зеркало из https://github.com/mozilla/gecko-dev.git
77 строки
2.2 KiB
JavaScript
77 строки
2.2 KiB
JavaScript
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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const Cu = Components.utils;
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const Ci = Components.interfaces;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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Cu.import("resource://gre/modules/Services.jsm");
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Cu.import("resource://gre/modules/Promise.jsm");
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this.EXPORTED_SYMBOLS = ["ScriptPreloader"];
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function debug(aMsg) {
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//dump("--*-- ScriptPreloader: " + aMsg + "\n");
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}
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this.ScriptPreloader = {
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#ifdef MOZ_B2G
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_enabled: true,
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#else
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_enabled: false,
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#endif
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preload: function(aApp, aManifest) {
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debug("Preloading " + aApp.origin);
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let deferred = Promise.defer();
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if (!this._enabled) {
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deferred.resolve();
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return deferred.promise;
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}
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if (aManifest.precompile &&
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Array.isArray(aManifest.precompile) &&
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aManifest.precompile.length > 0) {
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let origin = Services.io.newURI(aApp.origin, null, null);
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let toLoad = aManifest.precompile.length;
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let principal =
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Services.scriptSecurityManager
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.getAppCodebasePrincipal(origin, aApp.localId, false);
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aManifest.precompile.forEach((aPath) => {
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let uri = Services.io.newURI(aPath, null, origin);
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debug("Script to compile: " + uri.spec);
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try {
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Services.scriptloader.precompileScript(uri, principal,
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(aSubject, aTopic, aData) => {
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let uri = aSubject.QueryInterface(Ci.nsIURI);
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debug("Done compiling " + uri.spec);
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toLoad--;
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if (toLoad == 0) {
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deferred.resolve();
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}
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});
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} catch (e) {
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// Resolve the promise if precompileScript throws.
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deferred.resolve();
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}
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});
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} else {
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// The precompile field is not an array, let the developer know.
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// We don't want to have to enable debug for that to show up.
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if (aManifest.precompile) {
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Cu.reportError("ASM.JS compilation failed: the 'precompile' manifest " +
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"property should be an array of script uris.\n");
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}
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deferred.resolve();
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}
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return deferred.promise;
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}
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}
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