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Update web/compatibility.js

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1) Remove obsolete workarounds
2) Add support comments
This commit is contained in:
Michał Gołębiowski 2014-05-15 17:28:09 +02:00
parent 2a51b735fc
commit 85291dd8da
1 changed files with 37 additions and 111 deletions
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148
web/compatibility.js
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@ -25,9 +25,10 @@ if (typeof PDFJS === 'undefined') {
}
// Checking if the typed arrays are supported
// Support: iOS<6.0 (subarray), IE<10, Android<4.0
(function checkTypedArrayCompatibility() {
if (typeof Uint8Array !== 'undefined') {
// some mobile versions do not support subarray (e.g. safari 5 / iOS)
// Support: iOS<6.0
if (typeof Uint8Array.prototype.subarray === 'undefined') {
Uint8Array.prototype.subarray = function subarray(start, end) {
return new Uint8Array(this.slice(start, end));
@ -37,7 +38,7 @@ if (typeof PDFJS === 'undefined') {
};
}
// some mobile version might not support Float64Array
// Support: Android<4.1
if (typeof Float64Array === 'undefined') {
window.Float64Array = Float32Array;
}
@ -97,26 +98,15 @@ if (typeof PDFJS === 'undefined') {
})();
// URL = URL || webkitURL
// Support: Safari<7, Android 4.2+
(function normalizeURLObject() {
if (!window.URL) {
window.URL = window.webkitURL;
}
})();
// Object.create() ?
(function checkObjectCreateCompatibility() {
if (typeof Object.create !== 'undefined') {
return;
}
Object.create = function objectCreate(proto) {
function Constructor() {}
Constructor.prototype = proto;
return new Constructor();
};
})();
// Object.defineProperty() ?
// Object.defineProperty()?
// Support: Android<4.0, Safari<5.1
(function checkObjectDefinePropertyCompatibility() {
if (typeof Object.defineProperty !== 'undefined') {
var definePropertyPossible = true;
@ -157,78 +147,23 @@ if (typeof PDFJS === 'undefined') {
};
})();
// Object.keys() ?
(function checkObjectKeysCompatibility() {
if (typeof Object.keys !== 'undefined') {
return;
}
Object.keys = function objectKeys(obj) {
var result = [];
for (var i in obj) {
if (obj.hasOwnProperty(i)) {
result.push(i);
}
}
return result;
};
})();
// No readAsArrayBuffer ?
(function checkFileReaderReadAsArrayBuffer() {
if (typeof FileReader === 'undefined') {
return; // FileReader is not implemented
}
var frPrototype = FileReader.prototype;
// Older versions of Firefox might not have readAsArrayBuffer
if ('readAsArrayBuffer' in frPrototype) {
return; // readAsArrayBuffer is implemented
}
Object.defineProperty(frPrototype, 'readAsArrayBuffer', {
value: function fileReaderReadAsArrayBuffer(blob) {
var fileReader = new FileReader();
var originalReader = this;
fileReader.onload = function fileReaderOnload(evt) {
var data = evt.target.result;
var buffer = new ArrayBuffer(data.length);
var uint8Array = new Uint8Array(buffer);
for (var i = 0, ii = data.length; i < ii; i++) {
uint8Array[i] = data.charCodeAt(i);
}
Object.defineProperty(originalReader, 'result', {
value: buffer,
enumerable: true,
writable: false,
configurable: true
});
var event = document.createEvent('HTMLEvents');
event.initEvent('load', false, false);
originalReader.dispatchEvent(event);
};
fileReader.readAsBinaryString(blob);
}
});
})();
// No XMLHttpRequest.response ?
// No XMLHttpRequest#response?
// Support: IE<11, Android <4.0
(function checkXMLHttpRequestResponseCompatibility() {
var xhrPrototype = XMLHttpRequest.prototype;
if (!('overrideMimeType' in xhrPrototype)) {
var xhr = new XMLHttpRequest();
if (!('overrideMimeType' in xhr)) {
// IE10 might have response, but not overrideMimeType
// Support: IE10
Object.defineProperty(xhrPrototype, 'overrideMimeType', {
value: function xmlHttpRequestOverrideMimeType(mimeType) {}
});
}
if ('response' in xhrPrototype ||
'mozResponseArrayBuffer' in xhrPrototype ||
'mozResponse' in xhrPrototype ||
'responseArrayBuffer' in xhrPrototype) {
if ('response' in xhr || 'responseArrayBuffer' in xhr) {
return;
}
// IE9 ?
// Support: IE9
if (typeof VBArray !== 'undefined') {
Object.defineProperty(xhrPrototype, 'response', {
get: function xmlHttpRequestResponseGet() {
@ -243,7 +178,7 @@ if (typeof PDFJS === 'undefined') {
// will be only called to set "arraybuffer"
this.overrideMimeType('text/plain; charset=x-user-defined');
}
if (typeof xhrPrototype.overrideMimeType === 'function') {
if (typeof xhr.overrideMimeType === 'function') {
Object.defineProperty(xhrPrototype, 'responseType',
{ set: responseTypeSetter });
}
@ -260,6 +195,7 @@ if (typeof PDFJS === 'undefined') {
})();
// window.btoa (base64 encode function) ?
// Support: IE<10
(function checkWindowBtoaCompatibility() {
if ('btoa' in window) {
return;
@ -285,7 +221,8 @@ if (typeof PDFJS === 'undefined') {
};
})();
// window.atob (base64 encode function) ?
// window.atob (base64 encode function)?
// Support: IE<10
(function checkWindowAtobCompatibility() {
if ('atob' in window) {
return;
@ -318,7 +255,8 @@ if (typeof PDFJS === 'undefined') {
};
})();
// Function.prototype.bind ?
// Function.prototype.bind?
// Support: Android<4.0, iOS<6.0
(function checkFunctionPrototypeBindCompatibility() {
if (typeof Function.prototype.bind !== 'undefined') {
return;
@ -335,6 +273,7 @@ if (typeof PDFJS === 'undefined') {
})();
// HTMLElement dataset property
// Support: IE<11, Safari<5.1, Android<4.0
(function checkDatasetProperty() {
var div = document.createElement('div');
if ('dataset' in div) {
@ -372,6 +311,7 @@ if (typeof PDFJS === 'undefined') {
})();
// HTMLElement classList property
// Support: IE<10, Android<4.0, iOS<5.0
(function checkClassListProperty() {
var div = document.createElement('div');
if ('classList' in div) {
@ -435,6 +375,9 @@ if (typeof PDFJS === 'undefined') {
})();
// Check console compatibility
// In older IE versions the console object is not available
// unless console is open.
// Support: IE<10
(function checkConsoleCompatibility() {
if (!('console' in window)) {
window.console = {
@ -457,6 +400,7 @@ if (typeof PDFJS === 'undefined') {
})();
// Check onclick compatibility in Opera
// Support: Opera<15
(function checkOnClickCompatibility() {
// workaround for reported Opera bug DSK-354448:
// onclick fires on disabled buttons with opaque content
@ -475,6 +419,7 @@ if (typeof PDFJS === 'undefined') {
})();
// 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) {
@ -504,6 +449,7 @@ if (typeof PDFJS === 'undefined') {
// 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;
@ -511,6 +457,7 @@ if (typeof PDFJS === 'undefined') {
// 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);
@ -520,12 +467,18 @@ if (typeof PDFJS === 'undefined') {
})();
// Check if the browser supports manipulation of the history.
// Support: IE<10, Android<4.2
(function checkHistoryManipulation() {
if (!window.history.pushState) {
// 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) {
PDFJS.disableHistory = true;
}
})();
// TODO CanvasPixelArray is deprecated; use Uint8ClampedArray
// once it's supported.
(function checkSetPresenceInImageData() {
if (window.CanvasPixelArray) {
if (typeof window.CanvasPixelArray.prototype.set !== 'function') {
@ -538,39 +491,12 @@ if (typeof PDFJS === 'undefined') {
}
})();
(function checkStorages() {
// Feature test as per http://diveintohtml5.info/storage.html
// The additional localStorage call is to get around a FF quirk, see
// bug #495747 in bugzilla
try {
if ('localStorage' in window && window['localStorage'] !== null) {
return;
}
} catch (e) { }
// When the generic viewer is used in Firefox the following code will fail
// when the preference 'network.cookie.lifetimePolicy' is set to 1,
// see Mozilla bug 365772.
try {
window.localStorage = {
data: Object.create(null),
getItem: function (key) {
return this.data[key];
},
setItem: function (key, value) {
this.data[key] = value;
}
};
} catch (e) {
console.log('Unable to create polyfill for localStorage');
}
})();
// Support: IE<10, Android<4.0, iOS<5.0
(function checkRequestAnimationFrame() {
if ('requestAnimationFrame' in window) {
return;
}
window.requestAnimationFrame =
window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame ||
window.requestAnimationFrame = window.webkitRequestAnimationFrame ||
(function fakeRequestAnimationFrame(callback) {
window.setTimeout(callback, 20);
});