var slice = [].slice;
var hasProp = {}.hasOwnProperty;

if (this.Utils == null) {
  this.Utils = {
    modules: []
  };
}

var addClass = function(element, name) {
  removeClass(element, name);
  return element.className += " " + name + " ";
};

var removeClass = function(element, name) {
  var regExp = new RegExp("(\\s|^)" + name + "(\\s|$)", "gi");
  return element.className = element.className.replace(regExp, "");
};

var hasClass = function(element, name) {
  return new RegExp("(^| )" + name + "( |$)", "gi").test(element.className);
};

var merge = function() {
  var extension;
  var i;
  var len;
  var property;
  var target = arguments[0];
  var extensions = 2 <= arguments.length ? slice.call(arguments, 1) : [];

  for (i = 0, len = extensions.length; i < len; i++) {
    extension = extensions[i];
    for (property in extension) {
      if (!hasProp.call(extension, property)) continue;
      target[property] = extension[property];
    }
  }

  return target;
};

var setOptions = function(options, defaults) {
  return merge({}, defaults, options);
};

var deleteUndefined = function(obj) {
  var key;
  var value;
  var results = [];
  for (key in obj) {
    value = obj[key];
    if (value === null || value === void 0) {
      results.push(delete obj[key]);
    } else {
      results.push(void 0);
    }
  }

  return results;
};

var transformKey = (function() {
  var i;
  var key;
  var len;
  var el = document.createElement("div");
  var transforms = ["transform", "webkitTransform", "OTransform", "MozTransform", "msTransform"];
  for (i = 0, len = transforms.length; i < len; i++) {
    key = transforms[i];
    if (el.style[key] !== void 0) {
      return key;
    }
  }
})();

var requestAnimationFrame = (function(window) {
  var i;
  var len;
  var vendor;
  var ref =  ["ms", "moz", "webkit", "o"];

  for (i = 0, len = ref.length; i < len; i++) {
    vendor = ref[i];
    if (window.requestAnimationFrame) {
      break;
    }

    window.requestAnimationFrame = window[vendor + "RequestAnimationFrame"];
  }

  return window.requestAnimationFrame || (window.requestAnimationFrame = function(callback) {
    return setTimeout(callback, 1000 / 60);
  });
})(window);

this.Utils = {
  addClass: addClass,
  removeClass: removeClass,
  hasClass: hasClass,
  merge: merge,
  setOptions: setOptions,
  deleteUndefined: deleteUndefined,
  transformKey: transformKey,
  requestAnimationFrame: requestAnimationFrame
};