8, 80),
//     data: {
//       max: 80,
//       min: 8,
//       step: 1,
//       // options: generateFontSizeOptions(8, 80)
//     }
//   }]
// });

// CUSTOM TEXT DECORATION
// Fronty.Components.extend("_base", "_base", {
//   properties: [{
//     key: "custom-text-decoration",
//     inputtype: SectionInput,
//     name: false,
//     sort: base_sort++,
//     data: {header: "Text Decoration", expanded: false},
//   }, {
//     name: false,
//     key: "custom-text-decoration",
//     htmlAttr: "class",
//     sort: base_sort++,
//     validValues: ["", "text-underline", "text-overline", "text-through"],
//     inputtype: RadioButtonInput,
//     data: {
//       extraclass: "btn-group-sm btn-group-fullwidth",
//       options: [{
//         value: "",
//         icon: "la la-close",
//         title: "None",
//         checked: true,
//       }, {
//         value: "text-underline",
//         title: "Underline",
//         icon: "la la-long-arrow-down",
//         checked: false,
//       }, {
//         value: "text-overline",
//         title: "Overline",
//         icon: "la la-long-arrow-up",
//         checked: false,
//       }, {
//         value: "text-through",
//         title: "Through",
//         icon: "la la-strikethrough",
//         checked: false,
//       }],
//     },
//   }]
// });

// CUSTOM ALIGNMENT
Fronty.Components.extend("_base", "_base", {
  properties: [{
    key: "custom-text-align-section",
    inputtype: SectionInput,
    name: false,
    sort: base_sort++,
    data: {header: "Alignment", expanded: false},
  }, {
    name: false,
    key: "custom-text-align",
    htmlAttr: "class",
    sort: base_sort++,
    validValues: ["", "text-left", "text-center", "text-right"],
    inputtype: RadioButtonInput,
    data: {
      extraclass: "btn-group-sm btn-group-fullwidth",
      options: [{
        value: "",
        icon: "la la-close",
        title: "None",
        checked: true,
      }, {
        value: "text-left",
        title: "text-left",
        icon: "la la-align-left",
        checked: false,
      }, {
        value: "text-center",
        title: "Center",
        icon: "la la-align-center",
        checked: false,
      }, {
        value: "text-right",
        title: "Right",
        icon: "la la-align-right",
        checked: false,
      }],
    },
  }]
});

Fronty.avoidWidowProperties = {
  name: "Avoid widow",
  key: "avoid-widow",
  inputtype: ToggleInputUpdatingWithProp,
  onChange: function (node, value) {
    let text = $(node).html().trim();

    text = (value === 'on')
      ? text.replace(/\s([^\s]*)$/, '&nbsp;$1')
      : text.replace(/&nbsp;/g, ' ');

    $(node).html(text);
    return node;
  },
  init: function (node) {
    let text = $(node).html().trim();
    if (text.includes('&nbsp;')) {
      return 'on';
    }
    return 'off';
  },
  data: {
    on: "on",
    off: "off"
  }
};


Fronty.Components.extend("_base", "html/paragraph", {
  nodes: ["p"],
  name: "Paragraph",
  image: "icons/paragraph.svg",
  html: '<p>Lorem ipsum</p>',
  properties: [
    Fronty.avoidWidowProperties,
    {
      name: "Text align",
      key: "text-align",
      htmlAttr: "class",
      validValues: ["", "text-left", "text-center", "text-right"],
      inputtype: RadioButtonInput,
      data: {
        extraclass: "btn-group-sm btn-group-fullwidth",
        options: [{
          value: "",
          icon: "la la-close",
          //text: "None",
          title: "None",
          checked: true,
        }, {
          value: "text-left",
          //text: "Left",
          title: "Left",
          icon: "la la-align-left",
          checked: false,
        }, {
          value: "text-center",
          //text: "Center",
          title: "Center",
          icon: "la la-align-center",
          checked: false,
        }, {
          value: "text-right",
          //text: "Right",
          title: "Right",
          icon: "la la-align-right",
          checked: false,
        }],
      },
    }]
});


Fronty.Components.extend("_base", "html/heading", {
  image: "icons/heading.svg",
  name: "Heading",
  nodes: ["h1", "h2", "h3", "h4", "h5", "h6"],
  html: "<h1>Heading</h1>",
  properties: [Fronty.avoidWidowProperties, {
    name: "Tag",
    key: "tag",
    inputtype: SelectInput,

    onChange: function (node, value) {
      return changeNodeName(node, "h" + value);
    },

    init: function (node) {
      var regex;
      regex = /H(\d)/.exec(node.nodeName);

      if (regex && regex[1]) {
        return regex[1]
      }
      return 1
    },

    data: {
      options: [{
        value: "1",
        text: "Heading 1"
      }, {
        value: "2",
        text: "Heading 2"
      }, {
        value: "3",
        text: "Heading 3"
      }, {
        value: "4",
        text: "Heading 4"
      }, {
        value: "5",
        text: "Heading 5"
      }, {
        value: "6",
        text: "Heading 6"
      }]
    },
  }, {
    name: "Size",
    key: "size",
    htmlAttr: "class",
    inputtype: SelectInput,
    validValues: ['', 'display-1', 'display-2', 'display-3', 'display-4'],
    data: {
      options: [{
        value: "",
        text: "-"
      }, {
        value: "display-1",
        text: "1"
      }, {
        value: "display-2",
        text: "2"
      }, {
        value: "display-3",
        text: "3"
      }, {
        value: "display-4",
        text: "4"
      }]
    }
  }]
});

Fronty.Components.extend("_base", "html/button", {
  classes: ["btn", "btn-link"],
  name: "Button",
  image: "icons/button.svg",
  html: '<button type="button" class="btn btn-primary">Primary</button>',
  properties: [{
    name: "Scroll to Element",
    key: "scroll-to",
    htmlAttr: "class",
    inputtype: ToggleInput,
    onChange: function (node, value) {
      return node;
    },
    validValues: ["scrollTo"],
    data: {
      on: "scrollTo",
      off: ""
    }
  }, {
    name: "Link To",
    key: "href",
    htmlAttr: "data-scroll",
    inputtype: LinkInput
  }, {
    name: "Type",
    key: "type",
    htmlAttr: "class",
    inputtype: SelectInput,
    validValues: ["btn-default", "btn-primary", "btn-info", "btn-success", "btn-warning", "btn-info", "btn-light", "btn-dark", "btn-outline-primary", "btn-outline-info", "btn-outline-success", "btn-outline-warning", "btn-outline-info", "btn-outline-light", "btn-outline-dark", "btn-link", "btn-danger"],
    data: {
      options: [{
        value: "btn-default",
        text: "Default"
      }, {
        value: "btn-primary",
        text: "Primary"
      }, {
        value: "btn btn-info",
        text: "Info"
      }, {
        value: "btn-success",
        text: "Success"
      }, {
        value: "btn-warning",
        text: "Warning"
      }, {
        value: "btn-danger",
        text: "Danger"
      }, {
        value: "btn-info",
        text: "Info"
      }, {
        value: "btn-light",
        text: "Light"
      }, {
        value: "btn-dark",
        text: "Dark"
      }, {
        value: "btn-outline-primary",
        text: "Primary outline"
      }, {
        value: "btn-outline-info",
        text: "Info outline"
      }, {
        value: "btn-outline-danger",
        text: "Danger outline"
      }, {
        value: "btn-outline-success",
        text: "Success outline"
      }, {
        value: "btn-outline-warning",
        text: "Warning outline"
      }, {
        value: "btn-outline-info",
        text: "Info outline"
      }, {
        value: "btn-outline-light",
        text: "Light outline"
      }, {
        value: "btn-outline-dark",
        text: "Dark outline"
      }, {
        value: "btn-link",
        text: "Link"
      }]
    }
  }, {
    name: "Size",
    key: "size",
    htmlAttr: "class",
    inputtype: SelectInput,
    validValues: ["btn-lg", "btn-sm"],
    data: {
      options: [{
        value: "",
        text: "Default"
      }, {
        value: "btn-lg",
        text: "Large"
      }, {
        value: "btn-sm",
        text: "Small"
      }]
    }
  }, {
    name: "Target",
    key: "target",
    htmlAttr: "target",
    inputtype: TextInput
  }, {
    name: "Disabled",
    key: "disabled",
    htmlAttr: "class",
    inputtype: ToggleInput,
    validValues: ["disabled"],
    data: {
      on: "disabled",
      off: ""
    }
  }, {
    name: "Rounded",
    key: "rounded",
    htmlAttr: "class",
    inputtype: SelectInput,
    validValues: ["", "rounded-0", "rounded", "rounded-circle", "rounded-circle-equal"],
    data: {
      options: [{
        value: "",
        text: "-"
      }, {
        value: "rounded-0",
        text: "Not Rounded"
      }, {
        value: "rounded",
        text: "Rounded"
      }, {
        value: "rounded-circle",
        text: "Rounded Circle"
      }, {
        value: "rounded-circle-equal",
        text: "Rounded Circle Equal"
      }]
    }
  }]
});

Fronty.Components.extend("_base", "html/buttongroup", {
  classes: ["btn-group"],
  name: "Button Group",
  image: "icons/button_group.svg",
  html: '<div class="btn-group" role="group" aria-label="Basic example"><button type="button" class="btn btn-secondary">Left</button><button type="button" class="btn btn-secondary">Middle</button> <button type="button" class="btn btn-secondary">Right</button></div>',
  properties: [{
    name: "Size",
    key: "size",
    htmlAttr: "class",
    inputtype: SelectInput,
    validValues: ["btn-group-lg", "btn-group-sm"],
    data: {
      options: [{
        value: "",
        text: "Default"
      }, {
        value: "btn-group-lg",
        text: "Large"
      }, {
        value: "btn-group-sm",
        text: "Small"
      }]
    }
  }, {
    name: "Alignment",
    key: "alignment",
    htmlAttr: "class",
    inputtype: SelectInput,
    validValues: ["btn-group", "btn-group-vertical"],
    data: {
      options: [{
        value: "",
        text: "Default"
      }, {
        value: "btn-group",
        text: "Horizontal"
      }, {
        value: "btn-group-vertical",
        text: "Vertical"
      }]
    }
  }]
});

Fronty.Components.extend("_base", "html/buttontoolbar", {
  classes: ["btn-toolbar"],
  name: "Button Toolbar",
  image: "icons/button_toolbar.svg",
  html: '<div class="btn-toolbar" role="toolbar" aria-label="Toolbar with button groups">\
		  <div class="btn-group mr-2" role="group" aria-label="First group">\
			<button type="button" class="btn btn-secondary">1</button>\
			<button type="button" class="btn btn-secondary">2</button>\
			<button type="button" class="btn btn-secondary">3</button>\
			<button type="button" class="btn btn-secondary">4</button>\
		  </div>\
		  <div class="btn-group mr-2" role="group" aria-label="Second group">\
			<button type="button" class="btn btn-secondary">5</button>\
			<button type="button" class="btn btn-secondary">6</button>\
			<button type="button" class="btn btn-secondary">7</button>\
		  </div>\
		  <div class="btn-group" role="group" aria-label="Third group">\
			<button type="button" class="btn btn-secondary">8</button>\
		  </div>\
		</div>'
});

Fronty.Components.extend("_base", "html/alert", {
  classes: ["alert"],
  name: "Alert",
  image: "icons/alert.svg",
  html: '<div class="alert alert-warning alert-dismissible fade show" role="alert">\
		  <button type="button" class="close" data-dismiss="alert" aria-label="Close">\
			<span aria-hidden="true">&times;</span>\
		  </button>\
		  <strong>Holy guacamole!</strong> You should check in on some of those fields below.\
		</div>',
  properties: [{
    name: "Type",
    key: "type",
    htmlAttr: "class",
    validValues: ["alert-primary", "alert-secondary", "alert-success", "alert-danger", "alert-warning", "alert-info", "alert-light", "alert-dark"],
    inputtype: SelectInput,
    data: {
      options: [{
        value: "alert-primary",
        text: "Default"
      }, {
        value: "alert-secondary",
        text: "Secondary"
      }, {
        value: "alert-success",
        text: "Success"
      }, {
        value: "alert-danger",
        text: "Danger"
      }, {
        value: "alert-warning",
        text: "Warning"
      }, {
        value: "alert-info",
        text: "Info"
      }, {
        value: "alert-light",
        text: "Light"
      }, {
        value: "alert-dark",
        text: "Dark"
      }]
    }
  }]
});

Fronty.Components.extend("_base", "html/badge", {
  classes: ["badge"],
  image: "icons/badge.svg",
  name: "Badge",
  html: '<span class="badge badge-primary">Primary badge</span>',
  properties: [{
    name: "Color",
    key: "color",
    htmlAttr: "class",
    validValues: ["badge-primary", "badge-secondary", "badge-success", "badge-danger", "badge-warning", "badge-info", "badge-light", "badge-dark"],
    inputtype: SelectInput,
    data: {
      options: [{
        value: "",
        text: "Default",
      }, {
        value: "badge-primary",
        text: "Primary",
      }, {
        value: "badge-secondary",
        text: "Secondary",
      }, {
        value: "badge-success",
        text: "Success",
      }, {
        value: "badge-warning",
        text: "Warning",
      }, {
        value: "badge-danger",
        text: "Danger",
      }, {
        value: "badge-info",
        text: "Info",
      }, {
        value: "badge-light",
        text: "Light",
      }, {
        value: "badge-dark",
        text: "Dark",
      }]
    }
  }]
});

Fronty.Components.extend("_base", "html/card", {
  classes: ["card"],
  image: "icons/panel.svg",
  name: "Card",
  html: '<div class="card">\
          <%= image_tag("icons/image.svg", size: "128", class: "card-img-top") %>\
		  <div class="card-body">\
			<h4 class="card-title">Card title</h4>\
			<p class="card-text">Some quick example text to build on the card title and make up the bulk of the card\'s content.</p>\
			<a href="#" class="btn btn-primary">Go somewhere</a>\
		  </div>\
		</div>'
});

Fronty.Components.extend("_base", "html/listgroup", {
  name: "List Group",
  image: "icons/list_group.svg",
  classes: ["list-group"],
  html: '<ul class="list-group">\n  <li class="list-group-item">\n    <span class="badge">14</span>\n    Cras justo odio\n  </li>\n  <li class="list-group-item">\n    <span class="badge">2</span>\n    Dapibus ac facilisis in\n  </li>\n  <li class="list-group-item">\n    <span class="badge">1</span>\n    Morbi leo risus\n  </li>\n</ul>'
});

Fronty.Components.extend("_base", "html/listitem", {
  name: "List Item",
  classes: ["list-group-item"],
  html: '<li class="list-group-item"><span class="badge">14</span> Cras justo odio</li>'
});

Fronty.Components.extend("_base", "html/breadcrumbs", {
  classes: ["breadcrumb"],
  name: "Breadcrumbs",
  image: "icons/breadcrumbs.svg",
  html: '<ol class="breadcrumb">\
		  <li class="breadcrumb-item active"><a href="#">Home</a></li>\
		  <li class="breadcrumb-item active"><a href="#">Library</a></li>\
		  <li class="breadcrumb-item active">Data 3</li>\
		</ol>'
});

Fronty.Components.extend('_base', 'html/ul', {
  name: "List",
  nodes: ["ul", "ol"],
  image: "icons/navbar.svg",
  html: "<ul><li>list item 1</li><li>list item 2</li></ul>",
  properties: [{
    name: "List Tag",
    key: "list-tag",
    inputtype: SelectInput,
    onChange: function (node, value) {
      return changeNodeName(node, value);
    },

    init: function (node) {
      let tag = node.nodeName;
      if (tag) {
        return tag.toLowerCase()
      }
      return 'ul'
    },

    data: {
      options: [{
        value: "ul",
        text: "List unordered"
      }, {
        value: "ol",
        text: "List ordered"
      }]
    },
  }, {
    name: "List Style",
    key: "list-style",
    htmlAttr: 'class',
    inputtype: SelectInput,
    validValues: ['', 'list-unstyled'],
    data: {
      options: [{
        value: "",
        text: "-"
      }, {
        value: "list-unstyled",
        text: "List unstyled"
      }]
    }
  }]
});

Fronty.Components.extend("_base", "html/breadcrumbitem", {
  classes: ["breadcrumb-item"],
  name: "Breadcrumb Item",
  html: '<li class="breadcrumb-item"><a href="#">Library</a></li>',
  properties: [{
    name: "Active",
    key: "active",
    htmlAttr: "class",
    validValues: ["", "active"],
    inputtype: ToggleInput,
    data: {
      on: "active",
      off: ""
    }
  }]
});

Fronty.Components.extend("_base", "html/pagination", {
  classes: ["pagination"],
  name: "Pagination",
  image: "icons/pagination.svg",
  html: '<nav aria-label="Page navigation example">\
	  <ul class="pagination">\
		<li class="page-item"><a class="page-link" href="#">Previous</a></li>\
		<li class="page-item"><a class="page-link" href="#">1</a></li>\
		<li class="page-item"><a class="page-link" href="#">2</a></li>\
		<li class="page-item"><a class="page-link" href="#">3</a></li>\
		<li class="page-item"><a class="page-link" href="#">Next</a></li>\
	  </ul>\
	</nav>',

  properties: [{
    name: "Size",
    key: "size",
    htmlAttr: "class",
    inputtype: SelectInput,
    validValues: ["btn-lg", "btn-sm"],
    data: {
      options: [{
        value: "",
        text: "Default"
      }, {
        value: "btn-lg",
        text: "Large"
      }, {
        value: "btn-sm",
        text: "Small"
      }]
    }
  }, {
    name: "Alignment",
    key: "alignment",
    htmlAttr: "class",
    inputtype: SelectInput,
    validValues: ["justify-content-center", "justify-content-end"],
    data: {
      options: [{
        value: "",
        text: "Default"
      }, {
        value: "justify-content-center",
        text: "Center"
      }, {
        value: "justify-content-end",
        text: "Right"
      }]
    }
  }]
});

Fronty.Components.extend("_base", "html/pageitem", {
  classes: ["page-item"],
  html: '<li class="page-item"><a class="page-link" href="#">1</a></li>',
  name: "Pagination Item",
  properties: [{
    name: "Link To",
    key: "href",
    htmlAttr: "href",
    child: ".page-link",
    inputtype: TextInput
  }, {
    name: "Disabled",
    key: "disabled",
    htmlAttr: "class",
    validValues: ["disabled"],
    inputtype: ToggleInput,
    data: {
      on: "disabled",
      off: ""
    }
  }]
});

Fronty.Components.extend("_base", "html/progress", {
  classes: ["progress"],
  name: "Progress Bar",
  image: "icons/progressbar.svg",
  html: '<div class="progress"><div class="progress-bar w-25"></div></div>',
  properties: [{
    name: "Background",
    key: "background",
    htmlAttr: "class",
    validValues: bgcolorClasses,
    inputtype: SelectInput,
    data: {
      options: bgcolorSelectOptions
    }
  },
    {
      name: "Progress",
      key: "background",
      child: ".progress-bar",
      htmlAttr: "class",
      validValues: ["", "w-25", "w-50", "w-75", "w-100"],
      inputtype: SelectInput,
      data: {
        options: [{
          value: "",
          text: "None"
        }, {
          value: "w-25",
          text: "25%"
        }, {
          value: "w-50",
          text: "50%"
        }, {
          value: "w-75",
          text: "75%"
        }, {
          value: "w-100",
          text: "100%"
        }]
      }
    },
    {
      name: "Progress background",
      key: "background",
      child: ".progress-bar",
      htmlAttr: "class",
      validValues: bgcolorClasses,
      inputtype: SelectInput,
      data: {
        options: bgcolorSelectOptions
      }
    }, {
      name: "Striped",
      key: "striped",
      child: ".progress-bar",
      htmlAttr: "class",
      validValues: ["", "progress-bar-striped"],
      inputtype: ToggleInput,
      data: {
        on: "progress-bar-striped",
        off: "",
      }
    }, {
      name: "Animated",
      key: "animated",
      child: ".progress-bar",
      htmlAttr: "class",
      validValues: ["", "progress-bar-animated"],
      inputtype: ToggleInput,
      data: {
        on: "progress-bar-animated",
        off: "",
      }
    }]
});

Fronty.Components.extend("_base", "html/jumbotron", {
  classes: ["jumbotron"],
  image: "icons/jumbotron.svg",
  name: "Jumbotron",
  html: '<div class="jumbotron">\
		  <h1 class="display-3">Hello, world!</h1>\
		  <p class="lead">This is a simple hero unit, a simple jumbotron-style component for calling extra attention to featured content or information.</p>\
		  <hr class="my-4">\
		  <p>It uses utility classes for typography and spacing to space content out within the larger container.</p>\
		  <p class="lead">\
			<a class="btn btn-primary btn-lg" href="#" role="button">Learn more</a>\
		  </p>\
		</div>'
});

Fronty.Components.extend("_base", "html/navbar", {
  classes: ["navbar"],
  image: "icons/navbar.svg",
  name: "Nav Bar",
  html: '<nav class="navbar navbar-expand-lg navbar-light bg-light">\
		  <a class="navbar-brand" href="#">Navbar</a>\
		  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">\
			<span class="navbar-toggler-icon"></span>\
		  </button>\
		\
		  <div class="collapse navbar-collapse" id="navbarSupportedContent">\
			<ul class="navbar-nav mr-auto">\
			  <li class="nav-item active">\
				<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>\
			  </li>\
			  <li class="nav-item">\
				<a class="nav-link" href="#">Link</a>\
			  </li>\
			  <li class="nav-item">\
				<a class="nav-link disabled" href="#">Disabled</a>\
			  </li>\
			</ul>\
			<form class="form-inline my-2 my-lg-0">\
			  <input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">\
			  <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>\
			</form>\
		  </div>\
		</nav>',

  properties: [{
    name: "Color theme",
    key: "color",
    htmlAttr: "class",
    validValues: ["navbar-light", "navbar-dark"],
    inputtype: SelectInput,
    data: {
      options: [{
        value: "",
        text: "Default"
      }, {
        value: "navbar-light",
        text: "Light"
      }, {
        value: "navbar-dark",
        text: "Dark"
      }]
    }
  }, {
    name: "Background color",
    key: "background",
    htmlAttr: "class",
    validValues: bgcolorClasses,
    inputtype: SelectInput,
    data: {
      options: bgcolorSelectOptions
    }
  }, {
    name: "Placement",
    key: "placement",
    htmlAttr: "class",
    validValues: ["fixed-top", "fixed-bottom", "sticky-top"],
    inputtype: SelectInput,
    data: {
      options: [{
        value: "",
        text: "Default"
      }, {
        value: "fixed-top",
        text: "Fixed Top"
      }, {
        value: "fixed-bottom",
        text: "Fixed Bottom"
      }, {
        value: "sticky-top",
        text: "Sticky top"
      }]
    }
  }]
});

Fronty.Components.extend("_base", "html/form", {
  nodes: ["form"],
  image: "icons/form.svg",
  name: "Form",
  html: '<form><div class="form-group"><label>Text</label><input type="text" class="form-control"></div></div></form>',
  properties: [{
    name: "Style",
    key: "style",
    htmlAttr: "class",
    validValues: ["", "form-search", "form-inline", "form-horizontal"],
    inputtype: SelectInput,
    data: {
      options: [{
        value: "",
        text: "Default"
      }, {
        value: "form-search",
        text: "Search"
      }, {
        value: "form-inline",
        text: "Inline"
      }, {
        value: "form-horizontal",
        text: "Horizontal"
      }]
    }
  }, {
    name: "Action",
    key: "action",
    htmlAttr: "action",
    inputtype: TextInput
  }, {
    name: "Method",
    key: "method",
    htmlAttr: "method",
    inputtype: TextInput
  }]
});

Fronty.Components.extend("_base", "html/textinput", {
  name: "Text Input",
  attributes: {"type": "text"},
  image: "icons/text_input.svg",
  html: '<div class="form-group"><label>Text</label><input type="text" class="form-control"></div></div>',
  properties: [{
    name: "Value",
    key: "value",
    htmlAttr: "value",
    inputtype: TextInput
  }, {
    name: "Placeholder",
    key: "placeholder",
    htmlAttr: "placeholder",
    inputtype: TextInput
  }]
});

Fronty.Components.extend("_base", "html/selectinput", {
  nodes: ["select"],
  name: "Select Input",
  image: "icons/select_input.svg",
  html: '<div class="form-group"><label>Choose an option </label><select class="form-control"><option value="value1">Text 1</option><option value="value2">Text 2</option><option value="value3">Text 3</option></select></div>',

  beforeInit: function (node) {
    properties = [];
    var i = 0;

    $(node).find('option').each(function () {

      data = {"value": this.value, "text": this.text};

      i++;
      properties.push({
        name: "Option " + i,
        key: "option" + i,
        //index: i - 1,
        optionNode: this,
        inputtype: TextValueInput,
        data: data,
        onChange: function (node, value, input) {

          option = $(this.optionNode);

          //if remove button is clicked remove option and render row properties
          if (input.nodeName == 'BUTTON') {
            option.remove();
            Fronty.Components.render("html/selectinput");
            return node;
          }

          if (input.name == "value") option.attr("value", value);
          else if (input.name == "text") option.text(value);

          return node;
        },
      });
    });

    //remove all option properties
    this.properties = this.properties.filter(function (item) {
      return item.key.indexOf("option") === -1;
    });

    //add remaining properties to generated column properties
    properties.push(this.properties[0]);

    this.properties = properties;
    return node;
  },

  properties: [{
    name: "Option",
    key: "option1",
    inputtype: TextValueInput
  }, {
    name: "Option",
    key: "option2",
    inputtype: TextValueInput
  }, {
    name: "",
    key: "addChild",
    inputtype: ButtonInput,
    data: {text: "Add option", icon: "la-plus"},
    onChange: function (node) {
      $(node).append('<option value="value">Text</option>');

      //render component properties again to include the new column inputs
      Fronty.Components.render("html/selectinput");

      return node;
    }
  }]
});

Fronty.Components.extend("_base", "html/textareainput", {
  name: "Text Area",
  image: "icons/text_area.svg",
  html: '<div class="form-group"><label>Your response:</label><textarea class="form-control"></textarea></div>'
});

Fronty.Components.extend("_base", "html/radiobutton", {
  name: "Radio Button",
  attributes: {"type": "radio"},
  image: "icons/radio.svg",
  html: '<label class="radio"><input type="radio"> Radio</label>',
  properties: [{
    name: "Name",
    key: "name",
    htmlAttr: "name",
    inputtype: TextInput
  }]
});

Fronty.Components.extend("_base", "html/checkbox", {
  name: "Checkbox",
  attributes: {"type": "checkbox"},
  image: "icons/checkbox.svg",
  html: '<label class="checkbox"><input type="checkbox"> Checkbox</label>',
  properties: [{
    name: "Name",
    key: "name",
    htmlAttr: "name",
    inputtype: TextInput
  }]
});

Fronty.Components.extend("_base", "html/fileinput", {
  name: "Input group",
  attributes: {"type": "file"},
  image: "icons/text_input.svg",
  html: '<div class="form-group">\
			  <input type="file" class="form-control">\
			</div>'
});

Fronty.Components.extend("_base", "html/table", {
  nodes: ["table"],
  classes: ["table"],
  image: "icons/table.svg",
  name: "Table",
  html: '<table class="table">\
		  <thead>\
			<tr>\
			  <th>#</th>\
			  <th>First Name</th>\
			  <th>Last Name</th>\
			  <th>Username</th>\
			</tr>\
		  </thead>\
		  <tbody>\
			<tr>\
			  <th scope="row">1</th>\
			  <td>Mark</td>\
			  <td>Otto</td>\
			  <td>@mdo</td>\
			</tr>\
			<tr>\
			  <th scope="row">2</th>\
			  <td>Jacob</td>\
			  <td>Thornton</td>\
			  <td>@fat</td>\
			</tr>\
			<tr>\
			  <th scope="row">3</th>\
			  <td>Larry</td>\
			  <td>the Bird</td>\
			  <td>@twitter</td>\
			</tr>\
		  </tbody>\
		</table>',
  properties: [
    {
      name: "Type",
      key: "type",
      htmlAttr: "class",
      validValues: ["table-primary", "table-secondary", "table-success", "table-danger", "table-warning", "table-info", "table-light", "table-dark", "table-white"],
      inputtype: SelectInput,
      data: {
        options: [{
          value: "Default",
          text: ""
        }, {
          value: "table-primary",
          text: "Primary"
        }, {
          value: "table-secondary",
          text: "Secondary"
        }, {
          value: "table-success",
          text: "Success"
        }, {
          value: "table-danger",
          text: "Danger"
        }, {
          value: "table-warning",
          text: "Warning"
        }, {
          value: "table-info",
          text: "Info"
        }, {
          value: "table-light",
          text: "Light"
        }, {
          value: "table-dark",
          text: "Dark"
        }, {
          value: "table-white",
          text: "White"
        }]
      }
    }, {
      name: "Responsive",
      key: "responsive",
      htmlAttr: "class",
      validValues: ["table-responsive"],
      inputtype: ToggleInput,
      data: {
        on: "table-responsive",
        off: ""
      }
    }, {
      name: "Small",
      key: "small",
      htmlAttr: "class",
      validValues: ["table-sm"],
      inputtype: ToggleInput,
      data: {
        on: "table-sm",
        off: ""
      }
    }, {
      name: "Hover",
      key: "hover",
      htmlAttr: "class",
      validValues: ["table-hover"],
      inputtype: ToggleInput,
      data: {
        on: "table-hover",
        off: ""
      }
    }, {
      name: "Bordered",
      key: "bordered",
      htmlAttr: "class",
      validValues: ["table-bordered"],
      inputtype: ToggleInput,
      data: {
        on: "table-bordered",
        off: ""
      }
    }, {
      name: "Striped",
      key: "striped",
      htmlAttr: "class",
      validValues: ["table-striped"],
      inputtype: ToggleInput,
      data: {
        on: "table-striped",
        off: ""
      }
    }, {
      name: "Inverse",
      key: "inverse",
      htmlAttr: "class",
      validValues: ["table-inverse"],
      inputtype: ToggleInput,
      data: {
        on: "table-inverse",
        off: ""
      }
    }, {
      name: "Head options",
      key: "head",
      htmlAttr: "class",
      child: "thead",
      inputtype: SelectInput,
      validValues: ["", "thead-inverse", "thead-default"],
      data: {
        options: [{
          value: "",
          text: "None"
        }, {
          value: "thead-default",
          text: "Default"
        }, {
          value: "thead-inverse",
          text: "Inverse"
        }]
      }
    }]
});


Fronty.Components.extend("_base", "_base", {
	 properties: [{
		key: "background_image_header",
		inputtype: SectionInput,
		name:false,
		sort: base_sort++,
		data: {header:"Background Image", expanded:false},
	 },{
        name: "Image",
        key: "Image",
        sort: base_sort++,
		//htmlAttr: "style",
        inputtype: ImageInput,

        init: function(node) {
			var image = $(node).css("background-image").replace(/^url\(['"]?(.+)['"]?\)/, '$1');
			return image;
        },

		onChange: function(node, value) {

			$(node).css('background-image', 'url(' + value + ')');

			return node;
		}

   	}, {
        name: "Repeat",
        key: "background-repeat",
        sort: base_sort++,
		htmlAttr: "style",
        inputtype: SelectInput,
        data: {
			options: [{
				value: "",
				text: "Default"
			}, {
				value: "repeat-x",
				text: "repeat-x"
			}, {
				value: "repeat-y",
				text: "repeat-y"
			}, {
				value: "no-repeat",
				text: "no-repeat"
			}],
		}
   	}, {
        name: "Size",
        key: "background-size",
        sort: base_sort++,
		htmlAttr: "style",
        inputtype: SelectInput,
        data: {
			options: [{
				value: "",
				text: "Default"
			}, {
				value: "contain",
				text: "contain"
			}, {
				value: "cover",
				text: "cover"
			}],
		}
   	}, {
        name: "Position x",
        key: "background-position-x",
        sort: base_sort++,
		htmlAttr: "style",
        col:6,
		inline:true,
		inputtype: SelectInput,
        data: {
			options: [{
				value: "",
				text: "Default"
			}, {
				value: "center",
				text: "center"
			}, {
				value: "right",
				text: "right"
			}, {
				value: "left",
				text: "left"
			}],
		}
   	}, {
        name: "Position y",
        key: "background-position-y",
        sort: base_sort++,
		htmlAttr: "style",
        col:6,
		inline:true,
		inputtype: SelectInput,
        data: {
			options: [{
				value: "",
				text: "Default"
			}, {
				value: "center",
				text: "center"
			}, {
				value: "top",
				text: "top"
			}, {
				value: "bottom",
				text: "bottom"
			}],
		}
    }]
});


Fronty.Components.extend("_base", "html/tablerow", {
  nodes: ["tr"],
  name: "Table Row",
  html: "<tr><td>Cell 1</td><td>Cell 2</td><td>Cell 3</td></tr>",
  properties: [{
    name: "Type",
    key: "type",
    htmlAttr: "class",
    inputtype: SelectInput,
    validValues: ["", "success", "danger", "warning", "active"],
    data: {
      options: [{
        value: "",
        text: "Default"
      }, {
        value: "success",
        text: "Success"
      }, {
        value: "error",
        text: "Error"
      }, {
        value: "warning",
        text: "Warning"
      }, {
        value: "active",
        text: "Active"
      }]
    }
  }]
});

Fronty.Components.extend("_base", "html/tablecell", {
  nodes: ["td"],
  name: "Table Cell",
  html: "<td>Cell</td>"
});

Fronty.Components.extend("_base", "html/tableheadercell", {
  nodes: ["th"],
  name: "Table Header Cell",
  html: "<th>Head</th>"
});

Fronty.Components.extend("_base", "html/tablehead", {
  nodes: ["thead"],
  name: "Table Head",
  html: "<thead><tr><th>Head 1</th><th>Head 2</th><th>Head 3</th></tr></thead>",
  properties: [{
    name: "Type",
    key: "type",
    htmlAttr: "class",
    inputtype: SelectInput,
    validValues: ["", "success", "danger", "warning", "info"],
    data: {
      options: [{
        value: "",
        text: "Default"
      }, {
        value: "success",
        text: "Success"
      }, {
        value: "anger",
        text: "Error"
      }, {
        value: "warning",
        text: "Warning"
      }, {
        value: "info",
        text: "Info"
      }]
    }
  }]
});

Fronty.Components.extend("_base", "html/tablebody", {
  nodes: ["tbody"],
  name: "Table Body",
  html: "<tbody><tr><td>Cell 1</td><td>Cell 2</td><td>Cell 3</td></tr></tbody>"
});

Fronty.Components.add("html/gridcolumn", {
  name: "Grid Column",
  image: "icons/grid_row.svg",
  classesRegex: ["col-"],
  html: '<div class="col-sm-4"><h3>col-sm-4</h3></div>',
  properties: [{
    name: "Column",
    key: "column",
    inputtype: GridInput,
    data: {hide_remove: true},

    beforeInit: function (node) {
      _class = $(node).attr("class");

      var reg = /col-([^-\$ ]*)?-?(\d+)/g;
      var match;

      while ((match = reg.exec(_class)) != null) {
        this.data["col" + ((match[1] != undefined) ? "_" + match[1] : "")] = match[2];
      }
    },

    onChange: function (node, value, input) {
      _class = node.attr("class");

      //remove previous breakpoint column size
      _class = _class.replace(new RegExp(input.name + '-\\d+?'), '');
      //add new column size
      if (value) _class += ' ' + input.name + '-' + value;
      node.attr("class", _class);

      return node;
    },
  }]
});

Fronty.Components.extend("_base", "html/gridrow", {
  name: "Grid Row",
  image: "icons/grid_row.svg",
  classes: ["row"],
  html: '<div class="row"></div>',
  properties: [{
    name: "No Gutters",
    key: "no-gutters",
    htmlAttr: "class",
    validValues: ["no-gutters"],
    inputtype: ToggleInput,
    data: {
      on: "no-gutters",
      off: ""
    }
  }]
});

var blackTheme = {
  'common.bi.image': 'https://uicdn.toast.com/toastui/img/tui-image-editor-bi.png',
  'common.bisize.width': '251px',
  'common.bisize.height': '21px',
  'common.backgroundImage': 'none',
  'common.backgroundColor': '#1e1e1e',
  'common.border': '0px',

  // header
  'header.backgroundImage': 'none',
  'header.backgroundColor': 'transparent',
  'header.border': '0px',

  // load button
  'loadButton.backgroundColor': '#fff',
  'loadButton.border': '1px solid #ddd',
  'loadButton.color': '#222',
  'loadButton.fontFamily': '\'Noto Sans\', sans-serif',
  'loadButton.fontSize': '12px',

  // download button
  'downloadButton.backgroundColor': '#fdba3b',
  'downloadButton.border': '1px solid #fdba3b',
  'downloadButton.color': '#fff',
  'downloadButton.fontFamily': '\'Noto Sans\', sans-serif',
  'downloadButton.fontSize': '12px',

  // main icons
  'menu.normalIcon.path': '/assets/svg/icon-d.svg',
  'menu.normalIcon.name': 'icon-d',
  'menu.activeIcon.path': '/assets/svg/icon-b.svg',
  'menu.activeIcon.name': 'icon-b',
  'menu.disabledIcon.path': '/assets/svg/icon-a.svg',
  'menu.disabledIcon.name': 'icon-a',
  'menu.hoverIcon.path': '/assets/svg/icon-c.svg',
  'menu.hoverIcon.name': 'icon-c',
  'menu.iconSize.width': '24px',
  'menu.iconSize.height': '24px',

  // submenu primary color
  'submenu.backgroundColor': '#1e1e1e',
  'submenu.partition.color': '#3c3c3c',

  // submenu icons
  'submenu.normalIcon.path': '/assets/svg/icon-d.svg',
  'submenu.normalIcon.name': 'icon-d',
  'submenu.activeIcon.path': '/assets/svg/icon-c.svg',
  'submenu.activeIcon.name': 'icon-c',
  'submenu.iconSize.width': '32px',
  'submenu.iconSize.height': '32px',

  // submenu labels
  'submenu.normalLabel.color': '#8a8a8a',
  'submenu.normalLabel.fontWeight': 'lighter',
  'submenu.activeLabel.color': '#fff',
  'submenu.activeLabel.fontWeight': 'lighter',

  // checkbox style
  'checkbox.border': '0px',
  'checkbox.backgroundColor': '#fff',

  // range style
  'range.pointer.color': '#fff',
  'range.bar.color': '#666',
  'range.subbar.color': '#d1d1d1',

  'range.disabledPointer.color': '#414141',
  'range.disabledBar.color': '#282828',
  'range.disabledSubbar.color': '#414141',

  'range.value.color': '#fff',
  'range.value.fontWeight': 'lighter',
  'range.value.fontSize': '11px',
  'range.value.border': '1px solid #353535',
  'range.value.backgroundColor': '#151515',
  'range.title.color': '#fff',
  'range.title.fontWeight': 'lighter',

  // colorpicker style
  'colorpicker.button.border': '1px solid #1e1e1e',
  'colorpicker.title.color': '#fff'
};


var whiteTheme = {
  'common.bi.image': 'https://uicdn.toast.com/toastui/img/tui-image-editor-bi.png',
  'common.bisize.width': '251px',
  'common.bisize.height': '21px',
  'common.backgroundImage': 'none',
  'common.backgroundColor': '#fff',
  'common.border': '1px solid #c1c1c1',

  // header
  'header.backgroundImage': 'none',
  'header.backgroundColor': 'transparent',
  'header.border': '0px',

  // load button
  'loadButton.backgroundColor': '#fff',
  'loadButton.border': '1px solid #ddd',
  'loadButton.color': '#222',
  'loadButton.fontFamily': '\'Noto Sans\', sans-serif',
  'loadButton.fontSize': '12px',

  // download button
  'downloadButton.backgroundColor': '#fdba3b',
  'downloadButton.border': '1px solid #fdba3b',
  'downloadButton.color': '#fff',
  'downloadButton.fontFamily': '\'Noto Sans\', sans-serif',
  'downloadButton.fontSize': '12px',

  // main icons
  'menu.normalIcon.path': '/assets/svg/icon-d.svg',
  'menu.normalIcon.name': 'icon-d',
  'menu.activeIcon.path': '/assets/svg/icon-b.svg',
  'menu.activeIcon.name': 'icon-b',
  'menu.disabledIcon.path': '/assets/svg/icon-a.svg',
  'menu.disabledIcon.name': 'icon-a',
  'menu.hoverIcon.path': '/assets/svg/icon-c.svg',
  'menu.hoverIcon.name': 'icon-c',
  'menu.iconSize.width': '24px',
  'menu.iconSize.height': '24px',

  // submenu primary color
  'submenu.backgroundColor': 'transparent',
  'submenu.partition.color': '#e5e5e5',

  // submenu icons
  'submenu.normalIcon.path': '/assets/svg/icon-d.svg',
  'submenu.normalIcon.name': 'icon-d',
  'submenu.activeIcon.path': '/assets/svg/icon-b.svg',
  'submenu.activeIcon.name': 'icon-b',
  'submenu.iconSize.width': '32px',
  'submenu.iconSize.height': '32px',

  // submenu labels
  'submenu.normalLabel.color': '#858585',
  'submenu.normalLabel.fontWeight': 'normal',
  'submenu.activeLabel.color': '#000',
  'submenu.activeLabel.fontWeight': 'normal',

  // checkbox style
  'checkbox.border': '1px solid #ccc',
  'checkbox.backgroundColor': '#fff',

  // range style
  'range.pointer.color': '#333',
  'range.bar.color': '#ccc',
  'range.subbar.color': '#606060',

  'range.disabledPointer.color': '#d3d3d3',
  'range.disabledBar.color': 'rgba(85,85,85,0.06)',
  'range.disabledSubbar.color': 'rgba(51,51,51,0.2)',

  'range.value.color': '#000',
  'range.value.fontWeight': 'normal',
  'range.value.fontSize': '11px',
  'range.value.border': '0',
  'range.value.backgroundColor': '#f5f5f5',
  'range.title.color': '#000',
  'range.title.fontWeight': 'lighter',

  // colorpicker style
  'colorpicker.button.border': '0px',
  'colorpicker.title.color': '#000'
};

/*
Copyright 2017 Ziadin Givan

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

https://github.com/givanz/FrontyJs
*/

Fronty.ComponentsGroup['Widgets'] = ["widgets/googlemaps", "widgets/video"];


Fronty.Components.extend("_base", "widgets/googlemaps", {
    name: "Google Maps",
    attributes: ["data-component-maps"],
    image: "icons/map.svg",
    dragHtml: '<img src="' + Fronty.baseUrl + 'icons/maps.png">',
    html: '<div data-component-maps style="min-height:240px;min-width:240px;position:relative"><iframe frameborder="0" src="https://maps.google.com/maps?&z=1&t=q&output=embed" width="100" height="100" style="width:100%;height:100%;position:absolute;left:0px;pointer-events:none"></iframe></div>',
    
    
    //url parameters
    z:3, //zoom
    q:'Paris',//location
    t: 'q', //map type q = roadmap, w = satellite
    
    onChange: function (node, property, value)
    {
		map_iframe = jQuery('iframe', node);
		
		this[property.key] = value;
		
		mapurl = 'https://maps.google.com/maps?&q=' + this.q + '&z=' + this.z + '&t=' + this.t + '&output=embed';
		
		map_iframe.attr("src",mapurl);
		
		return node;
	},

    properties: [{
        name: "Address",
        key: "q",
        inputtype: TextInput
    }, 
	{
        name: "Map type",
        key: "t",
        inputtype: SelectInput,
        data:{
			options: [{
                value: "q",
                text: "Roadmap"
            }, {
                value: "w",
                text: "Satellite"
            }]
       },
    },
    {
        name: "Zoom",
        key: "z",
        inputtype: RangeInput,
        data:{
			max: 20, //max zoom level
			min:1,
			step:1
       },
	}]
});

Fronty.Components.extend("_base", "widgets/video", {
    name: "Video",
    attributes: ["data-component-video"],
    image: "icons/video.svg",
    dragHtml: '<img src="' + Fronty.baseUrl + 'icons/video.svg" width="100" height="100">', //use image for drag and swap with iframe on drop for drag performance
    html: '<div data-component-video style="min-height:240px;min-width:240px;position:relative"><iframe frameborder="0" src="https://www.youtube.com/embed/-stFvGmg1A8" style="width:100%;height:100%;position:absolute;left:0px;pointer-events:none"></iframe></div>',
    
    
    //url parameters set with onChange
    t:'y',//video type
    video_id:'',//video id
    url: '', //html5 video src
    autoplay: false,
    controls: true,
    loop: false,

	init: function (node)
	{
		iframe = jQuery('iframe', node);
		video = jQuery('video', node);
		
		$("#right-panel [data-key=url]").hide();
		
		//check if html5
		if (video.length) 
		{
			this.url = video.src;
		} else if (iframe.length) //vimeo or youtube
		{
			src = iframe.attr("src");

			if (src && src.indexOf("youtube"))//youtube
			{
				this.video_id = src.match(/youtube.com\/embed\/([^$\?]*)/)[1];
			} else if (src && src.indexOf("vimeo"))//youtube
			{
				this.video_id = src.match(/vimeo.com\/video\/([^$\?]*)/)[1];
			}
		}
		
		$("#right-panel input[name=video_id]").val(this.video_id);
		$("#right-panel input[name=url]").val(this.url);
	},
	
	onChange: function (node, property, value)
	{
		this[property.key] = value;

		//if (property.key == "t")
		{
			switch (this.t)
			{
				case 'y':
				$("#right-panel [data-key=video_id]").show();
				$("#right-panel [data-key=url]").hide();
				newnode = $('<div data-component-video><iframe src="https://www.youtube.com/embed/' + this.video_id + '?&amp;autoplay=' + this.autoplay + '&amp;controls=' + this.controls + '&amp;loop=' + this.loop + '" allowfullscreen="true" style="height: 100%; width: 100%;" frameborder="0"></iframe></div>');
				break;
				case 'v':
				$("#right-panel [data-key=video_id]").show();
				$("#right-panel [data-key=url]").hide();
				newnode = $('<div data-component-video><iframe src="https://player.vimeo.com/video/' + this.video_id + '?&amp;autoplay=' + this.autoplay + '&amp;controls=' + this.controls + '&amp;loop=' + this.loop + '" allowfullscreen="true" style="height: 100%; width: 100%;" frameborder="0"></iframe></div>');
				break;
				case 'h':
				$("#right-panel [data-key=video_id]").hide();
				$("#right-panel [data-key=url]").show();
				newnode = $('<div data-component-video><video src="' + this.url + '" ' + (this.controls?' controls ':'') + (this.loop?' loop ':'') + ' style="height: 100%; width: 100%;"></video></div>');
				break;
			}
			
			node.replaceWith(newnode);
			return newnode;
		}
		return node;
	},	
	
    properties: [{
        name: "Provider",
        key: "t",
        inputtype: SelectInput,
        data:{
			options: [{
                text: "Youtube",
                value: "y"
            }, {
                text: "Vimeo",
                value: "v"
            },{
                text: "HTML5",
                value: "h"
            }]
       },
	 },	       
     {
        name: "Video id",
        key: "video_id",
        inputtype: TextInput,
    },{
        name: "Url",
        key: "url",
        inputtype: TextInput
    },{
        name: "Autoplay",
        key: "autoplay",
        inputtype: CheckboxInput
    },{
        name: "Controls",
        key: "controls",
        inputtype: CheckboxInput
    },{
        name: "Loop",
        key: "loop",
        inputtype: CheckboxInput
    }]
});



Fronty.Components.extend("_base", "widgets/facebookcomments", {
    name: "Facebook Comments",
    attributes: ["data-component-facebookcomments"],
    image: "icons/facebook.svg",
    dragHtml: '<img src="' + Fronty.baseUrl + 'icons/facebook.svg">',
    html: '<div  data-component-facebookcomments><script>(function(d, s, id) {\
			  var js, fjs = d.getElementsByTagName(s)[0];\
			  if (d.getElementById(id)) return;\
			  js = d.createElement(s); js.id = id;\
			  js.src = "//connect.facebook.net/en_US/sdk.js#xfbml=1&version=v2.6&appId=";\
			  fjs.parentNode.insertBefore(js, fjs);\
			}(document, \'script\', \'facebook-jssdk\'));</script>\
			<div class="fb-comments" \
			data-href="' + window.location.href + '" \
			data-numposts="5" \
			data-colorscheme="light" \
			data-mobile="" \
			data-order-by="social" \
			data-width="100%" \
			></div></div>',
    properties: [{
        name: "Href",
        key: "business",
        htmlAttr: "data-href",
        child:".fb-comments",
        inputtype: TextInput
    },{		
        name: "Item name",
        key: "item_name",
        htmlAttr: "data-numposts",
        child:".fb-comments",
        inputtype: TextInput
    },{		
        name: "Color scheme",
        key: "colorscheme",
        htmlAttr: "data-colorscheme",
        child:".fb-comments",
        inputtype: TextInput
    },{		
        name: "Order by",
        key: "order-by",
        htmlAttr: "data-order-by",
        child:".fb-comments",
        inputtype: TextInput
    },{		
        name: "Currency code",
        key: "width",
        htmlAttr: "data-width",
        child:".fb-comments",
        inputtype: TextInput
	}]
});

Fronty.Components.extend("_base", "widgets/instagram", {
    name: "Instagram",
    attributes: ["data-component-instagram"],
    image: "icons/instagram.svg",
    drophtml: '<img src="' + Fronty.baseUrl + 'icons/instagram.png">',
    html: '<div align=center data-component-instagram>\
			<blockquote class="instagram-media" data-instgrm-captioned data-instgrm-permalink="https://www.instagram.com/p/tsxp1hhQTG/" data-instgrm-version="8" style=" background:#FFF; border:0; border-radius:3px; box-shadow:0 0 1px 0 rgba(0,0,0,0.5),0 1px 10px 0 rgba(0,0,0,0.15); margin: 1px; max-width:658px; padding:0; width:99.375%; width:-webkit-calc(100% - 2px); width:calc(100% - 2px);"><div style="padding:8px;"> <div style=" background:#F8F8F8; line-height:0; margin-top:40px; padding:50% 0; text-align:center; width:100%;"> <div style=" background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACwAAAAsCAMAAAApWqozAAAABGdBTUEAALGPC/xhBQAAAAFzUkdCAK7OHOkAAAAMUExURczMzPf399fX1+bm5mzY9AMAAADiSURBVDjLvZXbEsMgCES5/P8/t9FuRVCRmU73JWlzosgSIIZURCjo/ad+EQJJB4Hv8BFt+IDpQoCx1wjOSBFhh2XssxEIYn3ulI/6MNReE07UIWJEv8UEOWDS88LY97kqyTliJKKtuYBbruAyVh5wOHiXmpi5we58Ek028czwyuQdLKPG1Bkb4NnM+VeAnfHqn1k4+GPT6uGQcvu2h2OVuIf/gWUFyy8OWEpdyZSa3aVCqpVoVvzZZ2VTnn2wU8qzVjDDetO90GSy9mVLqtgYSy231MxrY6I2gGqjrTY0L8fxCxfCBbhWrsYYAAAAAElFTkSuQmCC); display:block; height:44px; margin:0 auto -44px; position:relative; top:-22px; width:44px;"></div></div> <p style=" margin:8px 0 0 0; padding:0 4px;"> <a href="https://www.instagram.com/p/tsxp1hhQTG/" style=" color:#000; font-family:Arial,sans-serif; font-size:14px; font-style:normal; font-weight:normal; line-height:17px; text-decoration:none; word-wrap:break-word;" target="_blank">Text</a></p> <p style=" color:#c9c8cd; font-family:Arial,sans-serif; font-size:14px; line-height:17px; margin-bottom:0; margin-top:8px; overflow:hidden; padding:8px 0 7px; text-align:center; text-overflow:ellipsis; white-space:nowrap;">A post shared by <a href="https://www.instagram.com/instagram/" style=" color:#c9c8cd; font-family:Arial,sans-serif; font-size:14px; font-style:normal; font-weight:normal; line-height:17px;" target="_blank"> Instagram</a> (@instagram) on <time style=" font-family:Arial,sans-serif; font-size:14px; line-height:17px;" datetime="-">-</time></p></div></blockquote>\
			<script async defer src="//www.instagram.com/embed.js"></script>\
		</div>',
    properties: [{
        name: "Widget id",
        key: "instgrm-permalink",
        htmlAttr: "data-instgrm-permalink",
        child: ".instagram-media",
        inputtype: TextInput
    }],
});

Fronty.Components.extend("_base", "widgets/twitter", {
    name: "Twitter",
    attributes: ["data-component-twitter"],
    image: "icons/twitter.svg",
    dragHtml: '<img src="' + Fronty.baseUrl + 'icons/twitter.svg">',
    html: '<div data-component-twitter><a class="twitter-timeline" data-dnt="true" data-chrome="nofooter noborders noscrollbar noheader transparent" href="https://twitter.com/twitterapi" href="https://twitter.com/twitterapi" data-widget-id="243046062967885824" ></a>\
			<script>window.twttr = (function(d, s, id) {\
			  var js, fjs = d.getElementsByTagName(s)[0],\
				t = window.twttr || {};\
			  if (d.getElementById(id)) return t;\
			  js = d.createElement(s);\
			  js.id = id;\
			  js.src = "https://platform.twitter.com/widgets.js";\
			  fjs.parentNode.insertBefore(js, fjs);\
			  t._e = [];\
			  t.ready = function(f) {\
				t._e.push(f);\
			  };\
			  return t;\
			}(document, "script", "twitter-wjs"));</script></div>',
    properties: [{
        name: "Widget id",
        key: "widget-id",
        htmlAttr: "data-widget-id",
        child: " > a, > iframe",
        inputtype: TextInput
    }],
});

Fronty.Components.extend("_base", "widgets/paypal", {
    name: "Paypal",
    attributes: ["data-component-paypal"],
    image: "icons/paypal.svg",
    html: '<form action="https://www.paypal.com/cgi-bin/webscr" method="post" data-component-paypal>\
\
				<!-- Identify your business so that you can collect the payments. -->\
				<input type="hidden" name="business"\
					value="givanz@yahoo.com">\
\
				<!-- Specify a Donate button. -->\
				<input type="hidden" name="cmd" value="_donations">\
\
				<!-- Specify details about the contribution -->\
				<input type="hidden" name="item_name" value="FrontyJs">\
				<input type="hidden" name="item_number" value="Support">\
				<input type="hidden" name="currency_code" value="USD">\
\
				<!-- Display the payment button. -->\
				<input type="image" name="submit"\
				src="https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif"\
				alt="Donate">\
				<img alt="" width="1" height="1"\
				src="https://www.paypalobjects.com/en_US/i/scr/pixel.gif" >\
\
			</form>',
    properties: [{
        name: "Email",
        key: "business",
        htmlAttr: "value",
        child:"input[name='business']",
        inputtype: TextInput
    },{		
        name: "Item name",
        key: "item_name",
        htmlAttr: "value",
        child:"input[name='item_name']",
        inputtype: TextInput
    },{		
        name: "Item number",
        key: "item_number",
        htmlAttr: "value",
        child:"input[name='item_number']",
        inputtype: TextInput
    },{		
        name: "Currency code",
        key: "currency_code",
        htmlAttr: "value",
        child:"input[name='currency_code']",
        inputtype: TextInput
	}],
});
    
Fronty.Components.extend("_base", "widgets/facebookpage", {
    name: "Facebook Page Plugin",
    attributes: ["data-component-facebookpage"],
    image: "icons/facebook.svg",
    dropHtml: '<img src="' + Fronty.baseUrl + 'icons/facebook.png">',
	html: '<div data-component-facebookpage><div class="fb-page" data-href="https://www.facebook.com/facebook" data-appId="100526183620976" data-tabs="timeline" data-small-header="true" data-adapt-container-width="true" data-hide-cover="false" data-show-facepile="true"><blockquote cite="https://www.facebook.com/facebook" class="fb-xfbml-parse-ignore"><a href="https://www.facebook.com/facebook">Facebook</a></blockquote></div>\
			<div id="fb-root"></div>\
			<script>(function(d, s, id) {\
			  var appId = document.getElementsByClassName("fb-page")[0].dataset.appid;\
			  var js, fjs = d.getElementsByTagName(s)[0];\
			  js = d.createElement(s); js.id = id;\
			  js.src = \'https://connect.facebook.net/en_EN/sdk.js#xfbml=1&version=v3.0&appId=" + appId + "&autoLogAppEvents=1\';\
			  fjs.parentNode.insertBefore(js, fjs);\
			}(document, \'script\', \'facebook-jssdk\'));</script></div>',

    properties: [{
        name: "Small header",
        key: "small-header",
        htmlAttr: "data-small-header",
        child:".fb-page",
        inputtype: TextInput
    },{		
        name: "Adapt container width",
        key: "adapt-container-width",
        htmlAttr: "data-adapt-container-width",
        child:".fb-page",
        inputtype: TextInput
    },{		
        name: "Hide cover",
        key: "hide-cover",
        htmlAttr: "data-hide-cover",
        child:".fb-page",
        inputtype: TextInput
    },{		
        name: "Show facepile",
        key: "show-facepile",
        htmlAttr: "data-show-facepile",
        child:".fb-page",
        inputtype: TextInput
    },{		
        name: "App Id",
        key: "appid",
        htmlAttr: "data-appId",
        child:".fb-page",
        inputtype: TextInput
	}],
   onChange: function(node, input, value, component) {
	   //console.log(component.html);
	   //console.log(this.html);
	   
	   var newElement = $(this.html);
	   newElement.find(".fb-page").attr(input.htmlAttr, value);
	   
	   console.log(node.parent());
	   console.log(node.parent().html());
	   node.parent().html(newElement.html());

	   console.log(newElement);


	   console.log(newElement.html());

	   return newElement;
	}	
});
    
Fronty.Components.extend("_base", "widgets/chartjs", {
    name: "Chart.js",
    attributes: ["data-component-chartjs"],
    image: "icons/chart.svg",
	dragHtml: '<img src="' + Fronty.baseUrl + 'icons/chart.svg">',
    html: '<div data-component-chartjs class="chartjs" data-chart=\'{\
			"type": "line",\
			"data": {\
				"labels": ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],\
				"datasets": [{\
					"data": [12, 19, 3, 5, 2, 3],\
					"fill": false,\
					"borderColor":"rgba(255, 99, 132, 0.2)"\
				}, {\
					"fill": false,\
					"data": [3, 15, 7, 4, 19, 12],\
					"borderColor": "rgba(54, 162, 235, 0.2)"\
				}]\
			}}\' style="min-height:240px;min-width:240px;width:100%;height:100%;position:relative">\
			  <canvas></canvas>\
			</div>',
	chartjs: null,
	ctx: null,
	node: null,

	config: {/*
			type: 'line',
			data: {
				labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
				datasets: [{
					data: [12, 19, 3, 5, 2, 3],
					fill: false,
					borderColor:'rgba(255, 99, 132, 0.2)',
				}, {
					fill: false,
					data: [3, 15, 7, 4, 19, 12],
					borderColor: 'rgba(54, 162, 235, 0.2)',
				}]
			},*/
	},		

	dragStart: function (node)
	{
		//check if chartjs is included and if not add it when drag starts to allow the script to load
		body = Fronty.Builder.frameBody;
		
		if ($("#chartjs-script", body).length == 0)
		{
			$(body).append('<script id="chartjs-script" src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.bundle.min.js"></script>');
			$(body).append('<script>\
				$(document).ready(function() {\
					$(".chartjs").each(function () {\
						ctx = $("canvas", this).get(0).getContext("2d");\
						config = JSON.parse(this.dataset.chart);\
						chartjs = new Chart(ctx, config);\
					});\
				\});\
			  </script>');
		}
		
		return node;
	},
	

	drawChart: function ()
	{
		if (this.chartjs != null) this.chartjs.destroy();
		this.node.dataset.chart = JSON.stringify(this.config);
		
		config = Object.assign({}, this.config);//avoid passing by reference to avoid chartjs to fill the object
		this.chartjs = new Chart(this.ctx, config);
	},
	
	init: function (node)
	{
		this.node = node;
		this.ctx = $("canvas", node).get(0).getContext("2d");
		this.config = JSON.parse(node.dataset.chart);
		this.drawChart();

		return node;
	},
  
  
	beforeInit: function (node)
	{
		
		return node;
	},
    
    properties: [
	{
        name: "Type",
        key: "type",
        inputtype: SelectInput,
        data:{
			options: [{
                text: "Line",
                value: "line"
            }, {
                text: "Bar",
                value: "bar"
            }, {
                text: "Pie",
                value: "pie"
            }, {
                text: "Doughnut",
                value: "doughnut"
            }, {
                text: "Polar Area",
                value: "polarArea"
            }, {
                text: "Bubble",
                value: "bubble"
            }, {
                text: "Scatter",
                value: "scatter"
            },{
                text: "Radar",
                value: "radar"
            }]
       },
		init: function(node) {
			return JSON.parse(node.dataset.chart).type;
		},
       onChange: function(node, value, input, component) {
		   component.config.type = value;
		   component.drawChart();
		   
		   return node;
		}
	 }]
});

/*
Copyright 2017 Ziadin Givan

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

https://github.com/givanz/Frontyjs
*/

Fronty.BlocksGroup['Bootstrap 4 Snippets'] = [
  "bootstrap4/linkbar", "bootstrap4/jumbotron-with-title", "bootstrap4/comparison", "bootstrap4/logobar",
  "bootstrap4/details", "bootstrap4/review", "bootstrap4/subtitle-with-button", "bootstrap4/footer"
];

Fronty.Blocks.add("bootstrap4/linkbar", {
    name: "Linkbar",
    dragHtml: '<img src="/assets/thumbnails/linkbar.png">',
    image: "thumbnails/linkbar.png",
    html: `<div class="bg-primary text-white font-weight-bold p-3 text-center">Lorem Ipsum</div>`,
});
Fronty.Blocks.add("bootstrap4/jumbotron-with-title", {
    name: "Jumbotron with title",
    dragHtml: '<img src="/assets/thumbnails/jumbotron-with-title.png">',
    image: "thumbnails/jumbotron-with-title.png",
    html: `<section class="jumbotron jumbotron-fluid text-center">
            <div class="container text-center py-5 my-md-5">
                <h1 class="display-4 lead">What is Lorem Ipsum?</h1>
                <p class="py-4">This is a modified jumbotron that occupies the entire horizontal space of its parent.</p>
                <button type="button" class="btn btn-primary px-5">Lorem Ipsum</button>
            </div>
        </section>`,
});
Fronty.Blocks.add("bootstrap4/comparison", {
    name: "Comparison",
    dragHtml: '<img src="/assets/thumbnails/comparison.png">',
    image: "thumbnails/comparison.png",
    html: ` <section class="pb-3">
            <div class="container px-3 px-md-5">
                <div class="row">
                    <div class="col-md-8 mx-auto py-5">
                        <table class="w-100">
                            <tbody class="text-muted"><tr class="border-bottom text-center">
                                <th></th>
                                <th class="py-3 font-weight-light">other</th>
                                <th class="text-primary">talkspace</th>
                            </tr>
                            <tr class="border-bottom">
                                <td class="pr-5">lorem ipsum</td>
                                <td class="text-center text-muted"><i class="fas fa-times-circle fa-2x"></i></td>
                                <td class=" py-3 text-center text-primary"><i class="fas fa-check-circle fa-2x"></i></td>
                            </tr>
                            <tr class="border-bottom">
                                <td>lorem ipsum</td>
                                <td class="py-3 text-center"><i class="fas fa-times-circle text-muted fa-2x"></i></td>
                                <td class="py-3 text-center text-primary"><i class="fas fa-check-circle fa-2x"></i></td>
                            </tr>
                            <tr class="border-bottom">
                                <td>lorem ipsum</td>
                                <td class="py-3 text-center text-muted"><i class="fas fa-times-circle fa-2x"></i></td>
                                <td class="py-3 text-center text-primary"><i class="fas fa-check-circle fa-2x"></i></td>
                            </tr>
                            </tbody></table>
                    </div>
                </div>
            </div>
        </section>`,
});
Fronty.Blocks.add("bootstrap4/logobar", {
    name: "Logobar",
    dragHtml: '<img src="/assets/thumbnails/logobar.png">',
    image: "thumbnails/logobar.png",
    html: `  <section class="p-3 p-md-5">
            <div class="container px-md-5">
                <div class="row d-flex align-items-center">
                    <div class="col-md-3 col-6 text-center">
                        <img class="img-fluid" src="https://via.placeholder.com/150x50/" alt="logo-1">
                    </div>
                    <div class="col-md-3 col-6 text-center my-3 my-md-0">
                        <img class="img-fluid" src="https://via.placeholder.com/150x50/" alt="logo-2">
                    </div>
                    <div class="col-md-3 col-6 text-center">
                        <img class="img-fluid" src="https://via.placeholder.com/150x50/" alt="logo-3">
                    </div>
                    <div class="col-md-3 col-6 text-center my-3 my-md-0">
                        <img class="img-fluid" src="https://via.placeholder.com/150x50/" alt="logo-4">
                    </div>
                </div>
            </div>
        </section>`,
});
Fronty.Blocks.add("bootstrap4/details", {
    name: "Details",
    dragHtml: '<img src="/assets/thumbnails/details.png">',
    image: "thumbnails/details.png",
    html: `        <section class="p-3 p-md-5">
            <div class="container">
                <div class="row">
                    <h2 class="text-center font-weight-normal w-100 my-4 my-md-5">LOREM IPSUM DOLOR</h2>
                    <div class="col-md-4 text-center">
                        <img class="img-fluid rounded-circle" src="https://via.placeholder.com/150x150/" alt="img-1">
                        <h4 class="font-weight-bold my-3 my-md-4">Lorem ipsum</h4>
                        <p class="text-muted">Lorem ipsum dolor sit, amet consectetur adipisicing elit. Quam laboriosam repellendus exercitationem. Reiciendis non tenetur labore nemo totam voluptatum at aut recusandae explicabo, eligendi dolore omnis, quam facilis modi earum.</p>
                    </div>
                    <div class="col-md-4 text-center my-4 my-md-0">
                        <img class="img-fluid rounded-circle" src="https://via.placeholder.com/150x150/" alt="img-2">
                        <h4 class="font-weight-bold my-3 my-md-4">Lorem ipsum</h4>
                        <p class="text-muted">Lorem ipsum dolor sit, amet consectetur adipisicing elit. Quam laboriosam repellendus
                            exercitationem. Reiciendis non tenetur labore nemo totam voluptatum at aut recusandae explicabo, eligendi dolore
                            omnis, quam facilis modi earum.</p>
                    </div>
                    <div class="col-md-4 text-center">
                        <img class="img-fluid rounded-circle" src="https://via.placeholder.com/150x150/" alt="img-3">
                        <h4 class="font-weight-bold my-3 my-md-4">Lorem ipsum</h4>
                        <p class="text-muted">Lorem ipsum dolor sit, amet consectetur adipisicing elit. Quam laboriosam repellendus
                            exercitationem. Reiciendis non tenetur labore nemo totam voluptatum at aut recusandae explicabo, eligendi dolore
                            omnis, quam facilis modi earum.</p>
                    </div>
                </div>
            </div>
        </section>`,
});
Fronty.Blocks.add("bootstrap4/review", {
    name: "Review",
    dragHtml: '<img src="/assets/thumbnails/review-section.png">',
    image: "thumbnails/review-section.png",
    html: `<section class="p-3 p-md-5">
            <div class="container">
                <div class="row">
                    <h2 class="text-center font-weight-normal w-100 my-4 my-md-5">LOREM IPSUM DOLOR</h2>
                    <div class="col-md-3 text-center p-md-3">
                        <div class="border rounded">
                            <div class="text-primary py-4">
                                <i class="fas fa-star fa-lg"></i>
                                <i class="fas fa-star fa-lg"></i>
                                <i class="fas fa-star fa-lg"></i>
                                <i class="fas fa-star fa-lg"></i>
                                <i class="fas fa-star fa-lg"></i>
                            </div>
                            <p class="text-muted px-4 text-justify">Lorem ipsum, dolor sit amet consectetur adipisicing elit. Quisquam inventore
                                esse consequatur eligendi ipsa adipisci quis? Necessitatibus, reiciendis obcaecati placeat culpa dolores nisi vel
                                fuga ut, hic suscipit numquam at?</p>
                            <h5 class="font-weight-bold py-4">Lorem ipsum</h5>
                        </div>
                    </div>
                    <div class="col-md-3 text-center my-3 my-md-0 p-md-3">
                        <div class="border rounded">
                            <div class="text-primary py-4">
                                <i class="fas fa-star fa-lg"></i>
                                <i class="fas fa-star fa-lg"></i>
                                <i class="fas fa-star fa-lg"></i>
                                <i class="fas fa-star fa-lg"></i>
                                <i class="fas fa-star fa-lg"></i>
                            </div>
                            <p class="text-muted px-4 text-justify">Lorem ipsum, dolor sit amet consectetur adipisicing elit. Quisquam
                                inventore
                                esse consequatur eligendi ipsa adipisci quis? Necessitatibus, reiciendis obcaecati placeat culpa dolores
                                nisi vel
                                fuga ut, hic suscipit numquam at?</p>
                            <h5 class="font-weight-bold py-4">Lorem ipsum</h5>
                        </div>
                    </div>
                    <div class="col-md-3 text-center p-md-3">
                        <div class="border rounded">
                            <div class="text-primary py-4">
                                <i class="fas fa-star fa-lg"></i>
                                <i class="fas fa-star fa-lg"></i>
                                <i class="fas fa-star fa-lg"></i>
                                <i class="fas fa-star fa-lg"></i>
                                <i class="fas fa-star fa-lg"></i>
                            </div>
                            <p class="text-muted px-4 text-justify">Lorem ipsum, dolor sit amet consectetur adipisicing elit. Quisquam
                                inventore
                                esse consequatur eligendi ipsa adipisci quis? Necessitatibus, reiciendis obcaecati placeat culpa dolores
                                nisi vel
                                fuga ut, hic suscipit numquam at?</p>
                            <h5 class="font-weight-bold py-4">Lorem ipsum</h5>
                        </div>
                    </div>
                    <div class="col-md-3 text-center my-3 my-md-0 p-md-3">
                        <div class="border rounded">
                            <div class="text-primary py-4">
                                <i class="fas fa-star fa-lg"></i>
                                <i class="fas fa-star fa-lg"></i>
                                <i class="fas fa-star fa-lg"></i>
                                <i class="fas fa-star fa-lg"></i>
                                <i class="fas fa-star fa-lg"></i>
                            </div>
                            <p class="text-muted px-4 text-justify">Lorem ipsum, dolor sit amet consectetur adipisicing elit. Quisquam
                                inventore
                                esse consequatur eligendi ipsa adipisci quis? Necessitatibus, reiciendis obcaecati placeat culpa dolores
                                nisi vel
                                fuga ut, hic suscipit numquam at?</p>
                            <h5 class="font-weight-bold py-4">Lorem ipsum</h5>
                        </div>
                    </div>
                </div>
            </div>
        </section>`,
});
Fronty.Blocks.add("bootstrap4/subtitle-with-button", {
    name: "Subtitle with Button",
    dragHtml: '<img src="/assets/thumbnails/subtitle-with-button.png">',
    image: "thumbnails/subtitle-with-button.png",
    html: ` <section class="container p-3 p-md-5">
            <div class="row">
                <div class="col text-center">
                    <h2 class="py-4 font-weight-normal text-uppercase">This is a modified jumbotron that occupies the entire.</h2>
                    <button type="button" class="btn btn-primary px-5 py-3 mb-3">Lorem Ipsum</button>
                </div>
            </div>
        </section>`,
});
Fronty.Blocks.add("bootstrap4/footer", {
    name: "Footer",
    dragHtml: '<img src="/assets/thumbnails/footer.png">',
    image: "thumbnails/footer.png",
    html: ` <footer class="bg-primary text-white">
        <div class="p-5 text-center font-weight-bold border-bottom border-light">
            <h5>Talkspace</h5>
        </div>
        <div class="p-2 p-md-4 d-flex justify-content-between flex-column flex-md-row align-items-center">
            <p class="mb-0 order-2 order-md-1"><i class="far fa-copyright fa-xs mb-3 mb-md-0"></i> 2018</p>
            <ul class="list-unstyled d-flex mb-0 order-1 order-md-2 my-3 my-md-0">
                <li class="mr-4"><a class="text-white" href="#">Privacy policy</a></li>
                <li><a class="text-white" href="#">Terms of use</a></li>
            </ul>
        </div>
    </footer>`,
});

// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE

// This is CodeMirror (http://codemirror.net), a code editor
// implemented in JavaScript on top of the browser's DOM.
//
// You can find some technical background for some of the code below
// at http://marijnhaverbeke.nl/blog/#cm-internals .

(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  typeof define === 'function' && define.amd ? define(factory) :
  (global.CodeMirror = factory());
}(this, (function () { 'use strict';

// Kludges for bugs and behavior differences that can't be feature
// detected are enabled based on userAgent etc sniffing.
var userAgent = navigator.userAgent
var platform = navigator.platform

var gecko = /gecko\/\d/i.test(userAgent)
var ie_upto10 = /MSIE \d/.test(userAgent)
var ie_11up = /Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(userAgent)
var edge = /Edge\/(\d+)/.exec(userAgent)
var ie = ie_upto10 || ie_11up || edge
var ie_version = ie && (ie_upto10 ? document.documentMode || 6 : +(edge || ie_11up)[1])
var webkit = !edge && /WebKit\//.test(userAgent)
var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(userAgent)
var chrome = !edge && /Chrome\//.test(userAgent)
var presto = /Opera\//.test(userAgent)
var safari = /Apple Computer/.test(navigator.vendor)
var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(userAgent)
var phantom = /PhantomJS/.test(userAgent)

var ios = !edge && /AppleWebKit/.test(userAgent) && /Mobile\/\w+/.test(userAgent)
var android = /Android/.test(userAgent)
// This is woefully incomplete. Suggestions for alternative methods welcome.
var mobile = ios || android || /webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(userAgent)
var mac = ios || /Mac/.test(platform)
var chromeOS = /\bCrOS\b/.test(userAgent)
var windows = /win/i.test(platform)

var presto_version = presto && userAgent.match(/Version\/(\d*\.\d*)/)
if (presto_version) { presto_version = Number(presto_version[1]) }
if (presto_version && presto_version >= 15) { presto = false; webkit = true }
// Some browsers use the wrong event properties to signal cmd/ctrl on OS X
var flipCtrlCmd = mac && (qtwebkit || presto && (presto_version == null || presto_version < 12.11))
var captureRightClick = gecko || (ie && ie_version >= 9)

function classTest(cls) { return new RegExp("(^|\\s)" + cls + "(?:$|\\s)\\s*") }

var rmClass = function(node, cls) {
  var current = node.className
  var match = classTest(cls).exec(current)
  if (match) {
    var after = current.slice(match.index + match[0].length)
    node.className = current.slice(0, match.index) + (after ? match[1] + after : "")
  }
}

function removeChildren(e) {
  for (var count = e.childNodes.length; count > 0; --count)
    { e.removeChild(e.firstChild) }
  return e
}

function removeChildrenAndAdd(parent, e) {
  return removeChildren(parent).appendChild(e)
}

function elt(tag, content, className, style) {
  var e = document.createElement(tag)
  if (className) { e.className = className }
  if (style) { e.style.cssText = style }
  if (typeof content == "string") { e.appendChild(document.createTextNode(content)) }
  else if (content) { for (var i = 0; i < content.length; ++i) { e.appendChild(content[i]) } }
  return e
}
// wrapper for elt, which removes the elt from the accessibility tree
function eltP(tag, content, className, style) {
  var e = elt(tag, content, className, style)
  e.setAttribute("role", "presentation")
  return e
}

var range
if (document.createRange) { range = function(node, start, end, endNode) {
  var r = document.createRange()
  r.setEnd(endNode || node, end)
  r.setStart(node, start)
  return r
} }
else { range = function(node, start, end) {
  var r = document.body.createTextRange()
  try { r.moveToElementText(node.parentNode) }
  catch(e) { return r }
  r.collapse(true)
  r.moveEnd("character", end)
  r.moveStart("character", start)
  return r
} }

function contains(parent, child) {
  if (child.nodeType == 3) // Android browser always returns false when child is a textnode
    { child = child.parentNode }
  if (parent.contains)
    { return parent.contains(child) }
  do {
    if (child.nodeType == 11) { child = child.host }
    if (child == parent) { return true }
  } while (child = child.parentNode)
}

function activeElt() {
  // IE and Edge may throw an "Unspecified Error" when accessing document.activeElement.
  // IE < 10 will throw when accessed while the page is loading or in an iframe.
  // IE > 9 and Edge will throw when accessed in an iframe if document.body is unavailable.
  var activeElement
  try {
    activeElement = document.activeElement
  } catch(e) {
    activeElement = document.body || null
  }
  while (activeElement && activeElement.shadowRoot && activeElement.shadowRoot.activeElement)
    { activeElement = activeElement.shadowRoot.activeElement }
  return activeElement
}

function addClass(node, cls) {
  var current = node.className
  if (!classTest(cls).test(current)) { node.className += (current ? " " : "") + cls }
}
function joinClasses(a, b) {
  var as = a.split(" ")
  for (var i = 0; i < as.length; i++)
    { if (as[i] && !classTest(as[i]).test(b)) { b += " " + as[i] } }
  return b
}

var selectInput = function(node) { node.select() }
if (ios) // Mobile Safari apparently has a bug where select() is broken.
  { selectInput = function(node) { node.selectionStart = 0; node.selectionEnd = node.value.length } }
else if (ie) // Suppress mysterious IE10 errors
  { selectInput = function(node) { try { node.select() } catch(_e) {} } }

function bind(f) {
  var args = Array.prototype.slice.call(arguments, 1)
  return function(){return f.apply(null, args)}
}

function copyObj(obj, target, overwrite) {
  if (!target) { target = {} }
  for (var prop in obj)
    { if (obj.hasOwnProperty(prop) && (overwrite !== false || !target.hasOwnProperty(prop)))
      { target[prop] = obj[prop] } }
  return target
}

// Counts the column offset in a string, taking tabs into account.
// Used mostly to find indentation.
function countColumn(string, end, tabSize, startIndex, startValue) {
  if (end == null) {
    end = string.search(/[^\s\u00a0]/)
    if (end == -1) { end = string.length }
  }
  for (var i = startIndex || 0, n = startValue || 0;;) {
    var nextTab = string.indexOf("\t", i)
    if (nextTab < 0 || nextTab >= end)
      { return n + (end - i) }
    n += nextTab - i
    n += tabSize - (n % tabSize)
    i = nextTab + 1
  }
}

var Delayed = function() {this.id = null};
Delayed.prototype.set = function (ms, f) {
  clearTimeout(this.id)
  this.id = setTimeout(f, ms)
};

function indexOf(array, elt) {
  for (var i = 0; i < array.length; ++i)
    { if (array[i] == elt) { return i } }
  return -1
}

// Number of pixels added to scroller and sizer to hide scrollbar
var scrollerGap = 30

// Returned or thrown by various protocols to signal 'I'm not
// handling this'.
var Pass = {toString: function(){return "CodeMirror.Pass"}}

// Reused option objects for setSelection & friends
var sel_dontScroll = {scroll: false};
var sel_mouse = {origin: "*mouse"};
var sel_move = {origin: "+move"};
// The inverse of countColumn -- find the offset that corresponds to
// a particular column.
function findColumn(string, goal, tabSize) {
  for (var pos = 0, col = 0;;) {
    var nextTab = string.indexOf("\t", pos)
    if (nextTab == -1) { nextTab = string.length }
    var skipped = nextTab - pos
    if (nextTab == string.length || col + skipped >= goal)
      { return pos + Math.min(skipped, goal - col) }
    col += nextTab - pos
    col += tabSize - (col % tabSize)
    pos = nextTab + 1
    if (col >= goal) { return pos }
  }
}

var spaceStrs = [""]
function spaceStr(n) {
  while (spaceStrs.length <= n)
    { spaceStrs.push(lst(spaceStrs) + " ") }
  return spaceStrs[n]
}

function lst(arr) { return arr[arr.length-1] }

function map(array, f) {
  var out = []
  for (var i = 0; i < array.length; i++) { out[i] = f(array[i], i) }
  return out
}

function insertSorted(array, value, score) {
  var pos = 0, priority = score(value)
  while (pos < array.length && score(array[pos]) <= priority) { pos++ }
  array.splice(pos, 0, value)
}

function nothing() {}

function createObj(base, props) {
  var inst
  if (Object.create) {
    inst = Object.create(base)
  } else {
    nothing.prototype = base
    inst = new nothing()
  }
  if (props) { copyObj(props, inst) }
  return inst
}

var nonASCIISingleCaseWordChar = /[\u00df\u0587\u0590-\u05f4\u0600-\u06ff\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/
function isWordCharBasic(ch) {
  return /\w/.test(ch) || ch > "\x80" &&
    (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch))
}
function isWordChar(ch, helper) {
  if (!helper) { return isWordCharBasic(ch) }
  if (helper.source.indexOf("\\w") > -1 && isWordCharBasic(ch)) { return true }
  return helper.test(ch)
}

function isEmpty(obj) {
  for (var n in obj) { if (obj.hasOwnProperty(n) && obj[n]) { return false } }
  return true
}

// Extending unicode characters. A series of a non-extending char +
// any number of extending chars is treated as a single unit as far
// as editing and measuring is concerned. This is not fully correct,
// since some scripts/fonts/browsers also treat other configurations
// of code points as a group.
var extendingChars = /[\u0300-\u036f\u0483-\u0489\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u065e\u0670\u06d6-\u06dc\u06de-\u06e4\u06e7\u06e8\u06ea-\u06ed\u0711\u0730-\u074a\u07a6-\u07b0\u07eb-\u07f3\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0900-\u0902\u093c\u0941-\u0948\u094d\u0951-\u0955\u0962\u0963\u0981\u09bc\u09be\u09c1-\u09c4\u09cd\u09d7\u09e2\u09e3\u0a01\u0a02\u0a3c\u0a41\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a70\u0a71\u0a75\u0a81\u0a82\u0abc\u0ac1-\u0ac5\u0ac7\u0ac8\u0acd\u0ae2\u0ae3\u0b01\u0b3c\u0b3e\u0b3f\u0b41-\u0b44\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b82\u0bbe\u0bc0\u0bcd\u0bd7\u0c3e-\u0c40\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0cbc\u0cbf\u0cc2\u0cc6\u0ccc\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0d3e\u0d41-\u0d44\u0d4d\u0d57\u0d62\u0d63\u0dca\u0dcf\u0dd2-\u0dd4\u0dd6\u0ddf\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0eb1\u0eb4-\u0eb9\u0ebb\u0ebc\u0ec8-\u0ecd\u0f18\u0f19\u0f35\u0f37\u0f39\u0f71-\u0f7e\u0f80-\u0f84\u0f86\u0f87\u0f90-\u0f97\u0f99-\u0fbc\u0fc6\u102d-\u1030\u1032-\u1037\u1039\u103a\u103d\u103e\u1058\u1059\u105e-\u1060\u1071-\u1074\u1082\u1085\u1086\u108d\u109d\u135f\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b7-\u17bd\u17c6\u17c9-\u17d3\u17dd\u180b-\u180d\u18a9\u1920-\u1922\u1927\u1928\u1932\u1939-\u193b\u1a17\u1a18\u1a56\u1a58-\u1a5e\u1a60\u1a62\u1a65-\u1a6c\u1a73-\u1a7c\u1a7f\u1b00-\u1b03\u1b34\u1b36-\u1b3a\u1b3c\u1b42\u1b6b-\u1b73\u1b80\u1b81\u1ba2-\u1ba5\u1ba8\u1ba9\u1c2c-\u1c33\u1c36\u1c37\u1cd0-\u1cd2\u1cd4-\u1ce0\u1ce2-\u1ce8\u1ced\u1dc0-\u1de6\u1dfd-\u1dff\u200c\u200d\u20d0-\u20f0\u2cef-\u2cf1\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua66f-\ua672\ua67c\ua67d\ua6f0\ua6f1\ua802\ua806\ua80b\ua825\ua826\ua8c4\ua8e0-\ua8f1\ua926-\ua92d\ua947-\ua951\ua980-\ua982\ua9b3\ua9b6-\ua9b9\ua9bc\uaa29-\uaa2e\uaa31\uaa32\uaa35\uaa36\uaa43\uaa4c\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uabe5\uabe8\uabed\udc00-\udfff\ufb1e\ufe00-\ufe0f\ufe20-\ufe26\uff9e\uff9f]/
function isExtendingChar(ch) { return ch.charCodeAt(0) >= 768 && extendingChars.test(ch) }

// Returns a number from the range [`0`; `str.length`] unless `pos` is outside that range.
function skipExtendingChars(str, pos, dir) {
  while ((dir < 0 ? pos > 0 : pos < str.length) && isExtendingChar(str.charAt(pos))) { pos += dir }
  return pos
}

// Returns the value from the range [`from`; `to`] that satisfies
// `pred` and is closest to `from`. Assumes that at least `to`
// satisfies `pred`. Supports `from` being greater than `to`.
function findFirst(pred, from, to) {
  // At any point we are certain `to` satisfies `pred`, don't know
  // whether `from` does.
  var dir = from > to ? -1 : 1
  for (;;) {
    if (from == to) { return from }
    var midF = (from + to) / 2, mid = dir < 0 ? Math.ceil(midF) : Math.floor(midF)
    if (mid == from) { return pred(mid) ? from : to }
    if (pred(mid)) { to = mid }
    else { from = mid + dir }
  }
}

// The display handles the DOM integration, both for input reading
// and content drawing. It holds references to DOM nodes and
// display-related state.

function Display(place, doc, input) {
  var d = this
  this.input = input

  // Covers bottom-right square when both scrollbars are present.
  d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler")
  d.scrollbarFiller.setAttribute("cm-not-content", "true")
  // Covers bottom of gutter when coverGutterNextToScrollbar is on
  // and h scrollbar is present.
  d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler")
  d.gutterFiller.setAttribute("cm-not-content", "true")
  // Will contain the actual code, positioned to cover the viewport.
  d.lineDiv = eltP("div", null, "CodeMirror-code")
  // Elements are added to these to represent selection and cursors.
  d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1")
  d.cursorDiv = elt("div", null, "CodeMirror-cursors")
  // A visibility: hidden element used to find the size of things.
  d.measure = elt("div", null, "CodeMirror-measure")
  // When lines outside of the viewport are measured, they are drawn in this.
  d.lineMeasure = elt("div", null, "CodeMirror-measure")
  // Wraps everything that needs to exist inside the vertically-padded coordinate system
  d.lineSpace = eltP("div", [d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv],
                    null, "position: relative; outline: none")
  var lines = eltP("div", [d.lineSpace], "CodeMirror-lines")
  // Moved around its parent to cover visible view.
  d.mover = elt("div", [lines], null, "position: relative")
  // Set to the height of the document, allowing scrolling.
  d.sizer = elt("div", [d.mover], "CodeMirror-sizer")
  d.sizerWidth = null
  // Behavior of elts with overflow: auto and padding is
  // inconsistent across browsers. This is used to ensure the
  // scrollable area is big enough.
  d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerGap + "px; width: 1px;")
  // Will contain the gutters, if any.
  d.gutters = elt("div", null, "CodeMirror-gutters")
  d.lineGutter = null
  // Actual scrollable element.
  d.scroller = elt("div", [d.sizer, d.heightForcer, d.gutters], "CodeMirror-scroll")
  d.scroller.setAttribute("tabIndex", "-1")
  // The element in which the editor lives.
  d.wrapper = elt("div", [d.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror")

  // Work around IE7 z-index bug (not perfect, hence IE7 not really being supported)
  if (ie && ie_version < 8) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0 }
  if (!webkit && !(gecko && mobile)) { d.scroller.draggable = true }

  if (place) {
    if (place.appendChild) { place.appendChild(d.wrapper) }
    else { place(d.wrapper) }
  }

  // Current rendered range (may be bigger than the view window).
  d.viewFrom = d.viewTo = doc.first
  d.reportedViewFrom = d.reportedViewTo = doc.first
  // Information about the rendered lines.
  d.view = []
  d.renderedView = null
  // Holds info about a single rendered line when it was rendered
  // for measurement, while not in view.
  d.externalMeasured = null
  // Empty space (in pixels) above the view
  d.viewOffset = 0
  d.lastWrapHeight = d.lastWrapWidth = 0
  d.updateLineNumbers = null

  d.nativeBarWidth = d.barHeight = d.barWidth = 0
  d.scrollbarsClipped = false

  // Used to only resize the line number gutter when necessary (when
  // the amount of lines crosses a boundary that makes its width change)
  d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null
  // Set to true when a non-horizontal-scrolling line widget is
  // added. As an optimization, line widget aligning is skipped when
  // this is false.
  d.alignWidgets = false

  d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null

  // Tracks the maximum line length so that the horizontal scrollbar
  // can be kept static when scrolling.
  d.maxLine = null
  d.maxLineLength = 0
  d.maxLineChanged = false

  // Used for measuring wheel scrolling granularity
  d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null

  // True when shift is held down.
  d.shift = false

  // Used to track whether anything happened since the context menu
  // was opened.
  d.selForContextMenu = null

  d.activeTouch = null

  input.init(d)
}

// Find the line object corresponding to the given line number.
function getLine(doc, n) {
  n -= doc.first
  if (n < 0 || n >= doc.size) { throw new Error("There is no line " + (n + doc.first) + " in the document.") }
  var chunk = doc
  while (!chunk.lines) {
    for (var i = 0;; ++i) {
      var child = chunk.children[i], sz = child.chunkSize()
      if (n < sz) { chunk = child; break }
      n -= sz
    }
  }
  return chunk.lines[n]
}

// Get the part of a document between two positions, as an array of
// strings.
function getBetween(doc, start, end) {
  var out = [], n = start.line
  doc.iter(start.line, end.line + 1, function (line) {
    var text = line.text
    if (n == end.line) { text = text.slice(0, end.ch) }
    if (n == start.line) { text = text.slice(start.ch) }
    out.push(text)
    ++n
  })
  return out
}
// Get the lines between from and to, as array of strings.
function getLines(doc, from, to) {
  var out = []
  doc.iter(from, to, function (line) { out.push(line.text) }) // iter aborts when callback returns truthy value
  return out
}

// Update the height of a line, propagating the height change
// upwards to parent nodes.
function updateLineHeight(line, height) {
  var diff = height - line.height
  if (diff) { for (var n = line; n; n = n.parent) { n.height += diff } }
}

// Given a line object, find its line number by walking up through
// its parent links.
function lineNo(line) {
  if (line.parent == null) { return null }
  var cur = line.parent, no = indexOf(cur.lines, line)
  for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
    for (var i = 0;; ++i) {
      if (chunk.children[i] == cur) { break }
      no += chunk.children[i].chunkSize()
    }
  }
  return no + cur.first
}

// Find the line at the given vertical position, using the height
// information in the document tree.
function lineAtHeight(chunk, h) {
  var n = chunk.first
  outer: do {
    for (var i$1 = 0; i$1 < chunk.children.length; ++i$1) {
      var child = chunk.children[i$1], ch = child.height
      if (h < ch) { chunk = child; continue outer }
      h -= ch
      n += child.chunkSize()
    }
    return n
  } while (!chunk.lines)
  var i = 0
  for (; i < chunk.lines.length; ++i) {
    var line = chunk.lines[i], lh = line.height
    if (h < lh) { break }
    h -= lh
  }
  return n + i
}

function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size}

function lineNumberFor(options, i) {
  return String(options.lineNumberFormatter(i + options.firstLineNumber))
}

// A Pos instance represents a position within the text.
function Pos(line, ch, sticky) {
  if ( sticky === void 0 ) sticky = null;

  if (!(this instanceof Pos)) { return new Pos(line, ch, sticky) }
  this.line = line
  this.ch = ch
  this.sticky = sticky
}

// Compare two positions, return 0 if they are the same, a negative
// number when a is less, and a positive number otherwise.
function cmp(a, b) { return a.line - b.line || a.ch - b.ch }

function equalCursorPos(a, b) { return a.sticky == b.sticky && cmp(a, b) == 0 }

function copyPos(x) {return Pos(x.line, x.ch)}
function maxPos(a, b) { return cmp(a, b) < 0 ? b : a }
function minPos(a, b) { return cmp(a, b) < 0 ? a : b }

// Most of the external API clips given positions to make sure they
// actually exist within the document.
function clipLine(doc, n) {return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1))}
function clipPos(doc, pos) {
  if (pos.line < doc.first) { return Pos(doc.first, 0) }
  var last = doc.first + doc.size - 1
  if (pos.line > last) { return Pos(last, getLine(doc, last).text.length) }
  return clipToLen(pos, getLine(doc, pos.line).text.length)
}
function clipToLen(pos, linelen) {
  var ch = pos.ch
  if (ch == null || ch > linelen) { return Pos(pos.line, linelen) }
  else if (ch < 0) { return Pos(pos.line, 0) }
  else { return pos }
}
function clipPosArray(doc, array) {
  var out = []
  for (var i = 0; i < array.length; i++) { out[i] = clipPos(doc, array[i]) }
  return out
}

// Optimize some code when these features are not used.
var sawReadOnlySpans = false;
var sawCollapsedSpans = false;
function seeReadOnlySpans() {
  sawReadOnlySpans = true
}

function seeCollapsedSpans() {
  sawCollapsedSpans = true
}

// TEXTMARKER SPANS

function MarkedSpan(marker, from, to) {
  this.marker = marker
  this.from = from; this.to = to
}

// Search an array of spans for a span matching the given marker.
function getMarkedSpanFor(spans, marker) {
  if (spans) { for (var i = 0; i < spans.length; ++i) {
    var span = spans[i]
    if (span.marker == marker) { return span }
  } }
}
// Remove a span from an array, returning undefined if no spans are
// left (we don't store arrays for lines without spans).
function removeMarkedSpan(spans, span) {
  var r
  for (var i = 0; i < spans.length; ++i)
    { if (spans[i] != span) { (r || (r = [])).push(spans[i]) } }
  return r
}
// Add a span to a line.
function addMarkedSpan(line, span) {
  line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span]
  span.marker.attachLine(line)
}

// Used for the algorithm that adjusts markers for a change in the
// document. These functions cut an array of spans at a given
// character position, returning an array of remaining chunks (or
// undefined if nothing remains).
function markedSpansBefore(old, startCh, isInsert) {
  var nw
  if (old) { for (var i = 0; i < old.length; ++i) {
    var span = old[i], marker = span.marker
    var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh)
    if (startsBefore || span.from == startCh && marker.type == "bookmark" && (!isInsert || !span.marker.insertLeft)) {
      var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh)
      ;(nw || (nw = [])).push(new MarkedSpan(marker, span.from, endsAfter ? null : span.to))
    }
  } }
  return nw
}
function markedSpansAfter(old, endCh, isInsert) {
  var nw
  if (old) { for (var i = 0; i < old.length; ++i) {
    var span = old[i], marker = span.marker
    var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh)
    if (endsAfter || span.from == endCh && marker.type == "bookmark" && (!isInsert || span.marker.insertLeft)) {
      var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh)
      ;(nw || (nw = [])).push(new MarkedSpan(marker, startsBefore ? null : span.from - endCh,
                                            span.to == null ? null : span.to - endCh))
    }
  } }
  return nw
}

// Given a change object, compute the new set of marker spans that
// cover the line in which the change took place. Removes spans
// entirely within the change, reconnects spans belonging to the
// same marker that appear on both sides of the change, and cuts off
// spans partially within the change. Returns an array of span
// arrays with one element for each line in (after) the change.
function stretchSpansOverChange(doc, change) {
  if (change.full) { return null }
  var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans
  var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans
  if (!oldFirst && !oldLast) { return null }

  var startCh = change.from.ch, endCh = change.to.ch, isInsert = cmp(change.from, change.to) == 0
  // Get the spans that 'stick out' on both sides
  var first = markedSpansBefore(oldFirst, startCh, isInsert)
  var last = markedSpansAfter(oldLast, endCh, isInsert)

  // Next, merge those two ends
  var sameLine = change.text.length == 1, offset = lst(change.text).length + (sameLine ? startCh : 0)
  if (first) {
    // Fix up .to properties of first
    for (var i = 0; i < first.length; ++i) {
      var span = first[i]
      if (span.to == null) {
        var found = getMarkedSpanFor(last, span.marker)
        if (!found) { span.to = startCh }
        else if (sameLine) { span.to = found.to == null ? null : found.to + offset }
      }
    }
  }
  if (last) {
    // Fix up .from in last (or move them into first in case of sameLine)
    for (var i$1 = 0; i$1 < last.length; ++i$1) {
      var span$1 = last[i$1]
      if (span$1.to != null) { span$1.to += offset }
      if (span$1.from == null) {
        var found$1 = getMarkedSpanFor(first, span$1.marker)
        if (!found$1) {
          span$1.from = offset
          if (sameLine) { (first || (first = [])).push(span$1) }
        }
      } else {
        span$1.from += offset
        if (sameLine) { (first || (first = [])).push(span$1) }
      }
    }
  }
  // Make sure we didn't create any zero-length spans
  if (first) { first = clearEmptySpans(first) }
  if (last && last != first) { last = clearEmptySpans(last) }

  var newMarkers = [first]
  if (!sameLine) {
    // Fill gap with whole-line-spans
    var gap = change.text.length - 2, gapMarkers
    if (gap > 0 && first)
      { for (var i$2 = 0; i$2 < first.length; ++i$2)
        { if (first[i$2].to == null)
          { (gapMarkers || (gapMarkers = [])).push(new MarkedSpan(first[i$2].marker, null, null)) } } }
    for (var i$3 = 0; i$3 < gap; ++i$3)
      { newMarkers.push(gapMarkers) }
    newMarkers.push(last)
  }
  return newMarkers
}

// Remove spans that are empty and don't have a clearWhenEmpty
// option of false.
function clearEmptySpans(spans) {
  for (var i = 0; i < spans.length; ++i) {
    var span = spans[i]
    if (span.from != null && span.from == span.to && span.marker.clearWhenEmpty !== false)
      { spans.splice(i--, 1) }
  }
  if (!spans.length) { return null }
  return spans
}

// Used to 'clip' out readOnly ranges when making a change.
function removeReadOnlyRanges(doc, from, to) {
  var markers = null
  doc.iter(from.line, to.line + 1, function (line) {
    if (line.markedSpans) { for (var i = 0; i < line.markedSpans.length; ++i) {
      var mark = line.markedSpans[i].marker
      if (mark.readOnly && (!markers || indexOf(markers, mark) == -1))
        { (markers || (markers = [])).push(mark) }
    } }
  })
  if (!markers) { return null }
  var parts = [{from: from, to: to}]
  for (var i = 0; i < markers.length; ++i) {
    var mk = markers[i], m = mk.find(0)
    for (var j = 0; j < parts.length; ++j) {
      var p = parts[j]
      if (cmp(p.to, m.from) < 0 || cmp(p.from, m.to) > 0) { continue }
      var newParts = [j, 1], dfrom = cmp(p.from, m.from), dto = cmp(p.to, m.to)
      if (dfrom < 0 || !mk.inclusiveLeft && !dfrom)
        { newParts.push({from: p.from, to: m.from}) }
      if (dto > 0 || !mk.inclusiveRight && !dto)
        { newParts.push({from: m.to, to: p.to}) }
      parts.splice.apply(parts, newParts)
      j += newParts.length - 3
    }
  }
  return parts
}

// Connect or disconnect spans from a line.
function detachMarkedSpans(line) {
  var spans = line.markedSpans
  if (!spans) { return }
  for (var i = 0; i < spans.length; ++i)
    { spans[i].marker.detachLine(line) }
  line.markedSpans = null
}
function attachMarkedSpans(line, spans) {
  if (!spans) { return }
  for (var i = 0; i < spans.length; ++i)
    { spans[i].marker.attachLine(line) }
  line.markedSpans = spans
}

// Helpers used when computing which overlapping collapsed span
// counts as the larger one.
function extraLeft(marker) { return marker.inclusiveLeft ? -1 : 0 }
function extraRight(marker) { return marker.inclusiveRight ? 1 : 0 }

// Returns a number indicating which of two overlapping collapsed
// spans is larger (and thus includes the other). Falls back to
// comparing ids when the spans cover exactly the same range.
function compareCollapsedMarkers(a, b) {
  var lenDiff = a.lines.length - b.lines.length
  if (lenDiff != 0) { return lenDiff }
  var aPos = a.find(), bPos = b.find()
  var fromCmp = cmp(aPos.from, bPos.from) || extraLeft(a) - extraLeft(b)
  if (fromCmp) { return -fromCmp }
  var toCmp = cmp(aPos.to, bPos.to) || extraRight(a) - extraRight(b)
  if (toCmp) { return toCmp }
  return b.id - a.id
}

// Find out whether a line ends or starts in a collapsed span. If
// so, return the marker for that span.
function collapsedSpanAtSide(line, start) {
  var sps = sawCollapsedSpans && line.markedSpans, found
  if (sps) { for (var sp = (void 0), i = 0; i < sps.length; ++i) {
    sp = sps[i]
    if (sp.marker.collapsed && (start ? sp.from : sp.to) == null &&
        (!found || compareCollapsedMarkers(found, sp.marker) < 0))
      { found = sp.marker }
  } }
  return found
}
function collapsedSpanAtStart(line) { return collapsedSpanAtSide(line, true) }
function collapsedSpanAtEnd(line) { return collapsedSpanAtSide(line, false) }

// Test whether there exists a collapsed span that partially
// overlaps (covers the start or end, but not both) of a new span.
// Such overlap is not allowed.
function conflictingCollapsedRange(doc, lineNo, from, to, marker) {
  var line = getLine(doc, lineNo)
  var sps = sawCollapsedSpans && line.markedSpans
  if (sps) { for (var i = 0; i < sps.length; ++i) {
    var sp = sps[i]
    if (!sp.marker.collapsed) { continue }
    var found = sp.marker.find(0)
    var fromCmp = cmp(found.from, from) || extraLeft(sp.marker) - extraLeft(marker)
    var toCmp = cmp(found.to, to) || extraRight(sp.marker) - extraRight(marker)
    if (fromCmp >= 0 && toCmp <= 0 || fromCmp <= 0 && toCmp >= 0) { continue }
    if (fromCmp <= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.to, from) >= 0 : cmp(found.to, from) > 0) ||
        fromCmp >= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.from, to) <= 0 : cmp(found.from, to) < 0))
      { return true }
  } }
}

// A visual line is a line as drawn on the screen. Folding, for
// example, can cause multiple logical lines to appear on the same
// visual line. This finds the start of the visual line that the
// given line is part of (usually that is the line itself).
function visualLine(line) {
  var merged
  while (merged = collapsedSpanAtStart(line))
    { line = merged.find(-1, true).line }
  return line
}

function visualLineEnd(line) {
  var merged
  while (merged = collapsedSpanAtEnd(line))
    { line = merged.find(1, true).line }
  return line
}

// Returns an array of logical lines that continue the visual line
// started by the argument, or undefined if there are no such lines.
function visualLineContinued(line) {
  var merged, lines
  while (merged = collapsedSpanAtEnd(line)) {
    line = merged.find(1, true).line
    ;(lines || (lines = [])).push(line)
  }
  return lines
}

// Get the line number of the start of the visual line that the
// given line number is part of.
function visualLineNo(doc, lineN) {
  var line = getLine(doc, lineN), vis = visualLine(line)
  if (line == vis) { return lineN }
  return lineNo(vis)
}

// Get the line number of the start of the next visual line after
// the given line.
function visualLineEndNo(doc, lineN) {
  if (lineN > doc.lastLine()) { return lineN }
  var line = getLine(doc, lineN), merged
  if (!lineIsHidden(doc, line)) { return lineN }
  while (merged = collapsedSpanAtEnd(line))
    { line = merged.find(1, true).line }
  return lineNo(line) + 1
}

// Compute whether a line is hidden. Lines count as hidden when they
// are part of a visual line that starts with another line, or when
// they are entirely covered by collapsed, non-widget span.
function lineIsHidden(doc, line) {
  var sps = sawCollapsedSpans && line.markedSpans
  if (sps) { for (var sp = (void 0), i = 0; i < sps.length; ++i) {
    sp = sps[i]
    if (!sp.marker.collapsed) { continue }
    if (sp.from == null) { return true }
    if (sp.marker.widgetNode) { continue }
    if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp))
      { return true }
  } }
}
function lineIsHiddenInner(doc, line, span) {
  if (span.to == null) {
    var end = span.marker.find(1, true)
    return lineIsHiddenInner(doc, end.line, getMarkedSpanFor(end.line.markedSpans, span.marker))
  }
  if (span.marker.inclusiveRight && span.to == line.text.length)
    { return true }
  for (var sp = (void 0), i = 0; i < line.markedSpans.length; ++i) {
    sp = line.markedSpans[i]
    if (sp.marker.collapsed && !sp.marker.widgetNode && sp.from == span.to &&
        (sp.to == null || sp.to != span.from) &&
        (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&
        lineIsHiddenInner(doc, line, sp)) { return true }
  }
}

// Find the height above the given line.
function heightAtLine(lineObj) {
  lineObj = visualLine(lineObj)

  var h = 0, chunk = lineObj.parent
  for (var i = 0; i < chunk.lines.length; ++i) {
    var line = chunk.lines[i]
    if (line == lineObj) { break }
    else { h += line.height }
  }
  for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {
    for (var i$1 = 0; i$1 < p.children.length; ++i$1) {
      var cur = p.children[i$1]
      if (cur == chunk) { break }
      else { h += cur.height }
    }
  }
  return h
}

// Compute the character length of a line, taking into account
// collapsed ranges (see markText) that might hide parts, and join
// other lines onto it.
function lineLength(line) {
  if (line.height == 0) { return 0 }
  var len = line.text.length, merged, cur = line
  while (merged = collapsedSpanAtStart(cur)) {
    var found = merged.find(0, true)
    cur = found.from.line
    len += found.from.ch - found.to.ch
  }
  cur = line
  while (merged = collapsedSpanAtEnd(cur)) {
    var found$1 = merged.find(0, true)
    len -= cur.text.length - found$1.from.ch
    cur = found$1.to.line
    len += cur.text.length - found$1.to.ch
  }
  return len
}

// Find the longest line in the document.
function findMaxLine(cm) {
  var d = cm.display, doc = cm.doc
  d.maxLine = getLine(doc, doc.first)
  d.maxLineLength = lineLength(d.maxLine)
  d.maxLineChanged = true
  doc.iter(function (line) {
    var len = lineLength(line)
    if (len > d.maxLineLength) {
      d.maxLineLength = len
      d.maxLine = line
    }
  })
}

// BIDI HELPERS

function iterateBidiSections(order, from, to, f) {
  if (!order) { return f(from, to, "ltr", 0) }
  var found = false
  for (var i = 0; i < order.length; ++i) {
    var part = order[i]
    if (part.from < to && part.to > from || from == to && part.to == from) {
      f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? "rtl" : "ltr", i)
      found = true
    }
  }
  if (!found) { f(from, to, "ltr") }
}

var bidiOther = null
function getBidiPartAt(order, ch, sticky) {
  var found
  bidiOther = null
  for (var i = 0; i < order.length; ++i) {
    var cur = order[i]
    if (cur.from < ch && cur.to > ch) { return i }
    if (cur.to == ch) {
      if (cur.from != cur.to && sticky == "before") { found = i }
      else { bidiOther = i }
    }
    if (cur.from == ch) {
      if (cur.from != cur.to && sticky != "before") { found = i }
      else { bidiOther = i }
    }
  }
  return found != null ? found : bidiOther
}

// Bidirectional ordering algorithm
// See http://unicode.org/reports/tr9/tr9-13.html for the algorithm
// that this (partially) implements.

// One-char codes used for character types:
// L (L):   Left-to-Right
// R (R):   Right-to-Left
// r (AL):  Right-to-Left Arabic
// 1 (EN):  European Number
// + (ES):  European Number Separator
// % (ET):  European Number Terminator
// n (AN):  Arabic Number
// , (CS):  Common Number Separator
// m (NSM): Non-Spacing Mark
// b (BN):  Boundary Neutral
// s (B):   Paragraph Separator
// t (S):   Segment Separator
// w (WS):  Whitespace
// N (ON):  Other Neutrals

// Returns null if characters are ordered as they appear
// (left-to-right), or an array of sections ({from, to, level}
// objects) in the order in which they occur visually.
var bidiOrdering = (function() {
  // Character types for codepoints 0 to 0xff
  var lowTypes = "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLN"
  // Character types for codepoints 0x600 to 0x6f9
  var arabicTypes = "nnnnnnNNr%%r,rNNmmmmmmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmmmnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmnNmmmmmmrrmmNmmmmrr1111111111"
  function charType(code) {
    if (code <= 0xf7) { return lowTypes.charAt(code) }
    else if (0x590 <= code && code <= 0x5f4) { return "R" }
    else if (0x600 <= code && code <= 0x6f9) { return arabicTypes.charAt(code - 0x600) }
    else if (0x6ee <= code && code <= 0x8ac) { return "r" }
    else if (0x2000 <= code && code <= 0x200b) { return "w" }
    else if (code == 0x200c) { return "b" }
    else { return "L" }
  }

  var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/
  var isNeutral = /[stwN]/, isStrong = /[LRr]/, countsAsLeft = /[Lb1n]/, countsAsNum = /[1n]/

  function BidiSpan(level, from, to) {
    this.level = level
    this.from = from; this.to = to
  }

  return function(str, direction) {
    var outerType = direction == "ltr" ? "L" : "R"

    if (str.length == 0 || direction == "ltr" && !bidiRE.test(str)) { return false }
    var len = str.length, types = []
    for (var i = 0; i < len; ++i)
      { types.push(charType(str.charCodeAt(i))) }

    // W1. Examine each non-spacing mark (NSM) in the level run, and
    // change the type of the NSM to the type of the previous
    // character. If the NSM is at the start of the level run, it will
    // get the type of sor.
    for (var i$1 = 0, prev = outerType; i$1 < len; ++i$1) {
      var type = types[i$1]
      if (type == "m") { types[i$1] = prev }
      else { prev = type }
    }

    // W2. Search backwards from each instance of a European number
    // until the first strong type (R, L, AL, or sor) is found. If an
    // AL is found, change the type of the European number to Arabic
    // number.
    // W3. Change all ALs to R.
    for (var i$2 = 0, cur = outerType; i$2 < len; ++i$2) {
      var type$1 = types[i$2]
      if (type$1 == "1" && cur == "r") { types[i$2] = "n" }
      else if (isStrong.test(type$1)) { cur = type$1; if (type$1 == "r") { types[i$2] = "R" } }
    }

    // W4. A single European separator between two European numbers
    // changes to a European number. A single common separator between
    // two numbers of the same type changes to that type.
    for (var i$3 = 1, prev$1 = types[0]; i$3 < len - 1; ++i$3) {
      var type$2 = types[i$3]
      if (type$2 == "+" && prev$1 == "1" && types[i$3+1] == "1") { types[i$3] = "1" }
      else if (type$2 == "," && prev$1 == types[i$3+1] &&
               (prev$1 == "1" || prev$1 == "n")) { types[i$3] = prev$1 }
      prev$1 = type$2
    }

    // W5. A sequence of European terminators adjacent to European
    // numbers changes to all European numbers.
    // W6. Otherwise, separators and terminators change to Other
    // Neutral.
    for (var i$4 = 0; i$4 < len; ++i$4) {
      var type$3 = types[i$4]
      if (type$3 == ",") { types[i$4] = "N" }
      else if (type$3 == "%") {
        var end = (void 0)
        for (end = i$4 + 1; end < len && types[end] == "%"; ++end) {}
        var replace = (i$4 && types[i$4-1] == "!") || (end < len && types[end] == "1") ? "1" : "N"
        for (var j = i$4; j < end; ++j) { types[j] = replace }
        i$4 = end - 1
      }
    }

    // W7. Search backwards from each instance of a European number
    // until the first strong type (R, L, or sor) is found. If an L is
    // found, then change the type of the European number to L.
    for (var i$5 = 0, cur$1 = outerType; i$5 < len; ++i$5) {
      var type$4 = types[i$5]
      if (cur$1 == "L" && type$4 == "1") { types[i$5] = "L" }
      else if (isStrong.test(type$4)) { cur$1 = type$4 }
    }

    // N1. A sequence of neutrals takes the direction of the
    // surrounding strong text if the text on both sides has the same
    // direction. European and Arabic numbers act as if they were R in
    // terms of their influence on neutrals. Start-of-level-run (sor)
    // and end-of-level-run (eor) are used at level run boundaries.
    // N2. Any remaining neutrals take the embedding direction.
    for (var i$6 = 0; i$6 < len; ++i$6) {
      if (isNeutral.test(types[i$6])) {
        var end$1 = (void 0)
        for (end$1 = i$6 + 1; end$1 < len && isNeutral.test(types[end$1]); ++end$1) {}
        var before = (i$6 ? types[i$6-1] : outerType) == "L"
        var after = (end$1 < len ? types[end$1] : outerType) == "L"
        var replace$1 = before == after ? (before ? "L" : "R") : outerType
        for (var j$1 = i$6; j$1 < end$1; ++j$1) { types[j$1] = replace$1 }
        i$6 = end$1 - 1
      }
    }

    // Here we depart from the documented algorithm, in order to avoid
    // building up an actual levels array. Since there are only three
    // levels (0, 1, 2) in an implementation that doesn't take
    // explicit embedding into account, we can build up the order on
    // the fly, without following the level-based algorithm.
    var order = [], m
    for (var i$7 = 0; i$7 < len;) {
      if (countsAsLeft.test(types[i$7])) {
        var start = i$7
        for (++i$7; i$7 < len && countsAsLeft.test(types[i$7]); ++i$7) {}
        order.push(new BidiSpan(0, start, i$7))
      } else {
        var pos = i$7, at = order.length
        for (++i$7; i$7 < len && types[i$7] != "L"; ++i$7) {}
        for (var j$2 = pos; j$2 < i$7;) {
          if (countsAsNum.test(types[j$2])) {
            if (pos < j$2) { order.splice(at, 0, new BidiSpan(1, pos, j$2)) }
            var nstart = j$2
            for (++j$2; j$2 < i$7 && countsAsNum.test(types[j$2]); ++j$2) {}
            order.splice(at, 0, new BidiSpan(2, nstart, j$2))
            pos = j$2
          } else { ++j$2 }
        }
        if (pos < i$7) { order.splice(at, 0, new BidiSpan(1, pos, i$7)) }
      }
    }
    if (direction == "ltr") {
      if (order[0].level == 1 && (m = str.match(/^\s+/))) {
        order[0].from = m[0].length
        order.unshift(new BidiSpan(0, 0, m[0].length))
      }
      if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
        lst(order).to -= m[0].length
        order.push(new BidiSpan(0, len - m[0].length, len))
      }
    }

    return direction == "rtl" ? order.reverse() : order
  }
})()

// Get the bidi ordering for the given line (and cache it). Returns
// false for lines that are fully left-to-right, and an array of
// BidiSpan objects otherwise.
function getOrder(line, direction) {
  var order = line.order
  if (order == null) { order = line.order = bidiOrdering(line.text, direction) }
  return order
}

// EVENT HANDLING

// Lightweight event framework. on/off also work on DOM nodes,
// registering native DOM handlers.

var noHandlers = []

var on = function(emitter, type, f) {
  if (emitter.addEventListener) {
    emitter.addEventListener(type, f, false)
  } else if (emitter.attachEvent) {
    emitter.attachEvent("on" + type, f)
  } else {
    var map = emitter._handlers || (emitter._handlers = {})
    map[type] = (map[type] || noHandlers).concat(f)
  }
}

function getHandlers(emitter, type) {
  return emitter._handlers && emitter._handlers[type] || noHandlers
}

function off(emitter, type, f) {
  if (emitter.removeEventListener) {
    emitter.removeEventListener(type, f, false)
  } else if (emitter.detachEvent) {
    emitter.detachEvent("on" + type, f)
  } else {
    var map = emitter._handlers, arr = map && map[type]
    if (arr) {
      var index = indexOf(arr, f)
      if (index > -1)
        { map[type] = arr.slice(0, index).concat(arr.slice(index + 1)) }
    }
  }
}

function signal(emitter, type /*, values...*/) {
  var handlers = getHandlers(emitter, type)
  if (!handlers.length) { return }
  var args = Array.prototype.slice.call(arguments, 2)
  for (var i = 0; i < handlers.length; ++i) { handlers[i].apply(null, args) }
}

// The DOM events that CodeMirror handles can be overridden by
// registering a (non-DOM) handler on the editor for the event name,
// and preventDefault-ing the event in that handler.
function signalDOMEvent(cm, e, override) {
  if (typeof e == "string")
    { e = {type: e, preventDefault: function() { this.defaultPrevented = true }} }
  signal(cm, override || e.type, cm, e)
  return e_defaultPrevented(e) || e.codemirrorIgnore
}

function signalCursorActivity(cm) {
  var arr = cm._handlers && cm._handlers.cursorActivity
  if (!arr) { return }
  var set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = [])
  for (var i = 0; i < arr.length; ++i) { if (indexOf(set, arr[i]) == -1)
    { set.push(arr[i]) } }
}

function hasHandler(emitter, type) {
  return getHandlers(emitter, type).length > 0
}

// Add on and off methods to a constructor's prototype, to make
// registering events on such objects more convenient.
function eventMixin(ctor) {
  ctor.prototype.on = function(type, f) {on(this, type, f)}
  ctor.prototype.off = function(type, f) {off(this, type, f)}
}

// Due to the fact that we still support jurassic IE versions, some
// compatibility wrappers are needed.

function e_preventDefault(e) {
  if (e.preventDefault) { e.preventDefault() }
  else { e.returnValue = false }
}
function e_stopPropagation(e) {
  if (e.stopPropagation) { e.stopPropagation() }
  else { e.cancelBubble = true }
}
function e_defaultPrevented(e) {
  return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false
}
function e_stop(e) {e_preventDefault(e); e_stopPropagation(e)}

function e_target(e) {return e.target || e.srcElement}
function e_button(e) {
  var b = e.which
  if (b == null) {
    if (e.button & 1) { b = 1 }
    else if (e.button & 2) { b = 3 }
    else if (e.button & 4) { b = 2 }
  }
  if (mac && e.ctrlKey && b == 1) { b = 3 }
  return b
}

// Detect drag-and-drop
var dragAndDrop = function() {
  // There is *some* kind of drag-and-drop support in IE6-8, but I
  // couldn't get it to work yet.
  if (ie && ie_version < 9) { return false }
  var div = elt('div')
  return "draggable" in div || "dragDrop" in div
}()

var zwspSupported
function zeroWidthElement(measure) {
  if (zwspSupported == null) {
    var test = elt("span", "\u200b")
    removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]))
    if (measure.firstChild.offsetHeight != 0)
      { zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !(ie && ie_version < 8) }
  }
  var node = zwspSupported ? elt("span", "\u200b") :
    elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px")
  node.setAttribute("cm-text", "")
  return node
}

// Feature-detect IE's crummy client rect reporting for bidi text
var badBidiRects
function hasBadBidiRects(measure) {
  if (badBidiRects != null) { return badBidiRects }
  var txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA"))
  var r0 = range(txt, 0, 1).getBoundingClientRect()
  var r1 = range(txt, 1, 2).getBoundingClientRect()
  removeChildren(measure)
  if (!r0 || r0.left == r0.right) { return false } // Safari returns null in some cases (#2780)
  return badBidiRects = (r1.right - r0.right < 3)
}

// See if "".split is the broken IE version, if so, provide an
// alternative way to split lines.
var splitLinesAuto = "\n\nb".split(/\n/).length != 3 ? function (string) {
  var pos = 0, result = [], l = string.length
  while (pos <= l) {
    var nl = string.indexOf("\n", pos)
    if (nl == -1) { nl = string.length }
    var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl)
    var rt = line.indexOf("\r")
    if (rt != -1) {
      result.push(line.slice(0, rt))
      pos += rt + 1
    } else {
      result.push(line)
      pos = nl + 1
    }
  }
  return result
} : function (string) { return string.split(/\r\n?|\n/); }

var hasSelection = window.getSelection ? function (te) {
  try { return te.selectionStart != te.selectionEnd }
  catch(e) { return false }
} : function (te) {
  var range
  try {range = te.ownerDocument.selection.createRange()}
  catch(e) {}
  if (!range || range.parentElement() != te) { return false }
  return range.compareEndPoints("StartToEnd", range) != 0
}

var hasCopyEvent = (function () {
  var e = elt("div")
  if ("oncopy" in e) { return true }
  e.setAttribute("oncopy", "return;")
  return typeof e.oncopy == "function"
})()

var badZoomedRects = null
function hasBadZoomedRects(measure) {
  if (badZoomedRects != null) { return badZoomedRects }
  var node = removeChildrenAndAdd(measure, elt("span", "x"))
  var normal = node.getBoundingClientRect()
  var fromRange = range(node, 0, 1).getBoundingClientRect()
  return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1
}

var modes = {};
var mimeModes = {};
// Extra arguments are stored as the mode's dependencies, which is
// used by (legacy) mechanisms like loadmode.js to automatically
// load a mode. (Preferred mechanism is the require/define calls.)
function defineMode(name, mode) {
  if (arguments.length > 2)
    { mode.dependencies = Array.prototype.slice.call(arguments, 2) }
  modes[name] = mode
}

function defineMIME(mime, spec) {
  mimeModes[mime] = spec
}

// Given a MIME type, a {name, ...options} config object, or a name
// string, return a mode config object.
function resolveMode(spec) {
  if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {
    spec = mimeModes[spec]
  } else if (spec && typeof spec.name == "string" && mimeModes.hasOwnProperty(spec.name)) {
    var found = mimeModes[spec.name]
    if (typeof found == "string") { found = {name: found} }
    spec = createObj(found, spec)
    spec.name = found.name
  } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)) {
    return resolveMode("application/xml")
  } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+json$/.test(spec)) {
    return resolveMode("application/json")
  }
  if (typeof spec == "string") { return {name: spec} }
  else { return spec || {name: "null"} }
}

// Given a mode spec (anything that resolveMode accepts), find and
// initialize an actual mode object.
function getMode(options, spec) {
  spec = resolveMode(spec)
  var mfactory = modes[spec.name]
  if (!mfactory) { return getMode(options, "text/plain") }
  var modeObj = mfactory(options, spec)
  if (modeExtensions.hasOwnProperty(spec.name)) {
    var exts = modeExtensions[spec.name]
    for (var prop in exts) {
      if (!exts.hasOwnProperty(prop)) { continue }
      if (modeObj.hasOwnProperty(prop)) { modeObj["_" + prop] = modeObj[prop] }
      modeObj[prop] = exts[prop]
    }
  }
  modeObj.name = spec.name
  if (spec.helperType) { modeObj.helperType = spec.helperType }
  if (spec.modeProps) { for (var prop$1 in spec.modeProps)
    { modeObj[prop$1] = spec.modeProps[prop$1] } }

  return modeObj
}

// This can be used to attach properties to mode objects from
// outside the actual mode definition.
var modeExtensions = {}
function extendMode(mode, properties) {
  var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {})
  copyObj(properties, exts)
}

function copyState(mode, state) {
  if (state === true) { return state }
  if (mode.copyState) { return mode.copyState(state) }
  var nstate = {}
  for (var n in state) {
    var val = state[n]
    if (val instanceof Array) { val = val.concat([]) }
    nstate[n] = val
  }
  return nstate
}

// Given a mode and a state (for that mode), find the inner mode and
// state at the position that the state refers to.
function innerMode(mode, state) {
  var info
  while (mode.innerMode) {
    info = mode.innerMode(state)
    if (!info || info.mode == mode) { break }
    state = info.state
    mode = info.mode
  }
  return info || {mode: mode, state: state}
}

function startState(mode, a1, a2) {
  return mode.startState ? mode.startState(a1, a2) : true
}

// STRING STREAM

// Fed to the mode parsers, provides helper functions to make
// parsers more succinct.

var StringStream = function(string, tabSize, lineOracle) {
  this.pos = this.start = 0
  this.string = string
  this.tabSize = tabSize || 8
  this.lastColumnPos = this.lastColumnValue = 0
  this.lineStart = 0
  this.lineOracle = lineOracle
};

StringStream.prototype.eol = function () {return this.pos >= this.string.length};
StringStream.prototype.sol = function () {return this.pos == this.lineStart};
StringStream.prototype.peek = function () {return this.string.charAt(this.pos) || undefined};
StringStream.prototype.next = function () {
  if (this.pos < this.string.length)
    { return this.string.charAt(this.pos++) }
};
StringStream.prototype.eat = function (match) {
  var ch = this.string.charAt(this.pos)
  var ok
  if (typeof match == "string") { ok = ch == match }
  else { ok = ch && (match.test ? match.test(ch) : match(ch)) }
  if (ok) {++this.pos; return ch}
};
StringStream.prototype.eatWhile = function (match) {
  var start = this.pos
  while (this.eat(match)){}
  return this.pos > start
};
StringStream.prototype.eatSpace = function () {
    var this$1 = this;

  var start = this.pos
  while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) { ++this$1.pos }
  return this.pos > start
};
StringStream.prototype.skipToEnd = function () {this.pos = this.string.length};
StringStream.prototype.skipTo = function (ch) {
  var found = this.string.indexOf(ch, this.pos)
  if (found > -1) {this.pos = found; return true}
};
StringStream.prototype.backUp = function (n) {this.pos -= n};
StringStream.prototype.column = function () {
  if (this.lastColumnPos < this.start) {
    this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue)
    this.lastColumnPos = this.start
  }
  return this.lastColumnValue - (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
};
StringStream.prototype.indentation = function () {
  return countColumn(this.string, null, this.tabSize) -
    (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
};
StringStream.prototype.match = function (pattern, consume, caseInsensitive) {
  if (typeof pattern == "string") {
    var cased = function (str) { return caseInsensitive ? str.toLowerCase() : str; }
    var substr = this.string.substr(this.pos, pattern.length)
    if (cased(substr) == cased(pattern)) {
      if (consume !== false) { this.pos += pattern.length }
      return true
    }
  } else {
    var match = this.string.slice(this.pos).match(pattern)
    if (match && match.index > 0) { return null }
    if (match && consume !== false) { this.pos += match[0].length }
    return match
  }
};
StringStream.prototype.current = function (){return this.string.slice(this.start, this.pos)};
StringStream.prototype.hideFirstChars = function (n, inner) {
  this.lineStart += n
  try { return inner() }
  finally { this.lineStart -= n }
};
StringStream.prototype.lookAhead = function (n) {
  var oracle = this.lineOracle
  return oracle && oracle.lookAhead(n)
};
StringStream.prototype.baseToken = function () {
  var oracle = this.lineOracle
  return oracle && oracle.baseToken(this.pos)
};

var SavedContext = function(state, lookAhead) {
  this.state = state
  this.lookAhead = lookAhead
};

var Context = function(doc, state, line, lookAhead) {
  this.state = state
  this.doc = doc
  this.line = line
  this.maxLookAhead = lookAhead || 0
  this.baseTokens = null
  this.baseTokenPos = 1
};

Context.prototype.lookAhead = function (n) {
  var line = this.doc.getLine(this.line + n)
  if (line != null && n > this.maxLookAhead) { this.maxLookAhead = n }
  return line
};

Context.prototype.baseToken = function (n) {
    var this$1 = this;

  if (!this.baseTokens) { return null }
  while (this.baseTokens[this.baseTokenPos] <= n)
    { this$1.baseTokenPos += 2 }
  var type = this.baseTokens[this.baseTokenPos + 1]
  return {type: type && type.replace(/( |^)overlay .*/, ""),
          size: this.baseTokens[this.baseTokenPos] - n}
};

Context.prototype.nextLine = function () {
  this.line++
  if (this.maxLookAhead > 0) { this.maxLookAhead-- }
};

Context.fromSaved = function (doc, saved, line) {
  if (saved instanceof SavedContext)
    { return new Context(doc, copyState(doc.mode, saved.state), line, saved.lookAhead) }
  else
    { return new Context(doc, copyState(doc.mode, saved), line) }
};

Context.prototype.save = function (copy) {
  var state = copy !== false ? copyState(this.doc.mode, this.state) : this.state
  return this.maxLookAhead > 0 ? new SavedContext(state, this.maxLookAhead) : state
};


// Compute a style array (an array starting with a mode generation
// -- for invalidation -- followed by pairs of end positions and
// style strings), which is used to highlight the tokens on the
// line.
function highlightLine(cm, line, context, forceToEnd) {
  // A styles array always starts with a number identifying the
  // mode/overlays that it is based on (for easy invalidation).
  var st = [cm.state.modeGen], lineClasses = {}
  // Compute the base array of styles
  runMode(cm, line.text, cm.doc.mode, context, function (end, style) { return st.push(end, style); },
          lineClasses, forceToEnd)
  var state = context.state

  // Run overlays, adjust style array.
  var loop = function ( o ) {
    context.baseTokens = st
    var overlay = cm.state.overlays[o], i = 1, at = 0
    context.state = true
    runMode(cm, line.text, overlay.mode, context, function (end, style) {
      var start = i
      // Ensure there's a token end at the current position, and that i points at it
      while (at < end) {
        var i_end = st[i]
        if (i_end > end)
          { st.splice(i, 1, end, st[i+1], i_end) }
        i += 2
        at = Math.min(end, i_end)
      }
      if (!style) { return }
      if (overlay.opaque) {
        st.splice(start, i - start, end, "overlay " + style)
        i = start + 2
      } else {
        for (; start < i; start += 2) {
          var cur = st[start+1]
          st[start+1] = (cur ? cur + " " : "") + "overlay " + style
        }
      }
    }, lineClasses)
    context.state = state
    context.baseTokens = null
    context.baseTokenPos = 1
  };

  for (var o = 0; o < cm.state.overlays.length; ++o) loop( o );

  return {styles: st, classes: lineClasses.bgClass || lineClasses.textClass ? lineClasses : null}
}

function getLineStyles(cm, line, updateFrontier) {
  if (!line.styles || line.styles[0] != cm.state.modeGen) {
    var context = getContextBefore(cm, lineNo(line))
    var resetState = line.text.length > cm.options.maxHighlightLength && copyState(cm.doc.mode, context.state)
    var result = highlightLine(cm, line, context)
    if (resetState) { context.state = resetState }
    line.stateAfter = context.save(!resetState)
    line.styles = result.styles
    if (result.classes) { line.styleClasses = result.classes }
    else if (line.styleClasses) { line.styleClasses = null }
    if (updateFrontier === cm.doc.highlightFrontier)
      { cm.doc.modeFrontier = Math.max(cm.doc.modeFrontier, ++cm.doc.highlightFrontier) }
  }
  return line.styles
}

function getContextBefore(cm, n, precise) {
  var doc = cm.doc, display = cm.display
  if (!doc.mode.startState) { return new Context(doc, true, n) }
  var start = findStartLine(cm, n, precise)
  var saved = start > doc.first && getLine(doc, start - 1).stateAfter
  var context = saved ? Context.fromSaved(doc, saved, start) : new Context(doc, startState(doc.mode), start)

  doc.iter(start, n, function (line) {
    processLine(cm, line.text, context)
    var pos = context.line
    line.stateAfter = pos == n - 1 || pos % 5 == 0 || pos >= display.viewFrom && pos < display.viewTo ? context.save() : null
    context.nextLine()
  })
  if (precise) { doc.modeFrontier = context.line }
  return context
}

// Lightweight form of highlight -- proceed over this line and
// update state, but don't save a style array. Used for lines that
// aren't currently visible.
function processLine(cm, text, context, startAt) {
  var mode = cm.doc.mode
  var stream = new StringStream(text, cm.options.tabSize, context)
  stream.start = stream.pos = startAt || 0
  if (text == "") { callBlankLine(mode, context.state) }
  while (!stream.eol()) {
    readToken(mode, stream, context.state)
    stream.start = stream.pos
  }
}

function callBlankLine(mode, state) {
  if (mode.blankLine) { return mode.blankLine(state) }
  if (!mode.innerMode) { return }
  var inner = innerMode(mode, state)
  if (inner.mode.blankLine) { return inner.mode.blankLine(inner.state) }
}

function readToken(mode, stream, state, inner) {
  for (var i = 0; i < 10; i++) {
    if (inner) { inner[0] = innerMode(mode, state).mode }
    var style = mode.token(stream, state)
    if (stream.pos > stream.start) { return style }
  }
  throw new Error("Mode " + mode.name + " failed to advance stream.")
}

var Token = function(stream, type, state) {
  this.start = stream.start; this.end = stream.pos
  this.string = stream.current()
  this.type = type || null
  this.state = state
};

// Utility for getTokenAt and getLineTokens
function takeToken(cm, pos, precise, asArray) {
  var doc = cm.doc, mode = doc.mode, style
  pos = clipPos(doc, pos)
  var line = getLine(doc, pos.line), context = getContextBefore(cm, pos.line, precise)
  var stream = new StringStream(line.text, cm.options.tabSize, context), tokens
  if (asArray) { tokens = [] }
  while ((asArray || stream.pos < pos.ch) && !stream.eol()) {
    stream.start = stream.pos
    style = readToken(mode, stream, context.state)
    if (asArray) { tokens.push(new Token(stream, style, copyState(doc.mode, context.state))) }
  }
  return asArray ? tokens : new Token(stream, style, context.state)
}

function extractLineClasses(type, output) {
  if (type) { for (;;) {
    var lineClass = type.match(/(?:^|\s+)line-(background-)?(\S+)/)
    if (!lineClass) { break }
    type = type.slice(0, lineClass.index) + type.slice(lineClass.index + lineClass[0].length)
    var prop = lineClass[1] ? "bgClass" : "textClass"
    if (output[prop] == null)
      { output[prop] = lineClass[2] }
    else if (!(new RegExp("(?:^|\s)" + lineClass[2] + "(?:$|\s)")).test(output[prop]))
      { output[prop] += " " + lineClass[2] }
  } }
  return type
}

// Run the given mode's parser over a line, calling f for each token.
function runMode(cm, text, mode, context, f, lineClasses, forceToEnd) {
  var flattenSpans = mode.flattenSpans
  if (flattenSpans == null) { flattenSpans = cm.options.flattenSpans }
  var curStart = 0, curStyle = null
  var stream = new StringStream(text, cm.options.tabSize, context), style
  var inner = cm.options.addModeClass && [null]
  if (text == "") { extractLineClasses(callBlankLine(mode, context.state), lineClasses) }
  while (!stream.eol()) {
    if (stream.pos > cm.options.maxHighlightLength) {
      flattenSpans = false
      if (forceToEnd) { processLine(cm, text, context, stream.pos) }
      stream.pos = text.length
      style = null
    } else {
      style = extractLineClasses(readToken(mode, stream, context.state, inner), lineClasses)
    }
    if (inner) {
      var mName = inner[0].name
      if (mName) { style = "m-" + (style ? mName + " " + style : mName) }
    }
    if (!flattenSpans || curStyle != style) {
      while (curStart < stream.start) {
        curStart = Math.min(stream.start, curStart + 5000)
        f(curStart, curStyle)
      }
      curStyle = style
    }
    stream.start = stream.pos
  }
  while (curStart < stream.pos) {
    // Webkit seems to refuse to render text nodes longer than 57444
    // characters, and returns inaccurate measurements in nodes
    // starting around 5000 chars.
    var pos = Math.min(stream.pos, curStart + 5000)
    f(pos, curStyle)
    curStart = pos
  }
}

// Finds the line to start with when starting a parse. Tries to
// find a line with a stateAfter, so that it can start with a
// valid state. If that fails, it returns the line with the
// smallest indentation, which tends to need the least context to
// parse correctly.
function findStartLine(cm, n, precise) {
  var minindent, minline, doc = cm.doc
  var lim = precise ? -1 : n - (cm.doc.mode.innerMode ? 1000 : 100)
  for (var search = n; search > lim; --search) {
    if (search <= doc.first) { return doc.first }
    var line = getLine(doc, search - 1), after = line.stateAfter
    if (after && (!precise || search + (after instanceof SavedContext ? after.lookAhead : 0) <= doc.modeFrontier))
      { return search }
    var indented = countColumn(line.text, null, cm.options.tabSize)
    if (minline == null || minindent > indented) {
      minline = search - 1
      minindent = indented
    }
  }
  return minline
}

function retreatFrontier(doc, n) {
  doc.modeFrontier = Math.min(doc.modeFrontier, n)
  if (doc.highlightFrontier < n - 10) { return }
  var start = doc.first
  for (var line = n - 1; line > start; line--) {
    var saved = getLine(doc, line).stateAfter
    // change is on 3
    // state on line 1 looked ahead 2 -- so saw 3
    // test 1 + 2 < 3 should cover this
    if (saved && (!(saved instanceof SavedContext) || line + saved.lookAhead < n)) {
      start = line + 1
      break
    }
  }
  doc.highlightFrontier = Math.min(doc.highlightFrontier, start)
}

// LINE DATA STRUCTURE

// Line objects. These hold state related to a line, including
// highlighting info (the styles array).
var Line = function(text, markedSpans, estimateHeight) {
  this.text = text
  attachMarkedSpans(this, markedSpans)
  this.height = estimateHeight ? estimateHeight(this) : 1
};

Line.prototype.lineNo = function () { return lineNo(this) };
eventMixin(Line)

// Change the content (text, markers) of a line. Automatically
// invalidates cached information and tries to re-estimate the
// line's height.
function updateLine(line, text, markedSpans, estimateHeight) {
  line.text = text
  if (line.stateAfter) { line.stateAfter = null }
  if (line.styles) { line.styles = null }
  if (line.order != null) { line.order = null }
  detachMarkedSpans(line)
  attachMarkedSpans(line, markedSpans)
  var estHeight = estimateHeight ? estimateHeight(line) : 1
  if (estHeight != line.height) { updateLineHeight(line, estHeight) }
}

// Detach a line from the document tree and its markers.
function cleanUpLine(line) {
  line.parent = null
  detachMarkedSpans(line)
}

// Convert a style as returned by a mode (either null, or a string
// containing one or more styles) to a CSS style. This is cached,
// and also looks for line-wide styles.
var styleToClassCache = {};
var styleToClassCacheWithMode = {};
function interpretTokenStyle(style, options) {
  if (!style || /^\s*$/.test(style)) { return null }
  var cache = options.addModeClass ? styleToClassCacheWithMode : styleToClassCache
  return cache[style] ||
    (cache[style] = style.replace(/\S+/g, "cm-$&"))
}

// Render the DOM representation of the text of a line. Also builds
// up a 'line map', which points at the DOM nodes that represent
// specific stretches of text, and is used by the measuring code.
// The returned object contains the DOM node, this map, and
// information about line-wide styles that were set by the mode.
function buildLineContent(cm, lineView) {
  // The padding-right forces the element to have a 'border', which
  // is needed on Webkit to be able to get line-level bounding
  // rectangles for it (in measureChar).
  var content = eltP("span", null, null, webkit ? "padding-right: .1px" : null)
  var builder = {pre: eltP("pre", [content], "CodeMirror-line"), content: content,
                 col: 0, pos: 0, cm: cm,
                 trailingSpace: false,
                 splitSpaces: (ie || webkit) && cm.getOption("lineWrapping")}
  lineView.measure = {}

  // Iterate over the logical lines that make up this visual line.
  for (var i = 0; i <= (lineView.rest ? lineView.rest.length : 0); i++) {
    var line = i ? lineView.rest[i - 1] : lineView.line, order = (void 0)
    builder.pos = 0
    builder.addToken = buildToken
    // Optionally wire in some hacks into the token-rendering
    // algorithm, to deal with browser quirks.
    if (hasBadBidiRects(cm.display.measure) && (order = getOrder(line, cm.doc.direction)))
      { builder.addToken = buildTokenBadBidi(builder.addToken, order) }
    builder.map = []
    var allowFrontierUpdate = lineView != cm.display.externalMeasured && lineNo(line)
    insertLineContent(line, builder, getLineStyles(cm, line, allowFrontierUpdate))
    if (line.styleClasses) {
      if (line.styleClasses.bgClass)
        { builder.bgClass = joinClasses(line.styleClasses.bgClass, builder.bgClass || "") }
      if (line.styleClasses.textClass)
        { builder.textClass = joinClasses(line.styleClasses.textClass, builder.textClass || "") }
    }

    // Ensure at least a single node is present, for measuring.
    if (builder.map.length == 0)
      { builder.map.push(0, 0, builder.content.appendChild(zeroWidthElement(cm.display.measure))) }

    // Store the map and a cache object for the current logical line
    if (i == 0) {
      lineView.measure.map = builder.map
      lineView.measure.cache = {}
    } else {
      ;(lineView.measure.maps || (lineView.measure.maps = [])).push(builder.map)
      ;(lineView.measure.caches || (lineView.measure.caches = [])).push({})
    }
  }

  // See issue #2901
  if (webkit) {
    var last = builder.content.lastChild
    if (/\bcm-tab\b/.test(last.className) || (last.querySelector && last.querySelector(".cm-tab")))
      { builder.content.className = "cm-tab-wrap-hack" }
  }

  signal(cm, "renderLine", cm, lineView.line, builder.pre)
  if (builder.pre.className)
    { builder.textClass = joinClasses(builder.pre.className, builder.textClass || "") }

  return builder
}

function defaultSpecialCharPlaceholder(ch) {
  var token = elt("span", "\u2022", "cm-invalidchar")
  token.title = "\\u" + ch.charCodeAt(0).toString(16)
  token.setAttribute("aria-label", token.title)
  return token
}

// Build up the DOM representation for a single token, and add it to
// the line map. Takes care to render special characters separately.
function buildToken(builder, text, style, startStyle, endStyle, title, css) {
  if (!text) { return }
  var displayText = builder.splitSpaces ? splitSpaces(text, builder.trailingSpace) : text
  var special = builder.cm.state.specialChars, mustWrap = false
  var content
  if (!special.test(text)) {
    builder.col += text.length
    content = document.createTextNode(displayText)
    builder.map.push(builder.pos, builder.pos + text.length, content)
    if (ie && ie_version < 9) { mustWrap = true }
    builder.pos += text.length
  } else {
    content = document.createDocumentFragment()
    var pos = 0
    while (true) {
      special.lastIndex = pos
      var m = special.exec(text)
      var skipped = m ? m.index - pos : text.length - pos
      if (skipped) {
        var txt = document.createTextNode(displayText.slice(pos, pos + skipped))
        if (ie && ie_version < 9) { content.appendChild(elt("span", [txt])) }
        else { content.appendChild(txt) }
        builder.map.push(builder.pos, builder.pos + skipped, txt)
        builder.col += skipped
        builder.pos += skipped
      }
      if (!m) { break }
      pos += skipped + 1
      var txt$1 = (void 0)
      if (m[0] == "\t") {
        var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize
        txt$1 = content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"))
        txt$1.setAttribute("role", "presentation")
        txt$1.setAttribute("cm-text", "\t")
        builder.col += tabWidth
      } else if (m[0] == "\r" || m[0] == "\n") {
        txt$1 = content.appendChild(elt("span", m[0] == "\r" ? "\u240d" : "\u2424", "cm-invalidchar"))
        txt$1.setAttribute("cm-text", m[0])
        builder.col += 1
      } else {
        txt$1 = builder.cm.options.specialCharPlaceholder(m[0])
        txt$1.setAttribute("cm-text", m[0])
        if (ie && ie_version < 9) { content.appendChild(elt("span", [txt$1])) }
        else { content.appendChild(txt$1) }
        builder.col += 1
      }
      builder.map.push(builder.pos, builder.pos + 1, txt$1)
      builder.pos++
    }
  }
  builder.trailingSpace = displayText.charCodeAt(text.length - 1) == 32
  if (style || startStyle || endStyle || mustWrap || css) {
    var fullStyle = style || ""
    if (startStyle) { fullStyle += startStyle }
    if (endStyle) { fullStyle += endStyle }
    var token = elt("span", [content], fullStyle, css)
    if (title) { token.title = title }
    return builder.content.appendChild(token)
  }
  builder.content.appendChild(content)
}

function splitSpaces(text, trailingBefore) {
  if (text.length > 1 && !/  /.test(text)) { return text }
  var spaceBefore = trailingBefore, result = ""
  for (var i = 0; i < text.length; i++) {
    var ch = text.charAt(i)
    if (ch == " " && spaceBefore && (i == text.length - 1 || text.charCodeAt(i + 1) == 32))
      { ch = "\u00a0" }
    result += ch
    spaceBefore = ch == " "
  }
  return result
}

// Work around nonsense dimensions being reported for stretches of
// right-to-left text.
function buildTokenBadBidi(inner, order) {
  return function (builder, text, style, startStyle, endStyle, title, css) {
    style = style ? style + " cm-force-border" : "cm-force-border"
    var start = builder.pos, end = start + text.length
    for (;;) {
      // Find the part that overlaps with the start of this text
      var part = (void 0)
      for (var i = 0; i < order.length; i++) {
        part = order[i]
        if (part.to > start && part.from <= start) { break }
      }
      if (part.to >= end) { return inner(builder, text, style, startStyle, endStyle, title, css) }
      inner(builder, text.slice(0, part.to - start), style, startStyle, null, title, css)
      startStyle = null
      text = text.slice(part.to - start)
      start = part.to
    }
  }
}

function buildCollapsedSpan(builder, size, marker, ignoreWidget) {
  var widget = !ignoreWidget && marker.widgetNode
  if (widget) { builder.map.push(builder.pos, builder.pos + size, widget) }
  if (!ignoreWidget && builder.cm.display.input.needsContentAttribute) {
    if (!widget)
      { widget = builder.content.appendChild(document.createElement("span")) }
    widget.setAttribute("cm-marker", marker.id)
  }
  if (widget) {
    builder.cm.display.input.setUneditable(widget)
    builder.content.appendChild(widget)
  }
  builder.pos += size
  builder.trailingSpace = false
}

// Outputs a number of spans to make up a line, taking highlighting
// and marked text into account.
function insertLineContent(line, builder, styles) {
  var spans = line.markedSpans, allText = line.text, at = 0
  if (!spans) {
    for (var i$1 = 1; i$1 < styles.length; i$1+=2)
      { builder.addToken(builder, allText.slice(at, at = styles[i$1]), interpretTokenStyle(styles[i$1+1], builder.cm.options)) }
    return
  }

  var len = allText.length, pos = 0, i = 1, text = "", style, css
  var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, title, collapsed
  for (;;) {
    if (nextChange == pos) { // Update current marker set
      spanStyle = spanEndStyle = spanStartStyle = title = css = ""
      collapsed = null; nextChange = Infinity
      var foundBookmarks = [], endStyles = (void 0)
      for (var j = 0; j < spans.length; ++j) {
        var sp = spans[j], m = sp.marker
        if (m.type == "bookmark" && sp.from == pos && m.widgetNode) {
          foundBookmarks.push(m)
        } else if (sp.from <= pos && (sp.to == null || sp.to > pos || m.collapsed && sp.to == pos && sp.from == pos)) {
          if (sp.to != null && sp.to != pos && nextChange > sp.to) {
            nextChange = sp.to
            spanEndStyle = ""
          }
          if (m.className) { spanStyle += " " + m.className }
          if (m.css) { css = (css ? css + ";" : "") + m.css }
          if (m.startStyle && sp.from == pos) { spanStartStyle += " " + m.startStyle }
          if (m.endStyle && sp.to == nextChange) { (endStyles || (endStyles = [])).push(m.endStyle, sp.to) }
          if (m.title && !title) { title = m.title }
          if (m.collapsed && (!collapsed || compareCollapsedMarkers(collapsed.marker, m) < 0))
            { collapsed = sp }
        } else if (sp.from > pos && nextChange > sp.from) {
          nextChange = sp.from
        }
      }
      if (endStyles) { for (var j$1 = 0; j$1 < endStyles.length; j$1 += 2)
        { if (endStyles[j$1 + 1] == nextChange) { spanEndStyle += " " + endStyles[j$1] } } }

      if (!collapsed || collapsed.from == pos) { for (var j$2 = 0; j$2 < foundBookmarks.length; ++j$2)
        { buildCollapsedSpan(builder, 0, foundBookmarks[j$2]) } }
      if (collapsed && (collapsed.from || 0) == pos) {
        buildCollapsedSpan(builder, (collapsed.to == null ? len + 1 : collapsed.to) - pos,
                           collapsed.marker, collapsed.from == null)
        if (collapsed.to == null) { return }
        if (collapsed.to == pos) { collapsed = false }
      }
    }
    if (pos >= len) { break }

    var upto = Math.min(len, nextChange)
    while (true) {
      if (text) {
        var end = pos + text.length
        if (!collapsed) {
          var tokenText = end > upto ? text.slice(0, upto - pos) : text
          builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,
                           spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : "", title, css)
        }
        if (end >= upto) {text = text.slice(upto - pos); pos = upto; break}
        pos = end
        spanStartStyle = ""
      }
      text = allText.slice(at, at = styles[i++])
      style = interpretTokenStyle(styles[i++], builder.cm.options)
    }
  }
}


// These objects are used to represent the visible (currently drawn)
// part of the document. A LineView may correspond to multiple
// logical lines, if those are connected by collapsed ranges.
function LineView(doc, line, lineN) {
  // The starting line
  this.line = line
  // Continuing lines, if any
  this.rest = visualLineContinued(line)
  // Number of logical lines in this visual line
  this.size = this.rest ? lineNo(lst(this.rest)) - lineN + 1 : 1
  this.node = this.text = null
  this.hidden = lineIsHidden(doc, line)
}

// Create a range of LineView objects for the given lines.
function buildViewArray(cm, from, to) {
  var array = [], nextPos
  for (var pos = from; pos < to; pos = nextPos) {
    var view = new LineView(cm.doc, getLine(cm.doc, pos), pos)
    nextPos = pos + view.size
    array.push(view)
  }
  return array
}

var operationGroup = null

function pushOperation(op) {
  if (operationGroup) {
    operationGroup.ops.push(op)
  } else {
    op.ownsGroup = operationGroup = {
      ops: [op],
      delayedCallbacks: []
    }
  }
}

function fireCallbacksForOps(group) {
  // Calls delayed callbacks and cursorActivity handlers until no
  // new ones appear
  var callbacks = group.delayedCallbacks, i = 0
  do {
    for (; i < callbacks.length; i++)
      { callbacks[i].call(null) }
    for (var j = 0; j < group.ops.length; j++) {
      var op = group.ops[j]
      if (op.cursorActivityHandlers)
        { while (op.cursorActivityCalled < op.cursorActivityHandlers.length)
          { op.cursorActivityHandlers[op.cursorActivityCalled++].call(null, op.cm) } }
    }
  } while (i < callbacks.length)
}

function finishOperation(op, endCb) {
  var group = op.ownsGroup
  if (!group) { return }

  try { fireCallbacksForOps(group) }
  finally {
    operationGroup = null
    endCb(group)
  }
}

var orphanDelayedCallbacks = null

// Often, we want to signal events at a point where we are in the
// middle of some work, but don't want the handler to start calling
// other methods on the editor, which might be in an inconsistent
// state or simply not expect any other events to happen.
// signalLater looks whether there are any handlers, and schedules
// them to be executed when the last operation ends, or, if no
// operation is active, when a timeout fires.
function signalLater(emitter, type /*, values...*/) {
  var arr = getHandlers(emitter, type)
  if (!arr.length) { return }
  var args = Array.prototype.slice.call(arguments, 2), list
  if (operationGroup) {
    list = operationGroup.delayedCallbacks
  } else if (orphanDelayedCallbacks) {
    list = orphanDelayedCallbacks
  } else {
    list = orphanDelayedCallbacks = []
    setTimeout(fireOrphanDelayed, 0)
  }
  var loop = function ( i ) {
    list.push(function () { return arr[i].apply(null, args); })
  };

  for (var i = 0; i < arr.length; ++i)
    loop( i );
}

function fireOrphanDelayed() {
  var delayed = orphanDelayedCallbacks
  orphanDelayedCallbacks = null
  for (var i = 0; i < delayed.length; ++i) { delayed[i]() }
}

// When an aspect of a line changes, a string is added to
// lineView.changes. This updates the relevant part of the line's
// DOM structure.
function updateLineForChanges(cm, lineView, lineN, dims) {
  for (var j = 0; j < lineView.changes.length; j++) {
    var type = lineView.changes[j]
    if (type == "text") { updateLineText(cm, lineView) }
    else if (type == "gutter") { updateLineGutter(cm, lineView, lineN, dims) }
    else if (type == "class") { updateLineClasses(cm, lineView) }
    else if (type == "widget") { updateLineWidgets(cm, lineView, dims) }
  }
  lineView.changes = null
}

// Lines with gutter elements, widgets or a background class need to
// be wrapped, and have the extra elements added to the wrapper div
function ensureLineWrapped(lineView) {
  if (lineView.node == lineView.text) {
    lineView.node = elt("div", null, null, "position: relative")
    if (lineView.text.parentNode)
      { lineView.text.parentNode.replaceChild(lineView.node, lineView.text) }
    lineView.node.appendChild(lineView.text)
    if (ie && ie_version < 8) { lineView.node.style.zIndex = 2 }
  }
  return lineView.node
}

function updateLineBackground(cm, lineView) {
  var cls = lineView.bgClass ? lineView.bgClass + " " + (lineView.line.bgClass || "") : lineView.line.bgClass
  if (cls) { cls += " CodeMirror-linebackground" }
  if (lineView.background) {
    if (cls) { lineView.background.className = cls }
    else { lineView.background.parentNode.removeChild(lineView.background); lineView.background = null }
  } else if (cls) {
    var wrap = ensureLineWrapped(lineView)
    lineView.background = wrap.insertBefore(elt("div", null, cls), wrap.firstChild)
    cm.display.input.setUneditable(lineView.background)
  }
}

// Wrapper around buildLineContent which will reuse the structure
// in display.externalMeasured when possible.
function getLineContent(cm, lineView) {
  var ext = cm.display.externalMeasured
  if (ext && ext.line == lineView.line) {
    cm.display.externalMeasured = null
    lineView.measure = ext.measure
    return ext.built
  }
  return buildLineContent(cm, lineView)
}

// Redraw the line's text. Interacts with the background and text
// classes because the mode may output tokens that influence these
// classes.
function updateLineText(cm, lineView) {
  var cls = lineView.text.className
  var built = getLineContent(cm, lineView)
  if (lineView.text == lineView.node) { lineView.node = built.pre }
  lineView.text.parentNode.replaceChild(built.pre, lineView.text)
  lineView.text = built.pre
  if (built.bgClass != lineView.bgClass || built.textClass != lineView.textClass) {
    lineView.bgClass = built.bgClass
    lineView.textClass = built.textClass
    updateLineClasses(cm, lineView)
  } else if (cls) {
    lineView.text.className = cls
  }
}

function updateLineClasses(cm, lineView) {
  updateLineBackground(cm, lineView)
  if (lineView.line.wrapClass)
    { ensureLineWrapped(lineView).className = lineView.line.wrapClass }
  else if (lineView.node != lineView.text)
    { lineView.node.className = "" }
  var textClass = lineView.textClass ? lineView.textClass + " " + (lineView.line.textClass || "") : lineView.line.textClass
  lineView.text.className = textClass || ""
}

function updateLineGutter(cm, lineView, lineN, dims) {
  if (lineView.gutter) {
    lineView.node.removeChild(lineView.gutter)
    lineView.gutter = null
  }
  if (lineView.gutterBackground) {
    lineView.node.removeChild(lineView.gutterBackground)
    lineView.gutterBackground = null
  }
  if (lineView.line.gutterClass) {
    var wrap = ensureLineWrapped(lineView)
    lineView.gutterBackground = elt("div", null, "CodeMirror-gutter-background " + lineView.line.gutterClass,
                                    ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px; width: " + (dims.gutterTotalWidth) + "px"))
    cm.display.input.setUneditable(lineView.gutterBackground)
    wrap.insertBefore(lineView.gutterBackground, lineView.text)
  }
  var markers = lineView.line.gutterMarkers
  if (cm.options.lineNumbers || markers) {
    var wrap$1 = ensureLineWrapped(lineView)
    var gutterWrap = lineView.gutter = elt("div", null, "CodeMirror-gutter-wrapper", ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px"))
    cm.display.input.setUneditable(gutterWrap)
    wrap$1.insertBefore(gutterWrap, lineView.text)
    if (lineView.line.gutterClass)
      { gutterWrap.className += " " + lineView.line.gutterClass }
    if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"]))
      { lineView.lineNumber = gutterWrap.appendChild(
        elt("div", lineNumberFor(cm.options, lineN),
            "CodeMirror-linenumber CodeMirror-gutter-elt",
            ("left: " + (dims.gutterLeft["CodeMirror-linenumbers"]) + "px; width: " + (cm.display.lineNumInnerWidth) + "px"))) }
    if (markers) { for (var k = 0; k < cm.options.gutters.length; ++k) {
      var id = cm.options.gutters[k], found = markers.hasOwnProperty(id) && markers[id]
      if (found)
        { gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt",
                                   ("left: " + (dims.gutterLeft[id]) + "px; width: " + (dims.gutterWidth[id]) + "px"))) }
    } }
  }
}

function updateLineWidgets(cm, lineView, dims) {
  if (lineView.alignable) { lineView.alignable = null }
  for (var node = lineView.node.firstChild, next = (void 0); node; node = next) {
    next = node.nextSibling
    if (node.className == "CodeMirror-linewidget")
      { lineView.node.removeChild(node) }
  }
  insertLineWidgets(cm, lineView, dims)
}

// Build a line's DOM representation from scratch
function buildLineElement(cm, lineView, lineN, dims) {
  var built = getLineContent(cm, lineView)
  lineView.text = lineView.node = built.pre
  if (built.bgClass) { lineView.bgClass = built.bgClass }
  if (built.textClass) { lineView.textClass = built.textClass }

  updateLineClasses(cm, lineView)
  updateLineGutter(cm, lineView, lineN, dims)
  insertLineWidgets(cm, lineView, dims)
  return lineView.node
}

// A lineView may contain multiple logical lines (when merged by
// collapsed spans). The widgets for all of them need to be drawn.
function insertLineWidgets(cm, lineView, dims) {
  insertLineWidgetsFor(cm, lineView.line, lineView, dims, true)
  if (lineView.rest) { for (var i = 0; i < lineView.rest.length; i++)
    { insertLineWidgetsFor(cm, lineView.rest[i], lineView, dims, false) } }
}

function insertLineWidgetsFor(cm, line, lineView, dims, allowAbove) {
  if (!line.widgets) { return }
  var wrap = ensureLineWrapped(lineView)
  for (var i = 0, ws = line.widgets; i < ws.length; ++i) {
    var widget = ws[i], node = elt("div", [widget.node], "CodeMirror-linewidget")
    if (!widget.handleMouseEvents) { node.setAttribute("cm-ignore-events", "true") }
    positionLineWidget(widget, node, lineView, dims)
    cm.display.input.setUneditable(node)
    if (allowAbove && widget.above)
      { wrap.insertBefore(node, lineView.gutter || lineView.text) }
    else
      { wrap.appendChild(node) }
    signalLater(widget, "redraw")
  }
}

function positionLineWidget(widget, node, lineView, dims) {
  if (widget.noHScroll) {
    ;(lineView.alignable || (lineView.alignable = [])).push(node)
    var width = dims.wrapperWidth
    node.style.left = dims.fixedPos + "px"
    if (!widget.coverGutter) {
      width -= dims.gutterTotalWidth
      node.style.paddingLeft = dims.gutterTotalWidth + "px"
    }
    node.style.width = width + "px"
  }
  if (widget.coverGutter) {
    node.style.zIndex = 5
    node.style.position = "relative"
    if (!widget.noHScroll) { node.style.marginLeft = -dims.gutterTotalWidth + "px" }
  }
}

function widgetHeight(widget) {
  if (widget.height != null) { return widget.height }
  var cm = widget.doc.cm
  if (!cm) { return 0 }
  if (!contains(document.body, widget.node)) {
    var parentStyle = "position: relative;"
    if (widget.coverGutter)
      { parentStyle += "margin-left: -" + cm.display.gutters.offsetWidth + "px;" }
    if (widget.noHScroll)
      { parentStyle += "width: " + cm.display.wrapper.clientWidth + "px;" }
    removeChildrenAndAdd(cm.display.measure, elt("div", [widget.node], null, parentStyle))
  }
  return widget.height = widget.node.parentNode.offsetHeight
}

// Return true when the given mouse event happened in a widget
function eventInWidget(display, e) {
  for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {
    if (!n || (n.nodeType == 1 && n.getAttribute("cm-ignore-events") == "true") ||
        (n.parentNode == display.sizer && n != display.mover))
      { return true }
  }
}

// POSITION MEASUREMENT

function paddingTop(display) {return display.lineSpace.offsetTop}
function paddingVert(display) {return display.mover.offsetHeight - display.lineSpace.offsetHeight}
function paddingH(display) {
  if (display.cachedPaddingH) { return display.cachedPaddingH }
  var e = removeChildrenAndAdd(display.measure, elt("pre", "x"))
  var style = window.getComputedStyle ? window.getComputedStyle(e) : e.currentStyle
  var data = {left: parseInt(style.paddingLeft), right: parseInt(style.paddingRight)}
  if (!isNaN(data.left) && !isNaN(data.right)) { display.cachedPaddingH = data }
  return data
}

function scrollGap(cm) { return scrollerGap - cm.display.nativeBarWidth }
function displayWidth(cm) {
  return cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth
}
function displayHeight(cm) {
  return cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight
}

// Ensure the lineView.wrapping.heights array is populated. This is
// an array of bottom offsets for the lines that make up a drawn
// line. When lineWrapping is on, there might be more than one
// height.
function ensureLineHeights(cm, lineView, rect) {
  var wrapping = cm.options.lineWrapping
  var curWidth = wrapping && displayWidth(cm)
  if (!lineView.measure.heights || wrapping && lineView.measure.width != curWidth) {
    var heights = lineView.measure.heights = []
    if (wrapping) {
      lineView.measure.width = curWidth
      var rects = lineView.text.firstChild.getClientRects()
      for (var i = 0; i < rects.length - 1; i++) {
        var cur = rects[i], next = rects[i + 1]
        if (Math.abs(cur.bottom - next.bottom) > 2)
          { heights.push((cur.bottom + next.top) / 2 - rect.top) }
      }
    }
    heights.push(rect.bottom - rect.top)
  }
}

// Find a line map (mapping character offsets to text nodes) and a
// measurement cache for the given line number. (A line view might
// contain multiple lines when collapsed ranges are present.)
function mapFromLineView(lineView, line, lineN) {
  if (lineView.line == line)
    { return {map: lineView.measure.map, cache: lineView.measure.cache} }
  for (var i = 0; i < lineView.rest.length; i++)
    { if (lineView.rest[i] == line)
      { return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i]} } }
  for (var i$1 = 0; i$1 < lineView.rest.length; i$1++)
    { if (lineNo(lineView.rest[i$1]) > lineN)
      { return {map: lineView.measure.maps[i$1], cache: lineView.measure.caches[i$1], before: true} } }
}

// Render a line into the hidden node display.externalMeasured. Used
// when measurement is needed for a line that's not in the viewport.
function updateExternalMeasurement(cm, line) {
  line = visualLine(line)
  var lineN = lineNo(line)
  var view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN)
  view.lineN = lineN
  var built = view.built = buildLineContent(cm, view)
  view.text = built.pre
  removeChildrenAndAdd(cm.display.lineMeasure, built.pre)
  return view
}

// Get a {top, bottom, left, right} box (in line-local coordinates)
// for a given character.
function measureChar(cm, line, ch, bias) {
  return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias)
}

// Find a line view that corresponds to the given line number.
function findViewForLine(cm, lineN) {
  if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo)
    { return cm.display.view[findViewIndex(cm, lineN)] }
  var ext = cm.display.externalMeasured
  if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size)
    { return ext }
}

// Measurement can be split in two steps, the set-up work that
// applies to the whole line, and the measurement of the actual
// character. Functions like coordsChar, that need to do a lot of
// measurements in a row, can thus ensure that the set-up work is
// only done once.
function prepareMeasureForLine(cm, line) {
  var lineN = lineNo(line)
  var view = findViewForLine(cm, lineN)
  if (view && !view.text) {
    view = null
  } else if (view && view.changes) {
    updateLineForChanges(cm, view, lineN, getDimensions(cm))
    cm.curOp.forceUpdate = true
  }
  if (!view)
    { view = updateExternalMeasurement(cm, line) }

  var info = mapFromLineView(view, line, lineN)
  return {
    line: line, view: view, rect: null,
    map: info.map, cache: info.cache, before: info.before,
    hasHeights: false
  }
}

// Given a prepared measurement object, measures the position of an
// actual character (or fetches it from the cache).
function measureCharPrepared(cm, prepared, ch, bias, varHeight) {
  if (prepared.before) { ch = -1 }
  var key = ch + (bias || ""), found
  if (prepared.cache.hasOwnProperty(key)) {
    found = prepared.cache[key]
  } else {
    if (!prepared.rect)
      { prepared.rect = prepared.view.text.getBoundingClientRect() }
    if (!prepared.hasHeights) {
      ensureLineHeights(cm, prepared.view, prepared.rect)
      prepared.hasHeights = true
    }
    found = measureCharInner(cm, prepared, ch, bias)
    if (!found.bogus) { prepared.cache[key] = found }
  }
  return {left: found.left, right: found.right,
          top: varHeight ? found.rtop : found.top,
          bottom: varHeight ? found.rbottom : found.bottom}
}

var nullRect = {left: 0, right: 0, top: 0, bottom: 0}

function nodeAndOffsetInLineMap(map, ch, bias) {
  var node, start, end, collapse, mStart, mEnd
  // First, search the line map for the text node corresponding to,
  // or closest to, the target character.
  for (var i = 0; i < map.length; i += 3) {
    mStart = map[i]
    mEnd = map[i + 1]
    if (ch < mStart) {
      start = 0; end = 1
      collapse = "left"
    } else if (ch < mEnd) {
      start = ch - mStart
      end = start + 1
    } else if (i == map.length - 3 || ch == mEnd && map[i + 3] > ch) {
      end = mEnd - mStart
      start = end - 1
      if (ch >= mEnd) { collapse = "right" }
    }
    if (start != null) {
      node = map[i + 2]
      if (mStart == mEnd && bias == (node.insertLeft ? "left" : "right"))
        { collapse = bias }
      if (bias == "left" && start == 0)
        { while (i && map[i - 2] == map[i - 3] && map[i - 1].insertLeft) {
          node = map[(i -= 3) + 2]
          collapse = "left"
        } }
      if (bias == "right" && start == mEnd - mStart)
        { while (i < map.length - 3 && map[i + 3] == map[i + 4] && !map[i + 5].insertLeft) {
          node = map[(i += 3) + 2]
          collapse = "right"
        } }
      break
    }
  }
  return {node: node, start: start, end: end, collapse: collapse, coverStart: mStart, coverEnd: mEnd}
}

function getUsefulRect(rects, bias) {
  var rect = nullRect
  if (bias == "left") { for (var i = 0; i < rects.length; i++) {
    if ((rect = rects[i]).left != rect.right) { break }
  } } else { for (var i$1 = rects.length - 1; i$1 >= 0; i$1--) {
    if ((rect = rects[i$1]).left != rect.right) { break }
  } }
  return rect
}

function measureCharInner(cm, prepared, ch, bias) {
  var place = nodeAndOffsetInLineMap(prepared.map, ch, bias)
  var node = place.node, start = place.start, end = place.end, collapse = place.collapse

  var rect
  if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.
    for (var i$1 = 0; i$1 < 4; i$1++) { // Retry a maximum of 4 times when nonsense rectangles are returned
      while (start && isExtendingChar(prepared.line.text.charAt(place.coverStart + start))) { --start }
      while (place.coverStart + end < place.coverEnd && isExtendingChar(prepared.line.text.charAt(place.coverStart + end))) { ++end }
      if (ie && ie_version < 9 && start == 0 && end == place.coverEnd - place.coverStart)
        { rect = node.parentNode.getBoundingClientRect() }
      else
        { rect = getUsefulRect(range(node, start, end).getClientRects(), bias) }
      if (rect.left || rect.right || start == 0) { break }
      end = start
      start = start - 1
      collapse = "right"
    }
    if (ie && ie_version < 11) { rect = maybeUpdateRectForZooming(cm.display.measure, rect) }
  } else { // If it is a widget, simply get the box for the whole widget.
    if (start > 0) { collapse = bias = "right" }
    var rects
    if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1)
      { rect = rects[bias == "right" ? rects.length - 1 : 0] }
    else
      { rect = node.getBoundingClientRect() }
  }
  if (ie && ie_version < 9 && !start && (!rect || !rect.left && !rect.right)) {
    var rSpan = node.parentNode.getClientRects()[0]
    if (rSpan)
      { rect = {left: rSpan.left, right: rSpan.left + charWidth(cm.display), top: rSpan.top, bottom: rSpan.bottom} }
    else
      { rect = nullRect }
  }

  var rtop = rect.top - prepared.rect.top, rbot = rect.bottom - prepared.rect.top
  var mid = (rtop + rbot) / 2
  var heights = prepared.view.measure.heights
  var i = 0
  for (; i < heights.length - 1; i++)
    { if (mid < heights[i]) { break } }
  var top = i ? heights[i - 1] : 0, bot = heights[i]
  var result = {left: (collapse == "right" ? rect.right : rect.left) - prepared.rect.left,
                right: (collapse == "left" ? rect.left : rect.right) - prepared.rect.left,
                top: top, bottom: bot}
  if (!rect.left && !rect.right) { result.bogus = true }
  if (!cm.options.singleCursorHeightPerLine) { result.rtop = rtop; result.rbottom = rbot }

  return result
}

// Work around problem with bounding client rects on ranges being
// returned incorrectly when zoomed on IE10 and below.
function maybeUpdateRectForZooming(measure, rect) {
  if (!window.screen || screen.logicalXDPI == null ||
      screen.logicalXDPI == screen.deviceXDPI || !hasBadZoomedRects(measure))
    { return rect }
  var scaleX = screen.logicalXDPI / screen.deviceXDPI
  var scaleY = screen.logicalYDPI / screen.deviceYDPI
  return {left: rect.left * scaleX, right: rect.right * scaleX,
          top: rect.top * scaleY, bottom: rect.bottom * scaleY}
}

function clearLineMeasurementCacheFor(lineView) {
  if (lineView.measure) {
    lineView.measure.cache = {}
    lineView.measure.heights = null
    if (lineView.rest) { for (var i = 0; i < lineView.rest.length; i++)
      { lineView.measure.caches[i] = {} } }
  }
}

function clearLineMeasurementCache(cm) {
  cm.display.externalMeasure = null
  removeChildren(cm.display.lineMeasure)
  for (var i = 0; i < cm.display.view.length; i++)
    { clearLineMeasurementCacheFor(cm.display.view[i]) }
}

function clearCaches(cm) {
  clearLineMeasurementCache(cm)
  cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = null
  if (!cm.options.lineWrapping) { cm.display.maxLineChanged = true }
  cm.display.lineNumChars = null
}

function pageScrollX() {
  // Work around https://bugs.chromium.org/p/chromium/issues/detail?id=489206
  // which causes page_Offset and bounding client rects to use
  // different reference viewports and invalidate our calculations.
  if (chrome && android) { return -(document.body.getBoundingClientRect().left - parseInt(getComputedStyle(document.body).marginLeft)) }
  return window.pageXOffset || (document.documentElement || document.body).scrollLeft
}
function pageScrollY() {
  if (chrome && android) { return -(document.body.getBoundingClientRect().top - parseInt(getComputedStyle(document.body).marginTop)) }
  return window.pageYOffset || (document.documentElement || document.body).scrollTop
}

function widgetTopHeight(lineObj) {
  var height = 0
  if (lineObj.widgets) { for (var i = 0; i < lineObj.widgets.length; ++i) { if (lineObj.widgets[i].above)
    { height += widgetHeight(lineObj.widgets[i]) } } }
  return height
}

// Converts a {top, bottom, left, right} box from line-local
// coordinates into another coordinate system. Context may be one of
// "line", "div" (display.lineDiv), "local"./null (editor), "window",
// or "page".
function intoCoordSystem(cm, lineObj, rect, context, includeWidgets) {
  if (!includeWidgets) {
    var height = widgetTopHeight(lineObj)
    rect.top += height; rect.bottom += height
  }
  if (context == "line") { return rect }
  if (!context) { context = "local" }
  var yOff = heightAtLine(lineObj)
  if (context == "local") { yOff += paddingTop(cm.display) }
  else { yOff -= cm.display.viewOffset }
  if (context == "page" || context == "window") {
    var lOff = cm.display.lineSpace.getBoundingClientRect()
    yOff += lOff.top + (context == "window" ? 0 : pageScrollY())
    var xOff = lOff.left + (context == "window" ? 0 : pageScrollX())
    rect.left += xOff; rect.right += xOff
  }
  rect.top += yOff; rect.bottom += yOff
  return rect
}

// Coverts a box from "div" coords to another coordinate system.
// Context may be "window", "page", "div", or "local"./null.
function fromCoordSystem(cm, coords, context) {
  if (context == "div") { return coords }
  var left = coords.left, top = coords.top
  // First move into "page" coordinate system
  if (context == "page") {
    left -= pageScrollX()
    top -= pageScrollY()
  } else if (context == "local" || !context) {
    var localBox = cm.display.sizer.getBoundingClientRect()
    left += localBox.left
    top += localBox.top
  }

  var lineSpaceBox = cm.display.lineSpace.getBoundingClientRect()
  return {left: left - lineSpaceBox.left, top: top - lineSpaceBox.top}
}

function charCoords(cm, pos, context, lineObj, bias) {
  if (!lineObj) { lineObj = getLine(cm.doc, pos.line) }
  return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, bias), context)
}

// Returns a box for a given cursor position, which may have an
// 'other' property containing the position of the secondary cursor
// on a bidi boundary.
// A cursor Pos(line, char, "before") is on the same visual line as `char - 1`
// and after `char - 1` in writing order of `char - 1`
// A cursor Pos(line, char, "after") is on the same visual line as `char`
// and before `char` in writing order of `char`
// Examples (upper-case letters are RTL, lower-case are LTR):
//     Pos(0, 1, ...)
//     before   after
// ab     a|b     a|b
// aB     a|B     aB|
// Ab     |Ab     A|b
// AB     B|A     B|A
// Every position after the last character on a line is considered to stick
// to the last character on the line.
function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {
  lineObj = lineObj || getLine(cm.doc, pos.line)
  if (!preparedMeasure) { preparedMeasure = prepareMeasureForLine(cm, lineObj) }
  function get(ch, right) {
    var m = measureCharPrepared(cm, preparedMeasure, ch, right ? "right" : "left", varHeight)
    if (right) { m.left = m.right; } else { m.right = m.left }
    return intoCoordSystem(cm, lineObj, m, context)
  }
  var order = getOrder(lineObj, cm.doc.direction), ch = pos.ch, sticky = pos.sticky
  if (ch >= lineObj.text.length) {
    ch = lineObj.text.length
    sticky = "before"
  } else if (ch <= 0) {
    ch = 0
    sticky = "after"
  }
  if (!order) { return get(sticky == "before" ? ch - 1 : ch, sticky == "before") }

  function getBidi(ch, partPos, invert) {
    var part = order[partPos], right = part.level == 1
    return get(invert ? ch - 1 : ch, right != invert)
  }
  var partPos = getBidiPartAt(order, ch, sticky)
  var other = bidiOther
  var val = getBidi(ch, partPos, sticky == "before")
  if (other != null) { val.other = getBidi(ch, other, sticky != "before") }
  return val
}

// Used to cheaply estimate the coordinates for a position. Used for
// intermediate scroll updates.
function estimateCoords(cm, pos) {
  var left = 0
  pos = clipPos(cm.doc, pos)
  if (!cm.options.lineWrapping) { left = charWidth(cm.display) * pos.ch }
  var lineObj = getLine(cm.doc, pos.line)
  var top = heightAtLine(lineObj) + paddingTop(cm.display)
  return {left: left, right: left, top: top, bottom: top + lineObj.height}
}

// Positions returned by coordsChar contain some extra information.
// xRel is the relative x position of the input coordinates compared
// to the found position (so xRel > 0 means the coordinates are to
// the right of the character position, for example). When outside
// is true, that means the coordinates lie outside the line's
// vertical range.
function PosWithInfo(line, ch, sticky, outside, xRel) {
  var pos = Pos(line, ch, sticky)
  pos.xRel = xRel
  if (outside) { pos.outside = true }
  return pos
}

// Compute the character position closest to the given coordinates.
// Input must be lineSpace-local ("div" coordinate system).
function coordsChar(cm, x, y) {
  var doc = cm.doc
  y += cm.display.viewOffset
  if (y < 0) { return PosWithInfo(doc.first, 0, null, true, -1) }
  var lineN = lineAtHeight(doc, y), last = doc.first + doc.size - 1
  if (lineN > last)
    { return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, null, true, 1) }
  if (x < 0) { x = 0 }

  var lineObj = getLine(doc, lineN)
  for (;;) {
    var found = coordsCharInner(cm, lineObj, lineN, x, y)
    var merged = collapsedSpanAtEnd(lineObj)
    var mergedPos = merged && merged.find(0, true)
    if (merged && (found.ch > mergedPos.from.ch || found.ch == mergedPos.from.ch && found.xRel > 0))
      { lineN = lineNo(lineObj = mergedPos.to.line) }
    else
      { return found }
  }
}

function wrappedLineExtent(cm, lineObj, preparedMeasure, y) {
  y -= widgetTopHeight(lineObj)
  var end = lineObj.text.length
  var begin = findFirst(function (ch) { return measureCharPrepared(cm, preparedMeasure, ch - 1).bottom <= y; }, end, 0)
  end = findFirst(function (ch) { return measureCharPrepared(cm, preparedMeasure, ch).top > y; }, begin, end)
  return {begin: begin, end: end}
}

function wrappedLineExtentChar(cm, lineObj, preparedMeasure, target) {
  if (!preparedMeasure) { preparedMeasure = prepareMeasureForLine(cm, lineObj) }
  var targetTop = intoCoordSystem(cm, lineObj, measureCharPrepared(cm, preparedMeasure, target), "line").top
  return wrappedLineExtent(cm, lineObj, preparedMeasure, targetTop)
}

// Returns true if the given side of a box is after the given
// coordinates, in top-to-bottom, left-to-right order.
function boxIsAfter(box, x, y, left) {
  return box.bottom <= y ? false : box.top > y ? true : (left ? box.left : box.right) > x
}

function coordsCharInner(cm, lineObj, lineNo, x, y) {
  // Move y into line-local coordinate space
  y -= heightAtLine(lineObj)
  var preparedMeasure = prepareMeasureForLine(cm, lineObj)
  // When directly calling `measureCharPrepared`, we have to adjust
  // for the widgets at this line.
  var widgetHeight = widgetTopHeight(lineObj)
  var begin = 0, end = lineObj.text.length, ltr = true

  var order = getOrder(lineObj, cm.doc.direction)
  // If the line isn't plain left-to-right text, first figure out
  // which bidi section the coordinates fall into.
  if (order) {
    var part = (cm.options.lineWrapping ? coordsBidiPartWrapped : coordsBidiPart)
                 (cm, lineObj, lineNo, preparedMeasure, order, x, y)
    ltr = part.level != 1
    // The awkward -1 offsets are needed because findFirst (called
    // on these below) will treat its first bound as inclusive,
    // second as exclusive, but we want to actually address the
    // characters in the part's range
    begin = ltr ? part.from : part.to - 1
    end = ltr ? part.to : part.from - 1
  }

  // A binary search to find the first character whose bounding box
  // starts after the coordinates. If we run across any whose box wrap
  // the coordinates, store that.
  var chAround = null, boxAround = null
  var ch = findFirst(function (ch) {
    var box = measureCharPrepared(cm, preparedMeasure, ch)
    box.top += widgetHeight; box.bottom += widgetHeight
    if (!boxIsAfter(box, x, y, false)) { return false }
    if (box.top <= y && box.left <= x) {
      chAround = ch
      boxAround = box
    }
    return true
  }, begin, end)

  var baseX, sticky, outside = false
  // If a box around the coordinates was found, use that
  if (boxAround) {
    // Distinguish coordinates nearer to the left or right side of the box
    var atLeft = x - boxAround.left < boxAround.right - x, atStart = atLeft == ltr
    ch = chAround + (atStart ? 0 : 1)
    sticky = atStart ? "after" : "before"
    baseX = atLeft ? boxAround.left : boxAround.right
  } else {
    // (Adjust for extended bound, if necessary.)
    if (!ltr && (ch == end || ch == begin)) { ch++ }
    // To determine which side to associate with, get the box to the
    // left of the character and compare it's vertical position to the
    // coordinates
    sticky = ch == 0 ? "after" : ch == lineObj.text.length ? "before" :
      (measureCharPrepared(cm, preparedMeasure, ch - (ltr ? 1 : 0)).bottom + widgetHeight <= y) == ltr ?
      "after" : "before"
    // Now get accurate coordinates for this place, in order to get a
    // base X position
    var coords = cursorCoords(cm, Pos(lineNo, ch, sticky), "line", lineObj, preparedMeasure)
    baseX = coords.left
    outside = y < coords.top || y >= coords.bottom
  }

  ch = skipExtendingChars(lineObj.text, ch, 1)
  return PosWithInfo(lineNo, ch, sticky, outside, x - baseX)
}

function coordsBidiPart(cm, lineObj, lineNo, preparedMeasure, order, x, y) {
  // Bidi parts are sorted left-to-right, and in a non-line-wrapping
  // situation, we can take this ordering to correspond to the visual
  // ordering. This finds the first part whose end is after the given
  // coordinates.
  var index = findFirst(function (i) {
    var part = order[i], ltr = part.level != 1
    return boxIsAfter(cursorCoords(cm, Pos(lineNo, ltr ? part.to : part.from, ltr ? "before" : "after"),
                                   "line", lineObj, preparedMeasure), x, y, true)
  }, 0, order.length - 1)
  var part = order[index]
  // If this isn't the first part, the part's start is also after
  // the coordinates, and the coordinates aren't on the same line as
  // that start, move one part back.
  if (index > 0) {
    var ltr = part.level != 1
    var start = cursorCoords(cm, Pos(lineNo, ltr ? part.from : part.to, ltr ? "after" : "before"),
                             "line", lineObj, preparedMeasure)
    if (boxIsAfter(start, x, y, true) && start.top > y)
      { part = order[index - 1] }
  }
  return part
}

function coordsBidiPartWrapped(cm, lineObj, _lineNo, preparedMeasure, order, x, y) {
  // In a wrapped line, rtl text on wrapping boundaries can do things
  // that don't correspond to the ordering in our `order` array at
  // all, so a binary search doesn't work, and we want to return a
  // part that only spans one line so that the binary search in
  // coordsCharInner is safe. As such, we first find the extent of the
  // wrapped line, and then do a flat search in which we discard any
  // spans that aren't on the line.
  var ref = wrappedLineExtent(cm, lineObj, preparedMeasure, y);
  var begin = ref.begin;
  var end = ref.end;
  if (/\s/.test(lineObj.text.charAt(end - 1))) { end-- }
  var part = null, closestDist = null
  for (var i = 0; i < order.length; i++) {
    var p = order[i]
    if (p.from >= end || p.to <= begin) { continue }
    var ltr = p.level != 1
    var endX = measureCharPrepared(cm, preparedMeasure, ltr ? Math.min(end, p.to) - 1 : Math.max(begin, p.from)).right
    // Weigh against spans ending before this, so that they are only
    // picked if nothing ends after
    var dist = endX < x ? x - endX + 1e9 : endX - x
    if (!part || closestDist > dist) {
      part = p
      closestDist = dist
    }
  }
  if (!part) { part = order[order.length - 1] }
  // Clip the part to the wrapped line.
  if (part.from < begin) { part = {from: begin, to: part.to, level: part.level} }
  if (part.to > end) { part = {from: part.from, to: end, level: part.level} }
  return part
}

var measureText
// Compute the default text height.
function textHeight(display) {
  if (display.cachedTextHeight != null) { return display.cachedTextHeight }
  if (measureText == null) {
    measureText = elt("pre")
    // Measure a bunch of lines, for browsers that compute
    // fractional heights.
    for (var i = 0; i < 49; ++i) {
      measureText.appendChild(document.createTextNode("x"))
      measureText.appendChild(elt("br"))
    }
    measureText.appendChild(document.createTextNode("x"))
  }
  removeChildrenAndAdd(display.measure, measureText)
  var height = measureText.offsetHeight / 50
  if (height > 3) { display.cachedTextHeight = height }
  removeChildren(display.measure)
  return height || 1
}

// Compute the default character width.
function charWidth(display) {
  if (display.cachedCharWidth != null) { return display.cachedCharWidth }
  var anchor = elt("span", "xxxxxxxxxx")
  var pre = elt("pre", [anchor])
  removeChildrenAndAdd(display.measure, pre)
  var rect = anchor.getBoundingClientRect(), width = (rect.right - rect.left) / 10
  if (width > 2) { display.cachedCharWidth = width }
  return width || 10
}

// Do a bulk-read of the DOM positions and sizes needed to draw the
// view, so that we don't interleave reading and writing to the DOM.
function getDimensions(cm) {
  var d = cm.display, left = {}, width = {}
  var gutterLeft = d.gutters.clientLeft
  for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
    left[cm.options.gutters[i]] = n.offsetLeft + n.clientLeft + gutterLeft
    width[cm.options.gutters[i]] = n.clientWidth
  }
  return {fixedPos: compensateForHScroll(d),
          gutterTotalWidth: d.gutters.offsetWidth,
          gutterLeft: left,
          gutterWidth: width,
          wrapperWidth: d.wrapper.clientWidth}
}

// Computes display.scroller.scrollLeft + display.gutters.offsetWidth,
// but using getBoundingClientRect to get a sub-pixel-accurate
// result.
function compensateForHScroll(display) {
  return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left
}

// Returns a function that estimates the height of a line, to use as
// first approximation until the line becomes visible (and is thus
// properly measurable).
function estimateHeight(cm) {
  var th = textHeight(cm.display), wrapping = cm.options.lineWrapping
  var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3)
  return function (line) {
    if (lineIsHidden(cm.doc, line)) { return 0 }

    var widgetsHeight = 0
    if (line.widgets) { for (var i = 0; i < line.widgets.length; i++) {
      if (line.widgets[i].height) { widgetsHeight += line.widgets[i].height }
    } }

    if (wrapping)
      { return widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th }
    else
      { return widgetsHeight + th }
  }
}

function estimateLineHeights(cm) {
  var doc = cm.doc, est = estimateHeight(cm)
  doc.iter(function (line) {
    var estHeight = est(line)
    if (estHeight != line.height) { updateLineHeight(line, estHeight) }
  })
}

// Given a mouse event, find the corresponding position. If liberal
// is false, it checks whether a gutter or scrollbar was clicked,
// and returns null if it was. forRect is used by rectangular
// selections, and tries to estimate a character position even for
// coordinates beyond the right of the text.
function posFromMouse(cm, e, liberal, forRect) {
  var display = cm.display
  if (!liberal && e_target(e).getAttribute("cm-not-content") == "true") { return null }

  var x, y, space = display.lineSpace.getBoundingClientRect()
  // Fails unpredictably on IE[67] when mouse is dragged around quickly.
  try { x = e.clientX - space.left; y = e.clientY - space.top }
  catch (e) { return null }
  var coords = coordsChar(cm, x, y), line
  if (forRect && coords.xRel == 1 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {
    var colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length
    coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff))
  }
  return coords
}

// Find the view element corresponding to a given line. Return null
// when the line isn't visible.
function findViewIndex(cm, n) {
  if (n >= cm.display.viewTo) { return null }
  n -= cm.display.viewFrom
  if (n < 0) { return null }
  var view = cm.display.view
  for (var i = 0; i < view.length; i++) {
    n -= view[i].size
    if (n < 0) { return i }
  }
}

function updateSelection(cm) {
  cm.display.input.showSelection(cm.display.input.prepareSelection())
}

function prepareSelection(cm, primary) {
  if ( primary === void 0 ) primary = true;

  var doc = cm.doc, result = {}
  var curFragment = result.cursors = document.createDocumentFragment()
  var selFragment = result.selection = document.createDocumentFragment()

  for (var i = 0; i < doc.sel.ranges.length; i++) {
    if (!primary && i == doc.sel.primIndex) { continue }
    var range = doc.sel.ranges[i]
    if (range.from().line >= cm.display.viewTo || range.to().line < cm.display.viewFrom) { continue }
    var collapsed = range.empty()
    if (collapsed || cm.options.showCursorWhenSelecting)
      { drawSelectionCursor(cm, range.head, curFragment) }
    if (!collapsed)
      { drawSelectionRange(cm, range, selFragment) }
  }
  return result
}

// Draws a cursor for the given range
function drawSelectionCursor(cm, head, output) {
  var pos = cursorCoords(cm, head, "div", null, null, !cm.options.singleCursorHeightPerLine)

  var cursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor"))
  cursor.style.left = pos.left + "px"
  cursor.style.top = pos.top + "px"
  cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px"

  if (pos.other) {
    // Secondary cursor, shown when on a 'jump' in bi-directional text
    var otherCursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor"))
    otherCursor.style.display = ""
    otherCursor.style.left = pos.other.left + "px"
    otherCursor.style.top = pos.other.top + "px"
    otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px"
  }
}

function cmpCoords(a, b) { return a.top - b.top || a.left - b.left }

// Draws the given range as a highlighted selection
function drawSelectionRange(cm, range, output) {
  var display = cm.display, doc = cm.doc
  var fragment = document.createDocumentFragment()
  var padding = paddingH(cm.display), leftSide = padding.left
  var rightSide = Math.max(display.sizerWidth, displayWidth(cm) - display.sizer.offsetLeft) - padding.right
  var docLTR = doc.direction == "ltr"

  function add(left, top, width, bottom) {
    if (top < 0) { top = 0 }
    top = Math.round(top)
    bottom = Math.round(bottom)
    fragment.appendChild(elt("div", null, "CodeMirror-selected", ("position: absolute; left: " + left + "px;\n                             top: " + top + "px; width: " + (width == null ? rightSide - left : width) + "px;\n                             height: " + (bottom - top) + "px")))
  }

  function drawForLine(line, fromArg, toArg) {
    var lineObj = getLine(doc, line)
    var lineLen = lineObj.text.length
    var start, end
    function coords(ch, bias) {
      return charCoords(cm, Pos(line, ch), "div", lineObj, bias)
    }

    function wrapX(pos, dir, side) {
      var extent = wrappedLineExtentChar(cm, lineObj, null, pos)
      var prop = (dir == "ltr") == (side == "after") ? "left" : "right"
      var ch = side == "after" ? extent.begin : extent.end - (/\s/.test(lineObj.text.charAt(extent.end - 1)) ? 2 : 1)
      return coords(ch, prop)[prop]
    }

    var order = getOrder(lineObj, doc.direction)
    iterateBidiSections(order, fromArg || 0, toArg == null ? lineLen : toArg, function (from, to, dir, i) {
      var ltr = dir == "ltr"
      var fromPos = coords(from, ltr ? "left" : "right")
      var toPos = coords(to - 1, ltr ? "right" : "left")

      var openStart = fromArg == null && from == 0, openEnd = toArg == null && to == lineLen
      var first = i == 0, last = !order || i == order.length - 1
      if (toPos.top - fromPos.top <= 3) { // Single line
        var openLeft = (docLTR ? openStart : openEnd) && first
        var openRight = (docLTR ? openEnd : openStart) && last
        var left = openLeft ? leftSide : (ltr ? fromPos : toPos).left
        var right = openRight ? rightSide : (ltr ? toPos : fromPos).right
        add(left, fromPos.top, right - left, fromPos.bottom)
      } else { // Multiple lines
        var topLeft, topRight, botLeft, botRight
        if (ltr) {
          topLeft = docLTR && openStart && first ? leftSide : fromPos.left
          topRight = docLTR ? rightSide : wrapX(from, dir, "before")
          botLeft = docLTR ? leftSide : wrapX(to, dir, "after")
          botRight = docLTR && openEnd && last ? rightSide : toPos.right
        } else {
          topLeft = !docLTR ? leftSide : wrapX(from, dir, "before")
          topRight = !docLTR && openStart && first ? rightSide : fromPos.right
          botLeft = !docLTR && openEnd && last ? leftSide : toPos.left
          botRight = !docLTR ? rightSide : wrapX(to, dir, "after")
        }
        add(topLeft, fromPos.top, topRight - topLeft, fromPos.bottom)
        if (fromPos.bottom < toPos.top) { add(leftSide, fromPos.bottom, null, toPos.top) }
        add(botLeft, toPos.top, botRight - botLeft, toPos.bottom)
      }

      if (!start || cmpCoords(fromPos, start) < 0) { start = fromPos }
      if (cmpCoords(toPos, start) < 0) { start = toPos }
      if (!end || cmpCoords(fromPos, end) < 0) { end = fromPos }
      if (cmpCoords(toPos, end) < 0) { end = toPos }
    })
    return {start: start, end: end}
  }

  var sFrom = range.from(), sTo = range.to()
  if (sFrom.line == sTo.line) {
    drawForLine(sFrom.line, sFrom.ch, sTo.ch)
  } else {
    var fromLine = getLine(doc, sFrom.line), toLine = getLine(doc, sTo.line)
    var singleVLine = visualLine(fromLine) == visualLine(toLine)
    var leftEnd = drawForLine(sFrom.line, sFrom.ch, singleVLine ? fromLine.text.length + 1 : null).end
    var rightStart = drawForLine(sTo.line, singleVLine ? 0 : null, sTo.ch).start
    if (singleVLine) {
      if (leftEnd.top < rightStart.top - 2) {
        add(leftEnd.right, leftEnd.top, null, leftEnd.bottom)
        add(leftSide, rightStart.top, rightStart.left, rightStart.bottom)
      } else {
        add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom)
      }
    }
    if (leftEnd.bottom < rightStart.top)
      { add(leftSide, leftEnd.bottom, null, rightStart.top) }
  }

  output.appendChild(fragment)
}

// Cursor-blinking
function restartBlink(cm) {
  if (!cm.state.focused) { return }
  var display = cm.display
  clearInterval(display.blinker)
  var on = true
  display.cursorDiv.style.visibility = ""
  if (cm.options.cursorBlinkRate > 0)
    { display.blinker = setInterval(function () { return display.cursorDiv.style.visibility = (on = !on) ? "" : "hidden"; },
      cm.options.cursorBlinkRate) }
  else if (cm.options.cursorBlinkRate < 0)
    { display.cursorDiv.style.visibility = "hidden" }
}

function ensureFocus(cm) {
  if (!cm.state.focused) { cm.display.input.focus(); onFocus(cm) }
}

function delayBlurEvent(cm) {
  cm.state.delayingBlurEvent = true
  setTimeout(function () { if (cm.state.delayingBlurEvent) {
    cm.state.delayingBlurEvent = false
    onBlur(cm)
  } }, 100)
}

function onFocus(cm, e) {
  if (cm.state.delayingBlurEvent) { cm.state.delayingBlurEvent = false }

  if (cm.options.readOnly == "nocursor") { return }
  if (!cm.state.focused) {
    signal(cm, "focus", cm, e)
    cm.state.focused = true
    addClass(cm.display.wrapper, "CodeMirror-focused")
    // This test prevents this from firing when a context
    // menu is closed (since the input reset would kill the
    // select-all detection hack)
    if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {
      cm.display.input.reset()
      if (webkit) { setTimeout(function () { return cm.display.input.reset(true); }, 20) } // Issue #1730
    }
    cm.display.input.receivedFocus()
  }
  restartBlink(cm)
}
function onBlur(cm, e) {
  if (cm.state.delayingBlurEvent) { return }

  if (cm.state.focused) {
    signal(cm, "blur", cm, e)
    cm.state.focused = false
    rmClass(cm.display.wrapper, "CodeMirror-focused")
  }
  clearInterval(cm.display.blinker)
  setTimeout(function () { if (!cm.state.focused) { cm.display.shift = false } }, 150)
}

// Read the actual heights of the rendered lines, and update their
// stored heights to match.
function updateHeightsInViewport(cm) {
  var display = cm.display
  var prevBottom = display.lineDiv.offsetTop
  for (var i = 0; i < display.view.length; i++) {
    var cur = display.view[i], height = (void 0)
    if (cur.hidden) { continue }
    if (ie && ie_version < 8) {
      var bot = cur.node.offsetTop + cur.node.offsetHeight
      height = bot - prevBottom
      prevBottom = bot
    } else {
      var box = cur.node.getBoundingClientRect()
      height = box.bottom - box.top
    }
    var diff = cur.line.height - height
    if (height < 2) { height = textHeight(display) }
    if (diff > .005 || diff < -.005) {
      updateLineHeight(cur.line, height)
      updateWidgetHeight(cur.line)
      if (cur.rest) { for (var j = 0; j < cur.rest.length; j++)
        { updateWidgetHeight(cur.rest[j]) } }
    }
  }
}

// Read and store the height of line widgets associated with the
// given line.
function updateWidgetHeight(line) {
  if (line.widgets) { for (var i = 0; i < line.widgets.length; ++i) {
    var w = line.widgets[i], parent = w.node.parentNode
    if (parent) { w.height = parent.offsetHeight }
  } }
}

// Compute the lines that are visible in a given viewport (defaults
// the the current scroll position). viewport may contain top,
// height, and ensure (see op.scrollToPos) properties.
function visibleLines(display, doc, viewport) {
  var top = viewport && viewport.top != null ? Math.max(0, viewport.top) : display.scroller.scrollTop
  top = Math.floor(top - paddingTop(display))
  var bottom = viewport && viewport.bottom != null ? viewport.bottom : top + display.wrapper.clientHeight

  var from = lineAtHeight(doc, top), to = lineAtHeight(doc, bottom)
  // Ensure is a {from: {line, ch}, to: {line, ch}} object, and
  // forces those lines into the viewport (if possible).
  if (viewport && viewport.ensure) {
    var ensureFrom = viewport.ensure.from.line, ensureTo = viewport.ensure.to.line
    if (ensureFrom < from) {
      from = ensureFrom
      to = lineAtHeight(doc, heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight)
    } else if (Math.min(ensureTo, doc.lastLine()) >= to) {
      from = lineAtHeight(doc, heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight)
      to = ensureTo
    }
  }
  return {from: from, to: Math.max(to, from + 1)}
}

// Re-align line numbers and gutter marks to compensate for
// horizontal scrolling.
function alignHorizontally(cm) {
  var display = cm.display, view = display.view
  if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) { return }
  var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft
  var gutterW = display.gutters.offsetWidth, left = comp + "px"
  for (var i = 0; i < view.length; i++) { if (!view[i].hidden) {
    if (cm.options.fixedGutter) {
      if (view[i].gutter)
        { view[i].gutter.style.left = left }
      if (view[i].gutterBackground)
        { view[i].gutterBackground.style.left = left }
    }
    var align = view[i].alignable
    if (align) { for (var j = 0; j < align.length; j++)
      { align[j].style.left = left } }
  } }
  if (cm.options.fixedGutter)
    { display.gutters.style.left = (comp + gutterW) + "px" }
}

// Used to ensure that the line number gutter is still the right
// size for the current document size. Returns true when an update
// is needed.
function maybeUpdateLineNumberWidth(cm) {
  if (!cm.options.lineNumbers) { return false }
  var doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display
  if (last.length != display.lineNumChars) {
    var test = display.measure.appendChild(elt("div", [elt("div", last)],
                                               "CodeMirror-linenumber CodeMirror-gutter-elt"))
    var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW
    display.lineGutter.style.width = ""
    display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding) + 1
    display.lineNumWidth = display.lineNumInnerWidth + padding
    display.lineNumChars = display.lineNumInnerWidth ? last.length : -1
    display.lineGutter.style.width = display.lineNumWidth + "px"
    updateGutterSpace(cm)
    return true
  }
  return false
}

// SCROLLING THINGS INTO VIEW

// If an editor sits on the top or bottom of the window, partially
// scrolled out of view, this ensures that the cursor is visible.
function maybeScrollWindow(cm, rect) {
  if (signalDOMEvent(cm, "scrollCursorIntoView")) { return }

  var display = cm.display, box = display.sizer.getBoundingClientRect(), doScroll = null
  if (rect.top + box.top < 0) { doScroll = true }
  else if (rect.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) { doScroll = false }
  if (doScroll != null && !phantom) {
    var scrollNode = elt("div", "\u200b", null, ("position: absolute;\n                         top: " + (rect.top - display.viewOffset - paddingTop(cm.display)) + "px;\n                         height: " + (rect.bottom - rect.top + scrollGap(cm) + display.barHeight) + "px;\n                         left: " + (rect.left) + "px; width: " + (Math.max(2, rect.right - rect.left)) + "px;"))
    cm.display.lineSpace.appendChild(scrollNode)
    scrollNode.scrollIntoView(doScroll)
    cm.display.lineSpace.removeChild(scrollNode)
  }
}

// Scroll a given position into view (immediately), verifying that
// it actually became visible (as line heights are accurately
// measured, the position of something may 'drift' during drawing).
function scrollPosIntoView(cm, pos, end, margin) {
  if (margin == null) { margin = 0 }
  var rect
  if (!cm.options.lineWrapping && pos == end) {
    // Set pos and end to the cursor positions around the character pos sticks to
    // If pos.sticky == "before", that is around pos.ch - 1, otherwise around pos.ch
    // If pos == Pos(_, 0, "before"), pos and end are unchanged
    pos = pos.ch ? Pos(pos.line, pos.sticky == "before" ? pos.ch - 1 : pos.ch, "after") : pos
    end = pos.sticky == "before" ? Pos(pos.line, pos.ch + 1, "before") : pos
  }
  for (var limit = 0; limit < 5; limit++) {
    var changed = false
    var coords = cursorCoords(cm, pos)
    var endCoords = !end || end == pos ? coords : cursorCoords(cm, end)
    rect = {left: Math.min(coords.left, endCoords.left),
            top: Math.min(coords.top, endCoords.top) - margin,
            right: Math.max(coords.left, endCoords.left),
            bottom: Math.max(coords.bottom, endCoords.bottom) + margin}
    var scrollPos = calculateScrollPos(cm, rect)
    var startTop = cm.doc.scrollTop, startLeft = cm.doc.scrollLeft
    if (scrollPos.scrollTop != null) {
      updateScrollTop(cm, scrollPos.scrollTop)
      if (Math.abs(cm.doc.scrollTop - startTop) > 1) { changed = true }
    }
    if (scrollPos.scrollLeft != null) {
      setScrollLeft(cm, scrollPos.scrollLeft)
      if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) { changed = true }
    }
    if (!changed) { break }
  }
  return rect
}

// Scroll a given set of coordinates into view (immediately).
function scrollIntoView(cm, rect) {
  var scrollPos = calculateScrollPos(cm, rect)
  if (scrollPos.scrollTop != null) { updateScrollTop(cm, scrollPos.scrollTop) }
  if (scrollPos.scrollLeft != null) { setScrollLeft(cm, scrollPos.scrollLeft) }
}

// Calculate a new scroll position needed to scroll the given
// rectangle into view. Returns an object with scrollTop and
// scrollLeft properties. When these are undefined, the
// vertical/horizontal position does not need to be adjusted.
function calculateScrollPos(cm, rect) {
  var display = cm.display, snapMargin = textHeight(cm.display)
  if (rect.top < 0) { rect.top = 0 }
  var screentop = cm.curOp && cm.curOp.scrollTop != null ? cm.curOp.scrollTop : display.scroller.scrollTop
  var screen = displayHeight(cm), result = {}
  if (rect.bottom - rect.top > screen) { rect.bottom = rect.top + screen }
  var docBottom = cm.doc.height + paddingVert(display)
  var atTop = rect.top < snapMargin, atBottom = rect.bottom > docBottom - snapMargin
  if (rect.top < screentop) {
    result.scrollTop = atTop ? 0 : rect.top
  } else if (rect.bottom > screentop + screen) {
    var newTop = Math.min(rect.top, (atBottom ? docBottom : rect.bottom) - screen)
    if (newTop != screentop) { result.scrollTop = newTop }
  }

  var screenleft = cm.curOp && cm.curOp.scrollLeft != null ? cm.curOp.scrollLeft : display.scroller.scrollLeft
  var screenw = displayWidth(cm) - (cm.options.fixedGutter ? display.gutters.offsetWidth : 0)
  var tooWide = rect.right - rect.left > screenw
  if (tooWide) { rect.right = rect.left + screenw }
  if (rect.left < 10)
    { result.scrollLeft = 0 }
  else if (rect.left < screenleft)
    { result.scrollLeft = Math.max(0, rect.left - (tooWide ? 0 : 10)) }
  else if (rect.right > screenw + screenleft - 3)
    { result.scrollLeft = rect.right + (tooWide ? 0 : 10) - screenw }
  return result
}

// Store a relative adjustment to the scroll position in the current
// operation (to be applied when the operation finishes).
function addToScrollTop(cm, top) {
  if (top == null) { return }
  resolveScrollToPos(cm)
  cm.curOp.scrollTop = (cm.curOp.scrollTop == null ? cm.doc.scrollTop : cm.curOp.scrollTop) + top
}

// Make sure that at the end of the operation the current cursor is
// shown.
function ensureCursorVisible(cm) {
  resolveScrollToPos(cm)
  var cur = cm.getCursor()
  cm.curOp.scrollToPos = {from: cur, to: cur, margin: cm.options.cursorScrollMargin}
}

function scrollToCoords(cm, x, y) {
  if (x != null || y != null) { resolveScrollToPos(cm) }
  if (x != null) { cm.curOp.scrollLeft = x }
  if (y != null) { cm.curOp.scrollTop = y }
}

function scrollToRange(cm, range) {
  resolveScrollToPos(cm)
  cm.curOp.scrollToPos = range
}

// When an operation has its scrollToPos property set, and another
// scroll action is applied before the end of the operation, this
// 'simulates' scrolling that position into view in a cheap way, so
// that the effect of intermediate scroll commands is not ignored.
function resolveScrollToPos(cm) {
  var range = cm.curOp.scrollToPos
  if (range) {
    cm.curOp.scrollToPos = null
    var from = estimateCoords(cm, range.from), to = estimateCoords(cm, range.to)
    scrollToCoordsRange(cm, from, to, range.margin)
  }
}

function scrollToCoordsRange(cm, from, to, margin) {
  var sPos = calculateScrollPos(cm, {
    left: Math.min(from.left, to.left),
    top: Math.min(from.top, to.top) - margin,
    right: Math.max(from.right, to.right),
    bottom: Math.max(from.bottom, to.bottom) + margin
  })
  scrollToCoords(cm, sPos.scrollLeft, sPos.scrollTop)
}

// Sync the scrollable area and scrollbars, ensure the viewport
// covers the visible area.
function updateScrollTop(cm, val) {
  if (Math.abs(cm.doc.scrollTop - val) < 2) { return }
  if (!gecko) { updateDisplaySimple(cm, {top: val}) }
  setScrollTop(cm, val, true)
  if (gecko) { updateDisplaySimple(cm) }
  startWorker(cm, 100)
}

function setScrollTop(cm, val, forceScroll) {
  val = Math.min(cm.display.scroller.scrollHeight - cm.display.scroller.clientHeight, val)
  if (cm.display.scroller.scrollTop == val && !forceScroll) { return }
  cm.doc.scrollTop = val
  cm.display.scrollbars.setScrollTop(val)
  if (cm.display.scroller.scrollTop != val) { cm.display.scroller.scrollTop = val }
}

// Sync scroller and scrollbar, ensure the gutter elements are
// aligned.
function setScrollLeft(cm, val, isScroller, forceScroll) {
  val = Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth)
  if ((isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) && !forceScroll) { return }
  cm.doc.scrollLeft = val
  alignHorizontally(cm)
  if (cm.display.scroller.scrollLeft != val) { cm.display.scroller.scrollLeft = val }
  cm.display.scrollbars.setScrollLeft(val)
}

// SCROLLBARS

// Prepare DOM reads needed to update the scrollbars. Done in one
// shot to minimize update/measure roundtrips.
function measureForScrollbars(cm) {
  var d = cm.display, gutterW = d.gutters.offsetWidth
  var docH = Math.round(cm.doc.height + paddingVert(cm.display))
  return {
    clientHeight: d.scroller.clientHeight,
    viewHeight: d.wrapper.clientHeight,
    scrollWidth: d.scroller.scrollWidth, clientWidth: d.scroller.clientWidth,
    viewWidth: d.wrapper.clientWidth,
    barLeft: cm.options.fixedGutter ? gutterW : 0,
    docHeight: docH,
    scrollHeight: docH + scrollGap(cm) + d.barHeight,
    nativeBarWidth: d.nativeBarWidth,
    gutterWidth: gutterW
  }
}

var NativeScrollbars = function(place, scroll, cm) {
  this.cm = cm
  var vert = this.vert = elt("div", [elt("div", null, null, "min-width: 1px")], "CodeMirror-vscrollbar")
  var horiz = this.horiz = elt("div", [elt("div", null, null, "height: 100%; min-height: 1px")], "CodeMirror-hscrollbar")
  place(vert); place(horiz)

  on(vert, "scroll", function () {
    if (vert.clientHeight) { scroll(vert.scrollTop, "vertical") }
  })
  on(horiz, "scroll", function () {
    if (horiz.clientWidth) { scroll(horiz.scrollLeft, "horizontal") }
  })

  this.checkedZeroWidth = false
  // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
  if (ie && ie_version < 8) { this.horiz.style.minHeight = this.vert.style.minWidth = "18px" }
};

NativeScrollbars.prototype.update = function (measure) {
  var needsH = measure.scrollWidth > measure.clientWidth + 1
  var needsV = measure.scrollHeight > measure.clientHeight + 1
  var sWidth = measure.nativeBarWidth

  if (needsV) {
    this.vert.style.display = "block"
    this.vert.style.bottom = needsH ? sWidth + "px" : "0"
    var totalHeight = measure.viewHeight - (needsH ? sWidth : 0)
    // A bug in IE8 can cause this value to be negative, so guard it.
    this.vert.firstChild.style.height =
      Math.max(0, measure.scrollHeight - measure.clientHeight + totalHeight) + "px"
  } else {
    this.vert.style.display = ""
    this.vert.firstChild.style.height = "0"
  }

  if (needsH) {
    this.horiz.style.display = "block"
    this.horiz.style.right = needsV ? sWidth + "px" : "0"
    this.horiz.style.left = measure.barLeft + "px"
    var totalWidth = measure.viewWidth - measure.barLeft - (needsV ? sWidth : 0)
    this.horiz.firstChild.style.width =
      Math.max(0, measure.scrollWidth - measure.clientWidth + totalWidth) + "px"
  } else {
    this.horiz.style.display = ""
    this.horiz.firstChild.style.width = "0"
  }

  if (!this.checkedZeroWidth && measure.clientHeight > 0) {
    if (sWidth == 0) { this.zeroWidthHack() }
    this.checkedZeroWidth = true
  }

  return {right: needsV ? sWidth : 0, bottom: needsH ? sWidth : 0}
};

NativeScrollbars.prototype.setScrollLeft = function (pos) {
  if (this.horiz.scrollLeft != pos) { this.horiz.scrollLeft = pos }
  if (this.disableHoriz) { this.enableZeroWidthBar(this.horiz, this.disableHoriz, "horiz") }
};

NativeScrollbars.prototype.setScrollTop = function (pos) {
  if (this.vert.scrollTop != pos) { this.vert.scrollTop = pos }
  if (this.disableVert) { this.enableZeroWidthBar(this.vert, this.disableVert, "vert") }
};

NativeScrollbars.prototype.zeroWidthHack = function () {
  var w = mac && !mac_geMountainLion ? "12px" : "18px"
  this.horiz.style.height = this.vert.style.width = w
  this.horiz.style.pointerEvents = this.vert.style.pointerEvents = "none"
  this.disableHoriz = new Delayed
  this.disableVert = new Delayed
};

NativeScrollbars.prototype.enableZeroWidthBar = function (bar, delay, type) {
  bar.style.pointerEvents = "auto"
  function maybeDisable() {
    // To find out whether the scrollbar is still visible, we
    // check whether the element under the pixel in the bottom
    // right corner of the scrollbar box is the scrollbar box
    // itself (when the bar is still visible) or its filler child
    // (when the bar is hidden). If it is still visible, we keep
    // it enabled, if it's hidden, we disable pointer events.
    var box = bar.getBoundingClientRect()
    var elt = type == "vert" ? document.elementFromPoint(box.right - 1, (box.top + box.bottom) / 2)
        : document.elementFromPoint((box.right + box.left) / 2, box.bottom - 1)
    if (elt != bar) { bar.style.pointerEvents = "none" }
    else { delay.set(1000, maybeDisable) }
  }
  delay.set(1000, maybeDisable)
};

NativeScrollbars.prototype.clear = function () {
  var parent = this.horiz.parentNode
  parent.removeChild(this.horiz)
  parent.removeChild(this.vert)
};

var NullScrollbars = function () {};

NullScrollbars.prototype.update = function () { return {bottom: 0, right: 0} };
NullScrollbars.prototype.setScrollLeft = function () {};
NullScrollbars.prototype.setScrollTop = function () {};
NullScrollbars.prototype.clear = function () {};

function updateScrollbars(cm, measure) {
  if (!measure) { measure = measureForScrollbars(cm) }
  var startWidth = cm.display.barWidth, startHeight = cm.display.barHeight
  updateScrollbarsInner(cm, measure)
  for (var i = 0; i < 4 && startWidth != cm.display.barWidth || startHeight != cm.display.barHeight; i++) {
    if (startWidth != cm.display.barWidth && cm.options.lineWrapping)
      { updateHeightsInViewport(cm) }
    updateScrollbarsInner(cm, measureForScrollbars(cm))
    startWidth = cm.display.barWidth; startHeight = cm.display.barHeight
  }
}

// Re-synchronize the fake scrollbars with the actual size of the
// content.
function updateScrollbarsInner(cm, measure) {
  var d = cm.display
  var sizes = d.scrollbars.update(measure)

  d.sizer.style.paddingRight = (d.barWidth = sizes.right) + "px"
  d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + "px"
  d.heightForcer.style.borderBottom = sizes.bottom + "px solid transparent"

  if (sizes.right && sizes.bottom) {
    d.scrollbarFiller.style.display = "block"
    d.scrollbarFiller.style.height = sizes.bottom + "px"
    d.scrollbarFiller.style.width = sizes.right + "px"
  } else { d.scrollbarFiller.style.display = "" }
  if (sizes.bottom && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {
    d.gutterFiller.style.display = "block"
    d.gutterFiller.style.height = sizes.bottom + "px"
    d.gutterFiller.style.width = measure.gutterWidth + "px"
  } else { d.gutterFiller.style.display = "" }
}

var scrollbarModel = {"native": NativeScrollbars, "null": NullScrollbars}

function initScrollbars(cm) {
  if (cm.display.scrollbars) {
    cm.display.scrollbars.clear()
    if (cm.display.scrollbars.addClass)
      { rmClass(cm.display.wrapper, cm.display.scrollbars.addClass) }
  }

  cm.display.scrollbars = new scrollbarModel[cm.options.scrollbarStyle](function (node) {
    cm.display.wrapper.insertBefore(node, cm.display.scrollbarFiller)
    // Prevent clicks in the scrollbars from killing focus
    on(node, "mousedown", function () {
      if (cm.state.focused) { setTimeout(function () { return cm.display.input.focus(); }, 0) }
    })
    node.setAttribute("cm-not-content", "true")
  }, function (pos, axis) {
    if (axis == "horizontal") { setScrollLeft(cm, pos) }
    else { updateScrollTop(cm, pos) }
  }, cm)
  if (cm.display.scrollbars.addClass)
    { addClass(cm.display.wrapper, cm.display.scrollbars.addClass) }
}

// Operations are used to wrap a series of changes to the editor
// state in such a way that each change won't have to update the
// cursor and display (which would be awkward, slow, and
// error-prone). Instead, display updates are batched and then all
// combined and executed at once.

var nextOpId = 0
// Start a new operation.
function startOperation(cm) {
  cm.curOp = {
    cm: cm,
    viewChanged: false,      // Flag that indicates that lines might need to be redrawn
    startHeight: cm.doc.height, // Used to detect need to update scrollbar
    forceUpdate: false,      // Used to force a redraw
    updateInput: null,       // Whether to reset the input textarea
    typing: false,           // Whether this reset should be careful to leave existing text (for compositing)
    changeObjs: null,        // Accumulated changes, for firing change events
    cursorActivityHandlers: null, // Set of handlers to fire cursorActivity on
    cursorActivityCalled: 0, // Tracks which cursorActivity handlers have been called already
    selectionChanged: false, // Whether the selection needs to be redrawn
    updateMaxLine: false,    // Set when the widest line needs to be determined anew
    scrollLeft: null, scrollTop: null, // Intermediate scroll position, not pushed to DOM yet
    scrollToPos: null,       // Used to scroll to a specific position
    focus: false,
    id: ++nextOpId           // Unique ID
  }
  pushOperation(cm.curOp)
}

// Finish an operation, updating the display and signalling delayed events
function endOperation(cm) {
  var op = cm.curOp
  finishOperation(op, function (group) {
    for (var i = 0; i < group.ops.length; i++)
      { group.ops[i].cm.curOp = null }
    endOperations(group)
  })
}

// The DOM updates done when an operation finishes are batched so
// that the minimum number of relayouts are required.
function endOperations(group) {
  var ops = group.ops
  for (var i = 0; i < ops.length; i++) // Read DOM
    { endOperation_R1(ops[i]) }
  for (var i$1 = 0; i$1 < ops.length; i$1++) // Write DOM (maybe)
    { endOperation_W1(ops[i$1]) }
  for (var i$2 = 0; i$2 < ops.length; i$2++) // Read DOM
    { endOperation_R2(ops[i$2]) }
  for (var i$3 = 0; i$3 < ops.length; i$3++) // Write DOM (maybe)
    { endOperation_W2(ops[i$3]) }
  for (var i$4 = 0; i$4 < ops.length; i$4++) // Read DOM
    { endOperation_finish(ops[i$4]) }
}

function endOperation_R1(op) {
  var cm = op.cm, display = cm.display
  maybeClipScrollbars(cm)
  if (op.updateMaxLine) { findMaxLine(cm) }

  op.mustUpdate = op.viewChanged || op.forceUpdate || op.scrollTop != null ||
    op.scrollToPos && (op.scrollToPos.from.line < display.viewFrom ||
                       op.scrollToPos.to.line >= display.viewTo) ||
    display.maxLineChanged && cm.options.lineWrapping
  op.update = op.mustUpdate &&
    new DisplayUpdate(cm, op.mustUpdate && {top: op.scrollTop, ensure: op.scrollToPos}, op.forceUpdate)
}

function endOperation_W1(op) {
  op.updatedDisplay = op.mustUpdate && updateDisplayIfNeeded(op.cm, op.update)
}

function endOperation_R2(op) {
  var cm = op.cm, display = cm.display
  if (op.updatedDisplay) { updateHeightsInViewport(cm) }

  op.barMeasure = measureForScrollbars(cm)

  // If the max line changed since it was last measured, measure it,
  // and ensure the document's width matches it.
  // updateDisplay_W2 will use these properties to do the actual resizing
  if (display.maxLineChanged && !cm.options.lineWrapping) {
    op.adjustWidthTo = measureChar(cm, display.maxLine, display.maxLine.text.length).left + 3
    cm.display.sizerWidth = op.adjustWidthTo
    op.barMeasure.scrollWidth =
      Math.max(display.scroller.clientWidth, display.sizer.offsetLeft + op.adjustWidthTo + scrollGap(cm) + cm.display.barWidth)
    op.maxScrollLeft = Math.max(0, display.sizer.offsetLeft + op.adjustWidthTo - displayWidth(cm))
  }

  if (op.updatedDisplay || op.selectionChanged)
    { op.preparedSelection = display.input.prepareSelection() }
}

function endOperation_W2(op) {
  var cm = op.cm

  if (op.adjustWidthTo != null) {
    cm.display.sizer.style.minWidth = op.adjustWidthTo + "px"
    if (op.maxScrollLeft < cm.doc.scrollLeft)
      { setScrollLeft(cm, Math.min(cm.display.scroller.scrollLeft, op.maxScrollLeft), true) }
    cm.display.maxLineChanged = false
  }

  var takeFocus = op.focus && op.focus == activeElt()
  if (op.preparedSelection)
    { cm.display.input.showSelection(op.preparedSelection, takeFocus) }
  if (op.updatedDisplay || op.startHeight != cm.doc.height)
    { updateScrollbars(cm, op.barMeasure) }
  if (op.updatedDisplay)
    { setDocumentHeight(cm, op.barMeasure) }

  if (op.selectionChanged) { restartBlink(cm) }

  if (cm.state.focused && op.updateInput)
    { cm.display.input.reset(op.typing) }
  if (takeFocus) { ensureFocus(op.cm) }
}

function endOperation_finish(op) {
  var cm = op.cm, display = cm.display, doc = cm.doc

  if (op.updatedDisplay) { postUpdateDisplay(cm, op.update) }

  // Abort mouse wheel delta measurement, when scrolling explicitly
  if (display.wheelStartX != null && (op.scrollTop != null || op.scrollLeft != null || op.scrollToPos))
    { display.wheelStartX = display.wheelStartY = null }

  // Propagate the scroll position to the actual DOM scroller
  if (op.scrollTop != null) { setScrollTop(cm, op.scrollTop, op.forceScroll) }

  if (op.scrollLeft != null) { setScrollLeft(cm, op.scrollLeft, true, true) }
  // If we need to scroll a specific position into view, do so.
  if (op.scrollToPos) {
    var rect = scrollPosIntoView(cm, clipPos(doc, op.scrollToPos.from),
                                 clipPos(doc, op.scrollToPos.to), op.scrollToPos.margin)
    maybeScrollWindow(cm, rect)
  }

  // Fire events for markers that are hidden/unidden by editing or
  // undoing
  var hidden = op.maybeHiddenMarkers, unhidden = op.maybeUnhiddenMarkers
  if (hidden) { for (var i = 0; i < hidden.length; ++i)
    { if (!hidden[i].lines.length) { signal(hidden[i], "hide") } } }
  if (unhidden) { for (var i$1 = 0; i$1 < unhidden.length; ++i$1)
    { if (unhidden[i$1].lines.length) { signal(unhidden[i$1], "unhide") } } }

  if (display.wrapper.offsetHeight)
    { doc.scrollTop = cm.display.scroller.scrollTop }

  // Fire change events, and delayed event handlers
  if (op.changeObjs)
    { signal(cm, "changes", cm, op.changeObjs) }
  if (op.update)
    { op.update.finish() }
}

// Run the given function in an operation
function runInOp(cm, f) {
  if (cm.curOp) { return f() }
  startOperation(cm)
  try { return f() }
  finally { endOperation(cm) }
}
// Wraps a function in an operation. Returns the wrapped function.
function operation(cm, f) {
  return function() {
    if (cm.curOp) { return f.apply(cm, arguments) }
    startOperation(cm)
    try { return f.apply(cm, arguments) }
    finally { endOperation(cm) }
  }
}
// Used to add methods to editor and doc instances, wrapping them in
// operations.
function methodOp(f) {
  return function() {
    if (this.curOp) { return f.apply(this, arguments) }
    startOperation(this)
    try { return f.apply(this, arguments) }
    finally { endOperation(this) }
  }
}
function docMethodOp(f) {
  return function() {
    var cm = this.cm
    if (!cm || cm.curOp) { return f.apply(this, arguments) }
    startOperation(cm)
    try { return f.apply(this, arguments) }
    finally { endOperation(cm) }
  }
}

// Updates the display.view data structure for a given change to the
// document. From and to are in pre-change coordinates. Lendiff is
// the amount of lines added or subtracted by the change. This is
// used for changes that span multiple lines, or change the way
// lines are divided into visual lines. regLineChange (below)
// registers single-line changes.
function regChange(cm, from, to, lendiff) {
  if (from == null) { from = cm.doc.first }
  if (to == null) { to = cm.doc.first + cm.doc.size }
  if (!lendiff) { lendiff = 0 }

  var display = cm.display
  if (lendiff && to < display.viewTo &&
      (display.updateLineNumbers == null || display.updateLineNumbers > from))
    { display.updateLineNumbers = from }

  cm.curOp.viewChanged = true

  if (from >= display.viewTo) { // Change after
    if (sawCollapsedSpans && visualLineNo(cm.doc, from) < display.viewTo)
      { resetView(cm) }
  } else if (to <= display.viewFrom) { // Change before
    if (sawCollapsedSpans && visualLineEndNo(cm.doc, to + lendiff) > display.viewFrom) {
      resetView(cm)
    } else {
      display.viewFrom += lendiff
      display.viewTo += lendiff
    }
  } else if (from <= display.viewFrom && to >= display.viewTo) { // Full overlap
    resetView(cm)
  } else if (from <= display.viewFrom) { // Top overlap
    var cut = viewCuttingPoint(cm, to, to + lendiff, 1)
    if (cut) {
      display.view = display.view.slice(cut.index)
      display.viewFrom = cut.lineN
      display.viewTo += lendiff
    } else {
      resetView(cm)
    }
  } else if (to >= display.viewTo) { // Bottom overlap
    var cut$1 = viewCuttingPoint(cm, from, from, -1)
    if (cut$1) {
      display.view = display.view.slice(0, cut$1.index)
      display.viewTo = cut$1.lineN
    } else {
      resetView(cm)
    }
  } else { // Gap in the middle
    var cutTop = viewCuttingPoint(cm, from, from, -1)
    var cutBot = viewCuttingPoint(cm, to, to + lendiff, 1)
    if (cutTop && cutBot) {
      display.view = display.view.slice(0, cutTop.index)
        .concat(buildViewArray(cm, cutTop.lineN, cutBot.lineN))
        .concat(display.view.slice(cutBot.index))
      display.viewTo += lendiff
    } else {
      resetView(cm)
    }
  }

  var ext = display.externalMeasured
  if (ext) {
    if (to < ext.lineN)
      { ext.lineN += lendiff }
    else if (from < ext.lineN + ext.size)
      { display.externalMeasured = null }
  }
}

// Register a change to a single line. Type must be one of "text",
// "gutter", "class", "widget"
function regLineChange(cm, line, type) {
  cm.curOp.viewChanged = true
  var display = cm.display, ext = cm.display.externalMeasured
  if (ext && line >= ext.lineN && line < ext.lineN + ext.size)
    { display.externalMeasured = null }

  if (line < display.viewFrom || line >= display.viewTo) { return }
  var lineView = display.view[findViewIndex(cm, line)]
  if (lineView.node == null) { return }
  var arr = lineView.changes || (lineView.changes = [])
  if (indexOf(arr, type) == -1) { arr.push(type) }
}

// Clear the view.
function resetView(cm) {
  cm.display.viewFrom = cm.display.viewTo = cm.doc.first
  cm.display.view = []
  cm.display.viewOffset = 0
}

function viewCuttingPoint(cm, oldN, newN, dir) {
  var index = findViewIndex(cm, oldN), diff, view = cm.display.view
  if (!sawCollapsedSpans || newN == cm.doc.first + cm.doc.size)
    { return {index: index, lineN: newN} }
  var n = cm.display.viewFrom
  for (var i = 0; i < index; i++)
    { n += view[i].size }
  if (n != oldN) {
    if (dir > 0) {
      if (index == view.length - 1) { return null }
      diff = (n + view[index].size) - oldN
      index++
    } else {
      diff = n - oldN
    }
    oldN += diff; newN += diff
  }
  while (visualLineNo(cm.doc, newN) != newN) {
    if (index == (dir < 0 ? 0 : view.length - 1)) { return null }
    newN += dir * view[index - (dir < 0 ? 1 : 0)].size
    index += dir
  }
  return {index: index, lineN: newN}
}

// Force the view to cover a given range, adding empty view element
// or clipping off existing ones as needed.
function adjustView(cm, from, to) {
  var display = cm.display, view = display.view
  if (view.length == 0 || from >= display.viewTo || to <= display.viewFrom) {
    display.view = buildViewArray(cm, from, to)
    display.viewFrom = from
  } else {
    if (display.viewFrom > from)
      { display.view = buildViewArray(cm, from, display.viewFrom).concat(display.view) }
    else if (display.viewFrom < from)
      { display.view = display.view.slice(findViewIndex(cm, from)) }
    display.viewFrom = from
    if (display.viewTo < to)
      { display.view = display.view.concat(buildViewArray(cm, display.viewTo, to)) }
    else if (display.viewTo > to)
      { display.view = display.view.slice(0, findViewIndex(cm, to)) }
  }
  display.viewTo = to
}

// Count the number of lines in the view whose DOM representation is
// out of date (or nonexistent).
function countDirtyView(cm) {
  var view = cm.display.view, dirty = 0
  for (var i = 0; i < view.length; i++) {
    var lineView = view[i]
    if (!lineView.hidden && (!lineView.node || lineView.changes)) { ++dirty }
  }
  return dirty
}

// HIGHLIGHT WORKER

function startWorker(cm, time) {
  if (cm.doc.highlightFrontier < cm.display.viewTo)
    { cm.state.highlight.set(time, bind(highlightWorker, cm)) }
}

function highlightWorker(cm) {
  var doc = cm.doc
  if (doc.highlightFrontier >= cm.display.viewTo) { return }
  var end = +new Date + cm.options.workTime
  var context = getContextBefore(cm, doc.highlightFrontier)
  var changedLines = []

  doc.iter(context.line, Math.min(doc.first + doc.size, cm.display.viewTo + 500), function (line) {
    if (context.line >= cm.display.viewFrom) { // Visible
      var oldStyles = line.styles
      var resetState = line.text.length > cm.options.maxHighlightLength ? copyState(doc.mode, context.state) : null
      var highlighted = highlightLine(cm, line, context, true)
      if (resetState) { context.state = resetState }
      line.styles = highlighted.styles
      var oldCls = line.styleClasses, newCls = highlighted.classes
      if (newCls) { line.styleClasses = newCls }
      else if (oldCls) { line.styleClasses = null }
      var ischange = !oldStyles || oldStyles.length != line.styles.length ||
        oldCls != newCls && (!oldCls || !newCls || oldCls.bgClass != newCls.bgClass || oldCls.textClass != newCls.textClass)
      for (var i = 0; !ischange && i < oldStyles.length; ++i) { ischange = oldStyles[i] != line.styles[i] }
      if (ischange) { changedLines.push(context.line) }
      line.stateAfter = context.save()
      context.nextLine()
    } else {
      if (line.text.length <= cm.options.maxHighlightLength)
        { processLine(cm, line.text, context) }
      line.stateAfter = context.line % 5 == 0 ? context.save() : null
      context.nextLine()
    }
    if (+new Date > end) {
      startWorker(cm, cm.options.workDelay)
      return true
    }
  })
  doc.highlightFrontier = context.line
  doc.modeFrontier = Math.max(doc.modeFrontier, context.line)
  if (changedLines.length) { runInOp(cm, function () {
    for (var i = 0; i < changedLines.length; i++)
      { regLineChange(cm, changedLines[i], "text") }
  }) }
}

// DISPLAY DRAWING

var DisplayUpdate = function(cm, viewport, force) {
  var display = cm.display

  this.viewport = viewport
  // Store some values that we'll need later (but don't want to force a relayout for)
  this.visible = visibleLines(display, cm.doc, viewport)
  this.editorIsHidden = !display.wrapper.offsetWidth
  this.wrapperHeight = display.wrapper.clientHeight
  this.wrapperWidth = display.wrapper.clientWidth
  this.oldDisplayWidth = displayWidth(cm)
  this.force = force
  this.dims = getDimensions(cm)
  this.events = []
};

DisplayUpdate.prototype.signal = function (emitter, type) {
  if (hasHandler(emitter, type))
    { this.events.push(arguments) }
};
DisplayUpdate.prototype.finish = function () {
    var this$1 = this;

  for (var i = 0; i < this.events.length; i++)
    { signal.apply(null, this$1.events[i]) }
};

function maybeClipScrollbars(cm) {
  var display = cm.display
  if (!display.scrollbarsClipped && display.scroller.offsetWidth) {
    display.nativeBarWidth = display.scroller.offsetWidth - display.scroller.clientWidth
    display.heightForcer.style.height = scrollGap(cm) + "px"
    display.sizer.style.marginBottom = -display.nativeBarWidth + "px"
    display.sizer.style.borderRightWidth = scrollGap(cm) + "px"
    display.scrollbarsClipped = true
  }
}

function selectionSnapshot(cm) {
  if (cm.hasFocus()) { return null }
  var active = activeElt()
  if (!active || !contains(cm.display.lineDiv, active)) { return null }
  var result = {activeElt: active}
  if (window.getSelection) {
    var sel = window.getSelection()
    if (sel.anchorNode && sel.extend && contains(cm.display.lineDiv, sel.anchorNode)) {
      result.anchorNode = sel.anchorNode
      result.anchorOffset = sel.anchorOffset
      result.focusNode = sel.focusNode
      result.focusOffset = sel.focusOffset
    }
  }
  return result
}

function restoreSelection(snapshot) {
  if (!snapshot || !snapshot.activeElt || snapshot.activeElt == activeElt()) { return }
  snapshot.activeElt.focus()
  if (snapshot.anchorNode && contains(document.body, snapshot.anchorNode) && contains(document.body, snapshot.focusNode)) {
    var sel = window.getSelection(), range = document.createRange()
    range.setEnd(snapshot.anchorNode, snapshot.anchorOffset)
    range.collapse(false)
    sel.removeAllRanges()
    sel.addRange(range)
    sel.extend(snapshot.focusNode, snapshot.focusOffset)
  }
}

// Does the actual updating of the line display. Bails out
// (returning false) when there is nothing to be done and forced is
// false.
function updateDisplayIfNeeded(cm, update) {
  var display = cm.display, doc = cm.doc

  if (update.editorIsHidden) {
    resetView(cm)
    return false
  }

  // Bail out if the visible area is already rendered and nothing changed.
  if (!update.force &&
      update.visible.from >= display.viewFrom && update.visible.to <= display.viewTo &&
      (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo) &&
      display.renderedView == display.view && countDirtyView(cm) == 0)
    { return false }

  if (maybeUpdateLineNumberWidth(cm)) {
    resetView(cm)
    update.dims = getDimensions(cm)
  }

  // Compute a suitable new viewport (from & to)
  var end = doc.first + doc.size
  var from = Math.max(update.visible.from - cm.options.viewportMargin, doc.first)
  var to = Math.min(end, update.visible.to + cm.options.viewportMargin)
  if (display.viewFrom < from && from - display.viewFrom < 20) { from = Math.max(doc.first, display.viewFrom) }
  if (display.viewTo > to && display.viewTo - to < 20) { to = Math.min(end, display.viewTo) }
  if (sawCollapsedSpans) {
    from = visualLineNo(cm.doc, from)
    to = visualLineEndNo(cm.doc, to)
  }

  var different = from != display.viewFrom || to != display.viewTo ||
    display.lastWrapHeight != update.wrapperHeight || display.lastWrapWidth != update.wrapperWidth
  adjustView(cm, from, to)

  display.viewOffset = heightAtLine(getLine(cm.doc, display.viewFrom))
  // Position the mover div to align with the current scroll position
  cm.display.mover.style.top = display.viewOffset + "px"

  var toUpdate = countDirtyView(cm)
  if (!different && toUpdate == 0 && !update.force && display.renderedView == display.view &&
      (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo))
    { return false }

  // For big changes, we hide the enclosing element during the
  // update, since that speeds up the operations on most browsers.
  var selSnapshot = selectionSnapshot(cm)
  if (toUpdate > 4) { display.lineDiv.style.display = "none" }
  patchDisplay(cm, display.updateLineNumbers, update.dims)
  if (toUpdate > 4) { display.lineDiv.style.display = "" }
  display.renderedView = display.view
  // There might have been a widget with a focused element that got
  // hidden or updated, if so re-focus it.
  restoreSelection(selSnapshot)

  // Prevent selection and cursors from interfering with the scroll
  // width and height.
  removeChildren(display.cursorDiv)
  removeChildren(display.selectionDiv)
  display.gutters.style.height = display.sizer.style.minHeight = 0

  if (different) {
    display.lastWrapHeight = update.wrapperHeight
    display.lastWrapWidth = update.wrapperWidth
    startWorker(cm, 400)
  }

  display.updateLineNumbers = null

  return true
}

function postUpdateDisplay(cm, update) {
  var viewport = update.viewport

  for (var first = true;; first = false) {
    if (!first || !cm.options.lineWrapping || update.oldDisplayWidth == displayWidth(cm)) {
      // Clip forced viewport to actual scrollable area.
      if (viewport && viewport.top != null)
        { viewport = {top: Math.min(cm.doc.height + paddingVert(cm.display) - displayHeight(cm), viewport.top)} }
      // Updated line heights might result in the drawn area not
      // actually covering the viewport. Keep looping until it does.
      update.visible = visibleLines(cm.display, cm.doc, viewport)
      if (update.visible.from >= cm.display.viewFrom && update.visible.to <= cm.display.viewTo)
        { break }
    }
    if (!updateDisplayIfNeeded(cm, update)) { break }
    updateHeightsInViewport(cm)
    var barMeasure = measureForScrollbars(cm)
    updateSelection(cm)
    updateScrollbars(cm, barMeasure)
    setDocumentHeight(cm, barMeasure)
    update.force = false
  }

  update.signal(cm, "update", cm)
  if (cm.display.viewFrom != cm.display.reportedViewFrom || cm.display.viewTo != cm.display.reportedViewTo) {
    update.signal(cm, "viewportChange", cm, cm.display.viewFrom, cm.display.viewTo)
    cm.display.reportedViewFrom = cm.display.viewFrom; cm.display.reportedViewTo = cm.display.viewTo
  }
}

function updateDisplaySimple(cm, viewport) {
  var update = new DisplayUpdate(cm, viewport)
  if (updateDisplayIfNeeded(cm, update)) {
    updateHeightsInViewport(cm)
    postUpdateDisplay(cm, update)
    var barMeasure = measureForScrollbars(cm)
    updateSelection(cm)
    updateScrollbars(cm, barMeasure)
    setDocumentHeight(cm, barMeasure)
    update.finish()
  }
}

// Sync the actual display DOM structure with display.view, removing
// nodes for lines that are no longer in view, and creating the ones
// that are not there yet, and updating the ones that are out of
// date.
function patchDisplay(cm, updateNumbersFrom, dims) {
  var display = cm.display, lineNumbers = cm.options.lineNumbers
  var container = display.lineDiv, cur = container.firstChild

  function rm(node) {
    var next = node.nextSibling
    // Works around a throw-scroll bug in OS X Webkit
    if (webkit && mac && cm.display.currentWheelTarget == node)
      { node.style.display = "none" }
    else
      { node.parentNode.removeChild(node) }
    return next
  }

  var view = display.view, lineN = display.viewFrom
  // Loop over the elements in the view, syncing cur (the DOM nodes
  // in display.lineDiv) with the view as we go.
  for (var i = 0; i < view.length; i++) {
    var lineView = view[i]
    if (lineView.hidden) {
    } else if (!lineView.node || lineView.node.parentNode != container) { // Not drawn yet
      var node = buildLineElement(cm, lineView, lineN, dims)
      container.insertBefore(node, cur)
    } else { // Already drawn
      while (cur != lineView.node) { cur = rm(cur) }
      var updateNumber = lineNumbers && updateNumbersFrom != null &&
        updateNumbersFrom <= lineN && lineView.lineNumber
      if (lineView.changes) {
        if (indexOf(lineView.changes, "gutter") > -1) { updateNumber = false }
        updateLineForChanges(cm, lineView, lineN, dims)
      }
      if (updateNumber) {
        removeChildren(lineView.lineNumber)
        lineView.lineNumber.appendChild(document.createTextNode(lineNumberFor(cm.options, lineN)))
      }
      cur = lineView.node.nextSibling
    }
    lineN += lineView.size
  }
  while (cur) { cur = rm(cur) }
}

function updateGutterSpace(cm) {
  var width = cm.display.gutters.offsetWidth
  cm.display.sizer.style.marginLeft = width + "px"
}

function setDocumentHeight(cm, measure) {
  cm.display.sizer.style.minHeight = measure.docHeight + "px"
  cm.display.heightForcer.style.top = measure.docHeight + "px"
  cm.display.gutters.style.height = (measure.docHeight + cm.display.barHeight + scrollGap(cm)) + "px"
}

// Rebuild the gutter elements, ensure the margin to the left of the
// code matches their width.
function updateGutters(cm) {
  var gutters = cm.display.gutters, specs = cm.options.gutters
  removeChildren(gutters)
  var i = 0
  for (; i < specs.length; ++i) {
    var gutterClass = specs[i]
    var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " + gutterClass))
    if (gutterClass == "CodeMirror-linenumbers") {
      cm.display.lineGutter = gElt
      gElt.style.width = (cm.display.lineNumWidth || 1) + "px"
    }
  }
  gutters.style.display = i ? "" : "none"
  updateGutterSpace(cm)
}

// Make sure the gutters options contains the element
// "CodeMirror-linenumbers" when the lineNumbers option is true.
function setGuttersForLineNumbers(options) {
  var found = indexOf(options.gutters, "CodeMirror-linenumbers")
  if (found == -1 && options.lineNumbers) {
    options.gutters = options.gutters.concat(["CodeMirror-linenumbers"])
  } else if (found > -1 && !options.lineNumbers) {
    options.gutters = options.gutters.slice(0)
    options.gutters.splice(found, 1)
  }
}

var wheelSamples = 0;
var wheelPixelsPerUnit = null;
// Fill in a browser-detected starting value on browsers where we
// know one. These don't have to be accurate -- the result of them
// being wrong would just be a slight flicker on the first wheel
// scroll (if it is large enough).
if (ie) { wheelPixelsPerUnit = -.53 }
else if (gecko) { wheelPixelsPerUnit = 15 }
else if (chrome) { wheelPixelsPerUnit = -.7 }
else if (safari) { wheelPixelsPerUnit = -1/3 }

function wheelEventDelta(e) {
  var dx = e.wheelDeltaX, dy = e.wheelDeltaY
  if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) { dx = e.detail }
  if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) { dy = e.detail }
  else if (dy == null) { dy = e.wheelDelta }
  return {x: dx, y: dy}
}
function wheelEventPixels(e) {
  var delta = wheelEventDelta(e)
  delta.x *= wheelPixelsPerUnit
  delta.y *= wheelPixelsPerUnit
  return delta
}

function onScrollWheel(cm, e) {
  var delta = wheelEventDelta(e), dx = delta.x, dy = delta.y

  var display = cm.display, scroll = display.scroller
  // Quit if there's nothing to scroll here
  var canScrollX = scroll.scrollWidth > scroll.clientWidth
  var canScrollY = scroll.scrollHeight > scroll.clientHeight
  if (!(dx && canScrollX || dy && canScrollY)) { return }

  // Webkit browsers on OS X abort momentum scrolls when the target
  // of the scroll event is removed from the scrollable element.
  // This hack (see related code in patchDisplay) makes sure the
  // element is kept around.
  if (dy && mac && webkit) {
    outer: for (var cur = e.target, view = display.view; cur != scroll; cur = cur.parentNode) {
      for (var i = 0; i < view.length; i++) {
        if (view[i].node == cur) {
          cm.display.currentWheelTarget = cur
          break outer
        }
      }
    }
  }

  // On some browsers, horizontal scrolling will cause redraws to
  // happen before the gutter has been realigned, causing it to
  // wriggle around in a most unseemly way. When we have an
  // estimated pixels/delta value, we just handle horizontal
  // scrolling entirely here. It'll be slightly off from native, but
  // better than glitching out.
  if (dx && !gecko && !presto && wheelPixelsPerUnit != null) {
    if (dy && canScrollY)
      { updateScrollTop(cm, Math.max(0, scroll.scrollTop + dy * wheelPixelsPerUnit)) }
    setScrollLeft(cm, Math.max(0, scroll.scrollLeft + dx * wheelPixelsPerUnit))
    // Only prevent default scrolling if vertical scrolling is
    // actually possible. Otherwise, it causes vertical scroll
    // jitter on OSX trackpads when deltaX is small and deltaY
    // is large (issue #3579)
    if (!dy || (dy && canScrollY))
      { e_preventDefault(e) }
    display.wheelStartX = null // Abort measurement, if in progress
    return
  }

  // 'Project' the visible viewport to cover the area that is being
  // scrolled into view (if we know enough to estimate it).
  if (dy && wheelPixelsPerUnit != null) {
    var pixels = dy * wheelPixelsPerUnit
    var top = cm.doc.scrollTop, bot = top + display.wrapper.clientHeight
    if (pixels < 0) { top = Math.max(0, top + pixels - 50) }
    else { bot = Math.min(cm.doc.height, bot + pixels + 50) }
    updateDisplaySimple(cm, {top: top, bottom: bot})
  }

  if (wheelSamples < 20) {
    if (display.wheelStartX == null) {
      display.wheelStartX = scroll.scrollLeft; display.wheelStartY = scroll.scrollTop
      display.wheelDX = dx; display.wheelDY = dy
      setTimeout(function () {
        if (display.wheelStartX == null) { return }
        var movedX = scroll.scrollLeft - display.wheelStartX
        var movedY = scroll.scrollTop - display.wheelStartY
        var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||
          (movedX && display.wheelDX && movedX / display.wheelDX)
        display.wheelStartX = display.wheelStartY = null
        if (!sample) { return }
        wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1)
        ++wheelSamples
      }, 200)
    } else {
      display.wheelDX += dx; display.wheelDY += dy
    }
  }
}

// Selection objects are immutable. A new one is created every time
// the selection changes. A selection is one or more non-overlapping
// (and non-touching) ranges, sorted, and an integer that indicates
// which one is the primary selection (the one that's scrolled into
// view, that getCursor returns, etc).
var Selection = function(ranges, primIndex) {
  this.ranges = ranges
  this.primIndex = primIndex
};

Selection.prototype.primary = function () { return this.ranges[this.primIndex] };

Selection.prototype.equals = function (other) {
    var this$1 = this;

  if (other == this) { return true }
  if (other.primIndex != this.primIndex || other.ranges.length != this.ranges.length) { return false }
  for (var i = 0; i < this.ranges.length; i++) {
    var here = this$1.ranges[i], there = other.ranges[i]
    if (!equalCursorPos(here.anchor, there.anchor) || !equalCursorPos(here.head, there.head)) { return false }
  }
  return true
};

Selection.prototype.deepCopy = function () {
    var this$1 = this;

  var out = []
  for (var i = 0; i < this.ranges.length; i++)
    { out[i] = new Range(copyPos(this$1.ranges[i].anchor), copyPos(this$1.ranges[i].head)) }
  return new Selection(out, this.primIndex)
};

Selection.prototype.somethingSelected = function () {
    var this$1 = this;

  for (var i = 0; i < this.ranges.length; i++)
    { if (!this$1.ranges[i].empty()) { return true } }
  return false
};

Selection.prototype.contains = function (pos, end) {
    var this$1 = this;

  if (!end) { end = pos }
  for (var i = 0; i < this.ranges.length; i++) {
    var range = this$1.ranges[i]
    if (cmp(end, range.from()) >= 0 && cmp(pos, range.to()) <= 0)
      { return i }
  }
  return -1
};

var Range = function(anchor, head) {
  this.anchor = anchor; this.head = head
};

Range.prototype.from = function () { return minPos(this.anchor, this.head) };
Range.prototype.to = function () { return maxPos(this.anchor, this.head) };
Range.prototype.empty = function () { return this.head.line == this.anchor.line && this.head.ch == this.anchor.ch };

// Take an unsorted, potentially overlapping set of ranges, and
// build a selection out of it. 'Consumes' ranges array (modifying
// it).
function normalizeSelection(ranges, primIndex) {
  var prim = ranges[primIndex]
  ranges.sort(function (a, b) { return cmp(a.from(), b.from()); })
  primIndex = indexOf(ranges, prim)
  for (var i = 1; i < ranges.length; i++) {
    var cur = ranges[i], prev = ranges[i - 1]
    if (cmp(prev.to(), cur.from()) >= 0) {
      var from = minPos(prev.from(), cur.from()), to = maxPos(prev.to(), cur.to())
      var inv = prev.empty() ? cur.from() == cur.head : prev.from() == prev.head
      if (i <= primIndex) { --primIndex }
      ranges.splice(--i, 2, new Range(inv ? to : from, inv ? from : to))
    }
  }
  return new Selection(ranges, primIndex)
}

function simpleSelection(anchor, head) {
  return new Selection([new Range(anchor, head || anchor)], 0)
}

// Compute the position of the end of a change (its 'to' property
// refers to the pre-change end).
function changeEnd(change) {
  if (!change.text) { return change.to }
  return Pos(change.from.line + change.text.length - 1,
             lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0))
}

// Adjust a position to refer to the post-change position of the
// same text, or the end of the change if the change covers it.
function adjustForChange(pos, change) {
  if (cmp(pos, change.from) < 0) { return pos }
  if (cmp(pos, change.to) <= 0) { return changeEnd(change) }

  var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch
  if (pos.line == change.to.line) { ch += changeEnd(change).ch - change.to.ch }
  return Pos(line, ch)
}

function computeSelAfterChange(doc, change) {
  var out = []
  for (var i = 0; i < doc.sel.ranges.length; i++) {
    var range = doc.sel.ranges[i]
    out.push(new Range(adjustForChange(range.anchor, change),
                       adjustForChange(range.head, change)))
  }
  return normalizeSelection(out, doc.sel.primIndex)
}

function offsetPos(pos, old, nw) {
  if (pos.line == old.line)
    { return Pos(nw.line, pos.ch - old.ch + nw.ch) }
  else
    { return Pos(nw.line + (pos.line - old.line), pos.ch) }
}

// Used by replaceSelections to allow moving the selection to the
// start or around the replaced test. Hint may be "start" or "around".
function computeReplacedSel(doc, changes, hint) {
  var out = []
  var oldPrev = Pos(doc.first, 0), newPrev = oldPrev
  for (var i = 0; i < changes.length; i++) {
    var change = changes[i]
    var from = offsetPos(change.from, oldPrev, newPrev)
    var to = offsetPos(changeEnd(change), oldPrev, newPrev)
    oldPrev = change.to
    newPrev = to
    if (hint == "around") {
      var range = doc.sel.ranges[i], inv = cmp(range.head, range.anchor) < 0
      out[i] = new Range(inv ? to : from, inv ? from : to)
    } else {
      out[i] = new Range(from, from)
    }
  }
  return new Selection(out, doc.sel.primIndex)
}

// Used to get the editor into a consistent state again when options change.

function loadMode(cm) {
  cm.doc.mode = getMode(cm.options, cm.doc.modeOption)
  resetModeState(cm)
}

function resetModeState(cm) {
  cm.doc.iter(function (line) {
    if (line.stateAfter) { line.stateAfter = null }
    if (line.styles) { line.styles = null }
  })
  cm.doc.modeFrontier = cm.doc.highlightFrontier = cm.doc.first
  startWorker(cm, 100)
  cm.state.modeGen++
  if (cm.curOp) { regChange(cm) }
}

// DOCUMENT DATA STRUCTURE

// By default, updates that start and end at the beginning of a line
// are treated specially, in order to make the association of line
// widgets and marker elements with the text behave more intuitive.
function isWholeLineUpdate(doc, change) {
  return change.from.ch == 0 && change.to.ch == 0 && lst(change.text) == "" &&
    (!doc.cm || doc.cm.options.wholeLineUpdateBefore)
}

// Perform a change on the document data structure.
function updateDoc(doc, change, markedSpans, estimateHeight) {
  function spansFor(n) {return markedSpans ? markedSpans[n] : null}
  function update(line, text, spans) {
    updateLine(line, text, spans, estimateHeight)
    signalLater(line, "change", line, change)
  }
  function linesFor(start, end) {
    var result = []
    for (var i = start; i < end; ++i)
      { result.push(new Line(text[i], spansFor(i), estimateHeight)) }
    return result
  }

  var from = change.from, to = change.to, text = change.text
  var firstLine = getLine(doc, from.line), lastLine = getLine(doc, to.line)
  var lastText = lst(text), lastSpans = spansFor(text.length - 1), nlines = to.line - from.line

  // Adjust the line structure
  if (change.full) {
    doc.insert(0, linesFor(0, text.length))
    doc.remove(text.length, doc.size - text.length)
  } else if (isWholeLineUpdate(doc, change)) {
    // This is a whole-line replace. Treated specially to make
    // sure line objects move the way they are supposed to.
    var added = linesFor(0, text.length - 1)
    update(lastLine, lastLine.text, lastSpans)
    if (nlines) { doc.remove(from.line, nlines) }
    if (added.length) { doc.insert(from.line, added) }
  } else if (firstLine == lastLine) {
    if (text.length == 1) {
      update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans)
    } else {
      var added$1 = linesFor(1, text.length - 1)
      added$1.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight))
      update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0))
      doc.insert(from.line + 1, added$1)
    }
  } else if (text.length == 1) {
    update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0))
    doc.remove(from.line + 1, nlines)
  } else {
    update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0))
    update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans)
    var added$2 = linesFor(1, text.length - 1)
    if (nlines > 1) { doc.remove(from.line + 1, nlines - 1) }
    doc.insert(from.line + 1, added$2)
  }

  signalLater(doc, "change", doc, change)
}

// Call f for all linked documents.
function linkedDocs(doc, f, sharedHistOnly) {
  function propagate(doc, skip, sharedHist) {
    if (doc.linked) { for (var i = 0; i < doc.linked.length; ++i) {
      var rel = doc.linked[i]
      if (rel.doc == skip) { continue }
      var shared = sharedHist && rel.sharedHist
      if (sharedHistOnly && !shared) { continue }
      f(rel.doc, shared)
      propagate(rel.doc, doc, shared)
    } }
  }
  propagate(doc, null, true)
}

// Attach a document to an editor.
function attachDoc(cm, doc) {
  if (doc.cm) { throw new Error("This document is already in use.") }
  cm.doc = doc
  doc.cm = cm
  estimateLineHeights(cm)
  loadMode(cm)
  setDirectionClass(cm)
  if (!cm.options.lineWrapping) { findMaxLine(cm) }
  cm.options.mode = doc.modeOption
  regChange(cm)
}

function setDirectionClass(cm) {
  ;(cm.doc.direction == "rtl" ? addClass : rmClass)(cm.display.lineDiv, "CodeMirror-rtl")
}

function directionChanged(cm) {
  runInOp(cm, function () {
    setDirectionClass(cm)
    regChange(cm)
  })
}

function History(startGen) {
  // Arrays of change events and selections. Doing something adds an
  // event to done and clears undo. Undoing moves events from done
  // to undone, redoing moves them in the other direction.
  this.done = []; this.undone = []
  this.undoDepth = Infinity
  // Used to track when changes can be merged into a single undo
  // event
  this.lastModTime = this.lastSelTime = 0
  this.lastOp = this.lastSelOp = null
  this.lastOrigin = this.lastSelOrigin = null
  // Used by the isClean() method
  this.generation = this.maxGeneration = startGen || 1
}

// Create a history change event from an updateDoc-style change
// object.
function historyChangeFromChange(doc, change) {
  var histChange = {from: copyPos(change.from), to: changeEnd(change), text: getBetween(doc, change.from, change.to)}
  attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1)
  linkedDocs(doc, function (doc) { return attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1); }, true)
  return histChange
}

// Pop all selection events off the end of a history array. Stop at
// a change event.
function clearSelectionEvents(array) {
  while (array.length) {
    var last = lst(array)
    if (last.ranges) { array.pop() }
    else { break }
  }
}

// Find the top change event in the history. Pop off selection
// events that are in the way.
function lastChangeEvent(hist, force) {
  if (force) {
    clearSelectionEvents(hist.done)
    return lst(hist.done)
  } else if (hist.done.length && !lst(hist.done).ranges) {
    return lst(hist.done)
  } else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {
    hist.done.pop()
    return lst(hist.done)
  }
}

// Register a change in the history. Merges changes that are within
// a single operation, or are close together with an origin that
// allows merging (starting with "+") into a single event.
function addChangeToHistory(doc, change, selAfter, opId) {
  var hist = doc.history
  hist.undone.length = 0
  var time = +new Date, cur
  var last

  if ((hist.lastOp == opId ||
       hist.lastOrigin == change.origin && change.origin &&
       ((change.origin.charAt(0) == "+" && hist.lastModTime > time - (doc.cm ? doc.cm.options.historyEventDelay : 500)) ||
        change.origin.charAt(0) == "*")) &&
      (cur = lastChangeEvent(hist, hist.lastOp == opId))) {
    // Merge this change into the last event
    last = lst(cur.changes)
    if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {
      // Optimized case for simple insertion -- don't want to add
      // new changesets for every character typed
      last.to = changeEnd(change)
    } else {
      // Add new sub-event
      cur.changes.push(historyChangeFromChange(doc, change))
    }
  } else {
    // Can not be merged, start a new event.
    var before = lst(hist.done)
    if (!before || !before.ranges)
      { pushSelectionToHistory(doc.sel, hist.done) }
    cur = {changes: [historyChangeFromChange(doc, change)],
           generation: hist.generation}
    hist.done.push(cur)
    while (hist.done.length > hist.undoDepth) {
      hist.done.shift()
      if (!hist.done[0].ranges) { hist.done.shift() }
    }
  }
  hist.done.push(selAfter)
  hist.generation = ++hist.maxGeneration
  hist.lastModTime = hist.lastSelTime = time
  hist.lastOp = hist.lastSelOp = opId
  hist.lastOrigin = hist.lastSelOrigin = change.origin

  if (!last) { signal(doc, "historyAdded") }
}

function selectionEventCanBeMerged(doc, origin, prev, sel) {
  var ch = origin.charAt(0)
  return ch == "*" ||
    ch == "+" &&
    prev.ranges.length == sel.ranges.length &&
    prev.somethingSelected() == sel.somethingSelected() &&
    new Date - doc.history.lastSelTime <= (doc.cm ? doc.cm.options.historyEventDelay : 500)
}

// Called whenever the selection changes, sets the new selection as
// the pending selection in the history, and pushes the old pending
// selection into the 'done' array when it was significantly
// different (in number of selected ranges, emptiness, or time).
function addSelectionToHistory(doc, sel, opId, options) {
  var hist = doc.history, origin = options && options.origin

  // A new event is started when the previous origin does not match
  // the current, or the origins don't allow matching. Origins
  // starting with * are always merged, those starting with + are
  // merged when similar and close together in time.
  if (opId == hist.lastSelOp ||
      (origin && hist.lastSelOrigin == origin &&
       (hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin ||
        selectionEventCanBeMerged(doc, origin, lst(hist.done), sel))))
    { hist.done[hist.done.length - 1] = sel }
  else
    { pushSelectionToHistory(sel, hist.done) }

  hist.lastSelTime = +new Date
  hist.lastSelOrigin = origin
  hist.lastSelOp = opId
  if (options && options.clearRedo !== false)
    { clearSelectionEvents(hist.undone) }
}

function pushSelectionToHistory(sel, dest) {
  var top = lst(dest)
  if (!(top && top.ranges && top.equals(sel)))
    { dest.push(sel) }
}

// Used to store marked span information in the history.
function attachLocalSpans(doc, change, from, to) {
  var existing = change["spans_" + doc.id], n = 0
  doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function (line) {
    if (line.markedSpans)
      { (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans }
    ++n
  })
}

// When un/re-doing restores text containing marked spans, those
// that have been explicitly cleared should not be restored.
function removeClearedSpans(spans) {
  if (!spans) { return null }
  var out
  for (var i = 0; i < spans.length; ++i) {
    if (spans[i].marker.explicitlyCleared) { if (!out) { out = spans.slice(0, i) } }
    else if (out) { out.push(spans[i]) }
  }
  return !out ? spans : out.length ? out : null
}

// Retrieve and filter the old marked spans stored in a change event.
function getOldSpans(doc, change) {
  var found = change["spans_" + doc.id]
  if (!found) { return null }
  var nw = []
  for (var i = 0; i < change.text.length; ++i)
    { nw.push(removeClearedSpans(found[i])) }
  return nw
}

// Used for un/re-doing changes from the history. Combines the
// result of computing the existing spans with the set of spans that
// existed in the history (so that deleting around a span and then
// undoing brings back the span).
function mergeOldSpans(doc, change) {
  var old = getOldSpans(doc, change)
  var stretched = stretchSpansOverChange(doc, change)
  if (!old) { return stretched }
  if (!stretched) { return old }

  for (var i = 0; i < old.length; ++i) {
    var oldCur = old[i], stretchCur = stretched[i]
    if (oldCur && stretchCur) {
      spans: for (var j = 0; j < stretchCur.length; ++j) {
        var span = stretchCur[j]
        for (var k = 0; k < oldCur.length; ++k)
          { if (oldCur[k].marker == span.marker) { continue spans } }
        oldCur.push(span)
      }
    } else if (stretchCur) {
      old[i] = stretchCur
    }
  }
  return old
}

// Used both to provide a JSON-safe object in .getHistory, and, when
// detaching a document, to split the history in two
function copyHistoryArray(events, newGroup, instantiateSel) {
  var copy = []
  for (var i = 0; i < events.length; ++i) {
    var event = events[i]
    if (event.ranges) {
      copy.push(instantiateSel ? Selection.prototype.deepCopy.call(event) : event)
      continue
    }
    var changes = event.changes, newChanges = []
    copy.push({changes: newChanges})
    for (var j = 0; j < changes.length; ++j) {
      var change = changes[j], m = (void 0)
      newChanges.push({from: change.from, to: change.to, text: change.text})
      if (newGroup) { for (var prop in change) { if (m = prop.match(/^spans_(\d+)$/)) {
        if (indexOf(newGroup, Number(m[1])) > -1) {
          lst(newChanges)[prop] = change[prop]
          delete change[prop]
        }
      } } }
    }
  }
  return copy
}

// The 'scroll' parameter given to many of these indicated whether
// the new cursor position should be scrolled into view after
// modifying the selection.

// If shift is held or the extend flag is set, extends a range to
// include a given position (and optionally a second position).
// Otherwise, simply returns the range between the given positions.
// Used for cursor motion and such.
function extendRange(range, head, other, extend) {
  if (extend) {
    var anchor = range.anchor
    if (other) {
      var posBefore = cmp(head, anchor) < 0
      if (posBefore != (cmp(other, anchor) < 0)) {
        anchor = head
        head = other
      } else if (posBefore != (cmp(head, other) < 0)) {
        head = other
      }
    }
    return new Range(anchor, head)
  } else {
    return new Range(other || head, head)
  }
}

// Extend the primary selection range, discard the rest.
function extendSelection(doc, head, other, options, extend) {
  if (extend == null) { extend = doc.cm && (doc.cm.display.shift || doc.extend) }
  setSelection(doc, new Selection([extendRange(doc.sel.primary(), head, other, extend)], 0), options)
}

// Extend all selections (pos is an array of selections with length
// equal the number of selections)
function extendSelections(doc, heads, options) {
  var out = []
  var extend = doc.cm && (doc.cm.display.shift || doc.extend)
  for (var i = 0; i < doc.sel.ranges.length; i++)
    { out[i] = extendRange(doc.sel.ranges[i], heads[i], null, extend) }
  var newSel = normalizeSelection(out, doc.sel.primIndex)
  setSelection(doc, newSel, options)
}

// Updates a single range in the selection.
function replaceOneSelection(doc, i, range, options) {
  var ranges = doc.sel.ranges.slice(0)
  ranges[i] = range
  setSelection(doc, normalizeSelection(ranges, doc.sel.primIndex), options)
}

// Reset the selection to a single range.
function setSimpleSelection(doc, anchor, head, options) {
  setSelection(doc, simpleSelection(anchor, head), options)
}

// Give beforeSelectionChange handlers a change to influence a
// selection update.
function filterSelectionChange(doc, sel, options) {
  var obj = {
    ranges: sel.ranges,
    update: function(ranges) {
      var this$1 = this;

      this.ranges = []
      for (var i = 0; i < ranges.length; i++)
        { this$1.ranges[i] = new Range(clipPos(doc, ranges[i].anchor),
                                   clipPos(doc, ranges[i].head)) }
    },
    origin: options && options.origin
  }
  signal(doc, "beforeSelectionChange", doc, obj)
  if (doc.cm) { signal(doc.cm, "beforeSelectionChange", doc.cm, obj) }
  if (obj.ranges != sel.ranges) { return normalizeSelection(obj.ranges, obj.ranges.length - 1) }
  else { return sel }
}

function setSelectionReplaceHistory(doc, sel, options) {
  var done = doc.history.done, last = lst(done)
  if (last && last.ranges) {
    done[done.length - 1] = sel
    setSelectionNoUndo(doc, sel, options)
  } else {
    setSelection(doc, sel, options)
  }
}

// Set a new selection.
function setSelection(doc, sel, options) {
  setSelectionNoUndo(doc, sel, options)
  addSelectionToHistory(doc, doc.sel, doc.cm ? doc.cm.curOp.id : NaN, options)
}

function setSelectionNoUndo(doc, sel, options) {
  if (hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange"))
    { sel = filterSelectionChange(doc, sel, options) }

  var bias = options && options.bias ||
    (cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1)
  setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true))

  if (!(options && options.scroll === false) && doc.cm)
    { ensureCursorVisible(doc.cm) }
}

function setSelectionInner(doc, sel) {
  if (sel.equals(doc.sel)) { return }

  doc.sel = sel

  if (doc.cm) {
    doc.cm.curOp.updateInput = doc.cm.curOp.selectionChanged = true
    signalCursorActivity(doc.cm)
  }
  signalLater(doc, "cursorActivity", doc)
}

// Verify that the selection does not partially select any atomic
// marked ranges.
function reCheckSelection(doc) {
  setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false))
}

// Return a selection that does not partially select any atomic
// ranges.
function skipAtomicInSelection(doc, sel, bias, mayClear) {
  var out
  for (var i = 0; i < sel.ranges.length; i++) {
    var range = sel.ranges[i]
    var old = sel.ranges.length == doc.sel.ranges.length && doc.sel.ranges[i]
    var newAnchor = skipAtomic(doc, range.anchor, old && old.anchor, bias, mayClear)
    var newHead = skipAtomic(doc, range.head, old && old.head, bias, mayClear)
    if (out || newAnchor != range.anchor || newHead != range.head) {
      if (!out) { out = sel.ranges.slice(0, i) }
      out[i] = new Range(newAnchor, newHead)
    }
  }
  return out ? normalizeSelection(out, sel.primIndex) : sel
}

function skipAtomicInner(doc, pos, oldPos, dir, mayClear) {
  var line = getLine(doc, pos.line)
  if (line.markedSpans) { for (var i = 0; i < line.markedSpans.length; ++i) {
    var sp = line.markedSpans[i], m = sp.marker
    if ((sp.from == null || (m.inclusiveLeft ? sp.from <= pos.ch : sp.from < pos.ch)) &&
        (sp.to == null || (m.inclusiveRight ? sp.to >= pos.ch : sp.to > pos.ch))) {
      if (mayClear) {
        signal(m, "beforeCursorEnter")
        if (m.explicitlyCleared) {
          if (!line.markedSpans) { break }
          else {--i; continue}
        }
      }
      if (!m.atomic) { continue }

      if (oldPos) {
        var near = m.find(dir < 0 ? 1 : -1), diff = (void 0)
        if (dir < 0 ? m.inclusiveRight : m.inclusiveLeft)
          { near = movePos(doc, near, -dir, near && near.line == pos.line ? line : null) }
        if (near && near.line == pos.line && (diff = cmp(near, oldPos)) && (dir < 0 ? diff < 0 : diff > 0))
          { return skipAtomicInner(doc, near, pos, dir, mayClear) }
      }

      var far = m.find(dir < 0 ? -1 : 1)
      if (dir < 0 ? m.inclusiveLeft : m.inclusiveRight)
        { far = movePos(doc, far, dir, far.line == pos.line ? line : null) }
      return far ? skipAtomicInner(doc, far, pos, dir, mayClear) : null
    }
  } }
  return pos
}

// Ensure a given position is not inside an atomic range.
function skipAtomic(doc, pos, oldPos, bias, mayClear) {
  var dir = bias || 1
  var found = skipAtomicInner(doc, pos, oldPos, dir, mayClear) ||
      (!mayClear && skipAtomicInner(doc, pos, oldPos, dir, true)) ||
      skipAtomicInner(doc, pos, oldPos, -dir, mayClear) ||
      (!mayClear && skipAtomicInner(doc, pos, oldPos, -dir, true))
  if (!found) {
    doc.cantEdit = true
    return Pos(doc.first, 0)
  }
  return found
}

function movePos(doc, pos, dir, line) {
  if (dir < 0 && pos.ch == 0) {
    if (pos.line > doc.first) { return clipPos(doc, Pos(pos.line - 1)) }
    else { return null }
  } else if (dir > 0 && pos.ch == (line || getLine(doc, pos.line)).text.length) {
    if (pos.line < doc.first + doc.size - 1) { return Pos(pos.line + 1, 0) }
    else { return null }
  } else {
    return new Pos(pos.line, pos.ch + dir)
  }
}

function selectAll(cm) {
  cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll)
}

// UPDATING

// Allow "beforeChange" event handlers to influence a change
function filterChange(doc, change, update) {
  var obj = {
    canceled: false,
    from: change.from,
    to: change.to,
    text: change.text,
    origin: change.origin,
    cancel: function () { return obj.canceled = true; }
  }
  if (update) { obj.update = function (from, to, text, origin) {
    if (from) { obj.from = clipPos(doc, from) }
    if (to) { obj.to = clipPos(doc, to) }
    if (text) { obj.text = text }
    if (origin !== undefined) { obj.origin = origin }
  } }
  signal(doc, "beforeChange", doc, obj)
  if (doc.cm) { signal(doc.cm, "beforeChange", doc.cm, obj) }

  if (obj.canceled) { return null }
  return {from: obj.from, to: obj.to, text: obj.text, origin: obj.origin}
}

// Apply a change to a document, and add it to the document's
// history, and propagating it to all linked documents.
function makeChange(doc, change, ignoreReadOnly) {
  if (doc.cm) {
    if (!doc.cm.curOp) { return operation(doc.cm, makeChange)(doc, change, ignoreReadOnly) }
    if (doc.cm.state.suppressEdits) { return }
  }

  if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {
    change = filterChange(doc, change, true)
    if (!change) { return }
  }

  // Possibly split or suppress the update based on the presence
  // of read-only spans in its range.
  var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to)
  if (split) {
    for (var i = split.length - 1; i >= 0; --i)
      { makeChangeInner(doc, {from: split[i].from, to: split[i].to, text: i ? [""] : change.text, origin: change.origin}) }
  } else {
    makeChangeInner(doc, change)
  }
}

function makeChangeInner(doc, change) {
  if (change.text.length == 1 && change.text[0] == "" && cmp(change.from, change.to) == 0) { return }
  var selAfter = computeSelAfterChange(doc, change)
  addChangeToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN)

  makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change))
  var rebased = []

  linkedDocs(doc, function (doc, sharedHist) {
    if (!sharedHist && indexOf(rebased, doc.history) == -1) {
      rebaseHist(doc.history, change)
      rebased.push(doc.history)
    }
    makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change))
  })
}

// Revert a change stored in a document's history.
function makeChangeFromHistory(doc, type, allowSelectionOnly) {
  var suppress = doc.cm && doc.cm.state.suppressEdits
  if (suppress && !allowSelectionOnly) { return }

  var hist = doc.history, event, selAfter = doc.sel
  var source = type == "undo" ? hist.done : hist.undone, dest = type == "undo" ? hist.undone : hist.done

  // Verify that there is a useable event (so that ctrl-z won't
  // needlessly clear selection events)
  var i = 0
  for (; i < source.length; i++) {
    event = source[i]
    if (allowSelectionOnly ? event.ranges && !event.equals(doc.sel) : !event.ranges)
      { break }
  }
  if (i == source.length) { return }
  hist.lastOrigin = hist.lastSelOrigin = null

  for (;;) {
    event = source.pop()
    if (event.ranges) {
      pushSelectionToHistory(event, dest)
      if (allowSelectionOnly && !event.equals(doc.sel)) {
        setSelection(doc, event, {clearRedo: false})
        return
      }
      selAfter = event
    } else if (suppress) {
      source.push(event)
      return
    } else { break }
  }

  // Build up a reverse change object to add to the opposite history
  // stack (redo when undoing, and vice versa).
  var antiChanges = []
  pushSelectionToHistory(selAfter, dest)
  dest.push({changes: antiChanges, generation: hist.generation})
  hist.generation = event.generation || ++hist.maxGeneration

  var filter = hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")

  var loop = function ( i ) {
    var change = event.changes[i]
    change.origin = type
    if (filter && !filterChange(doc, change, false)) {
      source.length = 0
      return {}
    }

    antiChanges.push(historyChangeFromChange(doc, change))

    var after = i ? computeSelAfterChange(doc, change) : lst(source)
    makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change))
    if (!i && doc.cm) { doc.cm.scrollIntoView({from: change.from, to: changeEnd(change)}) }
    var rebased = []

    // Propagate to the linked documents
    linkedDocs(doc, function (doc, sharedHist) {
      if (!sharedHist && indexOf(rebased, doc.history) == -1) {
        rebaseHist(doc.history, change)
        rebased.push(doc.history)
      }
      makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change))
    })
  };

  for (var i$1 = event.changes.length - 1; i$1 >= 0; --i$1) {
    var returned = loop( i$1 );

    if ( returned ) return returned.v;
  }
}

// Sub-views need their line numbers shifted when text is added
// above or below them in the parent document.
function shiftDoc(doc, distance) {
  if (distance == 0) { return }
  doc.first += distance
  doc.sel = new Selection(map(doc.sel.ranges, function (range) { return new Range(
    Pos(range.anchor.line + distance, range.anchor.ch),
    Pos(range.head.line + distance, range.head.ch)
  ); }), doc.sel.primIndex)
  if (doc.cm) {
    regChange(doc.cm, doc.first, doc.first - distance, distance)
    for (var d = doc.cm.display, l = d.viewFrom; l < d.viewTo; l++)
      { regLineChange(doc.cm, l, "gutter") }
  }
}

// More lower-level change function, handling only a single document
// (not linked ones).
function makeChangeSingleDoc(doc, change, selAfter, spans) {
  if (doc.cm && !doc.cm.curOp)
    { return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans) }

  if (change.to.line < doc.first) {
    shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line))
    return
  }
  if (change.from.line > doc.lastLine()) { return }

  // Clip the change to the size of this doc
  if (change.from.line < doc.first) {
    var shift = change.text.length - 1 - (doc.first - change.from.line)
    shiftDoc(doc, shift)
    change = {from: Pos(doc.first, 0), to: Pos(change.to.line + shift, change.to.ch),
              text: [lst(change.text)], origin: change.origin}
  }
  var last = doc.lastLine()
  if (change.to.line > last) {
    change = {from: change.from, to: Pos(last, getLine(doc, last).text.length),
              text: [change.text[0]], origin: change.origin}
  }

  change.removed = getBetween(doc, change.from, change.to)

  if (!selAfter) { selAfter = computeSelAfterChange(doc, change) }
  if (doc.cm) { makeChangeSingleDocInEditor(doc.cm, change, spans) }
  else { updateDoc(doc, change, spans) }
  setSelectionNoUndo(doc, selAfter, sel_dontScroll)
}

// Handle the interaction of a change to a document with the editor
// that this document is part of.
function makeChangeSingleDocInEditor(cm, change, spans) {
  var doc = cm.doc, display = cm.display, from = change.from, to = change.to

  var recomputeMaxLength = false, checkWidthStart = from.line
  if (!cm.options.lineWrapping) {
    checkWidthStart = lineNo(visualLine(getLine(doc, from.line)))
    doc.iter(checkWidthStart, to.line + 1, function (line) {
      if (line == display.maxLine) {
        recomputeMaxLength = true
        return true
      }
    })
  }

  if (doc.sel.contains(change.from, change.to) > -1)
    { signalCursorActivity(cm) }

  updateDoc(doc, change, spans, estimateHeight(cm))

  if (!cm.options.lineWrapping) {
    doc.iter(checkWidthStart, from.line + change.text.length, function (line) {
      var len = lineLength(line)
      if (len > display.maxLineLength) {
        display.maxLine = line
        display.maxLineLength = len
        display.maxLineChanged = true
        recomputeMaxLength = false
      }
    })
    if (recomputeMaxLength) { cm.curOp.updateMaxLine = true }
  }

  retreatFrontier(doc, from.line)
  startWorker(cm, 400)

  var lendiff = change.text.length - (to.line - from.line) - 1
  // Remember that these lines changed, for updating the display
  if (change.full)
    { regChange(cm) }
  else if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change))
    { regLineChange(cm, from.line, "text") }
  else
    { regChange(cm, from.line, to.line + 1, lendiff) }

  var changesHandler = hasHandler(cm, "changes"), changeHandler = hasHandler(cm, "change")
  if (changeHandler || changesHandler) {
    var obj = {
      from: from, to: to,
      text: change.text,
      removed: change.removed,
      origin: change.origin
    }
    if (changeHandler) { signalLater(cm, "change", cm, obj) }
    if (changesHandler) { (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push(obj) }
  }
  cm.display.selForContextMenu = null
}

function replaceRange(doc, code, from, to, origin) {
  if (!to) { to = from }
  if (cmp(to, from) < 0) { var assign;
    (assign = [to, from], from = assign[0], to = assign[1], assign) }
  if (typeof code == "string") { code = doc.splitLines(code) }
  makeChange(doc, {from: from, to: to, text: code, origin: origin})
}

// Rebasing/resetting history to deal with externally-sourced changes

function rebaseHistSelSingle(pos, from, to, diff) {
  if (to < pos.line) {
    pos.line += diff
  } else if (from < pos.line) {
    pos.line = from
    pos.ch = 0
  }
}

// Tries to rebase an array of history events given a change in the
// document. If the change touches the same lines as the event, the
// event, and everything 'behind' it, is discarded. If the change is
// before the event, the event's positions are updated. Uses a
// copy-on-write scheme for the positions, to avoid having to
// reallocate them all on every rebase, but also avoid problems with
// shared position objects being unsafely updated.
function rebaseHistArray(array, from, to, diff) {
  for (var i = 0; i < array.length; ++i) {
    var sub = array[i], ok = true
    if (sub.ranges) {
      if (!sub.copied) { sub = array[i] = sub.deepCopy(); sub.copied = true }
      for (var j = 0; j < sub.ranges.length; j++) {
        rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff)
        rebaseHistSelSingle(sub.ranges[j].head, from, to, diff)
      }
      continue
    }
    for (var j$1 = 0; j$1 < sub.changes.length; ++j$1) {
      var cur = sub.changes[j$1]
      if (to < cur.from.line) {
        cur.from = Pos(cur.from.line + diff, cur.from.ch)
        cur.to = Pos(cur.to.line + diff, cur.to.ch)
      } else if (from <= cur.to.line) {
        ok = false
        break
      }
    }
    if (!ok) {
      array.splice(0, i + 1)
      i = 0
    }
  }
}

function rebaseHist(hist, change) {
  var from = change.from.line, to = change.to.line, diff = change.text.length - (to - from) - 1
  rebaseHistArray(hist.done, from, to, diff)
  rebaseHistArray(hist.undone, from, to, diff)
}

// Utility for applying a change to a line by handle or number,
// returning the number and optionally registering the line as
// changed.
function changeLine(doc, handle, changeType, op) {
  var no = handle, line = handle
  if (typeof handle == "number") { line = getLine(doc, clipLine(doc, handle)) }
  else { no = lineNo(handle) }
  if (no == null) { return null }
  if (op(line, no) && doc.cm) { regLineChange(doc.cm, no, changeType) }
  return line
}

// The document is represented as a BTree consisting of leaves, with
// chunk of lines in them, and branches, with up to ten leaves or
// other branch nodes below them. The top node is always a branch
// node, and is the document object itself (meaning it has
// additional methods and properties).
//
// All nodes have parent links. The tree is used both to go from
// line numbers to line objects, and to go from objects to numbers.
// It also indexes by height, and is used to convert between height
// and line object, and to find the total height of the document.
//
// See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html

function LeafChunk(lines) {
  var this$1 = this;

  this.lines = lines
  this.parent = null
  var height = 0
  for (var i = 0; i < lines.length; ++i) {
    lines[i].parent = this$1
    height += lines[i].height
  }
  this.height = height
}

LeafChunk.prototype = {
  chunkSize: function chunkSize() { return this.lines.length },

  // Remove the n lines at offset 'at'.
  removeInner: function removeInner(at, n) {
    var this$1 = this;

    for (var i = at, e = at + n; i < e; ++i) {
      var line = this$1.lines[i]
      this$1.height -= line.height
      cleanUpLine(line)
      signalLater(line, "delete")
    }
    this.lines.splice(at, n)
  },

  // Helper used to collapse a small branch into a single leaf.
  collapse: function collapse(lines) {
    lines.push.apply(lines, this.lines)
  },

  // Insert the given array of lines at offset 'at', count them as
  // having the given height.
  insertInner: function insertInner(at, lines, height) {
    var this$1 = this;

    this.height += height
    this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at))
    for (var i = 0; i < lines.length; ++i) { lines[i].parent = this$1 }
  },

  // Used to iterate over a part of the tree.
  iterN: function iterN(at, n, op) {
    var this$1 = this;

    for (var e = at + n; at < e; ++at)
      { if (op(this$1.lines[at])) { return true } }
  }
}

function BranchChunk(children) {
  var this$1 = this;

  this.children = children
  var size = 0, height = 0
  for (var i = 0; i < children.length; ++i) {
    var ch = children[i]
    size += ch.chunkSize(); height += ch.height
    ch.parent = this$1
  }
  this.size = size
  this.height = height
  this.parent = null
}

BranchChunk.prototype = {
  chunkSize: function chunkSize() { return this.size },

  removeInner: function removeInner(at, n) {
    var this$1 = this;

    this.size -= n
    for (var i = 0; i < this.children.length; ++i) {
      var child = this$1.children[i], sz = child.chunkSize()
      if (at < sz) {
        var rm = Math.min(n, sz - at), oldHeight = child.height
        child.removeInner(at, rm)
        this$1.height -= oldHeight - child.height
        if (sz == rm) { this$1.children.splice(i--, 1); child.parent = null }
        if ((n -= rm) == 0) { break }
        at = 0
      } else { at -= sz }
    }
    // If the result is smaller than 25 lines, ensure that it is a
    // single leaf node.
    if (this.size - n < 25 &&
        (this.children.length > 1 || !(this.children[0] instanceof LeafChunk))) {
      var lines = []
      this.collapse(lines)
      this.children = [new LeafChunk(lines)]
      this.children[0].parent = this
    }
  },

  collapse: function collapse(lines) {
    var this$1 = this;

    for (var i = 0; i < this.children.length; ++i) { this$1.children[i].collapse(lines) }
  },

  insertInner: function insertInner(at, lines, height) {
    var this$1 = this;

    this.size += lines.length
    this.height += height
    for (var i = 0; i < this.children.length; ++i) {
      var child = this$1.children[i], sz = child.chunkSize()
      if (at <= sz) {
        child.insertInner(at, lines, height)
        if (child.lines && child.lines.length > 50) {
          // To avoid memory thrashing when child.lines is huge (e.g. first view of a large file), it's never spliced.
          // Instead, small slices are taken. They're taken in order because sequential memory accesses are fastest.
          var remaining = child.lines.length % 25 + 25
          for (var pos = remaining; pos < child.lines.length;) {
            var leaf = new LeafChunk(child.lines.slice(pos, pos += 25))
            child.height -= leaf.height
            this$1.children.splice(++i, 0, leaf)
            leaf.parent = this$1
          }
          child.lines = child.lines.slice(0, remaining)
          this$1.maybeSpill()
        }
        break
      }
      at -= sz
    }
  },

  // When a node has grown, check whether it should be split.
  maybeSpill: function maybeSpill() {
    if (this.children.length <= 10) { return }
    var me = this
    do {
      var spilled = me.children.splice(me.children.length - 5, 5)
      var sibling = new BranchChunk(spilled)
      if (!me.parent) { // Become the parent node
        var copy = new BranchChunk(me.children)
        copy.parent = me
        me.children = [copy, sibling]
        me = copy
     } else {
        me.size -= sibling.size
        me.height -= sibling.height
        var myIndex = indexOf(me.parent.children, me)
        me.parent.children.splice(myIndex + 1, 0, sibling)
      }
      sibling.parent = me.parent
    } while (me.children.length > 10)
    me.parent.maybeSpill()
  },

  iterN: function iterN(at, n, op) {
    var this$1 = this;

    for (var i = 0; i < this.children.length; ++i) {
      var child = this$1.children[i], sz = child.chunkSize()
      if (at < sz) {
        var used = Math.min(n, sz - at)
        if (child.iterN(at, used, op)) { return true }
        if ((n -= used) == 0) { break }
        at = 0
      } else { at -= sz }
    }
  }
}

// Line widgets are block elements displayed above or below a line.

var LineWidget = function(doc, node, options) {
  var this$1 = this;

  if (options) { for (var opt in options) { if (options.hasOwnProperty(opt))
    { this$1[opt] = options[opt] } } }
  this.doc = doc
  this.node = node
};

LineWidget.prototype.clear = function () {
    var this$1 = this;

  var cm = this.doc.cm, ws = this.line.widgets, line = this.line, no = lineNo(line)
  if (no == null || !ws) { return }
  for (var i = 0; i < ws.length; ++i) { if (ws[i] == this$1) { ws.splice(i--, 1) } }
  if (!ws.length) { line.widgets = null }
  var height = widgetHeight(this)
  updateLineHeight(line, Math.max(0, line.height - height))
  if (cm) {
    runInOp(cm, function () {
      adjustScrollWhenAboveVisible(cm, line, -height)
      regLineChange(cm, no, "widget")
    })
    signalLater(cm, "lineWidgetCleared", cm, this, no)
  }
};

LineWidget.prototype.changed = function () {
    var this$1 = this;

  var oldH = this.height, cm = this.doc.cm, line = this.line
  this.height = null
  var diff = widgetHeight(this) - oldH
  if (!diff) { return }
  updateLineHeight(line, line.height + diff)
  if (cm) {
    runInOp(cm, function () {
      cm.curOp.forceUpdate = true
      adjustScrollWhenAboveVisible(cm, line, diff)
      signalLater(cm, "lineWidgetChanged", cm, this$1, lineNo(line))
    })
  }
};
eventMixin(LineWidget)

function adjustScrollWhenAboveVisible(cm, line, diff) {
  if (heightAtLine(line) < ((cm.curOp && cm.curOp.scrollTop) || cm.doc.scrollTop))
    { addToScrollTop(cm, diff) }
}

function addLineWidget(doc, handle, node, options) {
  var widget = new LineWidget(doc, node, options)
  var cm = doc.cm
  if (cm && widget.noHScroll) { cm.display.alignWidgets = true }
  changeLine(doc, handle, "widget", function (line) {
    var widgets = line.widgets || (line.widgets = [])
    if (widget.insertAt == null) { widgets.push(widget) }
    else { widgets.splice(Math.min(widgets.length - 1, Math.max(0, widget.insertAt)), 0, widget) }
    widget.line = line
    if (cm && !lineIsHidden(doc, line)) {
      var aboveVisible = heightAtLine(line) < doc.scrollTop
      updateLineHeight(line, line.height + widgetHeight(widget))
      if (aboveVisible) { addToScrollTop(cm, widget.height) }
      cm.curOp.forceUpdate = true
    }
    return true
  })
  if (cm) { signalLater(cm, "lineWidgetAdded", cm, widget, typeof handle == "number" ? handle : lineNo(handle)) }
  return widget
}

// TEXTMARKERS

// Created with markText and setBookmark methods. A TextMarker is a
// handle that can be used to clear or find a marked position in the
// document. Line objects hold arrays (markedSpans) containing
// {from, to, marker} object pointing to such marker objects, and
// indicating that such a marker is present on that line. Multiple
// lines may point to the same marker when it spans across lines.
// The spans will have null for their from/to properties when the
// marker continues beyond the start/end of the line. Markers have
// links back to the lines they currently touch.

// Collapsed markers have unique ids, in order to be able to order
// them, which is needed for uniquely determining an outer marker
// when they overlap (they may nest, but not partially overlap).
var nextMarkerId = 0

var TextMarker = function(doc, type) {
  this.lines = []
  this.type = type
  this.doc = doc
  this.id = ++nextMarkerId
};

// Clear the marker.
TextMarker.prototype.clear = function () {
    var this$1 = this;

  if (this.explicitlyCleared) { return }
  var cm = this.doc.cm, withOp = cm && !cm.curOp
  if (withOp) { startOperation(cm) }
  if (hasHandler(this, "clear")) {
    var found = this.find()
    if (found) { signalLater(this, "clear", found.from, found.to) }
  }
  var min = null, max = null
  for (var i = 0; i < this.lines.length; ++i) {
    var line = this$1.lines[i]
    var span = getMarkedSpanFor(line.markedSpans, this$1)
    if (cm && !this$1.collapsed) { regLineChange(cm, lineNo(line), "text") }
    else if (cm) {
      if (span.to != null) { max = lineNo(line) }
      if (span.from != null) { min = lineNo(line) }
    }
    line.markedSpans = removeMarkedSpan(line.markedSpans, span)
    if (span.from == null && this$1.collapsed && !lineIsHidden(this$1.doc, line) && cm)
      { updateLineHeight(line, textHeight(cm.display)) }
  }
  if (cm && this.collapsed && !cm.options.lineWrapping) { for (var i$1 = 0; i$1 < this.lines.length; ++i$1) {
    var visual = visualLine(this$1.lines[i$1]), len = lineLength(visual)
    if (len > cm.display.maxLineLength) {
      cm.display.maxLine = visual
      cm.display.maxLineLength = len
      cm.display.maxLineChanged = true
    }
  } }

  if (min != null && cm && this.collapsed) { regChange(cm, min, max + 1) }
  this.lines.length = 0
  this.explicitlyCleared = true
  if (this.atomic && this.doc.cantEdit) {
    this.doc.cantEdit = false
    if (cm) { reCheckSelection(cm.doc) }
  }
  if (cm) { signalLater(cm, "markerCleared", cm, this, min, max) }
  if (withOp) { endOperation(cm) }
  if (this.parent) { this.parent.clear() }
};

// Find the position of the marker in the document. Returns a {from,
// to} object by default. Side can be passed to get a specific side
// -- 0 (both), -1 (left), or 1 (right). When lineObj is true, the
// Pos objects returned contain a line object, rather than a line
// number (used to prevent looking up the same line twice).
TextMarker.prototype.find = function (side, lineObj) {
    var this$1 = this;

  if (side == null && this.type == "bookmark") { side = 1 }
  var from, to
  for (var i = 0; i < this.lines.length; ++i) {
    var line = this$1.lines[i]
    var span = getMarkedSpanFor(line.markedSpans, this$1)
    if (span.from != null) {
      from = Pos(lineObj ? line : lineNo(line), span.from)
      if (side == -1) { return from }
    }
    if (span.to != null) {
      to = Pos(lineObj ? line : lineNo(line), span.to)
      if (side == 1) { return to }
    }
  }
  return from && {from: from, to: to}
};

// Signals that the marker's widget changed, and surrounding layout
// should be recomputed.
TextMarker.prototype.changed = function () {
    var this$1 = this;

  var pos = this.find(-1, true), widget = this, cm = this.doc.cm
  if (!pos || !cm) { return }
  runInOp(cm, function () {
    var line = pos.line, lineN = lineNo(pos.line)
    var view = findViewForLine(cm, lineN)
    if (view) {
      clearLineMeasurementCacheFor(view)
      cm.curOp.selectionChanged = cm.curOp.forceUpdate = true
    }
    cm.curOp.updateMaxLine = true
    if (!lineIsHidden(widget.doc, line) && widget.height != null) {
      var oldHeight = widget.height
      widget.height = null
      var dHeight = widgetHeight(widget) - oldHeight
      if (dHeight)
        { updateLineHeight(line, line.height + dHeight) }
    }
    signalLater(cm, "markerChanged", cm, this$1)
  })
};

TextMarker.prototype.attachLine = function (line) {
  if (!this.lines.length && this.doc.cm) {
    var op = this.doc.cm.curOp
    if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1)
      { (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this) }
  }
  this.lines.push(line)
};

TextMarker.prototype.detachLine = function (line) {
  this.lines.splice(indexOf(this.lines, line), 1)
  if (!this.lines.length && this.doc.cm) {
    var op = this.doc.cm.curOp
    ;(op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this)
  }
};
eventMixin(TextMarker)

// Create a marker, wire it up to the right lines, and
function markText(doc, from, to, options, type) {
  // Shared markers (across linked documents) are handled separately
  // (markTextShared will call out to this again, once per
  // document).
  if (options && options.shared) { return markTextShared(doc, from, to, options, type) }
  // Ensure we are in an operation.
  if (doc.cm && !doc.cm.curOp) { return operation(doc.cm, markText)(doc, from, to, options, type) }

  var marker = new TextMarker(doc, type), diff = cmp(from, to)
  if (options) { copyObj(options, marker, false) }
  // Don't connect empty markers unless clearWhenEmpty is false
  if (diff > 0 || diff == 0 && marker.clearWhenEmpty !== false)
    { return marker }
  if (marker.replacedWith) {
    // Showing up as a widget implies collapsed (widget replaces text)
    marker.collapsed = true
    marker.widgetNode = eltP("span", [marker.replacedWith], "CodeMirror-widget")
    if (!options.handleMouseEvents) { marker.widgetNode.setAttribute("cm-ignore-events", "true") }
    if (options.insertLeft) { marker.widgetNode.insertLeft = true }
  }
  if (marker.collapsed) {
    if (conflictingCollapsedRange(doc, from.line, from, to, marker) ||
        from.line != to.line && conflictingCollapsedRange(doc, to.line, from, to, marker))
      { throw new Error("Inserting collapsed marker partially overlapping an existing one") }
    seeCollapsedSpans()
  }

  if (marker.addToHistory)
    { addChangeToHistory(doc, {from: from, to: to, origin: "markText"}, doc.sel, NaN) }

  var curLine = from.line, cm = doc.cm, updateMaxLine
  doc.iter(curLine, to.line + 1, function (line) {
    if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(line) == cm.display.maxLine)
      { updateMaxLine = true }
    if (marker.collapsed && curLine != from.line) { updateLineHeight(line, 0) }
    addMarkedSpan(line, new MarkedSpan(marker,
                                       curLine == from.line ? from.ch : null,
                                       curLine == to.line ? to.ch : null))
    ++curLine
  })
  // lineIsHidden depends on the presence of the spans, so needs a second pass
  if (marker.collapsed) { doc.iter(from.line, to.line + 1, function (line) {
    if (lineIsHidden(doc, line)) { updateLineHeight(line, 0) }
  }) }

  if (marker.clearOnEnter) { on(marker, "beforeCursorEnter", function () { return marker.clear(); }) }

  if (marker.readOnly) {
    seeReadOnlySpans()
    if (doc.history.done.length || doc.history.undone.length)
      { doc.clearHistory() }
  }
  if (marker.collapsed) {
    marker.id = ++nextMarkerId
    marker.atomic = true
  }
  if (cm) {
    // Sync editor state
    if (updateMaxLine) { cm.curOp.updateMaxLine = true }
    if (marker.collapsed)
      { regChange(cm, from.line, to.line + 1) }
    else if (marker.className || marker.title || marker.startStyle || marker.endStyle || marker.css)
      { for (var i = from.line; i <= to.line; i++) { regLineChange(cm, i, "text") } }
    if (marker.atomic) { reCheckSelection(cm.doc) }
    signalLater(cm, "markerAdded", cm, marker)
  }
  return marker
}

// SHARED TEXTMARKERS

// A shared marker spans multiple linked documents. It is
// implemented as a meta-marker-object controlling multiple normal
// markers.
var SharedTextMarker = function(markers, primary) {
  var this$1 = this;

  this.markers = markers
  this.primary = primary
  for (var i = 0; i < markers.length; ++i)
    { markers[i].parent = this$1 }
};

SharedTextMarker.prototype.clear = function () {
    var this$1 = this;

  if (this.explicitlyCleared) { return }
  this.explicitlyCleared = true
  for (var i = 0; i < this.markers.length; ++i)
    { this$1.markers[i].clear() }
  signalLater(this, "clear")
};

SharedTextMarker.prototype.find = function (side, lineObj) {
  return this.primary.find(side, lineObj)
};
eventMixin(SharedTextMarker)

function markTextShared(doc, from, to, options, type) {
  options = copyObj(options)
  options.shared = false
  var markers = [markText(doc, from, to, options, type)], primary = markers[0]
  var widget = options.widgetNode
  linkedDocs(doc, function (doc) {
    if (widget) { options.widgetNode = widget.cloneNode(true) }
    markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type))
    for (var i = 0; i < doc.linked.length; ++i)
      { if (doc.linked[i].isParent) { return } }
    primary = lst(markers)
  })
  return new SharedTextMarker(markers, primary)
}

function findSharedMarkers(doc) {
  return doc.findMarks(Pos(doc.first, 0), doc.clipPos(Pos(doc.lastLine())), function (m) { return m.parent; })
}

function copySharedMarkers(doc, markers) {
  for (var i = 0; i < markers.length; i++) {
    var marker = markers[i], pos = marker.find()
    var mFrom = doc.clipPos(pos.from), mTo = doc.clipPos(pos.to)
    if (cmp(mFrom, mTo)) {
      var subMark = markText(doc, mFrom, mTo, marker.primary, marker.primary.type)
      marker.markers.push(subMark)
      subMark.parent = marker
    }
  }
}

function detachSharedMarkers(markers) {
  var loop = function ( i ) {
    var marker = markers[i], linked = [marker.primary.doc]
    linkedDocs(marker.primary.doc, function (d) { return linked.push(d); })
    for (var j = 0; j < marker.markers.length; j++) {
      var subMarker = marker.markers[j]
      if (indexOf(linked, subMarker.doc) == -1) {
        subMarker.parent = null
        marker.markers.splice(j--, 1)
      }
    }
  };

  for (var i = 0; i < markers.length; i++) loop( i );
}

var nextDocId = 0
var Doc = function(text, mode, firstLine, lineSep, direction) {
  if (!(this instanceof Doc)) { return new Doc(text, mode, firstLine, lineSep, direction) }
  if (firstLine == null) { firstLine = 0 }

  BranchChunk.call(this, [new LeafChunk([new Line("", null)])])
  this.first = firstLine
  this.scrollTop = this.scrollLeft = 0
  this.cantEdit = false
  this.cleanGeneration = 1
  this.modeFrontier = this.highlightFrontier = firstLine
  var start = Pos(firstLine, 0)
  this.sel = simpleSelection(start)
  this.history = new History(null)
  this.id = ++nextDocId
  this.modeOption = mode
  this.lineSep = lineSep
  this.direction = (direction == "rtl") ? "rtl" : "ltr"
  this.extend = false

  if (typeof text == "string") { text = this.splitLines(text) }
  updateDoc(this, {from: start, to: start, text: text})
  setSelection(this, simpleSelection(start), sel_dontScroll)
}

Doc.prototype = createObj(BranchChunk.prototype, {
  constructor: Doc,
  // Iterate over the document. Supports two forms -- with only one
  // argument, it calls that for each line in the document. With
  // three, it iterates over the range given by the first two (with
  // the second being non-inclusive).
  iter: function(from, to, op) {
    if (op) { this.iterN(from - this.first, to - from, op) }
    else { this.iterN(this.first, this.first + this.size, from) }
  },

  // Non-public interface for adding and removing lines.
  insert: function(at, lines) {
    var height = 0
    for (var i = 0; i < lines.length; ++i) { height += lines[i].height }
    this.insertInner(at - this.first, lines, height)
  },
  remove: function(at, n) { this.removeInner(at - this.first, n) },

  // From here, the methods are part of the public interface. Most
  // are also available from CodeMirror (editor) instances.

  getValue: function(lineSep) {
    var lines = getLines(this, this.first, this.first + this.size)
    if (lineSep === false) { return lines }
    return lines.join(lineSep || this.lineSeparator())
  },
  setValue: docMethodOp(function(code) {
    var top = Pos(this.first, 0), last = this.first + this.size - 1
    makeChange(this, {from: top, to: Pos(last, getLine(this, last).text.length),
                      text: this.splitLines(code), origin: "setValue", full: true}, true)
    if (this.cm) { scrollToCoords(this.cm, 0, 0) }
    setSelection(this, simpleSelection(top), sel_dontScroll)
  }),
  replaceRange: function(code, from, to, origin) {
    from = clipPos(this, from)
    to = to ? clipPos(this, to) : from
    replaceRange(this, code, from, to, origin)
  },
  getRange: function(from, to, lineSep) {
    var lines = getBetween(this, clipPos(this, from), clipPos(this, to))
    if (lineSep === false) { return lines }
    return lines.join(lineSep || this.lineSeparator())
  },

  getLine: function(line) {var l = this.getLineHandle(line); return l && l.text},

  getLineHandle: function(line) {if (isLine(this, line)) { return getLine(this, line) }},
  getLineNumber: function(line) {return lineNo(line)},

  getLineHandleVisualStart: function(line) {
    if (typeof line == "number") { line = getLine(this, line) }
    return visualLine(line)
  },

  lineCount: function() {return this.size},
  firstLine: function() {return this.first},
  lastLine: function() {return this.first + this.size - 1},

  clipPos: function(pos) {return clipPos(this, pos)},

  getCursor: function(start) {
    var range = this.sel.primary(), pos
    if (start == null || start == "head") { pos = range.head }
    else if (start == "anchor") { pos = range.anchor }
    else if (start == "end" || start == "to" || start === false) { pos = range.to() }
    else { pos = range.from() }
    return pos
  },
  listSelections: function() { return this.sel.ranges },
  somethingSelected: function() {return this.sel.somethingSelected()},

  setCursor: docMethodOp(function(line, ch, options) {
    setSimpleSelection(this, clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line), null, options)
  }),
  setSelection: docMethodOp(function(anchor, head, options) {
    setSimpleSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), options)
  }),
  extendSelection: docMethodOp(function(head, other, options) {
    extendSelection(this, clipPos(this, head), other && clipPos(this, other), options)
  }),
  extendSelections: docMethodOp(function(heads, options) {
    extendSelections(this, clipPosArray(this, heads), options)
  }),
  extendSelectionsBy: docMethodOp(function(f, options) {
    var heads = map(this.sel.ranges, f)
    extendSelections(this, clipPosArray(this, heads), options)
  }),
  setSelections: docMethodOp(function(ranges, primary, options) {
    var this$1 = this;

    if (!ranges.length) { return }
    var out = []
    for (var i = 0; i < ranges.length; i++)
      { out[i] = new Range(clipPos(this$1, ranges[i].anchor),
                         clipPos(this$1, ranges[i].head)) }
    if (primary == null) { primary = Math.min(ranges.length - 1, this.sel.primIndex) }
    setSelection(this, normalizeSelection(out, primary), options)
  }),
  addSelection: docMethodOp(function(anchor, head, options) {
    var ranges = this.sel.ranges.slice(0)
    ranges.push(new Range(clipPos(this, anchor), clipPos(this, head || anchor)))
    setSelection(this, normalizeSelection(ranges, ranges.length - 1), options)
  }),

  getSelection: function(lineSep) {
    var this$1 = this;

    var ranges = this.sel.ranges, lines
    for (var i = 0; i < ranges.length; i++) {
      var sel = getBetween(this$1, ranges[i].from(), ranges[i].to())
      lines = lines ? lines.concat(sel) : sel
    }
    if (lineSep === false) { return lines }
    else { return lines.join(lineSep || this.lineSeparator()) }
  },
  getSelections: function(lineSep) {
    var this$1 = this;

    var parts = [], ranges = this.sel.ranges
    for (var i = 0; i < ranges.length; i++) {
      var sel = getBetween(this$1, ranges[i].from(), ranges[i].to())
      if (lineSep !== false) { sel = sel.join(lineSep || this$1.lineSeparator()) }
      parts[i] = sel
    }
    return parts
  },
  replaceSelection: function(code, collapse, origin) {
    var dup = []
    for (var i = 0; i < this.sel.ranges.length; i++)
      { dup[i] = code }
    this.replaceSelections(dup, collapse, origin || "+input")
  },
  replaceSelections: docMethodOp(function(code, collapse, origin) {
    var this$1 = this;

    var changes = [], sel = this.sel
    for (var i = 0; i < sel.ranges.length; i++) {
      var range = sel.ranges[i]
      changes[i] = {from: range.from(), to: range.to(), text: this$1.splitLines(code[i]), origin: origin}
    }
    var newSel = collapse && collapse != "end" && computeReplacedSel(this, changes, collapse)
    for (var i$1 = changes.length - 1; i$1 >= 0; i$1--)
      { makeChange(this$1, changes[i$1]) }
    if (newSel) { setSelectionReplaceHistory(this, newSel) }
    else if (this.cm) { ensureCursorVisible(this.cm) }
  }),
  undo: docMethodOp(function() {makeChangeFromHistory(this, "undo")}),
  redo: docMethodOp(function() {makeChangeFromHistory(this, "redo")}),
  undoSelection: docMethodOp(function() {makeChangeFromHistory(this, "undo", true)}),
  redoSelection: docMethodOp(function() {makeChangeFromHistory(this, "redo", true)}),

  setExtending: function(val) {this.extend = val},
  getExtending: function() {return this.extend},

  historySize: function() {
    var hist = this.history, done = 0, undone = 0
    for (var i = 0; i < hist.done.length; i++) { if (!hist.done[i].ranges) { ++done } }
    for (var i$1 = 0; i$1 < hist.undone.length; i$1++) { if (!hist.undone[i$1].ranges) { ++undone } }
    return {undo: done, redo: undone}
  },
  clearHistory: function() {this.history = new History(this.history.maxGeneration)},

  markClean: function() {
    this.cleanGeneration = this.changeGeneration(true)
  },
  changeGeneration: function(forceSplit) {
    if (forceSplit)
      { this.history.lastOp = this.history.lastSelOp = this.history.lastOrigin = null }
    return this.history.generation
  },
  isClean: function (gen) {
    return this.history.generation == (gen || this.cleanGeneration)
  },

  getHistory: function() {
    return {done: copyHistoryArray(this.history.done),
            undone: copyHistoryArray(this.history.undone)}
  },
  setHistory: function(histData) {
    var hist = this.history = new History(this.history.maxGeneration)
    hist.done = copyHistoryArray(histData.done.slice(0), null, true)
    hist.undone = copyHistoryArray(histData.undone.slice(0), null, true)
  },

  setGutterMarker: docMethodOp(function(line, gutterID, value) {
    return changeLine(this, line, "gutter", function (line) {
      var markers = line.gutterMarkers || (line.gutterMarkers = {})
      markers[gutterID] = value
      if (!value && isEmpty(markers)) { line.gutterMarkers = null }
      return true
    })
  }),

  clearGutter: docMethodOp(function(gutterID) {
    var this$1 = this;

    this.iter(function (line) {
      if (line.gutterMarkers && line.gutterMarkers[gutterID]) {
        changeLine(this$1, line, "gutter", function () {
          line.gutterMarkers[gutterID] = null
          if (isEmpty(line.gutterMarkers)) { line.gutterMarkers = null }
          return true
        })
      }
    })
  }),

  lineInfo: function(line) {
    var n
    if (typeof line == "number") {
      if (!isLine(this, line)) { return null }
      n = line
      line = getLine(this, line)
      if (!line) { return null }
    } else {
      n = lineNo(line)
      if (n == null) { return null }
    }
    return {line: n, handle: line, text: line.text, gutterMarkers: line.gutterMarkers,
            textClass: line.textClass, bgClass: line.bgClass, wrapClass: line.wrapClass,
            widgets: line.widgets}
  },

  addLineClass: docMethodOp(function(handle, where, cls) {
    return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function (line) {
      var prop = where == "text" ? "textClass"
               : where == "background" ? "bgClass"
               : where == "gutter" ? "gutterClass" : "wrapClass"
      if (!line[prop]) { line[prop] = cls }
      else if (classTest(cls).test(line[prop])) { return false }
      else { line[prop] += " " + cls }
      return true
    })
  }),
  removeLineClass: docMethodOp(function(handle, where, cls) {
    return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function (line) {
      var prop = where == "text" ? "textClass"
               : where == "background" ? "bgClass"
               : where == "gutter" ? "gutterClass" : "wrapClass"
      var cur = line[prop]
      if (!cur) { return false }
      else if (cls == null) { line[prop] = null }
      else {
        var found = cur.match(classTest(cls))
        if (!found) { return false }
        var end = found.index + found[0].length
        line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? "" : " ") + cur.slice(end) || null
      }
      return true
    })
  }),

  addLineWidget: docMethodOp(function(handle, node, options) {
    return addLineWidget(this, handle, node, options)
  }),
  removeLineWidget: function(widget) { widget.clear() },

  markText: function(from, to, options) {
    return markText(this, clipPos(this, from), clipPos(this, to), options, options && options.type || "range")
  },
  setBookmark: function(pos, options) {
    var realOpts = {replacedWith: options && (options.nodeType == null ? options.widget : options),
                    insertLeft: options && options.insertLeft,
                    clearWhenEmpty: false, shared: options && options.shared,
                    handleMouseEvents: options && options.handleMouseEvents}
    pos = clipPos(this, pos)
    return markText(this, pos, pos, realOpts, "bookmark")
  },
  findMarksAt: function(pos) {
    pos = clipPos(this, pos)
    var markers = [], spans = getLine(this, pos.line).markedSpans
    if (spans) { for (var i = 0; i < spans.length; ++i) {
      var span = spans[i]
      if ((span.from == null || span.from <= pos.ch) &&
          (span.to == null || span.to >= pos.ch))
        { markers.push(span.marker.parent || span.marker) }
    } }
    return markers
  },
  findMarks: function(from, to, filter) {
    from = clipPos(this, from); to = clipPos(this, to)
    var found = [], lineNo = from.line
    this.iter(from.line, to.line + 1, function (line) {
      var spans = line.markedSpans
      if (spans) { for (var i = 0; i < spans.length; i++) {
        var span = spans[i]
        if (!(span.to != null && lineNo == from.line && from.ch >= span.to ||
              span.from == null && lineNo != from.line ||
              span.from != null && lineNo == to.line && span.from >= to.ch) &&
            (!filter || filter(span.marker)))
          { found.push(span.marker.parent || span.marker) }
      } }
      ++lineNo
    })
    return found
  },
  getAllMarks: function() {
    var markers = []
    this.iter(function (line) {
      var sps = line.markedSpans
      if (sps) { for (var i = 0; i < sps.length; ++i)
        { if (sps[i].from != null) { markers.push(sps[i].marker) } } }
    })
    return markers
  },

  posFromIndex: function(off) {
    var ch, lineNo = this.first, sepSize = this.lineSeparator().length
    this.iter(function (line) {
      var sz = line.text.length + sepSize
      if (sz > off) { ch = off; return true }
      off -= sz
      ++lineNo
    })
    return clipPos(this, Pos(lineNo, ch))
  },
  indexFromPos: function (coords) {
    coords = clipPos(this, coords)
    var index = coords.ch
    if (coords.line < this.first || coords.ch < 0) { return 0 }
    var sepSize = this.lineSeparator().length
    this.iter(this.first, coords.line, function (line) { // iter aborts when callback returns a truthy value
      index += line.text.length + sepSize
    })
    return index
  },

  copy: function(copyHistory) {
    var doc = new Doc(getLines(this, this.first, this.first + this.size),
                      this.modeOption, this.first, this.lineSep, this.direction)
    doc.scrollTop = this.scrollTop; doc.scrollLeft = this.scrollLeft
    doc.sel = this.sel
    doc.extend = false
    if (copyHistory) {
      doc.history.undoDepth = this.history.undoDepth
      doc.setHistory(this.getHistory())
    }
    return doc
  },

  linkedDoc: function(options) {
    if (!options) { options = {} }
    var from = this.first, to = this.first + this.size
    if (options.from != null && options.from > from) { from = options.from }
    if (options.to != null && options.to < to) { to = options.to }
    var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from, this.lineSep, this.direction)
    if (options.sharedHist) { copy.history = this.history
    ; }(this.linked || (this.linked = [])).push({doc: copy, sharedHist: options.sharedHist})
    copy.linked = [{doc: this, isParent: true, sharedHist: options.sharedHist}]
    copySharedMarkers(copy, findSharedMarkers(this))
    return copy
  },
  unlinkDoc: function(other) {
    var this$1 = this;

    if (other instanceof CodeMirror) { other = other.doc }
    if (this.linked) { for (var i = 0; i < this.linked.length; ++i) {
      var link = this$1.linked[i]
      if (link.doc != other) { continue }
      this$1.linked.splice(i, 1)
      other.unlinkDoc(this$1)
      detachSharedMarkers(findSharedMarkers(this$1))
      break
    } }
    // If the histories were shared, split them again
    if (other.history == this.history) {
      var splitIds = [other.id]
      linkedDocs(other, function (doc) { return splitIds.push(doc.id); }, true)
      other.history = new History(null)
      other.history.done = copyHistoryArray(this.history.done, splitIds)
      other.history.undone = copyHistoryArray(this.history.undone, splitIds)
    }
  },
  iterLinkedDocs: function(f) {linkedDocs(this, f)},

  getMode: function() {return this.mode},
  getEditor: function() {return this.cm},

  splitLines: function(str) {
    if (this.lineSep) { return str.split(this.lineSep) }
    return splitLinesAuto(str)
  },
  lineSeparator: function() { return this.lineSep || "\n" },

  setDirection: docMethodOp(function (dir) {
    if (dir != "rtl") { dir = "ltr" }
    if (dir == this.direction) { return }
    this.direction = dir
    this.iter(function (line) { return line.order = null; })
    if (this.cm) { directionChanged(this.cm) }
  })
})

// Public alias.
Doc.prototype.eachLine = Doc.prototype.iter

// Kludge to work around strange IE behavior where it'll sometimes
// re-fire a series of drag-related events right after the drop (#1551)
var lastDrop = 0

function onDrop(e) {
  var cm = this
  clearDragCursor(cm)
  if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e))
    { return }
  e_preventDefault(e)
  if (ie) { lastDrop = +new Date }
  var pos = posFromMouse(cm, e, true), files = e.dataTransfer.files
  if (!pos || cm.isReadOnly()) { return }
  // Might be a file drop, in which case we simply extract the text
  // and insert it.
  if (files && files.length && window.FileReader && window.File) {
    var n = files.length, text = Array(n), read = 0
    var loadFile = function (file, i) {
      if (cm.options.allowDropFileTypes &&
          indexOf(cm.options.allowDropFileTypes, file.type) == -1)
        { return }

      var reader = new FileReader
      reader.onload = operation(cm, function () {
        var content = reader.result
        if (/[\x00-\x08\x0e-\x1f]{2}/.test(content)) { content = "" }
        text[i] = content
        if (++read == n) {
          pos = clipPos(cm.doc, pos)
          var change = {from: pos, to: pos,
                        text: cm.doc.splitLines(text.join(cm.doc.lineSeparator())),
                        origin: "paste"}
          makeChange(cm.doc, change)
          setSelectionReplaceHistory(cm.doc, simpleSelection(pos, changeEnd(change)))
        }
      })
      reader.readAsText(file)
    }
    for (var i = 0; i < n; ++i) { loadFile(files[i], i) }
  } else { // Normal drop
    // Don't do a replace if the drop happened inside of the selected text.
    if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {
      cm.state.draggingText(e)
      // Ensure the editor is re-focused
      setTimeout(function () { return cm.display.input.focus(); }, 20)
      return
    }
    try {
      var text$1 = e.dataTransfer.getData("Text")
      if (text$1) {
        var selected
        if (cm.state.draggingText && !cm.state.draggingText.copy)
          { selected = cm.listSelections() }
        setSelectionNoUndo(cm.doc, simpleSelection(pos, pos))
        if (selected) { for (var i$1 = 0; i$1 < selected.length; ++i$1)
          { replaceRange(cm.doc, "", selected[i$1].anchor, selected[i$1].head, "drag") } }
        cm.replaceSelection(text$1, "around", "paste")
        cm.display.input.focus()
      }
    }
    catch(e){}
  }
}

function onDragStart(cm, e) {
  if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) { e_stop(e); return }
  if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) { return }

  e.dataTransfer.setData("Text", cm.getSelection())
  e.dataTransfer.effectAllowed = "copyMove"

  // Use dummy image instead of default browsers image.
  // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.
  if (e.dataTransfer.setDragImage && !safari) {
    var img = elt("img", null, null, "position: fixed; left: 0; top: 0;")
    img.src = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw=="
    if (presto) {
      img.width = img.height = 1
      cm.display.wrapper.appendChild(img)
      // Force a relayout, or Opera won't use our image for some obscure reason
      img._top = img.offsetTop
    }
    e.dataTransfer.setDragImage(img, 0, 0)
    if (presto) { img.parentNode.removeChild(img) }
  }
}

function onDragOver(cm, e) {
  var pos = posFromMouse(cm, e)
  if (!pos) { return }
  var frag = document.createDocumentFragment()
  drawSelectionCursor(cm, pos, frag)
  if (!cm.display.dragCursor) {
    cm.display.dragCursor = elt("div", null, "CodeMirror-cursors CodeMirror-dragcursors")
    cm.display.lineSpace.insertBefore(cm.display.dragCursor, cm.display.cursorDiv)
  }
  removeChildrenAndAdd(cm.display.dragCursor, frag)
}

function clearDragCursor(cm) {
  if (cm.display.dragCursor) {
    cm.display.lineSpace.removeChild(cm.display.dragCursor)
    cm.display.dragCursor = null
  }
}

// These must be handled carefully, because naively registering a
// handler for each editor will cause the editors to never be
// garbage collected.

function forEachCodeMirror(f) {
  if (!document.getElementsByClassName) { return }
  var byClass = document.getElementsByClassName("CodeMirror")
  for (var i = 0; i < byClass.length; i++) {
    var cm = byClass[i].CodeMirror
    if (cm) { f(cm) }
  }
}

var globalsRegistered = false
function ensureGlobalHandlers() {
  if (globalsRegistered) { return }
  registerGlobalHandlers()
  globalsRegistered = true
}
function registerGlobalHandlers() {
  // When the window resizes, we need to refresh active editors.
  var resizeTimer
  on(window, "resize", function () {
    if (resizeTimer == null) { resizeTimer = setTimeout(function () {
      resizeTimer = null
      forEachCodeMirror(onResize)
    }, 100) }
  })
  // When the window loses focus, we want to show the editor as blurred
  on(window, "blur", function () { return forEachCodeMirror(onBlur); })
}
// Called when the window resizes
function onResize(cm) {
  var d = cm.display
  if (d.lastWrapHeight == d.wrapper.clientHeight && d.lastWrapWidth == d.wrapper.clientWidth)
    { return }
  // Might be a text scaling operation, clear size caches.
  d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null
  d.scrollbarsClipped = false
  cm.setSize()
}

var keyNames = {
  3: "Pause", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
  19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
  36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
  46: "Delete", 59: ";", 61: "=", 91: "Mod", 92: "Mod", 93: "Mod",
  106: "*", 107: "=", 109: "-", 110: ".", 111: "/", 127: "Delete", 145: "ScrollLock",
  173: "-", 186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",
  221: "]", 222: "'", 63232: "Up", 63233: "Down", 63234: "Left", 63235: "Right", 63272: "Delete",
  63273: "Home", 63275: "End", 63276: "PageUp", 63277: "PageDown", 63302: "Insert"
}

// Number keys
for (var i = 0; i < 10; i++) { keyNames[i + 48] = keyNames[i + 96] = String(i) }
// Alphabetic keys
for (var i$1 = 65; i$1 <= 90; i$1++) { keyNames[i$1] = String.fromCharCode(i$1) }
// Function keys
for (var i$2 = 1; i$2 <= 12; i$2++) { keyNames[i$2 + 111] = keyNames[i$2 + 63235] = "F" + i$2 }

var keyMap = {}

keyMap.basic = {
  "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
  "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
  "Delete": "delCharAfter", "Backspace": "delCharBefore", "Shift-Backspace": "delCharBefore",
  "Tab": "defaultTab", "Shift-Tab": "indentAuto",
  "Enter": "newlineAndIndent", "Insert": "toggleOverwrite",
  "Esc": "singleSelection"
}
// Note that the save and find-related commands aren't defined by
// default. User code or addons can define them. Unknown commands
// are simply ignored.
keyMap.pcDefault = {
  "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",
  "Ctrl-Home": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Up": "goLineUp", "Ctrl-Down": "goLineDown",
  "Ctrl-Left": "goGroupLeft", "Ctrl-Right": "goGroupRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
  "Ctrl-Backspace": "delGroupBefore", "Ctrl-Delete": "delGroupAfter", "Ctrl-S": "save", "Ctrl-F": "find",
  "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
  "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
  "Ctrl-U": "undoSelection", "Shift-Ctrl-U": "redoSelection", "Alt-U": "redoSelection",
  fallthrough: "basic"
}
// Very basic readline/emacs-style bindings, which are standard on Mac.
keyMap.emacsy = {
  "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
  "Alt-F": "goWordRight", "Alt-B": "goWordLeft", "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",
  "Ctrl-V": "goPageDown", "Shift-Ctrl-V": "goPageUp", "Ctrl-D": "delCharAfter", "Ctrl-H": "delCharBefore",
  "Alt-D": "delWordAfter", "Alt-Backspace": "delWordBefore", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars",
  "Ctrl-O": "openLine"
}
keyMap.macDefault = {
  "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
  "Cmd-Home": "goDocStart", "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goGroupLeft",
  "Alt-Right": "goGroupRight", "Cmd-Left": "goLineLeft", "Cmd-Right": "goLineRight", "Alt-Backspace": "delGroupBefore",
  "Ctrl-Alt-Backspace": "delGroupAfter", "Alt-Delete": "delGroupAfter", "Cmd-S": "save", "Cmd-F": "find",
  "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
  "Cmd-[": "indentLess", "Cmd-]": "indentMore", "Cmd-Backspace": "delWrappedLineLeft", "Cmd-Delete": "delWrappedLineRight",
  "Cmd-U": "undoSelection", "Shift-Cmd-U": "redoSelection", "Ctrl-Up": "goDocStart", "Ctrl-Down": "goDocEnd",
  fallthrough: ["basic", "emacsy"]
}
keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault

// KEYMAP DISPATCH

function normalizeKeyName(name) {
  var parts = name.split(/-(?!$)/)
  name = parts[parts.length - 1]
  var alt, ctrl, shift, cmd
  for (var i = 0; i < parts.length - 1; i++) {
    var mod = parts[i]
    if (/^(cmd|meta|m)$/i.test(mod)) { cmd = true }
    else if (/^a(lt)?$/i.test(mod)) { alt = true }
    else if (/^(c|ctrl|control)$/i.test(mod)) { ctrl = true }
    else if (/^s(hift)?$/i.test(mod)) { shift = true }
    else { throw new Error("Unrecognized modifier name: " + mod) }
  }
  if (alt) { name = "Alt-" + name }
  if (ctrl) { name = "Ctrl-" + name }
  if (cmd) { name = "Cmd-" + name }
  if (shift) { name = "Shift-" + name }
  return name
}

// This is a kludge to keep keymaps mostly working as raw objects
// (backwards compatibility) while at the same time support features
// like normalization and multi-stroke key bindings. It compiles a
// new normalized keymap, and then updates the old object to reflect
// this.
function normalizeKeyMap(keymap) {
  var copy = {}
  for (var keyname in keymap) { if (keymap.hasOwnProperty(keyname)) {
    var value = keymap[keyname]
    if (/^(name|fallthrough|(de|at)tach)$/.test(keyname)) { continue }
    if (value == "...") { delete keymap[keyname]; continue }

    var keys = map(keyname.split(" "), normalizeKeyName)
    for (var i = 0; i < keys.length; i++) {
      var val = (void 0), name = (void 0)
      if (i == keys.length - 1) {
        name = keys.join(" ")
        val = value
      } else {
        name = keys.slice(0, i + 1).join(" ")
        val = "..."
      }
      var prev = copy[name]
      if (!prev) { copy[name] = val }
      else if (prev != val) { throw new Error("Inconsistent bindings for " + name) }
    }
    delete keymap[keyname]
  } }
  for (var prop in copy) { keymap[prop] = copy[prop] }
  return keymap
}

function lookupKey(key, map, handle, context) {
  map = getKeyMap(map)
  var found = map.call ? map.call(key, context) : map[key]
  if (found === false) { return "nothing" }
  if (found === "...") { return "multi" }
  if (found != null && handle(found)) { return "handled" }

  if (map.fallthrough) {
    if (Object.prototype.toString.call(map.fallthrough) != "[object Array]")
      { return lookupKey(key, map.fallthrough, handle, context) }
    for (var i = 0; i < map.fallthrough.length; i++) {
      var result = lookupKey(key, map.fallthrough[i], handle, context)
      if (result) { return result }
    }
  }
}

// Modifier key presses don't count as 'real' key presses for the
// purpose of keymap fallthrough.
function isModifierKey(value) {
  var name = typeof value == "string" ? value : keyNames[value.keyCode]
  return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod"
}

function addModifierNames(name, event, noShift) {
  var base = name
  if (event.altKey && base != "Alt") { name = "Alt-" + name }
  if ((flipCtrlCmd ? event.metaKey : event.ctrlKey) && base != "Ctrl") { name = "Ctrl-" + name }
  if ((flipCtrlCmd ? event.ctrlKey : event.metaKey) && base != "Cmd") { name = "Cmd-" + name }
  if (!noShift && event.shiftKey && base != "Shift") { name = "Shift-" + name }
  return name
}

// Look up the name of a key as indicated by an event object.
function keyName(event, noShift) {
  if (presto && event.keyCode == 34 && event["char"]) { return false }
  var name = keyNames[event.keyCode]
  if (name == null || event.altGraphKey) { return false }
  // Ctrl-ScrollLock has keyCode 3, same as Ctrl-Pause,
  // so we'll use event.code when available (Chrome 48+, FF 38+, Safari 10.1+)
  if (event.keyCode == 3 && event.code) { name = event.code }
  return addModifierNames(name, event, noShift)
}

function getKeyMap(val) {
  return typeof val == "string" ? keyMap[val] : val
}

// Helper for deleting text near the selection(s), used to implement
// backspace, delete, and similar functionality.
function deleteNearSelection(cm, compute) {
  var ranges = cm.doc.sel.ranges, kill = []
  // Build up a set of ranges to kill first, merging overlapping
  // ranges.
  for (var i = 0; i < ranges.length; i++) {
    var toKill = compute(ranges[i])
    while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {
      var replaced = kill.pop()
      if (cmp(replaced.from, toKill.from) < 0) {
        toKill.from = replaced.from
        break
      }
    }
    kill.push(toKill)
  }
  // Next, remove those actual ranges.
  runInOp(cm, function () {
    for (var i = kill.length - 1; i >= 0; i--)
      { replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete") }
    ensureCursorVisible(cm)
  })
}

function moveCharLogically(line, ch, dir) {
  var target = skipExtendingChars(line.text, ch + dir, dir)
  return target < 0 || target > line.text.length ? null : target
}

function moveLogically(line, start, dir) {
  var ch = moveCharLogically(line, start.ch, dir)
  return ch == null ? null : new Pos(start.line, ch, dir < 0 ? "after" : "before")
}

function endOfLine(visually, cm, lineObj, lineNo, dir) {
  if (visually) {
    var order = getOrder(lineObj, cm.doc.direction)
    if (order) {
      var part = dir < 0 ? lst(order) : order[0]
      var moveInStorageOrder = (dir < 0) == (part.level == 1)
      var sticky = moveInStorageOrder ? "after" : "before"
      var ch
      // With a wrapped rtl chunk (possibly spanning multiple bidi parts),
      // it could be that the last bidi part is not on the last visual line,
      // since visual lines contain content order-consecutive chunks.
      // Thus, in rtl, we are looking for the first (content-order) character
      // in the rtl chunk that is on the last line (that is, the same line
      // as the last (content-order) character).
      if (part.level > 0 || cm.doc.direction == "rtl") {
        var prep = prepareMeasureForLine(cm, lineObj)
        ch = dir < 0 ? lineObj.text.length - 1 : 0
        var targetTop = measureCharPrepared(cm, prep, ch).top
        ch = findFirst(function (ch) { return measureCharPrepared(cm, prep, ch).top == targetTop; }, (dir < 0) == (part.level == 1) ? part.from : part.to - 1, ch)
        if (sticky == "before") { ch = moveCharLogically(lineObj, ch, 1) }
      } else { ch = dir < 0 ? part.to : part.from }
      return new Pos(lineNo, ch, sticky)
    }
  }
  return new Pos(lineNo, dir < 0 ? lineObj.text.length : 0, dir < 0 ? "before" : "after")
}

function moveVisually(cm, line, start, dir) {
  var bidi = getOrder(line, cm.doc.direction)
  if (!bidi) { return moveLogically(line, start, dir) }
  if (start.ch >= line.text.length) {
    start.ch = line.text.length
    start.sticky = "before"
  } else if (start.ch <= 0) {
    start.ch = 0
    start.sticky = "after"
  }
  var partPos = getBidiPartAt(bidi, start.ch, start.sticky), part = bidi[partPos]
  if (cm.doc.direction == "ltr" && part.level % 2 == 0 && (dir > 0 ? part.to > start.ch : part.from < start.ch)) {
    // Case 1: We move within an ltr part in an ltr editor. Even with wrapped lines,
    // nothing interesting happens.
    return moveLogically(line, start, dir)
  }

  var mv = function (pos, dir) { return moveCharLogically(line, pos instanceof Pos ? pos.ch : pos, dir); }
  var prep
  var getWrappedLineExtent = function (ch) {
    if (!cm.options.lineWrapping) { return {begin: 0, end: line.text.length} }
    prep = prep || prepareMeasureForLine(cm, line)
    return wrappedLineExtentChar(cm, line, prep, ch)
  }
  var wrappedLineExtent = getWrappedLineExtent(start.sticky == "before" ? mv(start, -1) : start.ch)

  if (cm.doc.direction == "rtl" || part.level == 1) {
    var moveInStorageOrder = (part.level == 1) == (dir < 0)
    var ch = mv(start, moveInStorageOrder ? 1 : -1)
    if (ch != null && (!moveInStorageOrder ? ch >= part.from && ch >= wrappedLineExtent.begin : ch <= part.to && ch <= wrappedLineExtent.end)) {
      // Case 2: We move within an rtl part or in an rtl editor on the same visual line
      var sticky = moveInStorageOrder ? "before" : "after"
      return new Pos(start.line, ch, sticky)
    }
  }

  // Case 3: Could not move within this bidi part in this visual line, so leave
  // the current bidi part

  var searchInVisualLine = function (partPos, dir, wrappedLineExtent) {
    var getRes = function (ch, moveInStorageOrder) { return moveInStorageOrder
      ? new Pos(start.line, mv(ch, 1), "before")
      : new Pos(start.line, ch, "after"); }

    for (; partPos >= 0 && partPos < bidi.length; partPos += dir) {
      var part = bidi[partPos]
      var moveInStorageOrder = (dir > 0) == (part.level != 1)
      var ch = moveInStorageOrder ? wrappedLineExtent.begin : mv(wrappedLineExtent.end, -1)
      if (part.from <= ch && ch < part.to) { return getRes(ch, moveInStorageOrder) }
      ch = moveInStorageOrder ? part.from : mv(part.to, -1)
      if (wrappedLineExtent.begin <= ch && ch < wrappedLineExtent.end) { return getRes(ch, moveInStorageOrder) }
    }
  }

  // Case 3a: Look for other bidi parts on the same visual line
  var res = searchInVisualLine(partPos + dir, dir, wrappedLineExtent)
  if (res) { return res }

  // Case 3b: Look for other bidi parts on the next visual line
  var nextCh = dir > 0 ? wrappedLineExtent.end : mv(wrappedLineExtent.begin, -1)
  if (nextCh != null && !(dir > 0 && nextCh == line.text.length)) {
    res = searchInVisualLine(dir > 0 ? 0 : bidi.length - 1, dir, getWrappedLineExtent(nextCh))
    if (res) { return res }
  }

  // Case 4: Nowhere to move
  return null
}

// Commands are parameter-less actions that can be performed on an
// editor, mostly used for keybindings.
var commands = {
  selectAll: selectAll,
  singleSelection: function (cm) { return cm.setSelection(cm.getCursor("anchor"), cm.getCursor("head"), sel_dontScroll); },
  killLine: function (cm) { return deleteNearSelection(cm, function (range) {
    if (range.empty()) {
      var len = getLine(cm.doc, range.head.line).text.length
      if (range.head.ch == len && range.head.line < cm.lastLine())
        { return {from: range.head, to: Pos(range.head.line + 1, 0)} }
      else
        { return {from: range.head, to: Pos(range.head.line, len)} }
    } else {
      return {from: range.from(), to: range.to()}
    }
  }); },
  deleteLine: function (cm) { return deleteNearSelection(cm, function (range) { return ({
    from: Pos(range.from().line, 0),
    to: clipPos(cm.doc, Pos(range.to().line + 1, 0))
  }); }); },
  delLineLeft: function (cm) { return deleteNearSelection(cm, function (range) { return ({
    from: Pos(range.from().line, 0), to: range.from()
  }); }); },
  delWrappedLineLeft: function (cm) { return deleteNearSelection(cm, function (range) {
    var top = cm.charCoords(range.head, "div").top + 5
    var leftPos = cm.coordsChar({left: 0, top: top}, "div")
    return {from: leftPos, to: range.from()}
  }); },
  delWrappedLineRight: function (cm) { return deleteNearSelection(cm, function (range) {
    var top = cm.charCoords(range.head, "div").top + 5
    var rightPos = cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div")
    return {from: range.from(), to: rightPos }
  }); },
  undo: function (cm) { return cm.undo(); },
  redo: function (cm) { return cm.redo(); },
  undoSelection: function (cm) { return cm.undoSelection(); },
  redoSelection: function (cm) { return cm.redoSelection(); },
  goDocStart: function (cm) { return cm.extendSelection(Pos(cm.firstLine(), 0)); },
  goDocEnd: function (cm) { return cm.extendSelection(Pos(cm.lastLine())); },
  goLineStart: function (cm) { return cm.extendSelectionsBy(function (range) { return lineStart(cm, range.head.line); },
    {origin: "+move", bias: 1}
  ); },
  goLineStartSmart: function (cm) { return cm.extendSelectionsBy(function (range) { return lineStartSmart(cm, range.head); },
    {origin: "+move", bias: 1}
  ); },
  goLineEnd: function (cm) { return cm.extendSelectionsBy(function (range) { return lineEnd(cm, range.head.line); },
    {origin: "+move", bias: -1}
  ); },
  goLineRight: function (cm) { return cm.extendSelectionsBy(function (range) {
    var top = cm.cursorCoords(range.head, "div").top + 5
    return cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div")
  }, sel_move); },
  goLineLeft: function (cm) { return cm.extendSelectionsBy(function (range) {
    var top = cm.cursorCoords(range.head, "div").top + 5
    return cm.coordsChar({left: 0, top: top}, "div")
  }, sel_move); },
  goLineLeftSmart: function (cm) { return cm.extendSelectionsBy(function (range) {
    var top = cm.cursorCoords(range.head, "div").top + 5
    var pos = cm.coordsChar({left: 0, top: top}, "div")
    if (pos.ch < cm.getLine(pos.line).search(/\S/)) { return lineStartSmart(cm, range.head) }
    return pos
  }, sel_move); },
  goLineUp: function (cm) { return cm.moveV(-1, "line"); },
  goLineDown: function (cm) { return cm.moveV(1, "line"); },
  goPageUp: function (cm) { return cm.moveV(-1, "page"); },
  goPageDown: function (cm) { return cm.moveV(1, "page"); },
  goCharLeft: function (cm) { return cm.moveH(-1, "char"); },
  goCharRight: function (cm) { return cm.moveH(1, "char"); },
  goColumnLeft: function (cm) { return cm.moveH(-1, "column"); },
  goColumnRight: function (cm) { return cm.moveH(1, "column"); },
  goWordLeft: function (cm) { return cm.moveH(-1, "word"); },
  goGroupRight: function (cm) { return cm.moveH(1, "group"); },
  goGroupLeft: function (cm) { return cm.moveH(-1, "group"); },
  goWordRight: function (cm) { return cm.moveH(1, "word"); },
  delCharBefore: function (cm) { return cm.deleteH(-1, "char"); },
  delCharAfter: function (cm) { return cm.deleteH(1, "char"); },
  delWordBefore: function (cm) { return cm.deleteH(-1, "word"); },
  delWordAfter: function (cm) { return cm.deleteH(1, "word"); },
  delGroupBefore: function (cm) { return cm.deleteH(-1, "group"); },
  delGroupAfter: function (cm) { return cm.deleteH(1, "group"); },
  indentAuto: function (cm) { return cm.indentSelection("smart"); },
  indentMore: function (cm) { return cm.indentSelection("add"); },
  indentLess: function (cm) { return cm.indentSelection("subtract"); },
  insertTab: function (cm) { return cm.replaceSelection("\t"); },
  insertSoftTab: function (cm) {
    var spaces = [], ranges = cm.listSelections(), tabSize = cm.options.tabSize
    for (var i = 0; i < ranges.length; i++) {
      var pos = ranges[i].from()
      var col = countColumn(cm.getLine(pos.line), pos.ch, tabSize)
      spaces.push(spaceStr(tabSize - col % tabSize))
    }
    cm.replaceSelections(spaces)
  },
  defaultTab: function (cm) {
    if (cm.somethingSelected()) { cm.indentSelection("add") }
    else { cm.execCommand("insertTab") }
  },
  // Swap the two chars left and right of each selection's head.
  // Move cursor behind the two swapped characters afterwards.
  //
  // Doesn't consider line feeds a character.
  // Doesn't scan more than one line above to find a character.
  // Doesn't do anything on an empty line.
  // Doesn't do anything with non-empty selections.
  transposeChars: function (cm) { return runInOp(cm, function () {
    var ranges = cm.listSelections(), newSel = []
    for (var i = 0; i < ranges.length; i++) {
      if (!ranges[i].empty()) { continue }
      var cur = ranges[i].head, line = getLine(cm.doc, cur.line).text
      if (line) {
        if (cur.ch == line.length) { cur = new Pos(cur.line, cur.ch - 1) }
        if (cur.ch > 0) {
          cur = new Pos(cur.line, cur.ch + 1)
          cm.replaceRange(line.charAt(cur.ch - 1) + line.charAt(cur.ch - 2),
                          Pos(cur.line, cur.ch - 2), cur, "+transpose")
        } else if (cur.line > cm.doc.first) {
          var prev = getLine(cm.doc, cur.line - 1).text
          if (prev) {
            cur = new Pos(cur.line, 1)
            cm.replaceRange(line.charAt(0) + cm.doc.lineSeparator() +
                            prev.charAt(prev.length - 1),
                            Pos(cur.line - 1, prev.length - 1), cur, "+transpose")
          }
        }
      }
      newSel.push(new Range(cur, cur))
    }
    cm.setSelections(newSel)
  }); },
  newlineAndIndent: function (cm) { return runInOp(cm, function () {
    var sels = cm.listSelections()
    for (var i = sels.length - 1; i >= 0; i--)
      { cm.replaceRange(cm.doc.lineSeparator(), sels[i].anchor, sels[i].head, "+input") }
    sels = cm.listSelections()
    for (var i$1 = 0; i$1 < sels.length; i$1++)
      { cm.indentLine(sels[i$1].from().line, null, true) }
    ensureCursorVisible(cm)
  }); },
  openLine: function (cm) { return cm.replaceSelection("\n", "start"); },
  toggleOverwrite: function (cm) { return cm.toggleOverwrite(); }
}


function lineStart(cm, lineN) {
  var line = getLine(cm.doc, lineN)
  var visual = visualLine(line)
  if (visual != line) { lineN = lineNo(visual) }
  return endOfLine(true, cm, visual, lineN, 1)
}
function lineEnd(cm, lineN) {
  var line = getLine(cm.doc, lineN)
  var visual = visualLineEnd(line)
  if (visual != line) { lineN = lineNo(visual) }
  return endOfLine(true, cm, line, lineN, -1)
}
function lineStartSmart(cm, pos) {
  var start = lineStart(cm, pos.line)
  var line = getLine(cm.doc, start.line)
  var order = getOrder(line, cm.doc.direction)
  if (!order || order[0].level == 0) {
    var firstNonWS = Math.max(0, line.text.search(/\S/))
    var inWS = pos.line == start.line && pos.ch <= firstNonWS && pos.ch
    return Pos(start.line, inWS ? 0 : firstNonWS, start.sticky)
  }
  return start
}

// Run a handler that was bound to a key.
function doHandleBinding(cm, bound, dropShift) {
  if (typeof bound == "string") {
    bound = commands[bound]
    if (!bound) { return false }
  }
  // Ensure previous input has been read, so that the handler sees a
  // consistent view of the document
  cm.display.input.ensurePolled()
  var prevShift = cm.display.shift, done = false
  try {
    if (cm.isReadOnly()) { cm.state.suppressEdits = true }
    if (dropShift) { cm.display.shift = false }
    done = bound(cm) != Pass
  } finally {
    cm.display.shift = prevShift
    cm.state.suppressEdits = false
  }
  return done
}

function lookupKeyForEditor(cm, name, handle) {
  for (var i = 0; i < cm.state.keyMaps.length; i++) {
    var result = lookupKey(name, cm.state.keyMaps[i], handle, cm)
    if (result) { return result }
  }
  return (cm.options.extraKeys && lookupKey(name, cm.options.extraKeys, handle, cm))
    || lookupKey(name, cm.options.keyMap, handle, cm)
}

// Note that, despite the name, this function is also used to check
// for bound mouse clicks.

var stopSeq = new Delayed

function dispatchKey(cm, name, e, handle) {
  var seq = cm.state.keySeq
  if (seq) {
    if (isModifierKey(name)) { return "handled" }
    if (/\'$/.test(name))
      { cm.state.keySeq = null }
    else
      { stopSeq.set(50, function () {
        if (cm.state.keySeq == seq) {
          cm.state.keySeq = null
          cm.display.input.reset()
        }
      }) }
    if (dispatchKeyInner(cm, seq + " " + name, e, handle)) { return true }
  }
  return dispatchKeyInner(cm, name, e, handle)
}

function dispatchKeyInner(cm, name, e, handle) {
  var result = lookupKeyForEditor(cm, name, handle)

  if (result == "multi")
    { cm.state.keySeq = name }
  if (result == "handled")
    { signalLater(cm, "keyHandled", cm, name, e) }

  if (result == "handled" || result == "multi") {
    e_preventDefault(e)
    restartBlink(cm)
  }

  return !!result
}

// Handle a key from the keydown event.
function handleKeyBinding(cm, e) {
  var name = keyName(e, true)
  if (!name) { return false }

  if (e.shiftKey && !cm.state.keySeq) {
    // First try to resolve full name (including 'Shift-'). Failing
    // that, see if there is a cursor-motion command (starting with
    // 'go') bound to the keyname without 'Shift-'.
    return dispatchKey(cm, "Shift-" + name, e, function (b) { return doHandleBinding(cm, b, true); })
        || dispatchKey(cm, name, e, function (b) {
             if (typeof b == "string" ? /^go[A-Z]/.test(b) : b.motion)
               { return doHandleBinding(cm, b) }
           })
  } else {
    return dispatchKey(cm, name, e, function (b) { return doHandleBinding(cm, b); })
  }
}

// Handle a key from the keypress event
function handleCharBinding(cm, e, ch) {
  return dispatchKey(cm, "'" + ch + "'", e, function (b) { return doHandleBinding(cm, b, true); })
}

var lastStoppedKey = null
function onKeyDown(e) {
  var cm = this
  cm.curOp.focus = activeElt()
  if (signalDOMEvent(cm, e)) { return }
  // IE does strange things with escape.
  if (ie && ie_version < 11 && e.keyCode == 27) { e.returnValue = false }
  var code = e.keyCode
  cm.display.shift = code == 16 || e.shiftKey
  var handled = handleKeyBinding(cm, e)
  if (presto) {
    lastStoppedKey = handled ? code : null
    // Opera has no cut event... we try to at least catch the key combo
    if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey))
      { cm.replaceSelection("", null, "cut") }
  }

  // Turn mouse into crosshair when Alt is held on Mac.
  if (code == 18 && !/\bCodeMirror-crosshair\b/.test(cm.display.lineDiv.className))
    { showCrossHair(cm) }
}

function showCrossHair(cm) {
  var lineDiv = cm.display.lineDiv
  addClass(lineDiv, "CodeMirror-crosshair")

  function up(e) {
    if (e.keyCode == 18 || !e.altKey) {
      rmClass(lineDiv, "CodeMirror-crosshair")
      off(document, "keyup", up)
      off(document, "mouseover", up)
    }
  }
  on(document, "keyup", up)
  on(document, "mouseover", up)
}

function onKeyUp(e) {
  if (e.keyCode == 16) { this.doc.sel.shift = false }
  signalDOMEvent(this, e)
}

function onKeyPress(e) {
  var cm = this
  if (eventInWidget(cm.display, e) || signalDOMEvent(cm, e) || e.ctrlKey && !e.altKey || mac && e.metaKey) { return }
  var keyCode = e.keyCode, charCode = e.charCode
  if (presto && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return}
  if ((presto && (!e.which || e.which < 10)) && handleKeyBinding(cm, e)) { return }
  var ch = String.fromCharCode(charCode == null ? keyCode : charCode)
  // Some browsers fire keypress events for backspace
  if (ch == "\x08") { return }
  if (handleCharBinding(cm, e, ch)) { return }
  cm.display.input.onKeyPress(e)
}

var DOUBLECLICK_DELAY = 400

var PastClick = function(time, pos, button) {
  this.time = time
  this.pos = pos
  this.button = button
};

PastClick.prototype.compare = function (time, pos, button) {
  return this.time + DOUBLECLICK_DELAY > time &&
    cmp(pos, this.pos) == 0 && button == this.button
};

var lastClick;
var lastDoubleClick;
function clickRepeat(pos, button) {
  var now = +new Date
  if (lastDoubleClick && lastDoubleClick.compare(now, pos, button)) {
    lastClick = lastDoubleClick = null
    return "triple"
  } else if (lastClick && lastClick.compare(now, pos, button)) {
    lastDoubleClick = new PastClick(now, pos, button)
    lastClick = null
    return "double"
  } else {
    lastClick = new PastClick(now, pos, button)
    lastDoubleClick = null
    return "single"
  }
}

// A mouse down can be a single click, double click, triple click,
// start of selection drag, start of text drag, new cursor
// (ctrl-click), rectangle drag (alt-drag), or xwin
// middle-click-paste. Or it might be a click on something we should
// not interfere with, such as a scrollbar or widget.
function onMouseDown(e) {
  var cm = this, display = cm.display
  if (signalDOMEvent(cm, e) || display.activeTouch && display.input.supportsTouch()) { return }
  display.input.ensurePolled()
  display.shift = e.shiftKey

  if (eventInWidget(display, e)) {
    if (!webkit) {
      // Briefly turn off draggability, to allow widgets to do
      // normal dragging things.
      display.scroller.draggable = false
      setTimeout(function () { return display.scroller.draggable = true; }, 100)
    }
    return
  }
  if (clickInGutter(cm, e)) { return }
  var pos = posFromMouse(cm, e), button = e_button(e), repeat = pos ? clickRepeat(pos, button) : "single"
  window.focus()

  // #3261: make sure, that we're not starting a second selection
  if (button == 1 && cm.state.selectingText)
    { cm.state.selectingText(e) }

  if (pos && handleMappedButton(cm, button, pos, repeat, e)) { return }

  if (button == 1) {
    if (pos) { leftButtonDown(cm, pos, repeat, e) }
    else if (e_target(e) == display.scroller) { e_preventDefault(e) }
  } else if (button == 2) {
    if (pos) { extendSelection(cm.doc, pos) }
    setTimeout(function () { return display.input.focus(); }, 20)
  } else if (button == 3) {
    if (captureRightClick) { onContextMenu(cm, e) }
    else { delayBlurEvent(cm) }
  }
}

function handleMappedButton(cm, button, pos, repeat, event) {
  var name = "Click"
  if (repeat == "double") { name = "Double" + name }
  else if (repeat == "triple") { name = "Triple" + name }
  name = (button == 1 ? "Left" : button == 2 ? "Middle" : "Right") + name

  return dispatchKey(cm,  addModifierNames(name, event), event, function (bound) {
    if (typeof bound == "string") { bound = commands[bound] }
    if (!bound) { return false }
    var done = false
    try {
      if (cm.isReadOnly()) { cm.state.suppressEdits = true }
      done = bound(cm, pos) != Pass
    } finally {
      cm.state.suppressEdits = false
    }
    return done
  })
}

function configureMouse(cm, repeat, event) {
  var option = cm.getOption("configureMouse")
  var value = option ? option(cm, repeat, event) : {}
  if (value.unit == null) {
    var rect = chromeOS ? event.shiftKey && event.metaKey : event.altKey
    value.unit = rect ? "rectangle" : repeat == "single" ? "char" : repeat == "double" ? "word" : "line"
  }
  if (value.extend == null || cm.doc.extend) { value.extend = cm.doc.extend || event.shiftKey }
  if (value.addNew == null) { value.addNew = mac ? event.metaKey : event.ctrlKey }
  if (value.moveOnDrag == null) { value.moveOnDrag = !(mac ? event.altKey : event.ctrlKey) }
  return value
}

function leftButtonDown(cm, pos, repeat, event) {
  if (ie) { setTimeout(bind(ensureFocus, cm), 0) }
  else { cm.curOp.focus = activeElt() }

  var behavior = configureMouse(cm, repeat, event)

  var sel = cm.doc.sel, contained
  if (cm.options.dragDrop && dragAndDrop && !cm.isReadOnly() &&
      repeat == "single" && (contained = sel.contains(pos)) > -1 &&
      (cmp((contained = sel.ranges[contained]).from(), pos) < 0 || pos.xRel > 0) &&
      (cmp(contained.to(), pos) > 0 || pos.xRel < 0))
    { leftButtonStartDrag(cm, event, pos, behavior) }
  else
    { leftButtonSelect(cm, event, pos, behavior) }
}

// Start a text drag. When it ends, see if any dragging actually
// happen, and treat as a click if it didn't.
function leftButtonStartDrag(cm, event, pos, behavior) {
  var display = cm.display, moved = false
  var dragEnd = operation(cm, function (e) {
    if (webkit) { display.scroller.draggable = false }
    cm.state.draggingText = false
    off(display.wrapper.ownerDocument, "mouseup", dragEnd)
    off(display.wrapper.ownerDocument, "mousemove", mouseMove)
    off(display.scroller, "dragstart", dragStart)
    off(display.scroller, "drop", dragEnd)
    if (!moved) {
      e_preventDefault(e)
      if (!behavior.addNew)
        { extendSelection(cm.doc, pos, null, null, behavior.extend) }
      // Work around unexplainable focus problem in IE9 (#2127) and Chrome (#3081)
      if (webkit || ie && ie_version == 9)
        { setTimeout(function () {display.wrapper.ownerDocument.body.focus(); display.input.focus()}, 20) }
      else
        { display.input.focus() }
    }
  })
  var mouseMove = function(e2) {
    moved = moved || Math.abs(event.clientX - e2.clientX) + Math.abs(event.clientY - e2.clientY) >= 10
  }
  var dragStart = function () { return moved = true; }
  // Let the drag handler handle this.
  if (webkit) { display.scroller.draggable = true }
  cm.state.draggingText = dragEnd
  dragEnd.copy = !behavior.moveOnDrag
  // IE's approach to draggable
  if (display.scroller.dragDrop) { display.scroller.dragDrop() }
  on(display.wrapper.ownerDocument, "mouseup", dragEnd)
  on(display.wrapper.ownerDocument, "mousemove", mouseMove)
  on(display.scroller, "dragstart", dragStart)
  on(display.scroller, "drop", dragEnd)

  delayBlurEvent(cm)
  setTimeout(function () { return display.input.focus(); }, 20)
}

function rangeForUnit(cm, pos, unit) {
  if (unit == "char") { return new Range(pos, pos) }
  if (unit == "word") { return cm.findWordAt(pos) }
  if (unit == "line") { return new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0))) }
  var result = unit(cm, pos)
  return new Range(result.from, result.to)
}

// Normal selection, as opposed to text dragging.
function leftButtonSelect(cm, event, start, behavior) {
  var display = cm.display, doc = cm.doc
  e_preventDefault(event)

  var ourRange, ourIndex, startSel = doc.sel, ranges = startSel.ranges
  if (behavior.addNew && !behavior.extend) {
    ourIndex = doc.sel.contains(start)
    if (ourIndex > -1)
      { ourRange = ranges[ourIndex] }
    else
      { ourRange = new Range(start, start) }
  } else {
    ourRange = doc.sel.primary()
    ourIndex = doc.sel.primIndex
  }

  if (behavior.unit == "rectangle") {
    if (!behavior.addNew) { ourRange = new Range(start, start) }
    start = posFromMouse(cm, event, true, true)
    ourIndex = -1
  } else {
    var range = rangeForUnit(cm, start, behavior.unit)
    if (behavior.extend)
      { ourRange = extendRange(ourRange, range.anchor, range.head, behavior.extend) }
    else
      { ourRange = range }
  }

  if (!behavior.addNew) {
    ourIndex = 0
    setSelection(doc, new Selection([ourRange], 0), sel_mouse)
    startSel = doc.sel
  } else if (ourIndex == -1) {
    ourIndex = ranges.length
    setSelection(doc, normalizeSelection(ranges.concat([ourRange]), ourIndex),
                 {scroll: false, origin: "*mouse"})
  } else if (ranges.length > 1 && ranges[ourIndex].empty() && behavior.unit == "char" && !behavior.extend) {
    setSelection(doc, normalizeSelection(ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex + 1)), 0),
                 {scroll: false, origin: "*mouse"})
    startSel = doc.sel
  } else {
    replaceOneSelection(doc, ourIndex, ourRange, sel_mouse)
  }

  var lastPos = start
  function extendTo(pos) {
    if (cmp(lastPos, pos) == 0) { return }
    lastPos = pos

    if (behavior.unit == "rectangle") {
      var ranges = [], tabSize = cm.options.tabSize
      var startCol = countColumn(getLine(doc, start.line).text, start.ch, tabSize)
      var posCol = countColumn(getLine(doc, pos.line).text, pos.ch, tabSize)
      var left = Math.min(startCol, posCol), right = Math.max(startCol, posCol)
      for (var line = Math.min(start.line, pos.line), end = Math.min(cm.lastLine(), Math.max(start.line, pos.line));
           line <= end; line++) {
        var text = getLine(doc, line).text, leftPos = findColumn(text, left, tabSize)
        if (left == right)
          { ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos))) }
        else if (text.length > leftPos)
          { ranges.push(new Range(Pos(line, leftPos), Pos(line, findColumn(text, right, tabSize)))) }
      }
      if (!ranges.length) { ranges.push(new Range(start, start)) }
      setSelection(doc, normalizeSelection(startSel.ranges.slice(0, ourIndex).concat(ranges), ourIndex),
                   {origin: "*mouse", scroll: false})
      cm.scrollIntoView(pos)
    } else {
      var oldRange = ourRange
      var range = rangeForUnit(cm, pos, behavior.unit)
      var anchor = oldRange.anchor, head
      if (cmp(range.anchor, anchor) > 0) {
        head = range.head
        anchor = minPos(oldRange.from(), range.anchor)
      } else {
        head = range.anchor
        anchor = maxPos(oldRange.to(), range.head)
      }
      var ranges$1 = startSel.ranges.slice(0)
      ranges$1[ourIndex] = bidiSimplify(cm, new Range(clipPos(doc, anchor), head))
      setSelection(doc, normalizeSelection(ranges$1, ourIndex), sel_mouse)
    }
  }

  var editorSize = display.wrapper.getBoundingClientRect()
  // Used to ensure timeout re-tries don't fire when another extend
  // happened in the meantime (clearTimeout isn't reliable -- at
  // least on Chrome, the timeouts still happen even when cleared,
  // if the clear happens after their scheduled firing time).
  var counter = 0

  function extend(e) {
    var curCount = ++counter
    var cur = posFromMouse(cm, e, true, behavior.unit == "rectangle")
    if (!cur) { return }
    if (cmp(cur, lastPos) != 0) {
      cm.curOp.focus = activeElt()
      extendTo(cur)
      var visible = visibleLines(display, doc)
      if (cur.line >= visible.to || cur.line < visible.from)
        { setTimeout(operation(cm, function () {if (counter == curCount) { extend(e) }}), 150) }
    } else {
      var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0
      if (outside) { setTimeout(operation(cm, function () {
        if (counter != curCount) { return }
        display.scroller.scrollTop += outside
        extend(e)
      }), 50) }
    }
  }

  function done(e) {
    cm.state.selectingText = false
    counter = Infinity
    e_preventDefault(e)
    display.input.focus()
    off(display.wrapper.ownerDocument, "mousemove", move)
    off(display.wrapper.ownerDocument, "mouseup", up)
    doc.history.lastSelOrigin = null
  }

  var move = operation(cm, function (e) {
    if (!e_button(e)) { done(e) }
    else { extend(e) }
  })
  var up = operation(cm, done)
  cm.state.selectingText = up
  on(display.wrapper.ownerDocument, "mousemove", move)
  on(display.wrapper.ownerDocument, "mouseup", up)
}

// Used when mouse-selecting to adjust the anchor to the proper side
// of a bidi jump depending on the visual position of the head.
function bidiSimplify(cm, range) {
  var anchor = range.anchor;
  var head = range.head;
  var anchorLine = getLine(cm.doc, anchor.line)
  if (cmp(anchor, head) == 0 && anchor.sticky == head.sticky) { return range }
  var order = getOrder(anchorLine)
  if (!order) { return range }
  var index = getBidiPartAt(order, anchor.ch, anchor.sticky), part = order[index]
  if (part.from != anchor.ch && part.to != anchor.ch) { return range }
  var boundary = index + ((part.from == anchor.ch) == (part.level != 1) ? 0 : 1)
  if (boundary == 0 || boundary == order.length) { return range }

  // Compute the relative visual position of the head compared to the
  // anchor (<0 is to the left, >0 to the right)
  var leftSide
  if (head.line != anchor.line) {
    leftSide = (head.line - anchor.line) * (cm.doc.direction == "ltr" ? 1 : -1) > 0
  } else {
    var headIndex = getBidiPartAt(order, head.ch, head.sticky)
    var dir = headIndex - index || (head.ch - anchor.ch) * (part.level == 1 ? -1 : 1)
    if (headIndex == boundary - 1 || headIndex == boundary)
      { leftSide = dir < 0 }
    else
      { leftSide = dir > 0 }
  }

  var usePart = order[boundary + (leftSide ? -1 : 0)]
  var from = leftSide == (usePart.level == 1)
  var ch = from ? usePart.from : usePart.to, sticky = from ? "after" : "before"
  return anchor.ch == ch && anchor.sticky == sticky ? range : new Range(new Pos(anchor.line, ch, sticky), head)
}


// Determines whether an event happened in the gutter, and fires the
// handlers for the corresponding event.
function gutterEvent(cm, e, type, prevent) {
  var mX, mY
  if (e.touches) {
    mX = e.touches[0].clientX
    mY = e.touches[0].clientY
  } else {
    try { mX = e.clientX; mY = e.clientY }
    catch(e) { return false }
  }
  if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) { return false }
  if (prevent) { e_preventDefault(e) }

  var display = cm.display
  var lineBox = display.lineDiv.getBoundingClientRect()

  if (mY > lineBox.bottom || !hasHandler(cm, type)) { return e_defaultPrevented(e) }
  mY -= lineBox.top - display.viewOffset

  for (var i = 0; i < cm.options.gutters.length; ++i) {
    var g = display.gutters.childNodes[i]
    if (g && g.getBoundingClientRect().right >= mX) {
      var line = lineAtHeight(cm.doc, mY)
      var gutter = cm.options.gutters[i]
      signal(cm, type, cm, line, gutter, e)
      return e_defaultPrevented(e)
    }
  }
}

function clickInGutter(cm, e) {
  return gutterEvent(cm, e, "gutterClick", true)
}

// CONTEXT MENU HANDLING

// To make the context menu work, we need to briefly unhide the
// textarea (making it as unobtrusive as possible) to let the
// right-click take effect on it.
function onContextMenu(cm, e) {
  if (eventInWidget(cm.display, e) || contextMenuInGutter(cm, e)) { return }
  if (signalDOMEvent(cm, e, "contextmenu")) { return }
  cm.display.input.onContextMenu(e)
}

function contextMenuInGutter(cm, e) {
  if (!hasHandler(cm, "gutterContextMenu")) { return false }
  return gutterEvent(cm, e, "gutterContextMenu", false)
}

function themeChanged(cm) {
  cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-s-\S+/g, "") +
    cm.options.theme.replace(/(^|\s)\s*/g, " cm-s-")
  clearCaches(cm)
}

var Init = {toString: function(){return "CodeMirror.Init"}}

var defaults = {}
var optionHandlers = {}

function defineOptions(CodeMirror) {
  var optionHandlers = CodeMirror.optionHandlers

  function option(name, deflt, handle, notOnInit) {
    CodeMirror.defaults[name] = deflt
    if (handle) { optionHandlers[name] =
      notOnInit ? function (cm, val, old) {if (old != Init) { handle(cm, val, old) }} : handle }
  }

  CodeMirror.defineOption = option

  // Passed to option handlers when there is no old value.
  CodeMirror.Init = Init

  // These two are, on init, called from the constructor because they
  // have to be initialized before the editor can start at all.
  option("value", "", function (cm, val) { return cm.setValue(val); }, true)
  option("mode", null, function (cm, val) {
    cm.doc.modeOption = val
    loadMode(cm)
  }, true)

  option("indentUnit", 2, loadMode, true)
  option("indentWithTabs", false)
  option("smartIndent", true)
  option("tabSize", 4, function (cm) {
    resetModeState(cm)
    clearCaches(cm)
    regChange(cm)
  }, true)

  option("lineSeparator", null, function (cm, val) {
    cm.doc.lineSep = val
    if (!val) { return }
    var newBreaks = [], lineNo = cm.doc.first
    cm.doc.iter(function (line) {
      for (var pos = 0;;) {
        var found = line.text.indexOf(val, pos)
        if (found == -1) { break }
        pos = found + val.length
        newBreaks.push(Pos(lineNo, found))
      }
      lineNo++
    })
    for (var i = newBreaks.length - 1; i >= 0; i--)
      { replaceRange(cm.doc, val, newBreaks[i], Pos(newBreaks[i].line, newBreaks[i].ch + val.length)) }
  })
  option("specialChars", /[\u0000-\u001f\u007f-\u009f\u00ad\u061c\u200b-\u200f\u2028\u2029\ufeff]/g, function (cm, val, old) {
    cm.state.specialChars = new RegExp(val.source + (val.test("\t") ? "" : "|\t"), "g")
    if (old != Init) { cm.refresh() }
  })
  option("specialCharPlaceholder", defaultSpecialCharPlaceholder, function (cm) { return cm.refresh(); }, true)
  option("electricChars", true)
  option("inputStyle", mobile ? "contenteditable" : "textarea", function () {
    throw new Error("inputStyle can not (yet) be changed in a running editor") // FIXME
  }, true)
  option("spellcheck", false, function (cm, val) { return cm.getInputField().spellcheck = val; }, true)
  option("rtlMoveVisually", !windows)
  option("wholeLineUpdateBefore", true)

  option("theme", "default", function (cm) {
    themeChanged(cm)
    guttersChanged(cm)
  }, true)
  option("keyMap", "default", function (cm, val, old) {
    var next = getKeyMap(val)
    var prev = old != Init && getKeyMap(old)
    if (prev && prev.detach) { prev.detach(cm, next) }
    if (next.attach) { next.attach(cm, prev || null) }
  })
  option("extraKeys", null)
  option("configureMouse", null)

  option("lineWrapping", false, wrappingChanged, true)
  option("gutters", [], function (cm) {
    setGuttersForLineNumbers(cm.options)
    guttersChanged(cm)
  }, true)
  option("fixedGutter", true, function (cm, val) {
    cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + "px" : "0"
    cm.refresh()
  }, true)
  option("coverGutterNextToScrollbar", false, function (cm) { return updateScrollbars(cm); }, true)
  option("scrollbarStyle", "native", function (cm) {
    initScrollbars(cm)
    updateScrollbars(cm)
    cm.display.scrollbars.setScrollTop(cm.doc.scrollTop)
    cm.display.scrollbars.setScrollLeft(cm.doc.scrollLeft)
  }, true)
  option("lineNumbers", false, function (cm) {
    setGuttersForLineNumbers(cm.options)
    guttersChanged(cm)
  }, true)
  option("firstLineNumber", 1, guttersChanged, true)
  option("lineNumberFormatter", function (integer) { return integer; }, guttersChanged, true)
  option("showCursorWhenSelecting", false, updateSelection, true)

  option("resetSelectionOnContextMenu", true)
  option("lineWiseCopyCut", true)
  option("pasteLinesPerSelection", true)

  option("readOnly", false, function (cm, val) {
    if (val == "nocursor") {
      onBlur(cm)
      cm.display.input.blur()
    }
    cm.display.input.readOnlyChanged(val)
  })
  option("disableInput", false, function (cm, val) {if (!val) { cm.display.input.reset() }}, true)
  option("dragDrop", true, dragDropChanged)
  option("allowDropFileTypes", null)

  option("cursorBlinkRate", 530)
  option("cursorScrollMargin", 0)
  option("cursorHeight", 1, updateSelection, true)
  option("singleCursorHeightPerLine", true, updateSelection, true)
  option("workTime", 100)
  option("workDelay", 100)
  option("flattenSpans", true, resetModeState, true)
  option("addModeClass", false, resetModeState, true)
  option("pollInterval", 100)
  option("undoDepth", 200, function (cm, val) { return cm.doc.history.undoDepth = val; })
  option("historyEventDelay", 1250)
  option("viewportMargin", 10, function (cm) { return cm.refresh(); }, true)
  option("maxHighlightLength", 10000, resetModeState, true)
  option("moveInputWithCursor", true, function (cm, val) {
    if (!val) { cm.display.input.resetPosition() }
  })

  option("tabindex", null, function (cm, val) { return cm.display.input.getField().tabIndex = val || ""; })
  option("autofocus", null)
  option("direction", "ltr", function (cm, val) { return cm.doc.setDirection(val); }, true)
}

function guttersChanged(cm) {
  updateGutters(cm)
  regChange(cm)
  alignHorizontally(cm)
}

function dragDropChanged(cm, value, old) {
  var wasOn = old && old != Init
  if (!value != !wasOn) {
    var funcs = cm.display.dragFunctions
    var toggle = value ? on : off
    toggle(cm.display.scroller, "dragstart", funcs.start)
    toggle(cm.display.scroller, "dragenter", funcs.enter)
    toggle(cm.display.scroller, "dragover", funcs.over)
    toggle(cm.display.scroller, "dragleave", funcs.leave)
    toggle(cm.display.scroller, "drop", funcs.drop)
  }
}

function wrappingChanged(cm) {
  if (cm.options.lineWrapping) {
    addClass(cm.display.wrapper, "CodeMirror-wrap")
    cm.display.sizer.style.minWidth = ""
    cm.display.sizerWidth = null
  } else {
    rmClass(cm.display.wrapper, "CodeMirror-wrap")
    findMaxLine(cm)
  }
  estimateLineHeights(cm)
  regChange(cm)
  clearCaches(cm)
  setTimeout(function () { return updateScrollbars(cm); }, 100)
}

// A CodeMirror instance represents an editor. This is the object
// that user code is usually dealing with.

function CodeMirror(place, options) {
  var this$1 = this;

  if (!(this instanceof CodeMirror)) { return new CodeMirror(place, options) }

  this.options = options = options ? copyObj(options) : {}
  // Determine effective options based on given values and defaults.
  copyObj(defaults, options, false)
  setGuttersForLineNumbers(options)

  var doc = options.value
  if (typeof doc == "string") { doc = new Doc(doc, options.mode, null, options.lineSeparator, options.direction) }
  this.doc = doc

  var input = new CodeMirror.inputStyles[options.inputStyle](this)
  var display = this.display = new Display(place, doc, input)
  display.wrapper.CodeMirror = this
  updateGutters(this)
  themeChanged(this)
  if (options.lineWrapping)
    { this.display.wrapper.className += " CodeMirror-wrap" }
  initScrollbars(this)

  this.state = {
    keyMaps: [],  // stores maps added by addKeyMap
    overlays: [], // highlighting overlays, as added by addOverlay
    modeGen: 0,   // bumped when mode/overlay changes, used to invalidate highlighting info
    overwrite: false,
    delayingBlurEvent: false,
    focused: false,
    suppressEdits: false, // used to disable editing during key handlers when in readOnly mode
    pasteIncoming: false, cutIncoming: false, // help recognize paste/cut edits in input.poll
    selectingText: false,
    draggingText: false,
    highlight: new Delayed(), // stores highlight worker timeout
    keySeq: null,  // Unfinished key sequence
    specialChars: null
  }

  if (options.autofocus && !mobile) { display.input.focus() }

  // Override magic textarea content restore that IE sometimes does
  // on our hidden textarea on reload
  if (ie && ie_version < 11) { setTimeout(function () { return this$1.display.input.reset(true); }, 20) }

  registerEventHandlers(this)
  ensureGlobalHandlers()

  startOperation(this)
  this.curOp.forceUpdate = true
  attachDoc(this, doc)

  if ((options.autofocus && !mobile) || this.hasFocus())
    { setTimeout(bind(onFocus, this), 20) }
  else
    { onBlur(this) }

  for (var opt in optionHandlers) { if (optionHandlers.hasOwnProperty(opt))
    { optionHandlers[opt](this$1, options[opt], Init) } }
  maybeUpdateLineNumberWidth(this)
  if (options.finishInit) { options.finishInit(this) }
  for (var i = 0; i < initHooks.length; ++i) { initHooks[i](this$1) }
  endOperation(this)
  // Suppress optimizelegibility in Webkit, since it breaks text
  // measuring on line wrapping boundaries.
  if (webkit && options.lineWrapping &&
      getComputedStyle(display.lineDiv).textRendering == "optimizelegibility")
    { display.lineDiv.style.textRendering = "auto" }
}

// The default configuration options.
CodeMirror.defaults = defaults
// Functions to run when options are changed.
CodeMirror.optionHandlers = optionHandlers

// Attach the necessary event handlers when initializing the editor
function registerEventHandlers(cm) {
  var d = cm.display
  on(d.scroller, "mousedown", operation(cm, onMouseDown))
  // Older IE's will not fire a second mousedown for a double click
  if (ie && ie_version < 11)
    { on(d.scroller, "dblclick", operation(cm, function (e) {
      if (signalDOMEvent(cm, e)) { return }
      var pos = posFromMouse(cm, e)
      if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) { return }
      e_preventDefault(e)
      var word = cm.findWordAt(pos)
      extendSelection(cm.doc, word.anchor, word.head)
    })) }
  else
    { on(d.scroller, "dblclick", function (e) { return signalDOMEvent(cm, e) || e_preventDefault(e); }) }
  // Some browsers fire contextmenu *after* opening the menu, at
  // which point we can't mess with it anymore. Context menu is
  // handled in onMouseDown for these browsers.
  if (!captureRightClick) { on(d.scroller, "contextmenu", function (e) { return onContextMenu(cm, e); }) }

  // Used to suppress mouse event handling when a touch happens
  var touchFinished, prevTouch = {end: 0}
  function finishTouch() {
    if (d.activeTouch) {
      touchFinished = setTimeout(function () { return d.activeTouch = null; }, 1000)
      prevTouch = d.activeTouch
      prevTouch.end = +new Date
    }
  }
  function isMouseLikeTouchEvent(e) {
    if (e.touches.length != 1) { return false }
    var touch = e.touches[0]
    return touch.radiusX <= 1 && touch.radiusY <= 1
  }
  function farAway(touch, other) {
    if (other.left == null) { return true }
    var dx = other.left - touch.left, dy = other.top - touch.top
    return dx * dx + dy * dy > 20 * 20
  }
  on(d.scroller, "touchstart", function (e) {
    if (!signalDOMEvent(cm, e) && !isMouseLikeTouchEvent(e) && !clickInGutter(cm, e)) {
      d.input.ensurePolled()
      clearTimeout(touchFinished)
      var now = +new Date
      d.activeTouch = {start: now, moved: false,
                       prev: now - prevTouch.end <= 300 ? prevTouch : null}
      if (e.touches.length == 1) {
        d.activeTouch.left = e.touches[0].pageX
        d.activeTouch.top = e.touches[0].pageY
      }
    }
  })
  on(d.scroller, "touchmove", function () {
    if (d.activeTouch) { d.activeTouch.moved = true }
  })
  on(d.scroller, "touchend", function (e) {
    var touch = d.activeTouch
    if (touch && !eventInWidget(d, e) && touch.left != null &&
        !touch.moved && new Date - touch.start < 300) {
      var pos = cm.coordsChar(d.activeTouch, "page"), range
      if (!touch.prev || farAway(touch, touch.prev)) // Single tap
        { range = new Range(pos, pos) }
      else if (!touch.prev.prev || farAway(touch, touch.prev.prev)) // Double tap
        { range = cm.findWordAt(pos) }
      else // Triple tap
        { range = new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0))) }
      cm.setSelection(range.anchor, range.head)
      cm.focus()
      e_preventDefault(e)
    }
    finishTouch()
  })
  on(d.scroller, "touchcancel", finishTouch)

  // Sync scrolling between fake scrollbars and real scrollable
  // area, ensure viewport is updated when scrolling.
  on(d.scroller, "scroll", function () {
    if (d.scroller.clientHeight) {
      updateScrollTop(cm, d.scroller.scrollTop)
      setScrollLeft(cm, d.scroller.scrollLeft, true)
      signal(cm, "scroll", cm)
    }
  })

  // Listen to wheel events in order to try and update the viewport on time.
  on(d.scroller, "mousewheel", function (e) { return onScrollWheel(cm, e); })
  on(d.scroller, "DOMMouseScroll", function (e) { return onScrollWheel(cm, e); })

  // Prevent wrapper from ever scrolling
  on(d.wrapper, "scroll", function () { return d.wrapper.scrollTop = d.wrapper.scrollLeft = 0; })

  d.dragFunctions = {
    enter: function (e) {if (!signalDOMEvent(cm, e)) { e_stop(e) }},
    over: function (e) {if (!signalDOMEvent(cm, e)) { onDragOver(cm, e); e_stop(e) }},
    start: function (e) { return onDragStart(cm, e); },
    drop: operation(cm, onDrop),
    leave: function (e) {if (!signalDOMEvent(cm, e)) { clearDragCursor(cm) }}
  }

  var inp = d.input.getField()
  on(inp, "keyup", function (e) { return onKeyUp.call(cm, e); })
  on(inp, "keydown", operation(cm, onKeyDown))
  on(inp, "keypress", operation(cm, onKeyPress))
  on(inp, "focus", function (e) { return onFocus(cm, e); })
  on(inp, "blur", function (e) { return onBlur(cm, e); })
}

var initHooks = []
CodeMirror.defineInitHook = function (f) { return initHooks.push(f); }

// Indent the given line. The how parameter can be "smart",
// "add"/null, "subtract", or "prev". When aggressive is false
// (typically set to true for forced single-line indents), empty
// lines are not indented, and places where the mode returns Pass
// are left alone.
function indentLine(cm, n, how, aggressive) {
  var doc = cm.doc, state
  if (how == null) { how = "add" }
  if (how == "smart") {
    // Fall back to "prev" when the mode doesn't have an indentation
    // method.
    if (!doc.mode.indent) { how = "prev" }
    else { state = getContextBefore(cm, n).state }
  }

  var tabSize = cm.options.tabSize
  var line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize)
  if (line.stateAfter) { line.stateAfter = null }
  var curSpaceString = line.text.match(/^\s*/)[0], indentation
  if (!aggressive && !/\S/.test(line.text)) {
    indentation = 0
    how = "not"
  } else if (how == "smart") {
    indentation = doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text)
    if (indentation == Pass || indentation > 150) {
      if (!aggressive) { return }
      how = "prev"
    }
  }
  if (how == "prev") {
    if (n > doc.first) { indentation = countColumn(getLine(doc, n-1).text, null, tabSize) }
    else { indentation = 0 }
  } else if (how == "add") {
    indentation = curSpace + cm.options.indentUnit
  } else if (how == "subtract") {
    indentation = curSpace - cm.options.indentUnit
  } else if (typeof how == "number") {
    indentation = curSpace + how
  }
  indentation = Math.max(0, indentation)

  var indentString = "", pos = 0
  if (cm.options.indentWithTabs)
    { for (var i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += "\t"} }
  if (pos < indentation) { indentString += spaceStr(indentation - pos) }

  if (indentString != curSpaceString) {
    replaceRange(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input")
    line.stateAfter = null
    return true
  } else {
    // Ensure that, if the cursor was in the whitespace at the start
    // of the line, it is moved to the end of that space.
    for (var i$1 = 0; i$1 < doc.sel.ranges.length; i$1++) {
      var range = doc.sel.ranges[i$1]
      if (range.head.line == n && range.head.ch < curSpaceString.length) {
        var pos$1 = Pos(n, curSpaceString.length)
        replaceOneSelection(doc, i$1, new Range(pos$1, pos$1))
        break
      }
    }
  }
}

// This will be set to a {lineWise: bool, text: [string]} object, so
// that, when pasting, we know what kind of selections the copied
// text was made out of.
var lastCopied = null

function setLastCopied(newLastCopied) {
  lastCopied = newLastCopied
}

function applyTextInput(cm, inserted, deleted, sel, origin) {
  var doc = cm.doc
  cm.display.shift = false
  if (!sel) { sel = doc.sel }

  var paste = cm.state.pasteIncoming || origin == "paste"
  var textLines = splitLinesAuto(inserted), multiPaste = null
  // When pasting N lines into N selections, insert one line per selection
  if (paste && sel.ranges.length > 1) {
    if (lastCopied && lastCopied.text.join("\n") == inserted) {
      if (sel.ranges.length % lastCopied.text.length == 0) {
        multiPaste = []
        for (var i = 0; i < lastCopied.text.length; i++)
          { multiPaste.push(doc.splitLines(lastCopied.text[i])) }
      }
    } else if (textLines.length == sel.ranges.length && cm.options.pasteLinesPerSelection) {
      multiPaste = map(textLines, function (l) { return [l]; })
    }
  }

  var updateInput
  // Normal behavior is to insert the new text into every selection
  for (var i$1 = sel.ranges.length - 1; i$1 >= 0; i$1--) {
    var range = sel.ranges[i$1]
    var from = range.from(), to = range.to()
    if (range.empty()) {
      if (deleted && deleted > 0) // Handle deletion
        { from = Pos(from.line, from.ch - deleted) }
      else if (cm.state.overwrite && !paste) // Handle overwrite
        { to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length)) }
      else if (lastCopied && lastCopied.lineWise && lastCopied.text.join("\n") == inserted)
        { from = to = Pos(from.line, 0) }
    }
    updateInput = cm.curOp.updateInput
    var changeEvent = {from: from, to: to, text: multiPaste ? multiPaste[i$1 % multiPaste.length] : textLines,
                       origin: origin || (paste ? "paste" : cm.state.cutIncoming ? "cut" : "+input")}
    makeChange(cm.doc, changeEvent)
    signalLater(cm, "inputRead", cm, changeEvent)
  }
  if (inserted && !paste)
    { triggerElectric(cm, inserted) }

  ensureCursorVisible(cm)
  cm.curOp.updateInput = updateInput
  cm.curOp.typing = true
  cm.state.pasteIncoming = cm.state.cutIncoming = false
}

function handlePaste(e, cm) {
  var pasted = e.clipboardData && e.clipboardData.getData("Text")
  if (pasted) {
    e.preventDefault()
    if (!cm.isReadOnly() && !cm.options.disableInput)
      { runInOp(cm, function () { return applyTextInput(cm, pasted, 0, null, "paste"); }) }
    return true
  }
}

function triggerElectric(cm, inserted) {
  // When an 'electric' character is inserted, immediately trigger a reindent
  if (!cm.options.electricChars || !cm.options.smartIndent) { return }
  var sel = cm.doc.sel

  for (var i = sel.ranges.length - 1; i >= 0; i--) {
    var range = sel.ranges[i]
    if (range.head.ch > 100 || (i && sel.ranges[i - 1].head.line == range.head.line)) { continue }
    var mode = cm.getModeAt(range.head)
    var indented = false
    if (mode.electricChars) {
      for (var j = 0; j < mode.electricChars.length; j++)
        { if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {
          indented = indentLine(cm, range.head.line, "smart")
          break
        } }
    } else if (mode.electricInput) {
      if (mode.electricInput.test(getLine(cm.doc, range.head.line).text.slice(0, range.head.ch)))
        { indented = indentLine(cm, range.head.line, "smart") }
    }
    if (indented) { signalLater(cm, "electricInput", cm, range.head.line) }
  }
}

function copyableRanges(cm) {
  var text = [], ranges = []
  for (var i = 0; i < cm.doc.sel.ranges.length; i++) {
    var line = cm.doc.sel.ranges[i].head.line
    var lineRange = {anchor: Pos(line, 0), head: Pos(line + 1, 0)}
    ranges.push(lineRange)
    text.push(cm.getRange(lineRange.anchor, lineRange.head))
  }
  return {text: text, ranges: ranges}
}

function disableBrowserMagic(field, spellcheck) {
  field.setAttribute("autocorrect", "off")
  field.setAttribute("autocapitalize", "off")
  field.setAttribute("spellcheck", !!spellcheck)
}

function hiddenTextarea() {
  var te = elt("textarea", null, null, "position: absolute; bottom: -1em; padding: 0; width: 1px; height: 1em; outline: none")
  var div = elt("div", [te], null, "overflow: hidden; position: relative; width: 3px; height: 0px;")
  // The textarea is kept positioned near the cursor to prevent the
  // fact that it'll be scrolled into view on input from scrolling
  // our fake cursor out of view. On webkit, when wrap=off, paste is
  // very slow. So make the area wide instead.
  if (webkit) { te.style.width = "1000px" }
  else { te.setAttribute("wrap", "off") }
  // If border: 0; -- iOS fails to open keyboard (issue #1287)
  if (ios) { te.style.border = "1px solid black" }
  disableBrowserMagic(te)
  return div
}

// The publicly visible API. Note that methodOp(f) means
// 'wrap f in an operation, performed on its `this` parameter'.

// This is not the complete set of editor methods. Most of the
// methods defined on the Doc type are also injected into
// CodeMirror.prototype, for backwards compatibility and
// convenience.

function addEditorMethods(CodeMirror) {
  var optionHandlers = CodeMirror.optionHandlers

  var helpers = CodeMirror.helpers = {}

  CodeMirror.prototype = {
    constructor: CodeMirror,
    focus: function(){window.focus(); this.display.input.focus()},

    setOption: function(option, value) {
      var options = this.options, old = options[option]
      if (options[option] == value && option != "mode") { return }
      options[option] = value
      if (optionHandlers.hasOwnProperty(option))
        { operation(this, optionHandlers[option])(this, value, old) }
      signal(this, "optionChange", this, option)
    },

    getOption: function(option) {return this.options[option]},
    getDoc: function() {return this.doc},

    addKeyMap: function(map, bottom) {
      this.state.keyMaps[bottom ? "push" : "unshift"](getKeyMap(map))
    },
    removeKeyMap: function(map) {
      var maps = this.state.keyMaps
      for (var i = 0; i < maps.length; ++i)
        { if (maps[i] == map || maps[i].name == map) {
          maps.splice(i, 1)
          return true
        } }
    },

    addOverlay: methodOp(function(spec, options) {
      var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec)
      if (mode.startState) { throw new Error("Overlays may not be stateful.") }
      insertSorted(this.state.overlays,
                   {mode: mode, modeSpec: spec, opaque: options && options.opaque,
                    priority: (options && options.priority) || 0},
                   function (overlay) { return overlay.priority; })
      this.state.modeGen++
      regChange(this)
    }),
    removeOverlay: methodOp(function(spec) {
      var this$1 = this;

      var overlays = this.state.overlays
      for (var i = 0; i < overlays.length; ++i) {
        var cur = overlays[i].modeSpec
        if (cur == spec || typeof spec == "string" && cur.name == spec) {
          overlays.splice(i, 1)
          this$1.state.modeGen++
          regChange(this$1)
          return
        }
      }
    }),

    indentLine: methodOp(function(n, dir, aggressive) {
      if (typeof dir != "string" && typeof dir != "number") {
        if (dir == null) { dir = this.options.smartIndent ? "smart" : "prev" }
        else { dir = dir ? "add" : "subtract" }
      }
      if (isLine(this.doc, n)) { indentLine(this, n, dir, aggressive) }
    }),
    indentSelection: methodOp(function(how) {
      var this$1 = this;

      var ranges = this.doc.sel.ranges, end = -1
      for (var i = 0; i < ranges.length; i++) {
        var range = ranges[i]
        if (!range.empty()) {
          var from = range.from(), to = range.to()
          var start = Math.max(end, from.line)
          end = Math.min(this$1.lastLine(), to.line - (to.ch ? 0 : 1)) + 1
          for (var j = start; j < end; ++j)
            { indentLine(this$1, j, how) }
          var newRanges = this$1.doc.sel.ranges
          if (from.ch == 0 && ranges.length == newRanges.length && newRanges[i].from().ch > 0)
            { replaceOneSelection(this$1.doc, i, new Range(from, newRanges[i].to()), sel_dontScroll) }
        } else if (range.head.line > end) {
          indentLine(this$1, range.head.line, how, true)
          end = range.head.line
          if (i == this$1.doc.sel.primIndex) { ensureCursorVisible(this$1) }
        }
      }
    }),

    // Fetch the parser token for a given character. Useful for hacks
    // that want to inspect the mode state (say, for completion).
    getTokenAt: function(pos, precise) {
      return takeToken(this, pos, precise)
    },

    getLineTokens: function(line, precise) {
      return takeToken(this, Pos(line), precise, true)
    },

    getTokenTypeAt: function(pos) {
      pos = clipPos(this.doc, pos)
      var styles = getLineStyles(this, getLine(this.doc, pos.line))
      var before = 0, after = (styles.length - 1) / 2, ch = pos.ch
      var type
      if (ch == 0) { type = styles[2] }
      else { for (;;) {
        var mid = (before + after) >> 1
        if ((mid ? styles[mid * 2 - 1] : 0) >= ch) { after = mid }
        else if (styles[mid * 2 + 1] < ch) { before = mid + 1 }
        else { type = styles[mid * 2 + 2]; break }
      } }
      var cut = type ? type.indexOf("overlay ") : -1
      return cut < 0 ? type : cut == 0 ? null : type.slice(0, cut - 1)
    },

    getModeAt: function(pos) {
      var mode = this.doc.mode
      if (!mode.innerMode) { return mode }
      return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode
    },

    getHelper: function(pos, type) {
      return this.getHelpers(pos, type)[0]
    },

    getHelpers: function(pos, type) {
      var this$1 = this;

      var found = []
      if (!helpers.hasOwnProperty(type)) { return found }
      var help = helpers[type], mode = this.getModeAt(pos)
      if (typeof mode[type] == "string") {
        if (help[mode[type]]) { found.push(help[mode[type]]) }
      } else if (mode[type]) {
        for (var i = 0; i < mode[type].length; i++) {
          var val = help[mode[type][i]]
          if (val) { found.push(val) }
        }
      } else if (mode.helperType && help[mode.helperType]) {
        found.push(help[mode.helperType])
      } else if (help[mode.name]) {
        found.push(help[mode.name])
      }
      for (var i$1 = 0; i$1 < help._global.length; i$1++) {
        var cur = help._global[i$1]
        if (cur.pred(mode, this$1) && indexOf(found, cur.val) == -1)
          { found.push(cur.val) }
      }
      return found
    },

    getStateAfter: function(line, precise) {
      var doc = this.doc
      line = clipLine(doc, line == null ? doc.first + doc.size - 1: line)
      return getContextBefore(this, line + 1, precise).state
    },

    cursorCoords: function(start, mode) {
      var pos, range = this.doc.sel.primary()
      if (start == null) { pos = range.head }
      else if (typeof start == "object") { pos = clipPos(this.doc, start) }
      else { pos = start ? range.from() : range.to() }
      return cursorCoords(this, pos, mode || "page")
    },

    charCoords: function(pos, mode) {
      return charCoords(this, clipPos(this.doc, pos), mode || "page")
    },

    coordsChar: function(coords, mode) {
      coords = fromCoordSystem(this, coords, mode || "page")
      return coordsChar(this, coords.left, coords.top)
    },

    lineAtHeight: function(height, mode) {
      height = fromCoordSystem(this, {top: height, left: 0}, mode || "page").top
      return lineAtHeight(this.doc, height + this.display.viewOffset)
    },
    heightAtLine: function(line, mode, includeWidgets) {
      var end = false, lineObj
      if (typeof line == "number") {
        var last = this.doc.first + this.doc.size - 1
        if (line < this.doc.first) { line = this.doc.first }
        else if (line > last) { line = last; end = true }
        lineObj = getLine(this.doc, line)
      } else {
        lineObj = line
      }
      return intoCoordSystem(this, lineObj, {top: 0, left: 0}, mode || "page", includeWidgets || end).top +
        (end ? this.doc.height - heightAtLine(lineObj) : 0)
    },

    defaultTextHeight: function() { return textHeight(this.display) },
    defaultCharWidth: function() { return charWidth(this.display) },

    getViewport: function() { return {from: this.display.viewFrom, to: this.display.viewTo}},

    addWidget: function(pos, node, scroll, vert, horiz) {
      var display = this.display
      pos = cursorCoords(this, clipPos(this.doc, pos))
      var top = pos.bottom, left = pos.left
      node.style.position = "absolute"
      node.setAttribute("cm-ignore-events", "true")
      this.display.input.setUneditable(node)
      display.sizer.appendChild(node)
      if (vert == "over") {
        top = pos.top
      } else if (vert == "above" || vert == "near") {
        var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),
        hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth)
        // Default to positioning above (if specified and possible); otherwise default to positioning below
        if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight)
          { top = pos.top - node.offsetHeight }
        else if (pos.bottom + node.offsetHeight <= vspace)
          { top = pos.bottom }
        if (left + node.offsetWidth > hspace)
          { left = hspace - node.offsetWidth }
      }
      node.style.top = top + "px"
      node.style.left = node.style.right = ""
      if (horiz == "right") {
        left = display.sizer.clientWidth - node.offsetWidth
        node.style.right = "0px"
      } else {
        if (horiz == "left") { left = 0 }
        else if (horiz == "middle") { left = (display.sizer.clientWidth - node.offsetWidth) / 2 }
        node.style.left = left + "px"
      }
      if (scroll)
        { scrollIntoView(this, {left: left, top: top, right: left + node.offsetWidth, bottom: top + node.offsetHeight}) }
    },

    triggerOnKeyDown: methodOp(onKeyDown),
    triggerOnKeyPress: methodOp(onKeyPress),
    triggerOnKeyUp: onKeyUp,
    triggerOnMouseDown: methodOp(onMouseDown),

    execCommand: function(cmd) {
      if (commands.hasOwnProperty(cmd))
        { return commands[cmd].call(null, this) }
    },

    triggerElectric: methodOp(function(text) { triggerElectric(this, text) }),

    findPosH: function(from, amount, unit, visually) {
      var this$1 = this;

      var dir = 1
      if (amount < 0) { dir = -1; amount = -amount }
      var cur = clipPos(this.doc, from)
      for (var i = 0; i < amount; ++i) {
        cur = findPosH(this$1.doc, cur, dir, unit, visually)
        if (cur.hitSide) { break }
      }
      return cur
    },

    moveH: methodOp(function(dir, unit) {
      var this$1 = this;

      this.extendSelectionsBy(function (range) {
        if (this$1.display.shift || this$1.doc.extend || range.empty())
          { return findPosH(this$1.doc, range.head, dir, unit, this$1.options.rtlMoveVisually) }
        else
          { return dir < 0 ? range.from() : range.to() }
      }, sel_move)
    }),

    deleteH: methodOp(function(dir, unit) {
      var sel = this.doc.sel, doc = this.doc
      if (sel.somethingSelected())
        { doc.replaceSelection("", null, "+delete") }
      else
        { deleteNearSelection(this, function (range) {
          var other = findPosH(doc, range.head, dir, unit, false)
          return dir < 0 ? {from: other, to: range.head} : {from: range.head, to: other}
        }) }
    }),

    findPosV: function(from, amount, unit, goalColumn) {
      var this$1 = this;

      var dir = 1, x = goalColumn
      if (amount < 0) { dir = -1; amount = -amount }
      var cur = clipPos(this.doc, from)
      for (var i = 0; i < amount; ++i) {
        var coords = cursorCoords(this$1, cur, "div")
        if (x == null) { x = coords.left }
        else { coords.left = x }
        cur = findPosV(this$1, coords, dir, unit)
        if (cur.hitSide) { break }
      }
      return cur
    },

    moveV: methodOp(function(dir, unit) {
      var this$1 = this;

      var doc = this.doc, goals = []
      var collapse = !this.display.shift && !doc.extend && doc.sel.somethingSelected()
      doc.extendSelectionsBy(function (range) {
        if (collapse)
          { return dir < 0 ? range.from() : range.to() }
        var headPos = cursorCoords(this$1, range.head, "div")
        if (range.goalColumn != null) { headPos.left = range.goalColumn }
        goals.push(headPos.left)
        var pos = findPosV(this$1, headPos, dir, unit)
        if (unit == "page" && range == doc.sel.primary())
          { addToScrollTop(this$1, charCoords(this$1, pos, "div").top - headPos.top) }
        return pos
      }, sel_move)
      if (goals.length) { for (var i = 0; i < doc.sel.ranges.length; i++)
        { doc.sel.ranges[i].goalColumn = goals[i] } }
    }),

    // Find the word at the given position (as returned by coordsChar).
    findWordAt: function(pos) {
      var doc = this.doc, line = getLine(doc, pos.line).text
      var start = pos.ch, end = pos.ch
      if (line) {
        var helper = this.getHelper(pos, "wordChars")
        if ((pos.sticky == "before" || end == line.length) && start) { --start; } else { ++end }
        var startChar = line.charAt(start)
        var check = isWordChar(startChar, helper)
          ? function (ch) { return isWordChar(ch, helper); }
          : /\s/.test(startChar) ? function (ch) { return /\s/.test(ch); }
          : function (ch) { return (!/\s/.test(ch) && !isWordChar(ch)); }
        while (start > 0 && check(line.charAt(start - 1))) { --start }
        while (end < line.length && check(line.charAt(end))) { ++end }
      }
      return new Range(Pos(pos.line, start), Pos(pos.line, end))
    },

    toggleOverwrite: function(value) {
      if (value != null && value == this.state.overwrite) { return }
      if (this.state.overwrite = !this.state.overwrite)
        { addClass(this.display.cursorDiv, "CodeMirror-overwrite") }
      else
        { rmClass(this.display.cursorDiv, "CodeMirror-overwrite") }

      signal(this, "overwriteToggle", this, this.state.overwrite)
    },
    hasFocus: function() { return this.display.input.getField() == activeElt() },
    isReadOnly: function() { return !!(this.options.readOnly || this.doc.cantEdit) },

    scrollTo: methodOp(function (x, y) { scrollToCoords(this, x, y) }),
    getScrollInfo: function() {
      var scroller = this.display.scroller
      return {left: scroller.scrollLeft, top: scroller.scrollTop,
              height: scroller.scrollHeight - scrollGap(this) - this.display.barHeight,
              width: scroller.scrollWidth - scrollGap(this) - this.display.barWidth,
              clientHeight: displayHeight(this), clientWidth: displayWidth(this)}
    },

    scrollIntoView: methodOp(function(range, margin) {
      if (range == null) {
        range = {from: this.doc.sel.primary().head, to: null}
        if (margin == null) { margin = this.options.cursorScrollMargin }
      } else if (typeof range == "number") {
        range = {from: Pos(range, 0), to: null}
      } else if (range.from == null) {
        range = {from: range, to: null}
      }
      if (!range.to) { range.to = range.from }
      range.margin = margin || 0

      if (range.from.line != null) {
        scrollToRange(this, range)
      } else {
        scrollToCoordsRange(this, range.from, range.to, range.margin)
      }
    }),

    setSize: methodOp(function(width, height) {
      var this$1 = this;

      var interpret = function (val) { return typeof val == "number" || /^\d+$/.test(String(val)) ? val + "px" : val; }
      if (width != null) { this.display.wrapper.style.width = interpret(width) }
      if (height != null) { this.display.wrapper.style.height = interpret(height) }
      if (this.options.lineWrapping) { clearLineMeasurementCache(this) }
      var lineNo = this.display.viewFrom
      this.doc.iter(lineNo, this.display.viewTo, function (line) {
        if (line.widgets) { for (var i = 0; i < line.widgets.length; i++)
          { if (line.widgets[i].noHScroll) { regLineChange(this$1, lineNo, "widget"); break } } }
        ++lineNo
      })
      this.curOp.forceUpdate = true
      signal(this, "refresh", this)
    }),

    operation: function(f){return runInOp(this, f)},
    startOperation: function(){return startOperation(this)},
    endOperation: function(){return endOperation(this)},

    refresh: methodOp(function() {
      var oldHeight = this.display.cachedTextHeight
      regChange(this)
      this.curOp.forceUpdate = true
      clearCaches(this)
      scrollToCoords(this, this.doc.scrollLeft, this.doc.scrollTop)
      updateGutterSpace(this)
      if (oldHeight == null || Math.abs(oldHeight - textHeight(this.display)) > .5)
        { estimateLineHeights(this) }
      signal(this, "refresh", this)
    }),

    swapDoc: methodOp(function(doc) {
      var old = this.doc
      old.cm = null
      attachDoc(this, doc)
      clearCaches(this)
      this.display.input.reset()
      scrollToCoords(this, doc.scrollLeft, doc.scrollTop)
      this.curOp.forceScroll = true
      signalLater(this, "swapDoc", this, old)
      return old
    }),

    getInputField: function(){return this.display.input.getField()},
    getWrapperElement: function(){return this.display.wrapper},
    getScrollerElement: function(){return this.display.scroller},
    getGutterElement: function(){return this.display.gutters}
  }
  eventMixin(CodeMirror)

  CodeMirror.registerHelper = function(type, name, value) {
    if (!helpers.hasOwnProperty(type)) { helpers[type] = CodeMirror[type] = {_global: []} }
    helpers[type][name] = value
  }
  CodeMirror.registerGlobalHelper = function(type, name, predicate, value) {
    CodeMirror.registerHelper(type, name, value)
    helpers[type]._global.push({pred: predicate, val: value})
  }
}

// Used for horizontal relative motion. Dir is -1 or 1 (left or
// right), unit can be "char", "column" (like char, but doesn't
// cross line boundaries), "word" (across next word), or "group" (to
// the start of next group of word or non-word-non-whitespace
// chars). The visually param controls whether, in right-to-left
// text, direction 1 means to move towards the next index in the
// string, or towards the character to the right of the current
// position. The resulting position will have a hitSide=true
// property if it reached the end of the document.
function findPosH(doc, pos, dir, unit, visually) {
  var oldPos = pos
  var origDir = dir
  var lineObj = getLine(doc, pos.line)
  function findNextLine() {
    var l = pos.line + dir
    if (l < doc.first || l >= doc.first + doc.size) { return false }
    pos = new Pos(l, pos.ch, pos.sticky)
    return lineObj = getLine(doc, l)
  }
  function moveOnce(boundToLine) {
    var next
    if (visually) {
      next = moveVisually(doc.cm, lineObj, pos, dir)
    } else {
      next = moveLogically(lineObj, pos, dir)
    }
    if (next == null) {
      if (!boundToLine && findNextLine())
        { pos = endOfLine(visually, doc.cm, lineObj, pos.line, dir) }
      else
        { return false }
    } else {
      pos = next
    }
    return true
  }

  if (unit == "char") {
    moveOnce()
  } else if (unit == "column") {
    moveOnce(true)
  } else if (unit == "word" || unit == "group") {
    var sawType = null, group = unit == "group"
    var helper = doc.cm && doc.cm.getHelper(pos, "wordChars")
    for (var first = true;; first = false) {
      if (dir < 0 && !moveOnce(!first)) { break }
      var cur = lineObj.text.charAt(pos.ch) || "\n"
      var type = isWordChar(cur, helper) ? "w"
        : group && cur == "\n" ? "n"
        : !group || /\s/.test(cur) ? null
        : "p"
      if (group && !first && !type) { type = "s" }
      if (sawType && sawType != type) {
        if (dir < 0) {dir = 1; moveOnce(); pos.sticky = "after"}
        break
      }

      if (type) { sawType = type }
      if (dir > 0 && !moveOnce(!first)) { break }
    }
  }
  var result = skipAtomic(doc, pos, oldPos, origDir, true)
  if (equalCursorPos(oldPos, result)) { result.hitSide = true }
  return result
}

// For relative vertical movement. Dir may be -1 or 1. Unit can be
// "page" or "line". The resulting position will have a hitSide=true
// property if it reached the end of the document.
function findPosV(cm, pos, dir, unit) {
  var doc = cm.doc, x = pos.left, y
  if (unit == "page") {
    var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight)
    var moveAmount = Math.max(pageSize - .5 * textHeight(cm.display), 3)
    y = (dir > 0 ? pos.bottom : pos.top) + dir * moveAmount

  } else if (unit == "line") {
    y = dir > 0 ? pos.bottom + 3 : pos.top - 3
  }
  var target
  for (;;) {
    target = coordsChar(cm, x, y)
    if (!target.outside) { break }
    if (dir < 0 ? y <= 0 : y >= doc.height) { target.hitSide = true; break }
    y += dir * 5
  }
  return target
}

// CONTENTEDITABLE INPUT STYLE

var ContentEditableInput = function(cm) {
  this.cm = cm
  this.lastAnchorNode = this.lastAnchorOffset = this.lastFocusNode = this.lastFocusOffset = null
  this.polling = new Delayed()
  this.composing = null
  this.gracePeriod = false
  this.readDOMTimeout = null
};

ContentEditableInput.prototype.init = function (display) {
    var this$1 = this;

  var input = this, cm = input.cm
  var div = input.div = display.lineDiv
  disableBrowserMagic(div, cm.options.spellcheck)

  on(div, "paste", function (e) {
    if (signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }
    // IE doesn't fire input events, so we schedule a read for the pasted content in this way
    if (ie_version <= 11) { setTimeout(operation(cm, function () { return this$1.updateFromDOM(); }), 20) }
  })

  on(div, "compositionstart", function (e) {
    this$1.composing = {data: e.data, done: false}
  })
  on(div, "compositionupdate", function (e) {
    if (!this$1.composing) { this$1.composing = {data: e.data, done: false} }
  })
  on(div, "compositionend", function (e) {
    if (this$1.composing) {
      if (e.data != this$1.composing.data) { this$1.readFromDOMSoon() }
      this$1.composing.done = true
    }
  })

  on(div, "touchstart", function () { return input.forceCompositionEnd(); })

  on(div, "input", function () {
    if (!this$1.composing) { this$1.readFromDOMSoon() }
  })

  function onCopyCut(e) {
    if (signalDOMEvent(cm, e)) { return }
    if (cm.somethingSelected()) {
      setLastCopied({lineWise: false, text: cm.getSelections()})
      if (e.type == "cut") { cm.replaceSelection("", null, "cut") }
    } else if (!cm.options.lineWiseCopyCut) {
      return
    } else {
      var ranges = copyableRanges(cm)
      setLastCopied({lineWise: true, text: ranges.text})
      if (e.type == "cut") {
        cm.operation(function () {
          cm.setSelections(ranges.ranges, 0, sel_dontScroll)
          cm.replaceSelection("", null, "cut")
        })
      }
    }
    if (e.clipboardData) {
      e.clipboardData.clearData()
      var content = lastCopied.text.join("\n")
      // iOS exposes the clipboard API, but seems to discard content inserted into it
      e.clipboardData.setData("Text", content)
      if (e.clipboardData.getData("Text") == content) {
        e.preventDefault()
        return
      }
    }
    // Old-fashioned briefly-focus-a-textarea hack
    var kludge = hiddenTextarea(), te = kludge.firstChild
    cm.display.lineSpace.insertBefore(kludge, cm.display.lineSpace.firstChild)
    te.value = lastCopied.text.join("\n")
    var hadFocus = document.activeElement
    selectInput(te)
    setTimeout(function () {
      cm.display.lineSpace.removeChild(kludge)
      hadFocus.focus()
      if (hadFocus == div) { input.showPrimarySelection() }
    }, 50)
  }
  on(div, "copy", onCopyCut)
  on(div, "cut", onCopyCut)
};

ContentEditableInput.prototype.prepareSelection = function () {
  var result = prepareSelection(this.cm, false)
  result.focus = this.cm.state.focused
  return result
};

ContentEditableInput.prototype.showSelection = function (info, takeFocus) {
  if (!info || !this.cm.display.view.length) { return }
  if (info.focus || takeFocus) { this.showPrimarySelection() }
  this.showMultipleSelections(info)
};

ContentEditableInput.prototype.showPrimarySelection = function () {
  var sel = window.getSelection(), cm = this.cm, prim = cm.doc.sel.primary()
  var from = prim.from(), to = prim.to()

  if (cm.display.viewTo == cm.display.viewFrom || from.line >= cm.display.viewTo || to.line < cm.display.viewFrom) {
    sel.removeAllRanges()
    return
  }

  var curAnchor = domToPos(cm, sel.anchorNode, sel.anchorOffset)
  var curFocus = domToPos(cm, sel.focusNode, sel.focusOffset)
  if (curAnchor && !curAnchor.bad && curFocus && !curFocus.bad &&
      cmp(minPos(curAnchor, curFocus), from) == 0 &&
      cmp(maxPos(curAnchor, curFocus), to) == 0)
    { return }

  var view = cm.display.view
  var start = (from.line >= cm.display.viewFrom && posToDOM(cm, from)) ||
      {node: view[0].measure.map[2], offset: 0}
  var end = to.line < cm.display.viewTo && posToDOM(cm, to)
  if (!end) {
    var measure = view[view.length - 1].measure
    var map = measure.maps ? measure.maps[measure.maps.length - 1] : measure.map
    end = {node: map[map.length - 1], offset: map[map.length - 2] - map[map.length - 3]}
  }

  if (!start || !end) {
    sel.removeAllRanges()
    return
  }

  var old = sel.rangeCount && sel.getRangeAt(0), rng
  try { rng = range(start.node, start.offset, end.offset, end.node) }
  catch(e) {} // Our model of the DOM might be outdated, in which case the range we try to set can be impossible
  if (rng) {
    if (!gecko && cm.state.focused) {
      sel.collapse(start.node, start.offset)
      if (!rng.collapsed) {
        sel.removeAllRanges()
        sel.addRange(rng)
      }
    } else {
      sel.removeAllRanges()
      sel.addRange(rng)
    }
    if (old && sel.anchorNode == null) { sel.addRange(old) }
    else if (gecko) { this.startGracePeriod() }
  }
  this.rememberSelection()
};

ContentEditableInput.prototype.startGracePeriod = function () {
    var this$1 = this;

  clearTimeout(this.gracePeriod)
  this.gracePeriod = setTimeout(function () {
    this$1.gracePeriod = false
    if (this$1.selectionChanged())
      { this$1.cm.operation(function () { return this$1.cm.curOp.selectionChanged = true; }) }
  }, 20)
};

ContentEditableInput.prototype.showMultipleSelections = function (info) {
  removeChildrenAndAdd(this.cm.display.cursorDiv, info.cursors)
  removeChildrenAndAdd(this.cm.display.selectionDiv, info.selection)
};

ContentEditableInput.prototype.rememberSelection = function () {
  var sel = window.getSelection()
  this.lastAnchorNode = sel.anchorNode; this.lastAnchorOffset = sel.anchorOffset
  this.lastFocusNode = sel.focusNode; this.lastFocusOffset = sel.focusOffset
};

ContentEditableInput.prototype.selectionInEditor = function () {
  var sel = window.getSelection()
  if (!sel.rangeCount) { return false }
  var node = sel.getRangeAt(0).commonAncestorContainer
  return contains(this.div, node)
};

ContentEditableInput.prototype.focus = function () {
  if (this.cm.options.readOnly != "nocursor") {
    if (!this.selectionInEditor())
      { this.showSelection(this.prepareSelection(), true) }
    this.div.focus()
  }
};
ContentEditableInput.prototype.blur = function () { this.div.blur() };
ContentEditableInput.prototype.getField = function () { return this.div };

ContentEditableInput.prototype.supportsTouch = function () { return true };

ContentEditableInput.prototype.receivedFocus = function () {
  var input = this
  if (this.selectionInEditor())
    { this.pollSelection() }
  else
    { runInOp(this.cm, function () { return input.cm.curOp.selectionChanged = true; }) }

  function poll() {
    if (input.cm.state.focused) {
      input.pollSelection()
      input.polling.set(input.cm.options.pollInterval, poll)
    }
  }
  this.polling.set(this.cm.options.pollInterval, poll)
};

ContentEditableInput.prototype.selectionChanged = function () {
  var sel = window.getSelection()
  return sel.anchorNode != this.lastAnchorNode || sel.anchorOffset != this.lastAnchorOffset ||
    sel.focusNode != this.lastFocusNode || sel.focusOffset != this.lastFocusOffset
};

ContentEditableInput.prototype.pollSelection = function () {
  if (this.readDOMTimeout != null || this.gracePeriod || !this.selectionChanged()) { return }
  var sel = window.getSelection(), cm = this.cm
  // On Android Chrome (version 56, at least), backspacing into an
  // uneditable block element will put the cursor in that element,
  // and then, because it's not editable, hide the virtual keyboard.
  // Because Android doesn't allow us to actually detect backspace
  // presses in a sane way, this code checks for when that happens
  // and simulates a backspace press in this case.
  if (android && chrome && this.cm.options.gutters.length && isInGutter(sel.anchorNode)) {
    this.cm.triggerOnKeyDown({type: "keydown", keyCode: 8, preventDefault: Math.abs})
    this.blur()
    this.focus()
    return
  }
  if (this.composing) { return }
  this.rememberSelection()
  var anchor = domToPos(cm, sel.anchorNode, sel.anchorOffset)
  var head = domToPos(cm, sel.focusNode, sel.focusOffset)
  if (anchor && head) { runInOp(cm, function () {
    setSelection(cm.doc, simpleSelection(anchor, head), sel_dontScroll)
    if (anchor.bad || head.bad) { cm.curOp.selectionChanged = true }
  }) }
};

ContentEditableInput.prototype.pollContent = function () {
  if (this.readDOMTimeout != null) {
    clearTimeout(this.readDOMTimeout)
    this.readDOMTimeout = null
  }

  var cm = this.cm, display = cm.display, sel = cm.doc.sel.primary()
  var from = sel.from(), to = sel.to()
  if (from.ch == 0 && from.line > cm.firstLine())
    { from = Pos(from.line - 1, getLine(cm.doc, from.line - 1).length) }
  if (to.ch == getLine(cm.doc, to.line).text.length && to.line < cm.lastLine())
    { to = Pos(to.line + 1, 0) }
  if (from.line < display.viewFrom || to.line > display.viewTo - 1) { return false }

  var fromIndex, fromLine, fromNode
  if (from.line == display.viewFrom || (fromIndex = findViewIndex(cm, from.line)) == 0) {
    fromLine = lineNo(display.view[0].line)
    fromNode = display.view[0].node
  } else {
    fromLine = lineNo(display.view[fromIndex].line)
    fromNode = display.view[fromIndex - 1].node.nextSibling
  }
  var toIndex = findViewIndex(cm, to.line)
  var toLine, toNode
  if (toIndex == display.view.length - 1) {
    toLine = display.viewTo - 1
    toNode = display.lineDiv.lastChild
  } else {
    toLine = lineNo(display.view[toIndex + 1].line) - 1
    toNode = display.view[toIndex + 1].node.previousSibling
  }

  if (!fromNode) { return false }
  var newText = cm.doc.splitLines(domTextBetween(cm, fromNode, toNode, fromLine, toLine))
  var oldText = getBetween(cm.doc, Pos(fromLine, 0), Pos(toLine, getLine(cm.doc, toLine).text.length))
  while (newText.length > 1 && oldText.length > 1) {
    if (lst(newText) == lst(oldText)) { newText.pop(); oldText.pop(); toLine-- }
    else if (newText[0] == oldText[0]) { newText.shift(); oldText.shift(); fromLine++ }
    else { break }
  }

  var cutFront = 0, cutEnd = 0
  var newTop = newText[0], oldTop = oldText[0], maxCutFront = Math.min(newTop.length, oldTop.length)
  while (cutFront < maxCutFront && newTop.charCodeAt(cutFront) == oldTop.charCodeAt(cutFront))
    { ++cutFront }
  var newBot = lst(newText), oldBot = lst(oldText)
  var maxCutEnd = Math.min(newBot.length - (newText.length == 1 ? cutFront : 0),
                           oldBot.length - (oldText.length == 1 ? cutFront : 0))
  while (cutEnd < maxCutEnd &&
         newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1))
    { ++cutEnd }
  // Try to move start of change to start of selection if ambiguous
  if (newText.length == 1 && oldText.length == 1 && fromLine == from.line) {
    while (cutFront && cutFront > from.ch &&
           newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1)) {
      cutFront--
      cutEnd++
    }
  }

  newText[newText.length - 1] = newBot.slice(0, newBot.length - cutEnd).replace(/^\u200b+/, "")
  newText[0] = newText[0].slice(cutFront).replace(/\u200b+$/, "")

  var chFrom = Pos(fromLine, cutFront)
  var chTo = Pos(toLine, oldText.length ? lst(oldText).length - cutEnd : 0)
  if (newText.length > 1 || newText[0] || cmp(chFrom, chTo)) {
    replaceRange(cm.doc, newText, chFrom, chTo, "+input")
    return true
  }
};

ContentEditableInput.prototype.ensurePolled = function () {
  this.forceCompositionEnd()
};
ContentEditableInput.prototype.reset = function () {
  this.forceCompositionEnd()
};
ContentEditableInput.prototype.forceCompositionEnd = function () {
  if (!this.composing) { return }
  clearTimeout(this.readDOMTimeout)
  this.composing = null
  this.updateFromDOM()
  this.div.blur()
  this.div.focus()
};
ContentEditableInput.prototype.readFromDOMSoon = function () {
    var this$1 = this;

  if (this.readDOMTimeout != null) { return }
  this.readDOMTimeout = setTimeout(function () {
    this$1.readDOMTimeout = null
    if (this$1.composing) {
      if (this$1.composing.done) { this$1.composing = null }
      else { return }
    }
    this$1.updateFromDOM()
  }, 80)
};

ContentEditableInput.prototype.updateFromDOM = function () {
    var this$1 = this;

  if (this.cm.isReadOnly() || !this.pollContent())
    { runInOp(this.cm, function () { return regChange(this$1.cm); }) }
};

ContentEditableInput.prototype.setUneditable = function (node) {
  node.contentEditable = "false"
};

ContentEditableInput.prototype.onKeyPress = function (e) {
  if (e.charCode == 0) { return }
  e.preventDefault()
  if (!this.cm.isReadOnly())
    { operation(this.cm, applyTextInput)(this.cm, String.fromCharCode(e.charCode == null ? e.keyCode : e.charCode), 0) }
};

ContentEditableInput.prototype.readOnlyChanged = function (val) {
  this.div.contentEditable = String(val != "nocursor")
};

ContentEditableInput.prototype.onContextMenu = function () {};
ContentEditableInput.prototype.resetPosition = function () {};

ContentEditableInput.prototype.needsContentAttribute = true

function posToDOM(cm, pos) {
  var view = findViewForLine(cm, pos.line)
  if (!view || view.hidden) { return null }
  var line = getLine(cm.doc, pos.line)
  var info = mapFromLineView(view, line, pos.line)

  var order = getOrder(line, cm.doc.direction), side = "left"
  if (order) {
    var partPos = getBidiPartAt(order, pos.ch)
    side = partPos % 2 ? "right" : "left"
  }
  var result = nodeAndOffsetInLineMap(info.map, pos.ch, side)
  result.offset = result.collapse == "right" ? result.end : result.start
  return result
}

function isInGutter(node) {
  for (var scan = node; scan; scan = scan.parentNode)
    { if (/CodeMirror-gutter-wrapper/.test(scan.className)) { return true } }
  return false
}

function badPos(pos, bad) { if (bad) { pos.bad = true; } return pos }

function domTextBetween(cm, from, to, fromLine, toLine) {
  var text = "", closing = false, lineSep = cm.doc.lineSeparator()
  function recognizeMarker(id) { return function (marker) { return marker.id == id; } }
  function close() {
    if (closing) {
      text += lineSep
      closing = false
    }
  }
  function addText(str) {
    if (str) {
      close()
      text += str
    }
  }
  function walk(node) {
    if (node.nodeType == 1) {
      var cmText = node.getAttribute("cm-text")
      if (cmText != null) {
        addText(cmText || node.textContent.replace(/\u200b/g, ""))
        return
      }
      var markerID = node.getAttribute("cm-marker"), range
      if (markerID) {
        var found = cm.findMarks(Pos(fromLine, 0), Pos(toLine + 1, 0), recognizeMarker(+markerID))
        if (found.length && (range = found[0].find(0)))
          { addText(getBetween(cm.doc, range.from, range.to).join(lineSep)) }
        return
      }
      if (node.getAttribute("contenteditable") == "false") { return }
      var isBlock = /^(pre|div|p)$/i.test(node.nodeName)
      if (isBlock) { close() }
      for (var i = 0; i < node.childNodes.length; i++)
        { walk(node.childNodes[i]) }
      if (isBlock) { closing = true }
    } else if (node.nodeType == 3) {
      addText(node.nodeValue)
    }
  }
  for (;;) {
    walk(from)
    if (from == to) { break }
    from = from.nextSibling
  }
  return text
}

function domToPos(cm, node, offset) {
  var lineNode
  if (node == cm.display.lineDiv) {
    lineNode = cm.display.lineDiv.childNodes[offset]
    if (!lineNode) { return badPos(cm.clipPos(Pos(cm.display.viewTo - 1)), true) }
    node = null; offset = 0
  } else {
    for (lineNode = node;; lineNode = lineNode.parentNode) {
      if (!lineNode || lineNode == cm.display.lineDiv) { return null }
      if (lineNode.parentNode && lineNode.parentNode == cm.display.lineDiv) { break }
    }
  }
  for (var i = 0; i < cm.display.view.length; i++) {
    var lineView = cm.display.view[i]
    if (lineView.node == lineNode)
      { return locateNodeInLineView(lineView, node, offset) }
  }
}

function locateNodeInLineView(lineView, node, offset) {
  var wrapper = lineView.text.firstChild, bad = false
  if (!node || !contains(wrapper, node)) { return badPos(Pos(lineNo(lineView.line), 0), true) }
  if (node == wrapper) {
    bad = true
    node = wrapper.childNodes[offset]
    offset = 0
    if (!node) {
      var line = lineView.rest ? lst(lineView.rest) : lineView.line
      return badPos(Pos(lineNo(line), line.text.length), bad)
    }
  }

  var textNode = node.nodeType == 3 ? node : null, topNode = node
  if (!textNode && node.childNodes.length == 1 && node.firstChild.nodeType == 3) {
    textNode = node.firstChild
    if (offset) { offset = textNode.nodeValue.length }
  }
  while (topNode.parentNode != wrapper) { topNode = topNode.parentNode }
  var measure = lineView.measure, maps = measure.maps

  function find(textNode, topNode, offset) {
    for (var i = -1; i < (maps ? maps.length : 0); i++) {
      var map = i < 0 ? measure.map : maps[i]
      for (var j = 0; j < map.length; j += 3) {
        var curNode = map[j + 2]
        if (curNode == textNode || curNode == topNode) {
          var line = lineNo(i < 0 ? lineView.line : lineView.rest[i])
          var ch = map[j] + offset
          if (offset < 0 || curNode != textNode) { ch = map[j + (offset ? 1 : 0)] }
          return Pos(line, ch)
        }
      }
    }
  }
  var found = find(textNode, topNode, offset)
  if (found) { return badPos(found, bad) }

  // FIXME this is all really shaky. might handle the few cases it needs to handle, but likely to cause problems
  for (var after = topNode.nextSibling, dist = textNode ? textNode.nodeValue.length - offset : 0; after; after = after.nextSibling) {
    found = find(after, after.firstChild, 0)
    if (found)
      { return badPos(Pos(found.line, found.ch - dist), bad) }
    else
      { dist += after.textContent.length }
  }
  for (var before = topNode.previousSibling, dist$1 = offset; before; before = before.previousSibling) {
    found = find(before, before.firstChild, -1)
    if (found)
      { return badPos(Pos(found.line, found.ch + dist$1), bad) }
    else
      { dist$1 += before.textContent.length }
  }
}

// TEXTAREA INPUT STYLE

var TextareaInput = function(cm) {
  this.cm = cm
  // See input.poll and input.reset
  this.prevInput = ""

  // Flag that indicates whether we expect input to appear real soon
  // now (after some event like 'keypress' or 'input') and are
  // polling intensively.
  this.pollingFast = false
  // Self-resetting timeout for the poller
  this.polling = new Delayed()
  // Used to work around IE issue with selection being forgotten when focus moves away from textarea
  this.hasSelection = false
  this.composing = null
};

TextareaInput.prototype.init = function (display) {
    var this$1 = this;

  var input = this, cm = this.cm
  this.createField(display)
  var te = this.textarea

  display.wrapper.insertBefore(this.wrapper, display.wrapper.firstChild)

  // Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)
  if (ios) { te.style.width = "0px" }

  on(te, "input", function () {
    if (ie && ie_version >= 9 && this$1.hasSelection) { this$1.hasSelection = null }
    input.poll()
  })

  on(te, "paste", function (e) {
    if (signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }

    cm.state.pasteIncoming = true
    input.fastPoll()
  })

  function prepareCopyCut(e) {
    if (signalDOMEvent(cm, e)) { return }
    if (cm.somethingSelected()) {
      setLastCopied({lineWise: false, text: cm.getSelections()})
    } else if (!cm.options.lineWiseCopyCut) {
      return
    } else {
      var ranges = copyableRanges(cm)
      setLastCopied({lineWise: true, text: ranges.text})
      if (e.type == "cut") {
        cm.setSelections(ranges.ranges, null, sel_dontScroll)
      } else {
        input.prevInput = ""
        te.value = ranges.text.join("\n")
        selectInput(te)
      }
    }
    if (e.type == "cut") { cm.state.cutIncoming = true }
  }
  on(te, "cut", prepareCopyCut)
  on(te, "copy", prepareCopyCut)

  on(display.scroller, "paste", function (e) {
    if (eventInWidget(display, e) || signalDOMEvent(cm, e)) { return }
    cm.state.pasteIncoming = true
    input.focus()
  })

  // Prevent normal selection in the editor (we handle our own)
  on(display.lineSpace, "selectstart", function (e) {
    if (!eventInWidget(display, e)) { e_preventDefault(e) }
  })

  on(te, "compositionstart", function () {
    var start = cm.getCursor("from")
    if (input.composing) { input.composing.range.clear() }
    input.composing = {
      start: start,
      range: cm.markText(start, cm.getCursor("to"), {className: "CodeMirror-composing"})
    }
  })
  on(te, "compositionend", function () {
    if (input.composing) {
      input.poll()
      input.composing.range.clear()
      input.composing = null
    }
  })
};

TextareaInput.prototype.createField = function (_display) {
  // Wraps and hides input textarea
  this.wrapper = hiddenTextarea()
  // The semihidden textarea that is focused when the editor is
  // focused, and receives input.
  this.textarea = this.wrapper.firstChild
};

TextareaInput.prototype.prepareSelection = function () {
  // Redraw the selection and/or cursor
  var cm = this.cm, display = cm.display, doc = cm.doc
  var result = prepareSelection(cm)

  // Move the hidden textarea near the cursor to prevent scrolling artifacts
  if (cm.options.moveInputWithCursor) {
    var headPos = cursorCoords(cm, doc.sel.primary().head, "div")
    var wrapOff = display.wrapper.getBoundingClientRect(), lineOff = display.lineDiv.getBoundingClientRect()
    result.teTop = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
                                        headPos.top + lineOff.top - wrapOff.top))
    result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
                                         headPos.left + lineOff.left - wrapOff.left))
  }

  return result
};

TextareaInput.prototype.showSelection = function (drawn) {
  var cm = this.cm, display = cm.display
  removeChildrenAndAdd(display.cursorDiv, drawn.cursors)
  removeChildrenAndAdd(display.selectionDiv, drawn.selection)
  if (drawn.teTop != null) {
    this.wrapper.style.top = drawn.teTop + "px"
    this.wrapper.style.left = drawn.teLeft + "px"
  }
};

// Reset the input to correspond to the selection (or to be empty,
// when not typing and nothing is selected)
TextareaInput.prototype.reset = function (typing) {
  if (this.contextMenuPending || this.composing) { return }
  var cm = this.cm
  if (cm.somethingSelected()) {
    this.prevInput = ""
    var content = cm.getSelection()
    this.textarea.value = content
    if (cm.state.focused) { selectInput(this.textarea) }
    if (ie && ie_version >= 9) { this.hasSelection = content }
  } else if (!typing) {
    this.prevInput = this.textarea.value = ""
    if (ie && ie_version >= 9) { this.hasSelection = null }
  }
};

TextareaInput.prototype.getField = function () { return this.textarea };

TextareaInput.prototype.supportsTouch = function () { return false };

TextareaInput.prototype.focus = function () {
  if (this.cm.options.readOnly != "nocursor" && (!mobile || activeElt() != this.textarea)) {
    try { this.textarea.focus() }
    catch (e) {} // IE8 will throw if the textarea is display: none or not in DOM
  }
};

TextareaInput.prototype.blur = function () { this.textarea.blur() };

TextareaInput.prototype.resetPosition = function () {
  this.wrapper.style.top = this.wrapper.style.left = 0
};

TextareaInput.prototype.receivedFocus = function () { this.slowPoll() };

// Poll for input changes, using the normal rate of polling. This
// runs as long as the editor is focused.
TextareaInput.prototype.slowPoll = function () {
    var this$1 = this;

  if (this.pollingFast) { return }
  this.polling.set(this.cm.options.pollInterval, function () {
    this$1.poll()
    if (this$1.cm.state.focused) { this$1.slowPoll() }
  })
};

// When an event has just come in that is likely to add or change
// something in the input textarea, we poll faster, to ensure that
// the change appears on the screen quickly.
TextareaInput.prototype.fastPoll = function () {
  var missed = false, input = this
  input.pollingFast = true
  function p() {
    var changed = input.poll()
    if (!changed && !missed) {missed = true; input.polling.set(60, p)}
    else {input.pollingFast = false; input.slowPoll()}
  }
  input.polling.set(20, p)
};

// Read input from the textarea, and update the document to match.
// When something is selected, it is present in the textarea, and
// selected (unless it is huge, in which case a placeholder is
// used). When nothing is selected, the cursor sits after previously
// seen text (can be empty), which is stored in prevInput (we must
// not reset the textarea when typing, because that breaks IME).
TextareaInput.prototype.poll = function () {
    var this$1 = this;

  var cm = this.cm, input = this.textarea, prevInput = this.prevInput
  // Since this is called a *lot*, try to bail out as cheaply as
  // possible when it is clear that nothing happened. hasSelection
  // will be the case when there is a lot of text in the textarea,
  // in which case reading its value would be expensive.
  if (this.contextMenuPending || !cm.state.focused ||
      (hasSelection(input) && !prevInput && !this.composing) ||
      cm.isReadOnly() || cm.options.disableInput || cm.state.keySeq)
    { return false }

  var text = input.value
  // If nothing changed, bail.
  if (text == prevInput && !cm.somethingSelected()) { return false }
  // Work around nonsensical selection resetting in IE9/10, and
  // inexplicable appearance of private area unicode characters on
  // some key combos in Mac (#2689).
  if (ie && ie_version >= 9 && this.hasSelection === text ||
      mac && /[\uf700-\uf7ff]/.test(text)) {
    cm.display.input.reset()
    return false
  }

  if (cm.doc.sel == cm.display.selForContextMenu) {
    var first = text.charCodeAt(0)
    if (first == 0x200b && !prevInput) { prevInput = "\u200b" }
    if (first == 0x21da) { this.reset(); return this.cm.execCommand("undo") }
  }
  // Find the part of the input that is actually new
  var same = 0, l = Math.min(prevInput.length, text.length)
  while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) { ++same }

  runInOp(cm, function () {
    applyTextInput(cm, text.slice(same), prevInput.length - same,
                   null, this$1.composing ? "*compose" : null)

    // Don't leave long text in the textarea, since it makes further polling slow
    if (text.length > 1000 || text.indexOf("\n") > -1) { input.value = this$1.prevInput = "" }
    else { this$1.prevInput = text }

    if (this$1.composing) {
      this$1.composing.range.clear()
      this$1.composing.range = cm.markText(this$1.composing.start, cm.getCursor("to"),
                                         {className: "CodeMirror-composing"})
    }
  })
  return true
};

TextareaInput.prototype.ensurePolled = function () {
  if (this.pollingFast && this.poll()) { this.pollingFast = false }
};

TextareaInput.prototype.onKeyPress = function () {
  if (ie && ie_version >= 9) { this.hasSelection = null }
  this.fastPoll()
};

TextareaInput.prototype.onContextMenu = function (e) {
  var input = this, cm = input.cm, display = cm.display, te = input.textarea
  var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop
  if (!pos || presto) { return } // Opera is difficult.

  // Reset the current text selection only if the click is done outside of the selection
  // and 'resetSelectionOnContextMenu' option is true.
  var reset = cm.options.resetSelectionOnContextMenu
  if (reset && cm.doc.sel.contains(pos) == -1)
    { operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll) }

  var oldCSS = te.style.cssText, oldWrapperCSS = input.wrapper.style.cssText
  input.wrapper.style.cssText = "position: absolute"
  var wrapperBox = input.wrapper.getBoundingClientRect()
  te.style.cssText = "position: absolute; width: 30px; height: 30px;\n      top: " + (e.clientY - wrapperBox.top - 5) + "px; left: " + (e.clientX - wrapperBox.left - 5) + "px;\n      z-index: 1000; background: " + (ie ? "rgba(255, 255, 255, .05)" : "transparent") + ";\n      outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);"
  var oldScrollY
  if (webkit) { oldScrollY = window.scrollY } // Work around Chrome issue (#2712)
  display.input.focus()
  if (webkit) { window.scrollTo(null, oldScrollY) }
  display.input.reset()
  // Adds "Select all" to context menu in FF
  if (!cm.somethingSelected()) { te.value = input.prevInput = " " }
  input.contextMenuPending = true
  display.selForContextMenu = cm.doc.sel
  clearTimeout(display.detectingSelectAll)

  // Select-all will be greyed out if there's nothing to select, so
  // this adds a zero-width space so that we can later check whether
  // it got selected.
  function prepareSelectAllHack() {
    if (te.selectionStart != null) {
      var selected = cm.somethingSelected()
      var extval = "\u200b" + (selected ? te.value : "")
      te.value = "\u21da" // Used to catch context-menu undo
      te.value = extval
      input.prevInput = selected ? "" : "\u200b"
      te.selectionStart = 1; te.selectionEnd = extval.length
      // Re-set this, in case some other handler touched the
      // selection in the meantime.
      display.selForContextMenu = cm.doc.sel
    }
  }
  function rehide() {
    input.contextMenuPending = false
    input.wrapper.style.cssText = oldWrapperCSS
    te.style.cssText = oldCSS
    if (ie && ie_version < 9) { display.scrollbars.setScrollTop(display.scroller.scrollTop = scrollPos) }

    // Try to detect the user choosing select-all
    if (te.selectionStart != null) {
      if (!ie || (ie && ie_version < 9)) { prepareSelectAllHack() }
      var i = 0, poll = function () {
        if (display.selForContextMenu == cm.doc.sel && te.selectionStart == 0 &&
            te.selectionEnd > 0 && input.prevInput == "\u200b") {
          operation(cm, selectAll)(cm)
        } else if (i++ < 10) {
          display.detectingSelectAll = setTimeout(poll, 500)
        } else {
          display.selForContextMenu = null
          display.input.reset()
        }
      }
      display.detectingSelectAll = setTimeout(poll, 200)
    }
  }

  if (ie && ie_version >= 9) { prepareSelectAllHack() }
  if (captureRightClick) {
    e_stop(e)
    var mouseup = function () {
      off(window, "mouseup", mouseup)
      setTimeout(rehide, 20)
    }
    on(window, "mouseup", mouseup)
  } else {
    setTimeout(rehide, 50)
  }
};

TextareaInput.prototype.readOnlyChanged = function (val) {
  if (!val) { this.reset() }
  this.textarea.disabled = val == "nocursor"
};

TextareaInput.prototype.setUneditable = function () {};

TextareaInput.prototype.needsContentAttribute = false

function fromTextArea(textarea, options) {
  options = options ? copyObj(options) : {}
  options.value = textarea.value
  if (!options.tabindex && textarea.tabIndex)
    { options.tabindex = textarea.tabIndex }
  if (!options.placeholder && textarea.placeholder)
    { options.placeholder = textarea.placeholder }
  // Set autofocus to true if this textarea is focused, or if it has
  // autofocus and no other element is focused.
  if (options.autofocus == null) {
    var hasFocus = activeElt()
    options.autofocus = hasFocus == textarea ||
      textarea.getAttribute("autofocus") != null && hasFocus == document.body
  }

  function save() {textarea.value = cm.getValue()}

  var realSubmit
  if (textarea.form) {
    on(textarea.form, "submit", save)
    // Deplorable hack to make the submit method do the right thing.
    if (!options.leaveSubmitMethodAlone) {
      var form = textarea.form
      realSubmit = form.submit
      try {
        var wrappedSubmit = form.submit = function () {
          save()
          form.submit = realSubmit
          form.submit()
          form.submit = wrappedSubmit
        }
      } catch(e) {}
    }
  }

  options.finishInit = function (cm) {
    cm.save = save
    cm.getTextArea = function () { return textarea; }
    cm.toTextArea = function () {
      cm.toTextArea = isNaN // Prevent this from being ran twice
      save()
      textarea.parentNode.removeChild(cm.getWrapperElement())
      textarea.style.display = ""
      if (textarea.form) {
        off(textarea.form, "submit", save)
        if (typeof textarea.form.submit == "function")
          { textarea.form.submit = realSubmit }
      }
    }
  }

  textarea.style.display = "none"
  var cm = CodeMirror(function (node) { return textarea.parentNode.insertBefore(node, textarea.nextSibling); },
    options)
  return cm
}

function addLegacyProps(CodeMirror) {
  CodeMirror.off = off
  CodeMirror.on = on
  CodeMirror.wheelEventPixels = wheelEventPixels
  CodeMirror.Doc = Doc
  CodeMirror.splitLines = splitLinesAuto
  CodeMirror.countColumn = countColumn
  CodeMirror.findColumn = findColumn
  CodeMirror.isWordChar = isWordCharBasic
  CodeMirror.Pass = Pass
  CodeMirror.signal = signal
  CodeMirror.Line = Line
  CodeMirror.changeEnd = changeEnd
  CodeMirror.scrollbarModel = scrollbarModel
  CodeMirror.Pos = Pos
  CodeMirror.cmpPos = cmp
  CodeMirror.modes = modes
  CodeMirror.mimeModes = mimeModes
  CodeMirror.resolveMode = resolveMode
  CodeMirror.getMode = getMode
  CodeMirror.modeExtensions = modeExtensions
  CodeMirror.extendMode = extendMode
  CodeMirror.copyState = copyState
  CodeMirror.startState = startState
  CodeMirror.innerMode = innerMode
  CodeMirror.commands = commands
  CodeMirror.keyMap = keyMap
  CodeMirror.keyName = keyName
  CodeMirror.isModifierKey = isModifierKey
  CodeMirror.lookupKey = lookupKey
  CodeMirror.normalizeKeyMap = normalizeKeyMap
  CodeMirror.StringStream = StringStream
  CodeMirror.SharedTextMarker = SharedTextMarker
  CodeMirror.TextMarker = TextMarker
  CodeMirror.LineWidget = LineWidget
  CodeMirror.e_preventDefault = e_preventDefault
  CodeMirror.e_stopPropagation = e_stopPropagation
  CodeMirror.e_stop = e_stop
  CodeMirror.addClass = addClass
  CodeMirror.contains = contains
  CodeMirror.rmClass = rmClass
  CodeMirror.keyNames = keyNames
}

// EDITOR CONSTRUCTOR

defineOptions(CodeMirror)

addEditorMethods(CodeMirror)

// Set up methods on CodeMirror's prototype to redirect to the editor's document.
var dontDelegate = "iter insert remove copy getEditor constructor".split(" ")
for (var prop in Doc.prototype) { if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0)
  { CodeMirror.prototype[prop] = (function(method) {
    return function() {return method.apply(this.doc, arguments)}
  })(Doc.prototype[prop]) } }

eventMixin(Doc)

// INPUT HANDLING

CodeMirror.inputStyles = {"textarea": TextareaInput, "contenteditable": ContentEditableInput}

// MODE DEFINITION AND QUERYING

// Extra arguments are stored as the mode's dependencies, which is
// used by (legacy) mechanisms like loadmode.js to automatically
// load a mode. (Preferred mechanism is the require/define calls.)
CodeMirror.defineMode = function(name/*, mode, …*/) {
  if (!CodeMirror.defaults.mode && name != "null") { CodeMirror.defaults.mode = name }
  defineMode.apply(this, arguments)
}

CodeMirror.defineMIME = defineMIME

// Minimal default mode.
CodeMirror.defineMode("null", function () { return ({token: function (stream) { return stream.skipToEnd(); }}); })
CodeMirror.defineMIME("text/plain", "null")

// EXTENSIONS

CodeMirror.defineExtension = function (name, func) {
  CodeMirror.prototype[name] = func
}
CodeMirror.defineDocExtension = function (name, func) {
  Doc.prototype[name] = func
}

CodeMirror.fromTextArea = fromTextArea

addLegacyProps(CodeMirror)

CodeMirror.version = "5.36.0"

return CodeMirror;

})));
// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    mod(require("../../lib/codemirror"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["../../lib/codemirror"], mod);
  else // Plain browser env
    mod(CodeMirror);
})(function(CodeMirror) {
"use strict";

var htmlConfig = {
  autoSelfClosers: {'area': true, 'base': true, 'br': true, 'col': true, 'command': true,
                    'embed': true, 'frame': true, 'hr': true, 'img': true, 'input': true,
                    'keygen': true, 'link': true, 'meta': true, 'param': true, 'source': true,
                    'track': true, 'wbr': true, 'menuitem': true},
  implicitlyClosed: {'dd': true, 'li': true, 'optgroup': true, 'option': true, 'p': true,
                     'rp': true, 'rt': true, 'tbody': true, 'td': true, 'tfoot': true,
                     'th': true, 'tr': true},
  contextGrabbers: {
    'dd': {'dd': true, 'dt': true},
    'dt': {'dd': true, 'dt': true},
    'li': {'li': true},
    'option': {'option': true, 'optgroup': true},
    'optgroup': {'optgroup': true},
    'p': {'address': true, 'article': true, 'aside': true, 'blockquote': true, 'dir': true,
          'div': true, 'dl': true, 'fieldset': true, 'footer': true, 'form': true,
          'h1': true, 'h2': true, 'h3': true, 'h4': true, 'h5': true, 'h6': true,
          'header': true, 'hgroup': true, 'hr': true, 'menu': true, 'nav': true, 'ol': true,
          'p': true, 'pre': true, 'section': true, 'table': true, 'ul': true},
    'rp': {'rp': true, 'rt': true},
    'rt': {'rp': true, 'rt': true},
    'tbody': {'tbody': true, 'tfoot': true},
    'td': {'td': true, 'th': true},
    'tfoot': {'tbody': true},
    'th': {'td': true, 'th': true},
    'thead': {'tbody': true, 'tfoot': true},
    'tr': {'tr': true}
  },
  doNotIndent: {"pre": true},
  allowUnquoted: true,
  allowMissing: true,
  caseFold: true
}

var xmlConfig = {
  autoSelfClosers: {},
  implicitlyClosed: {},
  contextGrabbers: {},
  doNotIndent: {},
  allowUnquoted: false,
  allowMissing: false,
  allowMissingTagName: false,
  caseFold: false
}

CodeMirror.defineMode("xml", function(editorConf, config_) {
  var indentUnit = editorConf.indentUnit
  var config = {}
  var defaults = config_.htmlMode ? htmlConfig : xmlConfig
  for (var prop in defaults) config[prop] = defaults[prop]
  for (var prop in config_) config[prop] = config_[prop]

  // Return variables for tokenizers
  var type, setStyle;

  function inText(stream, state) {
    function chain(parser) {
      state.tokenize = parser;
      return parser(stream, state);
    }

    var ch = stream.next();
    if (ch == "<") {
      if (stream.eat("!")) {
        if (stream.eat("[")) {
          if (stream.match("CDATA[")) return chain(inBlock("atom", "]]>"));
          else return null;
        } else if (stream.match("--")) {
          return chain(inBlock("comment", "-->"));
        } else if (stream.match("DOCTYPE", true, true)) {
          stream.eatWhile(/[\w\._\-]/);
          return chain(doctype(1));
        } else {
          return null;
        }
      } else if (stream.eat("?")) {
        stream.eatWhile(/[\w\._\-]/);
        state.tokenize = inBlock("meta", "?>");
        return "meta";
      } else {
        type = stream.eat("/") ? "closeTag" : "openTag";
        state.tokenize = inTag;
        return "tag bracket";
      }
    } else if (ch == "&") {
      var ok;
      if (stream.eat("#")) {
        if (stream.eat("x")) {
          ok = stream.eatWhile(/[a-fA-F\d]/) && stream.eat(";");
        } else {
          ok = stream.eatWhile(/[\d]/) && stream.eat(";");
        }
      } else {
        ok = stream.eatWhile(/[\w\.\-:]/) && stream.eat(";");
      }
      return ok ? "atom" : "error";
    } else {
      stream.eatWhile(/[^&<]/);
      return null;
    }
  }
  inText.isInText = true;

  function inTag(stream, state) {
    var ch = stream.next();
    if (ch == ">" || (ch == "/" && stream.eat(">"))) {
      state.tokenize = inText;
      type = ch == ">" ? "endTag" : "selfcloseTag";
      return "tag bracket";
    } else if (ch == "=") {
      type = "equals";
      return null;
    } else if (ch == "<") {
      state.tokenize = inText;
      state.state = baseState;
      state.tagName = state.tagStart = null;
      var next = state.tokenize(stream, state);
      return next ? next + " tag error" : "tag error";
    } else if (/[\'\"]/.test(ch)) {
      state.tokenize = inAttribute(ch);
      state.stringStartCol = stream.column();
      return state.tokenize(stream, state);
    } else {
      stream.match(/^[^\s\u00a0=<>\"\']*[^\s\u00a0=<>\"\'\/]/);
      return "word";
    }
  }

  function inAttribute(quote) {
    var closure = function(stream, state) {
      while (!stream.eol()) {
        if (stream.next() == quote) {
          state.tokenize = inTag;
          break;
        }
      }
      return "string";
    };
    closure.isInAttribute = true;
    return closure;
  }

  function inBlock(style, terminator) {
    return function(stream, state) {
      while (!stream.eol()) {
        if (stream.match(terminator)) {
          state.tokenize = inText;
          break;
        }
        stream.next();
      }
      return style;
    };
  }
  function doctype(depth) {
    return function(stream, state) {
      var ch;
      while ((ch = stream.next()) != null) {
        if (ch == "<") {
          state.tokenize = doctype(depth + 1);
          return state.tokenize(stream, state);
        } else if (ch == ">") {
          if (depth == 1) {
            state.tokenize = inText;
            break;
          } else {
            state.tokenize = doctype(depth - 1);
            return state.tokenize(stream, state);
          }
        }
      }
      return "meta";
    };
  }

  function Context(state, tagName, startOfLine) {
    this.prev = state.context;
    this.tagName = tagName;
    this.indent = state.indented;
    this.startOfLine = startOfLine;
    if (config.doNotIndent.hasOwnProperty(tagName) || (state.context && state.context.noIndent))
      this.noIndent = true;
  }
  function popContext(state) {
    if (state.context) state.context = state.context.prev;
  }
  function maybePopContext(state, nextTagName) {
    var parentTagName;
    while (true) {
      if (!state.context) {
        return;
      }
      parentTagName = state.context.tagName;
      if (!config.contextGrabbers.hasOwnProperty(parentTagName) ||
          !config.contextGrabbers[parentTagName].hasOwnProperty(nextTagName)) {
        return;
      }
      popContext(state);
    }
  }

  function baseState(type, stream, state) {
    if (type == "openTag") {
      state.tagStart = stream.column();
      return tagNameState;
    } else if (type == "closeTag") {
      return closeTagNameState;
    } else {
      return baseState;
    }
  }
  function tagNameState(type, stream, state) {
    if (type == "word") {
      state.tagName = stream.current();
      setStyle = "tag";
      return attrState;
    } else if (config.allowMissingTagName && type == "endTag") {
      setStyle = "tag bracket";
      return attrState(type, stream, state);
    } else {
      setStyle = "error";
      return tagNameState;
    }
  }
  function closeTagNameState(type, stream, state) {
    if (type == "word") {
      var tagName = stream.current();
      if (state.context && state.context.tagName != tagName &&
          config.implicitlyClosed.hasOwnProperty(state.context.tagName))
        popContext(state);
      if ((state.context && state.context.tagName == tagName) || config.matchClosing === false) {
        setStyle = "tag";
        return closeState;
      } else {
        setStyle = "tag error";
        return closeStateErr;
      }
    } else if (config.allowMissingTagName && type == "endTag") {
      setStyle = "tag bracket";
      return closeState(type, stream, state);
    } else {
      setStyle = "error";
      return closeStateErr;
    }
  }

  function closeState(type, _stream, state) {
    if (type != "endTag") {
      setStyle = "error";
      return closeState;
    }
    popContext(state);
    return baseState;
  }
  function closeStateErr(type, stream, state) {
    setStyle = "error";
    return closeState(type, stream, state);
  }

  function attrState(type, _stream, state) {
    if (type == "word") {
      setStyle = "attribute";
      return attrEqState;
    } else if (type == "endTag" || type == "selfcloseTag") {
      var tagName = state.tagName, tagStart = state.tagStart;
      state.tagName = state.tagStart = null;
      if (type == "selfcloseTag" ||
          config.autoSelfClosers.hasOwnProperty(tagName)) {
        maybePopContext(state, tagName);
      } else {
        maybePopContext(state, tagName);
        state.context = new Context(state, tagName, tagStart == state.indented);
      }
      return baseState;
    }
    setStyle = "error";
    return attrState;
  }
  function attrEqState(type, stream, state) {
    if (type == "equals") return attrValueState;
    if (!config.allowMissing) setStyle = "error";
    return attrState(type, stream, state);
  }
  function attrValueState(type, stream, state) {
    if (type == "string") return attrContinuedState;
    if (type == "word" && config.allowUnquoted) {setStyle = "string"; return attrState;}
    setStyle = "error";
    return attrState(type, stream, state);
  }
  function attrContinuedState(type, stream, state) {
    if (type == "string") return attrContinuedState;
    return attrState(type, stream, state);
  }

  return {
    startState: function(baseIndent) {
      var state = {tokenize: inText,
                   state: baseState,
                   indented: baseIndent || 0,
                   tagName: null, tagStart: null,
                   context: null}
      if (baseIndent != null) state.baseIndent = baseIndent
      return state
    },

    token: function(stream, state) {
      if (!state.tagName && stream.sol())
        state.indented = stream.indentation();

      if (stream.eatSpace()) return null;
      type = null;
      var style = state.tokenize(stream, state);
      if ((style || type) && style != "comment") {
        setStyle = null;
        state.state = state.state(type || style, stream, state);
        if (setStyle)
          style = setStyle == "error" ? style + " error" : setStyle;
      }
      return style;
    },

    indent: function(state, textAfter, fullLine) {
      var context = state.context;
      // Indent multi-line strings (e.g. css).
      if (state.tokenize.isInAttribute) {
        if (state.tagStart == state.indented)
          return state.stringStartCol + 1;
        else
          return state.indented + indentUnit;
      }
      if (context && context.noIndent) return CodeMirror.Pass;
      if (state.tokenize != inTag && state.tokenize != inText)
        return fullLine ? fullLine.match(/^(\s*)/)[0].length : 0;
      // Indent the starts of attribute names.
      if (state.tagName) {
        if (config.multilineTagIndentPastTag !== false)
          return state.tagStart + state.tagName.length + 2;
        else
          return state.tagStart + indentUnit * (config.multilineTagIndentFactor || 1);
      }
      if (config.alignCDATA && /<!\[CDATA\[/.test(textAfter)) return 0;
      var tagAfter = textAfter && /^<(\/)?([\w_:\.-]*)/.exec(textAfter);
      if (tagAfter && tagAfter[1]) { // Closing tag spotted
        while (context) {
          if (context.tagName == tagAfter[2]) {
            context = context.prev;
            break;
          } else if (config.implicitlyClosed.hasOwnProperty(context.tagName)) {
            context = context.prev;
          } else {
            break;
          }
        }
      } else if (tagAfter) { // Opening tag spotted
        while (context) {
          var grabbers = config.contextGrabbers[context.tagName];
          if (grabbers && grabbers.hasOwnProperty(tagAfter[2]))
            context = context.prev;
          else
            break;
        }
      }
      while (context && context.prev && !context.startOfLine)
        context = context.prev;
      if (context) return context.indent + indentUnit;
      else return state.baseIndent || 0;
    },

    electricInput: /<\/[\s\w:]+>$/,
    blockCommentStart: "<!--",
    blockCommentEnd: "-->",

    configuration: config.htmlMode ? "html" : "xml",
    helperType: config.htmlMode ? "html" : "xml",

    skipAttribute: function(state) {
      if (state.state == attrValueState)
        state.state = attrState
    }
  };
});

CodeMirror.defineMIME("text/xml", "xml");
CodeMirror.defineMIME("application/xml", "xml");
if (!CodeMirror.mimeModes.hasOwnProperty("text/html"))
  CodeMirror.defineMIME("text/html", {name: "xml", htmlMode: true});

});

// ============== Formatting extensions ============================
(function() {
  // Define extensions for a few modes
  CodeMirror.extendMode("css", {
    commentStart: "/*",
    commentEnd: "*/",
    wordWrapChars: [";", "\\{", "\\}"],
    autoFormatLineBreaks: function (text) {
      return text.replace(new RegExp("(;|\\{|\\})([^\r\n])", "g"), "$1\n$2");
    }
  });

  function jsNonBreakableBlocks(text) {
    var nonBreakableRegexes = [/for\s*?\((.*?)\)/,
                               /\"(.*?)(\"|$)/,
                               /\'(.*?)(\'|$)/,
                               /\/\*(.*?)(\*\/|$)/,
                               /\/\/.*/];
    var nonBreakableBlocks = [];
    for (var i = 0; i < nonBreakableRegexes.length; i++) {
      var curPos = 0;
      while (curPos < text.length) {
        var m = text.substr(curPos).match(nonBreakableRegexes[i]);
        if (m != null) {
          nonBreakableBlocks.push({
            start: curPos + m.index,
            end: curPos + m.index + m[0].length
          });
          curPos += m.index + Math.max(1, m[0].length);
        }
        else { // No more matches
          break;
        }
      }
    }
    nonBreakableBlocks.sort(function (a, b) {
      return a.start - b.start;
    });

    return nonBreakableBlocks;
  }

  CodeMirror.extendMode("javascript", {
    commentStart: "/*",
    commentEnd: "*/",
    wordWrapChars: [";", "\\{", "\\}"],

    autoFormatLineBreaks: function (text) {
      var curPos = 0;
      var split = this.jsonMode ? function(str) {
        return str.replace(/([,{])/g, "$1\n").replace(/}/g, "\n}");
      } : function(str) {
        return str.replace(/(;|\{|\})([^\r\n;])/g, "$1\n$2");
      };
      var nonBreakableBlocks = jsNonBreakableBlocks(text), res = "";
      if (nonBreakableBlocks != null) {
        for (var i = 0; i < nonBreakableBlocks.length; i++) {
          if (nonBreakableBlocks[i].start > curPos) { // Break lines till the block
            res += split(text.substring(curPos, nonBreakableBlocks[i].start));
            curPos = nonBreakableBlocks[i].start;
          }
          if (nonBreakableBlocks[i].start <= curPos
              && nonBreakableBlocks[i].end >= curPos) { // Skip non-breakable block
            res += text.substring(curPos, nonBreakableBlocks[i].end);
            curPos = nonBreakableBlocks[i].end;
          }
        }
        if (curPos < text.length)
          res += split(text.substr(curPos));
      } else {
        res = split(text);
      }
      return res.replace(/^\n*|\n*$/, "");
    }
  });

  CodeMirror.extendMode("xml", {
    commentStart: "<!--",
    commentEnd: "-->",
    wordWrapChars: [">"],

    autoFormatLineBreaks: function (text) {
      var lines = text.split("\n");
      var reProcessedPortion = new RegExp("(^\\s*?<|^[^<]*?)(.+)(>\\s*?$|[^>]*?$)");
      var reOpenBrackets = new RegExp("<", "g");
      var reCloseBrackets = new RegExp("(>)([^\r\n])", "g");
      for (var i = 0; i < lines.length; i++) {
        var mToProcess = lines[i].match(reProcessedPortion);
        if (mToProcess != null && mToProcess.length > 3) { // The line starts with whitespaces and ends with whitespaces
          lines[i] = mToProcess[1]
            + mToProcess[2].replace(reOpenBrackets, "\n$&").replace(reCloseBrackets, "$1\n$2")
            + mToProcess[3];
          continue;
        }
      }
      return lines.join("\n");
    }
  });

  function localModeAt(cm, pos) {
    return CodeMirror.innerMode(cm.getMode(), cm.getTokenAt(pos).state).mode;
  }

  function enumerateModesBetween(cm, line, start, end) {
    var outer = cm.getMode(), text = cm.getLine(line);
    if (end == null) end = text.length;
    if (!outer.innerMode) return [{from: start, to: end, mode: outer}];
    var state = cm.getTokenAt({line: line, ch: start}).state;
    var mode = CodeMirror.innerMode(outer, state).mode;
    var found = [], stream = new CodeMirror.StringStream(text);
    stream.pos = stream.start = start;
    for (;;) {
      outer.token(stream, state);
      var curMode = CodeMirror.innerMode(outer, state).mode;
      if (curMode != mode) {
        var cut = stream.start;
        // Crappy heuristic to deal with the fact that a change in
        // mode can occur both at the end and the start of a token,
        // and we don't know which it was.
        if (mode.name == "xml" && text.charAt(stream.pos - 1) == ">") cut = stream.pos;
        found.push({from: start, to: cut, mode: mode});
        start = cut;
        mode = curMode;
      }
      if (stream.pos >= end) break;
      stream.start = stream.pos;
    }
    if (start < end) found.push({from: start, to: end, mode: mode});
    return found;
  }

  // Comment/uncomment the specified range
  CodeMirror.defineExtension("commentRange", function (isComment, from, to) {
    var curMode = localModeAt(this, from), cm = this;
    this.operation(function() {
      if (isComment) { // Comment range
        cm.replaceRange(curMode.commentEnd, to);
        cm.replaceRange(curMode.commentStart, from);
        if (from.line == to.line && from.ch == to.ch) // An empty comment inserted - put cursor inside
          cm.setCursor(from.line, from.ch + curMode.commentStart.length);
      } else { // Uncomment range
        var selText = cm.getRange(from, to);
        var startIndex = selText.indexOf(curMode.commentStart);
        var endIndex = selText.lastIndexOf(curMode.commentEnd);
        if (startIndex > -1 && endIndex > -1 && endIndex > startIndex) {
          // Take string till comment start
          selText = selText.substr(0, startIndex)
          // From comment start till comment end
            + selText.substring(startIndex + curMode.commentStart.length, endIndex)
          // From comment end till string end
            + selText.substr(endIndex + curMode.commentEnd.length);
        }
        cm.replaceRange(selText, from, to);
      }
    });
  });

  // Applies automatic mode-aware indentation to the specified range
  CodeMirror.defineExtension("autoIndentRange", function (from, to) {
    var cmInstance = this;
    this.operation(function () {
      for (var i = from.line; i <= to.line; i++) {
        cmInstance.indentLine(i, "smart");
      }
    });
  });

  // Applies automatic formatting to the specified range
  CodeMirror.defineExtension("autoFormatRange", function (from, to) {
    var cm = this;
    cm.operation(function () {
      for (var cur = from.line, end = to.line; cur <= end; ++cur) {
        var f = {line: cur, ch: cur == from.line ? from.ch : 0};
        var t = {line: cur, ch: cur == end ? to.ch : null};
        var modes = enumerateModesBetween(cm, cur, f.ch, t.ch), mangled = "";
        var text = cm.getRange(f, t);
        for (var i = 0; i < modes.length; ++i) {
          var part = modes.length > 1 ? text.slice(modes[i].from, modes[i].to) : text;
          if (mangled) mangled += "\n";
          if (modes[i].mode.autoFormatLineBreaks) {
            mangled += modes[i].mode.autoFormatLineBreaks(part);
          } else mangled += text;
        }
        if (mangled != text) {
          for (var count = 0, pos = mangled.indexOf("\n"); pos != -1; pos = mangled.indexOf("\n", pos + 1), ++count) {}
          cm.replaceRange(mangled, f, t);
          cur += count;
          end += count;
        }
      }
      for (var cur = from.line + 1; cur <= end; ++cur)
        cm.indentLine(cur, "smart");
      cm.setSelection(from, cm.getCursor(false));
    });
  });
})();

Fronty.CodeEditor = {
	
	isActive: false,
	oldValue: '',
	doc:false,
	codemirror:false,
	
	init: function(doc) {

		if (this.codemirror == false)		
		{
			this.codemirror = CodeMirror.fromTextArea(document.querySelector("#fronty-code-editor textarea"), {
				mode: 'text/html',
				lineNumbers: true,
				autofocus: true,
				lineWrapping: true,
				//viewportMargin:Infinity,
				theme: 'material'
			});
			
			this.isActive = true;
			this.codemirror.getDoc().on("change", function (e, v) { 
				if (v.origin != "setValue")
				delay(Fronty.Builder.setHtml(e.getValue()), 1000);
			});
		}
		
		
		//_self = this;
		Fronty.Builder.frameBody.on("fronty.undo.add fronty.undo.restore", function (e) { Fronty.CodeEditor.setValue(e);});
		//load code when a new url is loaded
		Fronty.Builder.documentFrame.on("load", function (e) { Fronty.CodeEditor.setValue();});

		this.isActive = true;
		this.setValue();

		return this.codemirror;
	},

	setValue: function(value) {
		if (this.isActive == true)
		{
			var scrollInfo = this.codemirror.getScrollInfo();
			this.codemirror.setValue(Fronty.Builder.getHtml());
			this.codemirror.scrollTo(scrollInfo.left, scrollInfo.top);
		}
	},

	destroy: function(element) {
		/*
		//save memory by destroying but lose scroll on editor toggle
		this.codemirror.toTextArea();
		this.codemirror = false;
		*/ 
		this.isActive = false;
	},

	toggle: function() {
		if (this.isActive != true)
		{
			this.isActive = true;
			return this.init();
		}
		this.isActive = false;
		this.destroy();
	}
}