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- 'use strict';
- //This file contains the ES6 extensions to the core Promises/A+ API
- var Promise = require('./core.js');
- module.exports = Promise;
- /* Static Functions */
- var TRUE = valuePromise(true);
- var FALSE = valuePromise(false);
- var NULL = valuePromise(null);
- var UNDEFINED = valuePromise(undefined);
- var ZERO = valuePromise(0);
- var EMPTYSTRING = valuePromise('');
- function valuePromise(value) {
- var p = new Promise(Promise._n);
- p._i = 1;
- p._j = value;
- return p;
- }
- Promise.resolve = function (value) {
- if (value instanceof Promise) return value;
- if (value === null) return NULL;
- if (value === undefined) return UNDEFINED;
- if (value === true) return TRUE;
- if (value === false) return FALSE;
- if (value === 0) return ZERO;
- if (value === '') return EMPTYSTRING;
- if (typeof value === 'object' || typeof value === 'function') {
- try {
- var then = value.then;
- if (typeof then === 'function') {
- return new Promise(then.bind(value));
- }
- } catch (ex) {
- return new Promise(function (resolve, reject) {
- reject(ex);
- });
- }
- }
- return valuePromise(value);
- };
- Promise.all = function (arr) {
- var args = Array.prototype.slice.call(arr);
- return new Promise(function (resolve, reject) {
- if (args.length === 0) return resolve([]);
- var remaining = args.length;
- function res(i, val) {
- if (val && (typeof val === 'object' || typeof val === 'function')) {
- if (val instanceof Promise && val.then === Promise.prototype.then) {
- while (val._i === 3) {
- val = val._j;
- }
- if (val._i === 1) return res(i, val._j);
- if (val._i === 2) reject(val._j);
- val.then(function (val) {
- res(i, val);
- }, reject);
- return;
- } else {
- var then = val.then;
- if (typeof then === 'function') {
- var p = new Promise(then.bind(val));
- p.then(function (val) {
- res(i, val);
- }, reject);
- return;
- }
- }
- }
- args[i] = val;
- if (--remaining === 0) {
- resolve(args);
- }
- }
- for (var i = 0; i < args.length; i++) {
- res(i, args[i]);
- }
- });
- };
- Promise.reject = function (value) {
- return new Promise(function (resolve, reject) {
- reject(value);
- });
- };
- Promise.race = function (values) {
- return new Promise(function (resolve, reject) {
- values.forEach(function(value){
- Promise.resolve(value).then(resolve, reject);
- });
- });
- };
- /* Prototype Methods */
- Promise.prototype['catch'] = function (onRejected) {
- return this.then(null, onRejected);
- };
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