The Tor Browser: addon-sdk/source/lib/sdk/core/promise.js@6474c204b198 (annotated)

addon-sdk/source/lib/sdk/core/promise.js@6474c204b198 (annotated)

addon-sdk/source/lib/sdk/core/promise.js

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 'use strict';
 /*
  * Uses `Promise.jsm` as a core implementation, with additional sugar
  * from previous implementation, with inspiration from `Q` and `when`
  *
  * https://developer.mozilla.org/en-US/docs/Mozilla/JavaScript_code_modules/Promise.jsm
  * https://github.com/cujojs/when
  * https://github.com/kriskowal/q
  */
 const PROMISE_URI = 'resource://gre/modules/Promise.jsm';
 getEnvironment.call(this, function ({ require, exports, module, Cu }) {
 const { defer, resolve, all, reject, race } = Cu.import(PROMISE_URI, {}).Promise;
 module.metadata = {
   'stability': 'unstable'
 };
 let promised = (function() {
   // Note: Define shortcuts and utility functions here in order to avoid
   // slower property accesses and unnecessary closure creations on each
   // call of this popular function.
   var call = Function.call;
   var concat = Array.prototype.concat;
   // Utility function that does following:
   // execute([ f, self, args...]) => f.apply(self, args)
   function execute (args) call.apply(call, args)
   // Utility function that takes promise of `a` array and maybe promise `b`
   // as arguments and returns promise for `a.concat(b)`.
   function promisedConcat(promises, unknown) {
     return promises.then(function (values) {
       return resolve(unknown)
         .then(function (value) values.concat([value]));
     });
   }
   return function promised(f, prototype) {
     /**
     Returns a wrapped `f`, which when called returns a promise that resolves to
     `f(...)` passing all the given arguments to it, which by the way may be
     promises. Optionally second `prototype` argument may be provided to be used
     a prototype for a returned promise.
     ## Example
     var promise = promised(Array)(1, promise(2), promise(3))
     promise.then(console.log) // => [ 1, 2, 3 ]
     **/
     return function promised() {
       // create array of [ f, this, args... ]
       return concat.apply([ f, this ], arguments).
         // reduce it via `promisedConcat` to get promised array of fulfillments
         reduce(promisedConcat, resolve([], prototype)).
         // finally map that to promise of `f.apply(this, args...)`
         then(execute);
     };
   };
 })();
 exports.promised = promised;
 exports.all = all;
 exports.defer = defer;
 exports.resolve = resolve;
 exports.reject = reject;
 exports.race = race;
 exports.Promise = Promise;
 });
 function getEnvironment (callback) {
   let Cu, _exports, _module, _require;
   // CommonJS / SDK
   if (typeof(require) === 'function') {
     Cu = require('chrome').Cu;
     _exports = exports;
     _module = module;
     _require = require;
   }
   // JSM
   else if (String(this).indexOf('BackstagePass') >= 0) {
     Cu = this['Components'].utils;
     _exports = this.Promise = {};
     _module = { uri: __URI__, id: 'promise/core' };
     _require = uri => {
       let imports = {};
       Cu.import(uri, imports);
       return imports;
     };
     this.EXPORTED_SYMBOLS = ['Promise'];
   // mozIJSSubScriptLoader.loadSubscript
   } else if (~String(this).indexOf('Sandbox')) {
     Cu = this['Components'].utils;
     _exports = this;
     _module = { id: 'promise/core' };
     _require = uri => {};
   }
   callback({
     Cu: Cu,
     exports: _exports,
     module: _module,
     require: _require
   });
 }