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Merge pull request #10470 from Snuffleupagus/mozcentral-streams

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Try to, completely, avoid loading the `ReadableStream` polyfill in MOZCENTRAL builds
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Tim van der Meij 2019-01-19 21:22:18 +01:00 • committed by GitHub
commit 66acc7397f
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6 changed files with 94 additions and 46 deletions
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12
src/pdf.worker.js vendored
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@ -12,13 +12,17 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* eslint-disable no-unused-vars */
/* eslint-disable no-restricted-globals, no-unused-vars */
'use strict';
var pdfjsVersion = PDFJSDev.eval('BUNDLE_VERSION');
var pdfjsBuild = PDFJSDev.eval('BUNDLE_BUILD');
if (PDFJSDev.test('MOZCENTRAL') && typeof ReadableStream === 'undefined') {
importScripts('./streams_polyfill.js');
}
var pdfjsCoreWorker = require('./core/worker.js');
const pdfjsVersion = PDFJSDev.eval('BUNDLE_VERSION');
const pdfjsBuild = PDFJSDev.eval('BUNDLE_BUILD');
const pdfjsCoreWorker = require('./core/worker.js');
exports.WorkerMessageHandler = pdfjsCoreWorker.WorkerMessageHandler;

41
src/shared/streams_polyfill.js
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@ -14,25 +14,32 @@
*/
/* eslint-disable no-restricted-globals */
let isReadableStreamSupported = false;
if (typeof ReadableStream !== 'undefined') {
// MS Edge may say it has ReadableStream but they are not up to spec yet.
try {
// eslint-disable-next-line no-new
new ReadableStream({
start(controller) {
controller.close();
},
});
isReadableStreamSupported = true;
} catch (e) {
// The ReadableStream constructor cannot be used.
}
}
if (isReadableStreamSupported) {
if (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('MOZCENTRAL')) {
// On the main-thread the `streams_polyfill.js` file is loaded using a
// <script> tag; see `web/viewer-snippet-firefox-extension.html`.
// On the worker-thread the `streams_polyfill.js` file is (conditionally)
// loaded using `importScripts`; see `src/pdf.worker.js`.
exports.ReadableStream = ReadableStream;
} else {
if (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('IMAGE_DECODERS')) {
let isReadableStreamSupported = false;
if (typeof ReadableStream !== 'undefined') {
// MS Edge may say it has ReadableStream but they are not up to spec yet.
try {
// eslint-disable-next-line no-new
new ReadableStream({
start(controller) {
controller.close();
},
});
isReadableStreamSupported = true;
} catch (e) {
// The ReadableStream constructor cannot be used.
}
}
if (isReadableStreamSupported) {
exports.ReadableStream = ReadableStream;
} else if (typeof PDFJSDev !== 'undefined' &&
PDFJSDev.test('IMAGE_DECODERS')) {
class DummyReadableStream {
constructor() {
throw new Error('The current image decoders are synchronous, ' +

49
src/shared/url_polyfill.js
View file

@ -32,32 +32,31 @@ if (typeof PDFJSDev !== 'undefined' && !PDFJSDev.test('GENERIC')) {
if (isURLSupported) {
exports.URL = URL;
} else {
if (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('IMAGE_DECODERS')) {
class DummyURL {
constructor() {
throw new Error('The current image decoders doesn\'t utilize the ' +
'`URL` constructor, hence it shouldn\'t need to be ' +
'polyfilled for the IMAGE_DECODERS build target.');
}
} else if (typeof PDFJSDev !== 'undefined' &&
PDFJSDev.test('IMAGE_DECODERS')) {
class DummyURL {
constructor() {
throw new Error('The current image decoders doesn\'t utilize the ' +
'`URL` constructor, hence it shouldn\'t need to be ' +
'polyfilled for the IMAGE_DECODERS build target.');
}
exports.URL = DummyURL;
} else {
const PolyfillURL = require('../../external/url/url-lib').URL;
// Attempt to copy over the static methods.
const OriginalURL = require('./global_scope').URL;
if (OriginalURL) {
PolyfillURL.createObjectURL = function(blob) {
// IE extension allows a second optional options argument, see
// http://msdn.microsoft.com/en-us/library/ie/hh772302(v=vs.85).aspx
return OriginalURL.createObjectURL.apply(OriginalURL, arguments);
};
PolyfillURL.revokeObjectURL = function(url) {
OriginalURL.revokeObjectURL(url);
};
}
exports.URL = PolyfillURL;
}
exports.URL = DummyURL;
} else {
const PolyfillURL = require('../../external/url/url-lib').URL;
// Attempt to copy over the static methods.
const OriginalURL = require('./global_scope').URL;
if (OriginalURL) {
PolyfillURL.createObjectURL = function(blob) {
// IE extension allows a second optional options argument, see
// http://msdn.microsoft.com/en-us/library/ie/hh772302(v=vs.85).aspx
return OriginalURL.createObjectURL.apply(OriginalURL, arguments);
};
PolyfillURL.revokeObjectURL = function(url) {
OriginalURL.revokeObjectURL(url);
};
}
exports.URL = PolyfillURL;
}
}