compatibility.js in pdfjs_viewer-rails-0.1.0

- old
+ new

@@ -10,14 +10,30 @@
  * 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.
  */
+/* eslint strict: ["error", "function"] */
+/* eslint-disable no-extend-native */
 /* globals VBArray, PDFJS */
 
-'use strict';
+(function compatibilityWrapper() {
+  'use strict';
 
+var userAgent = navigator.userAgent;
+
+var isAndroid = /Android/.test(userAgent);
+var isAndroidPre3 = /Android\s[0-2][^\d]/.test(userAgent);
+var isAndroidPre5 = /Android\s[0-4][^\d]/.test(userAgent);
+var isChrome = userAgent.indexOf('Chrom') >= 0;
+var isChromeWithRangeBug = /Chrome\/(39|40)\./.test(userAgent);
+var isIE = userAgent.indexOf('Trident') >= 0;
+var isIOS = /\b(iPad|iPhone|iPod)(?=;)/.test(userAgent);
+var isOpera = userAgent.indexOf('Opera') >= 0;
+var isSafari = /Safari\//.test(userAgent) &&
+               !/(Chrome\/|Android\s)/.test(userAgent);
+
 // Initializing PDFJS global object here, it case if we need to change/disable
 // some PDF.js features, e.g. range requests
 if (typeof PDFJS === 'undefined') {
   (typeof window !== 'undefined' ? window : this).PDFJS = {};
 }
@@ -26,16 +42,16 @@
 // Support: iOS<6.0 (subarray), IE<10, Android<4.0
 (function checkTypedArrayCompatibility() {
   if (typeof Uint8Array !== 'undefined') {
     // Support: iOS<6.0
     if (typeof Uint8Array.prototype.subarray === 'undefined') {
-        Uint8Array.prototype.subarray = function subarray(start, end) {
-          return new Uint8Array(this.slice(start, end));
-        };
-        Float32Array.prototype.subarray = function subarray(start, end) {
-          return new Float32Array(this.slice(start, end));
-        };
+      Uint8Array.prototype.subarray = function subarray(start, end) {
+        return new Uint8Array(this.slice(start, end));
+      };
+      Float32Array.prototype.subarray = function subarray(start, end) {
+        return new Float32Array(this.slice(start, end));
+      };
     }
 
     // Support: Android<4.1
     if (typeof Float64Array === 'undefined') {
       window.Float64Array = Float32Array;
@@ -184,13 +200,12 @@
   if (typeof VBArray !== 'undefined') {
     Object.defineProperty(xhrPrototype, 'response', {
       get: function xmlHttpRequestResponseGet() {
         if (this.responseType === 'arraybuffer') {
           return new Uint8Array(new VBArray(this.responseBody).toArray());
-        } else {
-          return this.responseText;
         }
+        return this.responseText;
       }
     });
     return;
   }
 
@@ -254,11 +269,11 @@
     }
     for (
       // initialize result and counters
       var bc = 0, bs, buffer, idx = 0, output = '';
       // get next character
-      buffer = input.charAt(idx++);
+      (buffer = input.charAt(idx++));
       // character found in table?
       // initialize bit storage and add its ascii value
       ~buffer && (bs = bc % 4 ? bs * 64 + buffer : buffer,
         // and if not first of each 4 characters,
         // convert the first 8 bits to one ascii character
@@ -426,21 +441,21 @@
     }
   }
   function isDisabled(node) {
     return node.disabled || (node.parentNode && isDisabled(node.parentNode));
   }
-  if (navigator.userAgent.indexOf('Opera') !== -1) {
+  if (isOpera) {
     // use browser detection since we cannot feature-check this bug
     document.addEventListener('click', ignoreIfTargetDisabled, true);
   }
 })();
 
 // Checks if possible to use URL.createObjectURL()
 // Support: IE
 (function checkOnBlobSupport() {
   // sometimes IE loosing the data created with createObjectURL(), see #3977
-  if (navigator.userAgent.indexOf('Trident') >= 0) {
+  if (isIE) {
     PDFJS.disableCreateObjectURL = true;
   }
 })();
 
 // Checks if navigator.language is supported
@@ -449,30 +464,23 @@
     return;
   }
   PDFJS.locale = navigator.userLanguage || 'en-US';
 })();
 
+// Support: Safari 6.0+, Android<3.0, Chrome 39/40, iOS
 (function checkRangeRequests() {
   // Safari has issues with cached range requests see:
   // https://github.com/mozilla/pdf.js/issues/3260
   // Last tested with version 6.0.4.
-  // Support: Safari 6.0+
-  var isSafari = Object.prototype.toString.call(
-                  window.HTMLElement).indexOf('Constructor') > 0;
 
   // Older versions of Android (pre 3.0) has issues with range requests, see:
   // https://github.com/mozilla/pdf.js/issues/3381.
   // Make sure that we only match webkit-based Android browsers,
   // since Firefox/Fennec works as expected.
-  // Support: Android<3.0
-  var regex = /Android\s[0-2][^\d]/;
-  var isOldAndroid = regex.test(navigator.userAgent);
 
   // Range requests are broken in Chrome 39 and 40, https://crbug.com/442318
-  var isChromeWithRangeBug = /Chrome\/(39|40)\./.test(navigator.userAgent);
-
-  if (isSafari || isOldAndroid || isChromeWithRangeBug) {
+  if (isSafari || isAndroidPre3 || isChromeWithRangeBug || isIOS) {
     PDFJS.disableRange = true;
     PDFJS.disableStream = true;
   }
 })();
 
@@ -480,11 +488,11 @@
 // Support: IE<10, Android<4.2
 (function checkHistoryManipulation() {
   // Android 2.x has so buggy pushState support that it was removed in
   // Android 3.0 and restored as late as in Android 4.2.
   // Support: Android 2.x
-  if (!history.pushState || navigator.userAgent.indexOf('Android 2.') >= 0) {
+  if (!history.pushState || isAndroidPre3) {
     PDFJS.disableHistory = true;
   }
 })();
 
 // Support: IE<11, Chrome<21, Android<4.4, Safari<6
@@ -500,21 +508,21 @@
     }
   } else {
     // Old Chrome and Android use an inaccessible CanvasPixelArray prototype.
     // Because we cannot feature detect it, we rely on user agent parsing.
     var polyfill = false, versionMatch;
-    if (navigator.userAgent.indexOf('Chrom') >= 0) {
-      versionMatch = navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./);
+    if (isChrome) {
+      versionMatch = userAgent.match(/Chrom(e|ium)\/([0-9]+)\./);
       // Chrome < 21 lacks the set function.
       polyfill = versionMatch && parseInt(versionMatch[2]) < 21;
-    } else if (navigator.userAgent.indexOf('Android') >= 0) {
+    } else if (isAndroid) {
       // Android < 4.4 lacks the set function.
       // Android >= 4.4 will contain Chrome in the user agent,
       // thus pass the Chrome check above and not reach this block.
-      polyfill = /Android\s[0-4][^\d]/g.test(navigator.userAgent);
-    } else if (navigator.userAgent.indexOf('Safari') >= 0) {
-      versionMatch = navigator.userAgent.
+      polyfill = isAndroidPre5;
+    } else if (isSafari) {
+      versionMatch = userAgent.
         match(/Version\/([0-9]+)\.([0-9]+)\.([0-9]+) Safari\//);
       // Safari < 6 lacks the set function.
       polyfill = versionMatch && parseInt(versionMatch[1]) < 6;
     }
 
@@ -540,11 +548,10 @@
 (function checkRequestAnimationFrame() {
   function fakeRequestAnimationFrame(callback) {
     window.setTimeout(callback, 20);
   }
 
-  var isIOS = /(iPad|iPhone|iPod)/g.test(navigator.userAgent);
   if (isIOS) {
     // requestAnimationFrame on iOS is broken, replacing with fake one.
     window.requestAnimationFrame = fakeRequestAnimationFrame;
     return;
   }
@@ -555,25 +562,22 @@
     window.mozRequestAnimationFrame ||
     window.webkitRequestAnimationFrame ||
     fakeRequestAnimationFrame;
 })();
 
+// Support: Android, iOS
 (function checkCanvasSizeLimitation() {
-  var isIOS = /(iPad|iPhone|iPod)/g.test(navigator.userAgent);
-  var isAndroid = /Android/g.test(navigator.userAgent);
   if (isIOS || isAndroid) {
     // 5MP
     PDFJS.maxCanvasPixels = 5242880;
   }
 })();
 
 // Disable fullscreen support for certain problematic configurations.
 // Support: IE11+ (when embedded).
 (function checkFullscreenSupport() {
-  var isEmbeddedIE = (navigator.userAgent.indexOf('Trident') >= 0 &&
-                      window.parent !== window);
-  if (isEmbeddedIE) {
+  if (isIE && window.parent !== window) {
     PDFJS.disableFullscreen = true;
   }
 })();
 
 // Provides document.currentScript support
@@ -589,5 +593,47 @@
     },
     enumerable: true,
     configurable: true
   });
 })();
+
+// Provides `input.type = 'type'` runtime failure protection.
+// Support: IE9,10.
+(function checkInputTypeNumberAssign() {
+  var el = document.createElement('input');
+  try {
+    el.type = 'number';
+  } catch (ex) {
+    var inputProto = el.constructor.prototype;
+    var typeProperty = Object.getOwnPropertyDescriptor(inputProto, 'type');
+    Object.defineProperty(inputProto, 'type', {
+      get: function () { return typeProperty.get.call(this); },
+      set: function (value) {
+        typeProperty.set.call(this, value === 'number' ? 'text' : value);
+      },
+      enumerable: true,
+      configurable: true
+    });
+  }
+})();
+
+// Provides correct document.readyState value for legacy browsers.
+// Support: IE9,10.
+(function checkDocumentReadyState() {
+  if (!document.attachEvent) {
+    return;
+  }
+  var documentProto = document.constructor.prototype;
+  var readyStateProto = Object.getOwnPropertyDescriptor(documentProto,
+                                                        'readyState');
+  Object.defineProperty(documentProto, 'readyState', {
+    get: function () {
+      var value = readyStateProto.get.call(this);
+      return value === 'interactive' ? 'loading' : value;
+    },
+    set: function (value) { readyStateProto.set.call(this, value); },
+    enumerable: true,
+    configurable: true
+  });
+})();
+
+}).call((typeof window === 'undefined') ? this : window);