The Tor Browser: dom/apps/src/ScriptPreloader.jsm@7e26c7da4463

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this file,

     3  * You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 "use strict";

     7 const Cu = Components.utils;

     8 const Ci = Components.interfaces;

    10 Cu.import("resource://gre/modules/XPCOMUtils.jsm");

    11 Cu.import("resource://gre/modules/Services.jsm");

    12 Cu.import("resource://gre/modules/Promise.jsm");

    14 this.EXPORTED_SYMBOLS = ["ScriptPreloader"];

    16 function debug(aMsg) {

    17   //dump("--*-- ScriptPreloader: " + aMsg + "\n");

    18 }

    20 this.ScriptPreloader = {

    21 #ifdef MOZ_B2G

    22   _enabled: true,

    23 #else

    24   _enabled: false,

    25 #endif

    27   preload: function(aApp, aManifest) {

    28     debug("Preloading " + aApp.origin);

    29     let deferred = Promise.defer();

    31     if (!this._enabled) {

    32       deferred.resolve();

    33       return deferred.promise;

    34     }

    36     if (aManifest.precompile &&

    37         Array.isArray(aManifest.precompile) &&

    38         aManifest.precompile.length > 0) {

    39       let origin = Services.io.newURI(aApp.origin, null, null);

    40       let toLoad = aManifest.precompile.length;

    41       let principal =

    42         Services.scriptSecurityManager

    43                 .getAppCodebasePrincipal(origin, aApp.localId, false);

    45       aManifest.precompile.forEach((aPath) => {

    46         let uri = Services.io.newURI(aPath, null, origin);

    47         debug("Script to compile: " + uri.spec);

    48         try {

    49           Services.scriptloader.precompileScript(uri, principal,

    50             (aSubject, aTopic, aData) => {

    51               let uri = aSubject.QueryInterface(Ci.nsIURI);

    52               debug("Done compiling " + uri.spec);

    54               toLoad--;

    55               if (toLoad == 0) {

    56                 deferred.resolve();

    57               }

    58             });

    59         } catch (e) {

    60           // Resolve the promise if precompileScript throws.

    61           deferred.resolve();

    62         }

    63       });

    64     } else {

    65       // The precompile field is not an array, let the developer know.

    66       // We don't want to have to enable debug for that to show up.

    67       if (aManifest.precompile) {

    68         Cu.reportError("ASM.JS compilation failed: the 'precompile' manifest " +

    69                        "property should be an array of script uris.\n");

    70       }

    71       deferred.resolve();

    72     }

    74     return deferred.promise;

    75   }

    76 }

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