1910 lines
57 KiB
JavaScript
1910 lines
57 KiB
JavaScript
// vim:ts=4:sts=4:sw=4:
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/*!
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*
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* Copyright 2009-2012 Kris Kowal under the terms of the MIT
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* license found at http://github.com/kriskowal/q/raw/master/LICENSE
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*
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* With parts by Tyler Close
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* Copyright 2007-2009 Tyler Close under the terms of the MIT X license found
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* at http://www.opensource.org/licenses/mit-license.html
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* Forked at ref_send.js version: 2009-05-11
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*
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* With parts by Mark Miller
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* Copyright (C) 2011 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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(function (definition) {
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// Turn off strict mode for this function so we can assign to global.Q
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/* jshint strict: false */
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// This file will function properly as a <script> tag, or a module
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// using CommonJS and NodeJS or RequireJS module formats. In
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// Common/Node/RequireJS, the module exports the Q API and when
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// executed as a simple <script>, it creates a Q global instead.
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// Montage Require
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if (typeof bootstrap === "function") {
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bootstrap("promise", definition);
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// CommonJS
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} else if (typeof exports === "object" && typeof module === "object") {
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module.exports = definition();
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// RequireJS
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} else if (typeof define === "function" && define.amd) {
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define(definition);
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// SES (Secure EcmaScript)
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} else if (typeof ses !== "undefined") {
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if (!ses.ok()) {
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return;
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} else {
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ses.makeQ = definition;
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}
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// <script>
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} else {
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Q = definition();
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}
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})(function () {
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"use strict";
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var hasStacks = false;
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try {
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throw new Error();
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} catch (e) {
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hasStacks = !!e.stack;
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}
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// All code after this point will be filtered from stack traces reported
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// by Q.
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var qStartingLine = captureLine();
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var qFileName;
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// shims
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// used for fallback in "allResolved"
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var noop = function () {};
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// Use the fastest possible means to execute a task in a future turn
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// of the event loop.
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var nextTick =(function () {
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// linked list of tasks (single, with head node)
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var head = {task: void 0, next: null};
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var tail = head;
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var flushing = false;
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var requestTick = void 0;
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var isNodeJS = false;
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function flush() {
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/* jshint loopfunc: true */
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while (head.next) {
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head = head.next;
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var task = head.task;
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head.task = void 0;
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var domain = head.domain;
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if (domain) {
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head.domain = void 0;
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domain.enter();
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}
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try {
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task();
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} catch (e) {
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if (isNodeJS) {
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// In node, uncaught exceptions are considered fatal errors.
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// Re-throw them synchronously to interrupt flushing!
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// Ensure continuation if the uncaught exception is suppressed
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// listening "uncaughtException" events (as domains does).
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// Continue in next event to avoid tick recursion.
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if (domain) {
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domain.exit();
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}
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setTimeout(flush, 0);
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if (domain) {
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domain.enter();
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}
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throw e;
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} else {
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// In browsers, uncaught exceptions are not fatal.
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// Re-throw them asynchronously to avoid slow-downs.
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setTimeout(function() {
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throw e;
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}, 0);
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}
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}
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if (domain) {
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domain.exit();
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}
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}
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flushing = false;
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}
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nextTick = function (task) {
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tail = tail.next = {
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task: task,
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domain: isNodeJS && process.domain,
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next: null
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};
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if (!flushing) {
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flushing = true;
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requestTick();
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}
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};
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if (typeof process !== "undefined" && process.nextTick) {
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// Node.js before 0.9. Note that some fake-Node environments, like the
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// Mocha test runner, introduce a `process` global without a `nextTick`.
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isNodeJS = true;
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requestTick = function () {
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process.nextTick(flush);
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};
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} else if (typeof setImmediate === "function") {
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// In IE10, Node.js 0.9+, or https://github.com/NobleJS/setImmediate
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if (typeof window !== "undefined") {
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requestTick = setImmediate.bind(window, flush);
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} else {
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requestTick = function () {
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setImmediate(flush);
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};
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}
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} else if (typeof MessageChannel !== "undefined") {
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// modern browsers
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// http://www.nonblocking.io/2011/06/windownexttick.html
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var channel = new MessageChannel();
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// At least Safari Version 6.0.5 (8536.30.1) intermittently cannot create
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// working message ports the first time a page loads.
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channel.port1.onmessage = function () {
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requestTick = requestPortTick;
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channel.port1.onmessage = flush;
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flush();
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};
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var requestPortTick = function () {
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// Opera requires us to provide a message payload, regardless of
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// whether we use it.
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channel.port2.postMessage(0);
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};
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requestTick = function () {
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setTimeout(flush, 0);
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requestPortTick();
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};
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} else {
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// old browsers
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requestTick = function () {
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setTimeout(flush, 0);
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};
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}
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return nextTick;
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})();
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// Attempt to make generics safe in the face of downstream
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// modifications.
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// There is no situation where this is necessary.
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// If you need a security guarantee, these primordials need to be
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// deeply frozen anyway, and if you don’t need a security guarantee,
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// this is just plain paranoid.
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// However, this **might** have the nice side-effect of reducing the size of
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// the minified code by reducing x.call() to merely x()
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// See Mark Miller’s explanation of what this does.
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// http://wiki.ecmascript.org/doku.php?id=conventions:safe_meta_programming
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var call = Function.call;
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function uncurryThis(f) {
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return function () {
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return call.apply(f, arguments);
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};
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}
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// This is equivalent, but slower:
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// uncurryThis = Function_bind.bind(Function_bind.call);
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// http://jsperf.com/uncurrythis
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var array_slice = uncurryThis(Array.prototype.slice);
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var array_reduce = uncurryThis(
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Array.prototype.reduce || function (callback, basis) {
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var index = 0,
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length = this.length;
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// concerning the initial value, if one is not provided
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if (arguments.length === 1) {
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// seek to the first value in the array, accounting
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// for the possibility that is is a sparse array
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do {
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if (index in this) {
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basis = this[index++];
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break;
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}
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if (++index >= length) {
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throw new TypeError();
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}
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} while (1);
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}
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// reduce
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for (; index < length; index++) {
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// account for the possibility that the array is sparse
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if (index in this) {
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basis = callback(basis, this[index], index);
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}
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}
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return basis;
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}
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);
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var array_indexOf = uncurryThis(
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Array.prototype.indexOf || function (value) {
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// not a very good shim, but good enough for our one use of it
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for (var i = 0; i < this.length; i++) {
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if (this[i] === value) {
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return i;
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}
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}
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return -1;
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}
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);
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var array_map = uncurryThis(
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Array.prototype.map || function (callback, thisp) {
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var self = this;
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||
var collect = [];
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array_reduce(self, function (undefined, value, index) {
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collect.push(callback.call(thisp, value, index, self));
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}, void 0);
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return collect;
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}
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);
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var object_create = Object.create || function (prototype) {
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function Type() { }
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||
Type.prototype = prototype;
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||
return new Type();
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};
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var object_hasOwnProperty = uncurryThis(Object.prototype.hasOwnProperty);
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var object_keys = Object.keys || function (object) {
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var keys = [];
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for (var key in object) {
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if (object_hasOwnProperty(object, key)) {
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keys.push(key);
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}
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}
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return keys;
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};
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var object_toString = uncurryThis(Object.prototype.toString);
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function isObject(value) {
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return value === Object(value);
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}
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||
// generator related shims
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||
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// FIXME: Remove this function once ES6 generators are in SpiderMonkey.
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||
function isStopIteration(exception) {
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return (
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object_toString(exception) === "[object StopIteration]" ||
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exception instanceof QReturnValue
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);
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}
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// FIXME: Remove this helper and Q.return once ES6 generators are in
|
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// SpiderMonkey.
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var QReturnValue;
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if (typeof ReturnValue !== "undefined") {
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QReturnValue = ReturnValue;
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} else {
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QReturnValue = function (value) {
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this.value = value;
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};
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}
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// long stack traces
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||
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var STACK_JUMP_SEPARATOR = "From previous event:";
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function makeStackTraceLong(error, promise) {
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||
// If possible, transform the error stack trace by removing Node and Q
|
||
// cruft, then concatenating with the stack trace of `promise`. See #57.
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if (hasStacks &&
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promise.stack &&
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typeof error === "object" &&
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error !== null &&
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error.stack &&
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error.stack.indexOf(STACK_JUMP_SEPARATOR) === -1
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) {
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var stacks = [];
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for (var p = promise; !!p; p = p.source) {
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if (p.stack) {
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stacks.unshift(p.stack);
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}
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}
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||
stacks.unshift(error.stack);
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||
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var concatedStacks = stacks.join("\n" + STACK_JUMP_SEPARATOR + "\n");
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error.stack = filterStackString(concatedStacks);
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}
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}
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|
||
function filterStackString(stackString) {
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||
var lines = stackString.split("\n");
|
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var desiredLines = [];
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for (var i = 0; i < lines.length; ++i) {
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var line = lines[i];
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||
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if (!isInternalFrame(line) && !isNodeFrame(line) && line) {
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desiredLines.push(line);
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||
}
|
||
}
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||
return desiredLines.join("\n");
|
||
}
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||
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||
function isNodeFrame(stackLine) {
|
||
return stackLine.indexOf("(module.js:") !== -1 ||
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||
stackLine.indexOf("(node.js:") !== -1;
|
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}
|
||
|
||
function getFileNameAndLineNumber(stackLine) {
|
||
// Named functions: "at functionName (filename:lineNumber:columnNumber)"
|
||
// In IE10 function name can have spaces ("Anonymous function") O_o
|
||
var attempt1 = /at .+ \((.+):(\d+):(?:\d+)\)$/.exec(stackLine);
|
||
if (attempt1) {
|
||
return [attempt1[1], Number(attempt1[2])];
|
||
}
|
||
|
||
// Anonymous functions: "at filename:lineNumber:columnNumber"
|
||
var attempt2 = /at ([^ ]+):(\d+):(?:\d+)$/.exec(stackLine);
|
||
if (attempt2) {
|
||
return [attempt2[1], Number(attempt2[2])];
|
||
}
|
||
|
||
// Firefox style: "function@filename:lineNumber or @filename:lineNumber"
|
||
var attempt3 = /.*@(.+):(\d+)$/.exec(stackLine);
|
||
if (attempt3) {
|
||
return [attempt3[1], Number(attempt3[2])];
|
||
}
|
||
}
|
||
|
||
function isInternalFrame(stackLine) {
|
||
var fileNameAndLineNumber = getFileNameAndLineNumber(stackLine);
|
||
|
||
if (!fileNameAndLineNumber) {
|
||
return false;
|
||
}
|
||
|
||
var fileName = fileNameAndLineNumber[0];
|
||
var lineNumber = fileNameAndLineNumber[1];
|
||
|
||
return fileName === qFileName &&
|
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lineNumber >= qStartingLine &&
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lineNumber <= qEndingLine;
|
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}
|
||
|
||
// discover own file name and line number range for filtering stack
|
||
// traces
|
||
function captureLine() {
|
||
if (!hasStacks) {
|
||
return;
|
||
}
|
||
|
||
try {
|
||
throw new Error();
|
||
} catch (e) {
|
||
var lines = e.stack.split("\n");
|
||
var firstLine = lines[0].indexOf("@") > 0 ? lines[1] : lines[2];
|
||
var fileNameAndLineNumber = getFileNameAndLineNumber(firstLine);
|
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if (!fileNameAndLineNumber) {
|
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return;
|
||
}
|
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|
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qFileName = fileNameAndLineNumber[0];
|
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return fileNameAndLineNumber[1];
|
||
}
|
||
}
|
||
|
||
function deprecate(callback, name, alternative) {
|
||
return function () {
|
||
if (typeof console !== "undefined" &&
|
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typeof console.warn === "function") {
|
||
console.warn(name + " is deprecated, use " + alternative +
|
||
" instead.", new Error("").stack);
|
||
}
|
||
return callback.apply(callback, arguments);
|
||
};
|
||
}
|
||
|
||
// end of shims
|
||
// beginning of real work
|
||
|
||
/**
|
||
* Constructs a promise for an immediate reference, passes promises through, or
|
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* coerces promises from different systems.
|
||
* @param value immediate reference or promise
|
||
*/
|
||
function Q(value) {
|
||
// If the object is already a Promise, return it directly. This enables
|
||
// the resolve function to both be used to created references from objects,
|
||
// but to tolerably coerce non-promises to promises.
|
||
if (value instanceof Promise) {
|
||
return value;
|
||
}
|
||
|
||
// assimilate thenables
|
||
if (isPromiseAlike(value)) {
|
||
return coerce(value);
|
||
} else {
|
||
return fulfill(value);
|
||
}
|
||
}
|
||
Q.resolve = Q;
|
||
|
||
/**
|
||
* Performs a task in a future turn of the event loop.
|
||
* @param {Function} task
|
||
*/
|
||
Q.nextTick = nextTick;
|
||
|
||
/**
|
||
* Controls whether or not long stack traces will be on
|
||
*/
|
||
Q.longStackSupport = false;
|
||
|
||
/**
|
||
* Constructs a {promise, resolve, reject} object.
|
||
*
|
||
* `resolve` is a callback to invoke with a more resolved value for the
|
||
* promise. To fulfill the promise, invoke `resolve` with any value that is
|
||
* not a thenable. To reject the promise, invoke `resolve` with a rejected
|
||
* thenable, or invoke `reject` with the reason directly. To resolve the
|
||
* promise to another thenable, thus putting it in the same state, invoke
|
||
* `resolve` with that other thenable.
|
||
*/
|
||
Q.defer = defer;
|
||
function defer() {
|
||
// if "messages" is an "Array", that indicates that the promise has not yet
|
||
// been resolved. If it is "undefined", it has been resolved. Each
|
||
// element of the messages array is itself an array of complete arguments to
|
||
// forward to the resolved promise. We coerce the resolution value to a
|
||
// promise using the `resolve` function because it handles both fully
|
||
// non-thenable values and other thenables gracefully.
|
||
var messages = [], progressListeners = [], resolvedPromise;
|
||
|
||
var deferred = object_create(defer.prototype);
|
||
var promise = object_create(Promise.prototype);
|
||
|
||
promise.promiseDispatch = function (resolve, op, operands) {
|
||
var args = array_slice(arguments);
|
||
if (messages) {
|
||
messages.push(args);
|
||
if (op === "when" && operands[1]) { // progress operand
|
||
progressListeners.push(operands[1]);
|
||
}
|
||
} else {
|
||
nextTick(function () {
|
||
resolvedPromise.promiseDispatch.apply(resolvedPromise, args);
|
||
});
|
||
}
|
||
};
|
||
|
||
// XXX deprecated
|
||
promise.valueOf = function () {
|
||
if (messages) {
|
||
return promise;
|
||
}
|
||
var nearerValue = nearer(resolvedPromise);
|
||
if (isPromise(nearerValue)) {
|
||
resolvedPromise = nearerValue; // shorten chain
|
||
}
|
||
return nearerValue;
|
||
};
|
||
|
||
promise.inspect = function () {
|
||
if (!resolvedPromise) {
|
||
return { state: "pending" };
|
||
}
|
||
return resolvedPromise.inspect();
|
||
};
|
||
|
||
if (Q.longStackSupport && hasStacks) {
|
||
try {
|
||
throw new Error();
|
||
} catch (e) {
|
||
// NOTE: don't try to use `Error.captureStackTrace` or transfer the
|
||
// accessor around; that causes memory leaks as per GH-111. Just
|
||
// reify the stack trace as a string ASAP.
|
||
//
|
||
// At the same time, cut off the first line; it's always just
|
||
// "[object Promise]\n", as per the `toString`.
|
||
promise.stack = e.stack.substring(e.stack.indexOf("\n") + 1);
|
||
}
|
||
}
|
||
|
||
// NOTE: we do the checks for `resolvedPromise` in each method, instead of
|
||
// consolidating them into `become`, since otherwise we'd create new
|
||
// promises with the lines `become(whatever(value))`. See e.g. GH-252.
|
||
|
||
function become(newPromise) {
|
||
resolvedPromise = newPromise;
|
||
promise.source = newPromise;
|
||
|
||
array_reduce(messages, function (undefined, message) {
|
||
nextTick(function () {
|
||
newPromise.promiseDispatch.apply(newPromise, message);
|
||
});
|
||
}, void 0);
|
||
|
||
messages = void 0;
|
||
progressListeners = void 0;
|
||
}
|
||
|
||
deferred.promise = promise;
|
||
deferred.resolve = function (value) {
|
||
if (resolvedPromise) {
|
||
return;
|
||
}
|
||
|
||
become(Q(value));
|
||
};
|
||
|
||
deferred.fulfill = function (value) {
|
||
if (resolvedPromise) {
|
||
return;
|
||
}
|
||
|
||
become(fulfill(value));
|
||
};
|
||
deferred.reject = function (reason) {
|
||
if (resolvedPromise) {
|
||
return;
|
||
}
|
||
|
||
become(reject(reason));
|
||
};
|
||
deferred.notify = function (progress) {
|
||
if (resolvedPromise) {
|
||
return;
|
||
}
|
||
|
||
array_reduce(progressListeners, function (undefined, progressListener) {
|
||
nextTick(function () {
|
||
progressListener(progress);
|
||
});
|
||
}, void 0);
|
||
};
|
||
|
||
return deferred;
|
||
}
|
||
|
||
/**
|
||
* Creates a Node-style callback that will resolve or reject the deferred
|
||
* promise.
|
||
* @returns a nodeback
|
||
*/
|
||
defer.prototype.makeNodeResolver = function () {
|
||
var self = this;
|
||
return function (error, value) {
|
||
if (error) {
|
||
self.reject(error);
|
||
} else if (arguments.length > 2) {
|
||
self.resolve(array_slice(arguments, 1));
|
||
} else {
|
||
self.resolve(value);
|
||
}
|
||
};
|
||
};
|
||
|
||
/**
|
||
* @param resolver {Function} a function that returns nothing and accepts
|
||
* the resolve, reject, and notify functions for a deferred.
|
||
* @returns a promise that may be resolved with the given resolve and reject
|
||
* functions, or rejected by a thrown exception in resolver
|
||
*/
|
||
Q.Promise = promise; // ES6
|
||
Q.promise = promise;
|
||
function promise(resolver) {
|
||
if (typeof resolver !== "function") {
|
||
throw new TypeError("resolver must be a function.");
|
||
}
|
||
var deferred = defer();
|
||
try {
|
||
resolver(deferred.resolve, deferred.reject, deferred.notify);
|
||
} catch (reason) {
|
||
deferred.reject(reason);
|
||
}
|
||
return deferred.promise;
|
||
}
|
||
|
||
promise.race = race; // ES6
|
||
promise.all = all; // ES6
|
||
promise.reject = reject; // ES6
|
||
promise.resolve = Q; // ES6
|
||
|
||
// XXX experimental. This method is a way to denote that a local value is
|
||
// serializable and should be immediately dispatched to a remote upon request,
|
||
// instead of passing a reference.
|
||
Q.passByCopy = function (object) {
|
||
//freeze(object);
|
||
//passByCopies.set(object, true);
|
||
return object;
|
||
};
|
||
|
||
Promise.prototype.passByCopy = function () {
|
||
//freeze(object);
|
||
//passByCopies.set(object, true);
|
||
return this;
|
||
};
|
||
|
||
/**
|
||
* If two promises eventually fulfill to the same value, promises that value,
|
||
* but otherwise rejects.
|
||
* @param x {Any*}
|
||
* @param y {Any*}
|
||
* @returns {Any*} a promise for x and y if they are the same, but a rejection
|
||
* otherwise.
|
||
*
|
||
*/
|
||
Q.join = function (x, y) {
|
||
return Q(x).join(y);
|
||
};
|
||
|
||
Promise.prototype.join = function (that) {
|
||
return Q([this, that]).spread(function (x, y) {
|
||
if (x === y) {
|
||
// TODO: "===" should be Object.is or equiv
|
||
return x;
|
||
} else {
|
||
throw new Error("Can't join: not the same: " + x + " " + y);
|
||
}
|
||
});
|
||
};
|
||
|
||
/**
|
||
* Returns a promise for the first of an array of promises to become fulfilled.
|
||
* @param answers {Array[Any*]} promises to race
|
||
* @returns {Any*} the first promise to be fulfilled
|
||
*/
|
||
Q.race = race;
|
||
function race(answerPs) {
|
||
return promise(function(resolve, reject) {
|
||
// Switch to this once we can assume at least ES5
|
||
// answerPs.forEach(function(answerP) {
|
||
// Q(answerP).then(resolve, reject);
|
||
// });
|
||
// Use this in the meantime
|
||
for (var i = 0, len = answerPs.length; i < len; i++) {
|
||
Q(answerPs[i]).then(resolve, reject);
|
||
}
|
||
});
|
||
}
|
||
|
||
Promise.prototype.race = function () {
|
||
return this.then(Q.race);
|
||
};
|
||
|
||
/**
|
||
* Constructs a Promise with a promise descriptor object and optional fallback
|
||
* function. The descriptor contains methods like when(rejected), get(name),
|
||
* set(name, value), post(name, args), and delete(name), which all
|
||
* return either a value, a promise for a value, or a rejection. The fallback
|
||
* accepts the operation name, a resolver, and any further arguments that would
|
||
* have been forwarded to the appropriate method above had a method been
|
||
* provided with the proper name. The API makes no guarantees about the nature
|
||
* of the returned object, apart from that it is usable whereever promises are
|
||
* bought and sold.
|
||
*/
|
||
Q.makePromise = Promise;
|
||
function Promise(descriptor, fallback, inspect) {
|
||
if (fallback === void 0) {
|
||
fallback = function (op) {
|
||
return reject(new Error(
|
||
"Promise does not support operation: " + op
|
||
));
|
||
};
|
||
}
|
||
if (inspect === void 0) {
|
||
inspect = function () {
|
||
return {state: "unknown"};
|
||
};
|
||
}
|
||
|
||
var promise = object_create(Promise.prototype);
|
||
|
||
promise.promiseDispatch = function (resolve, op, args) {
|
||
var result;
|
||
try {
|
||
if (descriptor[op]) {
|
||
result = descriptor[op].apply(promise, args);
|
||
} else {
|
||
result = fallback.call(promise, op, args);
|
||
}
|
||
} catch (exception) {
|
||
result = reject(exception);
|
||
}
|
||
if (resolve) {
|
||
resolve(result);
|
||
}
|
||
};
|
||
|
||
promise.inspect = inspect;
|
||
|
||
// XXX deprecated `valueOf` and `exception` support
|
||
if (inspect) {
|
||
var inspected = inspect();
|
||
if (inspected.state === "rejected") {
|
||
promise.exception = inspected.reason;
|
||
}
|
||
|
||
promise.valueOf = function () {
|
||
var inspected = inspect();
|
||
if (inspected.state === "pending" ||
|
||
inspected.state === "rejected") {
|
||
return promise;
|
||
}
|
||
return inspected.value;
|
||
};
|
||
}
|
||
|
||
return promise;
|
||
}
|
||
|
||
Promise.prototype.toString = function () {
|
||
return "[object Promise]";
|
||
};
|
||
|
||
Promise.prototype.then = function (fulfilled, rejected, progressed) {
|
||
var self = this;
|
||
var deferred = defer();
|
||
var done = false; // ensure the untrusted promise makes at most a
|
||
// single call to one of the callbacks
|
||
|
||
function _fulfilled(value) {
|
||
try {
|
||
return typeof fulfilled === "function" ? fulfilled(value) : value;
|
||
} catch (exception) {
|
||
return reject(exception);
|
||
}
|
||
}
|
||
|
||
function _rejected(exception) {
|
||
if (typeof rejected === "function") {
|
||
makeStackTraceLong(exception, self);
|
||
try {
|
||
return rejected(exception);
|
||
} catch (newException) {
|
||
return reject(newException);
|
||
}
|
||
}
|
||
return reject(exception);
|
||
}
|
||
|
||
function _progressed(value) {
|
||
return typeof progressed === "function" ? progressed(value) : value;
|
||
}
|
||
|
||
nextTick(function () {
|
||
self.promiseDispatch(function (value) {
|
||
if (done) {
|
||
return;
|
||
}
|
||
done = true;
|
||
|
||
deferred.resolve(_fulfilled(value));
|
||
}, "when", [function (exception) {
|
||
if (done) {
|
||
return;
|
||
}
|
||
done = true;
|
||
|
||
deferred.resolve(_rejected(exception));
|
||
}]);
|
||
});
|
||
|
||
// Progress propagator need to be attached in the current tick.
|
||
self.promiseDispatch(void 0, "when", [void 0, function (value) {
|
||
var newValue;
|
||
var threw = false;
|
||
try {
|
||
newValue = _progressed(value);
|
||
} catch (e) {
|
||
threw = true;
|
||
if (Q.onerror) {
|
||
Q.onerror(e);
|
||
} else {
|
||
throw e;
|
||
}
|
||
}
|
||
|
||
if (!threw) {
|
||
deferred.notify(newValue);
|
||
}
|
||
}]);
|
||
|
||
return deferred.promise;
|
||
};
|
||
|
||
/**
|
||
* Registers an observer on a promise.
|
||
*
|
||
* Guarantees:
|
||
*
|
||
* 1. that fulfilled and rejected will be called only once.
|
||
* 2. that either the fulfilled callback or the rejected callback will be
|
||
* called, but not both.
|
||
* 3. that fulfilled and rejected will not be called in this turn.
|
||
*
|
||
* @param value promise or immediate reference to observe
|
||
* @param fulfilled function to be called with the fulfilled value
|
||
* @param rejected function to be called with the rejection exception
|
||
* @param progressed function to be called on any progress notifications
|
||
* @return promise for the return value from the invoked callback
|
||
*/
|
||
Q.when = when;
|
||
function when(value, fulfilled, rejected, progressed) {
|
||
return Q(value).then(fulfilled, rejected, progressed);
|
||
}
|
||
|
||
Promise.prototype.thenResolve = function (value) {
|
||
return this.then(function () { return value; });
|
||
};
|
||
|
||
Q.thenResolve = function (promise, value) {
|
||
return Q(promise).thenResolve(value);
|
||
};
|
||
|
||
Promise.prototype.thenReject = function (reason) {
|
||
return this.then(function () { throw reason; });
|
||
};
|
||
|
||
Q.thenReject = function (promise, reason) {
|
||
return Q(promise).thenReject(reason);
|
||
};
|
||
|
||
/**
|
||
* If an object is not a promise, it is as "near" as possible.
|
||
* If a promise is rejected, it is as "near" as possible too.
|
||
* If it’s a fulfilled promise, the fulfillment value is nearer.
|
||
* If it’s a deferred promise and the deferred has been resolved, the
|
||
* resolution is "nearer".
|
||
* @param object
|
||
* @returns most resolved (nearest) form of the object
|
||
*/
|
||
|
||
// XXX should we re-do this?
|
||
Q.nearer = nearer;
|
||
function nearer(value) {
|
||
if (isPromise(value)) {
|
||
var inspected = value.inspect();
|
||
if (inspected.state === "fulfilled") {
|
||
return inspected.value;
|
||
}
|
||
}
|
||
return value;
|
||
}
|
||
|
||
/**
|
||
* @returns whether the given object is a promise.
|
||
* Otherwise it is a fulfilled value.
|
||
*/
|
||
Q.isPromise = isPromise;
|
||
function isPromise(object) {
|
||
return isObject(object) &&
|
||
typeof object.promiseDispatch === "function" &&
|
||
typeof object.inspect === "function";
|
||
}
|
||
|
||
Q.isPromiseAlike = isPromiseAlike;
|
||
function isPromiseAlike(object) {
|
||
return isObject(object) && typeof object.then === "function";
|
||
}
|
||
|
||
/**
|
||
* @returns whether the given object is a pending promise, meaning not
|
||
* fulfilled or rejected.
|
||
*/
|
||
Q.isPending = isPending;
|
||
function isPending(object) {
|
||
return isPromise(object) && object.inspect().state === "pending";
|
||
}
|
||
|
||
Promise.prototype.isPending = function () {
|
||
return this.inspect().state === "pending";
|
||
};
|
||
|
||
/**
|
||
* @returns whether the given object is a value or fulfilled
|
||
* promise.
|
||
*/
|
||
Q.isFulfilled = isFulfilled;
|
||
function isFulfilled(object) {
|
||
return !isPromise(object) || object.inspect().state === "fulfilled";
|
||
}
|
||
|
||
Promise.prototype.isFulfilled = function () {
|
||
return this.inspect().state === "fulfilled";
|
||
};
|
||
|
||
/**
|
||
* @returns whether the given object is a rejected promise.
|
||
*/
|
||
Q.isRejected = isRejected;
|
||
function isRejected(object) {
|
||
return isPromise(object) && object.inspect().state === "rejected";
|
||
}
|
||
|
||
Promise.prototype.isRejected = function () {
|
||
return this.inspect().state === "rejected";
|
||
};
|
||
|
||
//// BEGIN UNHANDLED REJECTION TRACKING
|
||
|
||
// This promise library consumes exceptions thrown in handlers so they can be
|
||
// handled by a subsequent promise. The exceptions get added to this array when
|
||
// they are created, and removed when they are handled. Note that in ES6 or
|
||
// shimmed environments, this would naturally be a `Set`.
|
||
var unhandledReasons = [];
|
||
var unhandledRejections = [];
|
||
var trackUnhandledRejections = true;
|
||
|
||
function resetUnhandledRejections() {
|
||
unhandledReasons.length = 0;
|
||
unhandledRejections.length = 0;
|
||
|
||
if (!trackUnhandledRejections) {
|
||
trackUnhandledRejections = true;
|
||
}
|
||
}
|
||
|
||
function trackRejection(promise, reason) {
|
||
if (!trackUnhandledRejections) {
|
||
return;
|
||
}
|
||
|
||
unhandledRejections.push(promise);
|
||
if (reason && typeof reason.stack !== "undefined") {
|
||
unhandledReasons.push(reason.stack);
|
||
} else {
|
||
unhandledReasons.push("(no stack) " + reason);
|
||
}
|
||
}
|
||
|
||
function untrackRejection(promise) {
|
||
if (!trackUnhandledRejections) {
|
||
return;
|
||
}
|
||
|
||
var at = array_indexOf(unhandledRejections, promise);
|
||
if (at !== -1) {
|
||
unhandledRejections.splice(at, 1);
|
||
unhandledReasons.splice(at, 1);
|
||
}
|
||
}
|
||
|
||
Q.resetUnhandledRejections = resetUnhandledRejections;
|
||
|
||
Q.getUnhandledReasons = function () {
|
||
// Make a copy so that consumers can't interfere with our internal state.
|
||
return unhandledReasons.slice();
|
||
};
|
||
|
||
Q.stopUnhandledRejectionTracking = function () {
|
||
resetUnhandledRejections();
|
||
trackUnhandledRejections = false;
|
||
};
|
||
|
||
resetUnhandledRejections();
|
||
|
||
//// END UNHANDLED REJECTION TRACKING
|
||
|
||
/**
|
||
* Constructs a rejected promise.
|
||
* @param reason value describing the failure
|
||
*/
|
||
Q.reject = reject;
|
||
function reject(reason) {
|
||
var rejection = Promise({
|
||
"when": function (rejected) {
|
||
// note that the error has been handled
|
||
if (rejected) {
|
||
untrackRejection(this);
|
||
}
|
||
return rejected ? rejected(reason) : this;
|
||
}
|
||
}, function fallback() {
|
||
return this;
|
||
}, function inspect() {
|
||
return { state: "rejected", reason: reason };
|
||
});
|
||
|
||
// Note that the reason has not been handled.
|
||
trackRejection(rejection, reason);
|
||
|
||
return rejection;
|
||
}
|
||
|
||
/**
|
||
* Constructs a fulfilled promise for an immediate reference.
|
||
* @param value immediate reference
|
||
*/
|
||
Q.fulfill = fulfill;
|
||
function fulfill(value) {
|
||
return Promise({
|
||
"when": function () {
|
||
return value;
|
||
},
|
||
"get": function (name) {
|
||
return value[name];
|
||
},
|
||
"set": function (name, rhs) {
|
||
value[name] = rhs;
|
||
},
|
||
"delete": function (name) {
|
||
delete value[name];
|
||
},
|
||
"post": function (name, args) {
|
||
// Mark Miller proposes that post with no name should apply a
|
||
// promised function.
|
||
if (name === null || name === void 0) {
|
||
return value.apply(void 0, args);
|
||
} else {
|
||
return value[name].apply(value, args);
|
||
}
|
||
},
|
||
"apply": function (thisp, args) {
|
||
return value.apply(thisp, args);
|
||
},
|
||
"keys": function () {
|
||
return object_keys(value);
|
||
}
|
||
}, void 0, function inspect() {
|
||
return { state: "fulfilled", value: value };
|
||
});
|
||
}
|
||
|
||
/**
|
||
* Converts thenables to Q promises.
|
||
* @param promise thenable promise
|
||
* @returns a Q promise
|
||
*/
|
||
function coerce(promise) {
|
||
var deferred = defer();
|
||
nextTick(function () {
|
||
try {
|
||
promise.then(deferred.resolve, deferred.reject, deferred.notify);
|
||
} catch (exception) {
|
||
deferred.reject(exception);
|
||
}
|
||
});
|
||
return deferred.promise;
|
||
}
|
||
|
||
/**
|
||
* Annotates an object such that it will never be
|
||
* transferred away from this process over any promise
|
||
* communication channel.
|
||
* @param object
|
||
* @returns promise a wrapping of that object that
|
||
* additionally responds to the "isDef" message
|
||
* without a rejection.
|
||
*/
|
||
Q.master = master;
|
||
function master(object) {
|
||
return Promise({
|
||
"isDef": function () {}
|
||
}, function fallback(op, args) {
|
||
return dispatch(object, op, args);
|
||
}, function () {
|
||
return Q(object).inspect();
|
||
});
|
||
}
|
||
|
||
/**
|
||
* Spreads the values of a promised array of arguments into the
|
||
* fulfillment callback.
|
||
* @param fulfilled callback that receives variadic arguments from the
|
||
* promised array
|
||
* @param rejected callback that receives the exception if the promise
|
||
* is rejected.
|
||
* @returns a promise for the return value or thrown exception of
|
||
* either callback.
|
||
*/
|
||
Q.spread = spread;
|
||
function spread(value, fulfilled, rejected) {
|
||
return Q(value).spread(fulfilled, rejected);
|
||
}
|
||
|
||
Promise.prototype.spread = function (fulfilled, rejected) {
|
||
return this.all().then(function (array) {
|
||
return fulfilled.apply(void 0, array);
|
||
}, rejected);
|
||
};
|
||
|
||
/**
|
||
* The async function is a decorator for generator functions, turning
|
||
* them into asynchronous generators. Although generators are only part
|
||
* of the newest ECMAScript 6 drafts, this code does not cause syntax
|
||
* errors in older engines. This code should continue to work and will
|
||
* in fact improve over time as the language improves.
|
||
*
|
||
* ES6 generators are currently part of V8 version 3.19 with the
|
||
* --harmony-generators runtime flag enabled. SpiderMonkey has had them
|
||
* for longer, but under an older Python-inspired form. This function
|
||
* works on both kinds of generators.
|
||
*
|
||
* Decorates a generator function such that:
|
||
* - it may yield promises
|
||
* - execution will continue when that promise is fulfilled
|
||
* - the value of the yield expression will be the fulfilled value
|
||
* - it returns a promise for the return value (when the generator
|
||
* stops iterating)
|
||
* - the decorated function returns a promise for the return value
|
||
* of the generator or the first rejected promise among those
|
||
* yielded.
|
||
* - if an error is thrown in the generator, it propagates through
|
||
* every following yield until it is caught, or until it escapes
|
||
* the generator function altogether, and is translated into a
|
||
* rejection for the promise returned by the decorated generator.
|
||
*/
|
||
Q.async = async;
|
||
function async(makeGenerator) {
|
||
return function () {
|
||
// when verb is "send", arg is a value
|
||
// when verb is "throw", arg is an exception
|
||
function continuer(verb, arg) {
|
||
var result;
|
||
|
||
// Until V8 3.19 / Chromium 29 is released, SpiderMonkey is the only
|
||
// engine that has a deployed base of browsers that support generators.
|
||
// However, SM's generators use the Python-inspired semantics of
|
||
// outdated ES6 drafts. We would like to support ES6, but we'd also
|
||
// like to make it possible to use generators in deployed browsers, so
|
||
// we also support Python-style generators. At some point we can remove
|
||
// this block.
|
||
|
||
if (typeof StopIteration === "undefined") {
|
||
// ES6 Generators
|
||
try {
|
||
result = generator[verb](arg);
|
||
} catch (exception) {
|
||
return reject(exception);
|
||
}
|
||
if (result.done) {
|
||
return Q(result.value);
|
||
} else {
|
||
return when(result.value, callback, errback);
|
||
}
|
||
} else {
|
||
// SpiderMonkey Generators
|
||
// FIXME: Remove this case when SM does ES6 generators.
|
||
try {
|
||
result = generator[verb](arg);
|
||
} catch (exception) {
|
||
if (isStopIteration(exception)) {
|
||
return Q(exception.value);
|
||
} else {
|
||
return reject(exception);
|
||
}
|
||
}
|
||
return when(result, callback, errback);
|
||
}
|
||
}
|
||
var generator = makeGenerator.apply(this, arguments);
|
||
var callback = continuer.bind(continuer, "next");
|
||
var errback = continuer.bind(continuer, "throw");
|
||
return callback();
|
||
};
|
||
}
|
||
|
||
/**
|
||
* The spawn function is a small wrapper around async that immediately
|
||
* calls the generator and also ends the promise chain, so that any
|
||
* unhandled errors are thrown instead of forwarded to the error
|
||
* handler. This is useful because it's extremely common to run
|
||
* generators at the top-level to work with libraries.
|
||
*/
|
||
Q.spawn = spawn;
|
||
function spawn(makeGenerator) {
|
||
Q.done(Q.async(makeGenerator)());
|
||
}
|
||
|
||
// FIXME: Remove this interface once ES6 generators are in SpiderMonkey.
|
||
/**
|
||
* Throws a ReturnValue exception to stop an asynchronous generator.
|
||
*
|
||
* This interface is a stop-gap measure to support generator return
|
||
* values in older Firefox/SpiderMonkey. In browsers that support ES6
|
||
* generators like Chromium 29, just use "return" in your generator
|
||
* functions.
|
||
*
|
||
* @param value the return value for the surrounding generator
|
||
* @throws ReturnValue exception with the value.
|
||
* @example
|
||
* // ES6 style
|
||
* Q.async(function* () {
|
||
* var foo = yield getFooPromise();
|
||
* var bar = yield getBarPromise();
|
||
* return foo + bar;
|
||
* })
|
||
* // Older SpiderMonkey style
|
||
* Q.async(function () {
|
||
* var foo = yield getFooPromise();
|
||
* var bar = yield getBarPromise();
|
||
* Q.return(foo + bar);
|
||
* })
|
||
*/
|
||
Q["return"] = _return;
|
||
function _return(value) {
|
||
throw new QReturnValue(value);
|
||
}
|
||
|
||
/**
|
||
* The promised function decorator ensures that any promise arguments
|
||
* are settled and passed as values (`this` is also settled and passed
|
||
* as a value). It will also ensure that the result of a function is
|
||
* always a promise.
|
||
*
|
||
* @example
|
||
* var add = Q.promised(function (a, b) {
|
||
* return a + b;
|
||
* });
|
||
* add(Q(a), Q(B));
|
||
*
|
||
* @param {function} callback The function to decorate
|
||
* @returns {function} a function that has been decorated.
|
||
*/
|
||
Q.promised = promised;
|
||
function promised(callback) {
|
||
return function () {
|
||
return spread([this, all(arguments)], function (self, args) {
|
||
return callback.apply(self, args);
|
||
});
|
||
};
|
||
}
|
||
|
||
/**
|
||
* sends a message to a value in a future turn
|
||
* @param object* the recipient
|
||
* @param op the name of the message operation, e.g., "when",
|
||
* @param args further arguments to be forwarded to the operation
|
||
* @returns result {Promise} a promise for the result of the operation
|
||
*/
|
||
Q.dispatch = dispatch;
|
||
function dispatch(object, op, args) {
|
||
return Q(object).dispatch(op, args);
|
||
}
|
||
|
||
Promise.prototype.dispatch = function (op, args) {
|
||
var self = this;
|
||
var deferred = defer();
|
||
nextTick(function () {
|
||
self.promiseDispatch(deferred.resolve, op, args);
|
||
});
|
||
return deferred.promise;
|
||
};
|
||
|
||
/**
|
||
* Gets the value of a property in a future turn.
|
||
* @param object promise or immediate reference for target object
|
||
* @param name name of property to get
|
||
* @return promise for the property value
|
||
*/
|
||
Q.get = function (object, key) {
|
||
return Q(object).dispatch("get", [key]);
|
||
};
|
||
|
||
Promise.prototype.get = function (key) {
|
||
return this.dispatch("get", [key]);
|
||
};
|
||
|
||
/**
|
||
* Sets the value of a property in a future turn.
|
||
* @param object promise or immediate reference for object object
|
||
* @param name name of property to set
|
||
* @param value new value of property
|
||
* @return promise for the return value
|
||
*/
|
||
Q.set = function (object, key, value) {
|
||
return Q(object).dispatch("set", [key, value]);
|
||
};
|
||
|
||
Promise.prototype.set = function (key, value) {
|
||
return this.dispatch("set", [key, value]);
|
||
};
|
||
|
||
/**
|
||
* Deletes a property in a future turn.
|
||
* @param object promise or immediate reference for target object
|
||
* @param name name of property to delete
|
||
* @return promise for the return value
|
||
*/
|
||
Q.del = // XXX legacy
|
||
Q["delete"] = function (object, key) {
|
||
return Q(object).dispatch("delete", [key]);
|
||
};
|
||
|
||
Promise.prototype.del = // XXX legacy
|
||
Promise.prototype["delete"] = function (key) {
|
||
return this.dispatch("delete", [key]);
|
||
};
|
||
|
||
/**
|
||
* Invokes a method in a future turn.
|
||
* @param object promise or immediate reference for target object
|
||
* @param name name of method to invoke
|
||
* @param value a value to post, typically an array of
|
||
* invocation arguments for promises that
|
||
* are ultimately backed with `resolve` values,
|
||
* as opposed to those backed with URLs
|
||
* wherein the posted value can be any
|
||
* JSON serializable object.
|
||
* @return promise for the return value
|
||
*/
|
||
// bound locally because it is used by other methods
|
||
Q.mapply = // XXX As proposed by "Redsandro"
|
||
Q.post = function (object, name, args) {
|
||
return Q(object).dispatch("post", [name, args]);
|
||
};
|
||
|
||
Promise.prototype.mapply = // XXX As proposed by "Redsandro"
|
||
Promise.prototype.post = function (name, args) {
|
||
return this.dispatch("post", [name, args]);
|
||
};
|
||
|
||
/**
|
||
* Invokes a method in a future turn.
|
||
* @param object promise or immediate reference for target object
|
||
* @param name name of method to invoke
|
||
* @param ...args array of invocation arguments
|
||
* @return promise for the return value
|
||
*/
|
||
Q.send = // XXX Mark Miller's proposed parlance
|
||
Q.mcall = // XXX As proposed by "Redsandro"
|
||
Q.invoke = function (object, name /*...args*/) {
|
||
return Q(object).dispatch("post", [name, array_slice(arguments, 2)]);
|
||
};
|
||
|
||
Promise.prototype.send = // XXX Mark Miller's proposed parlance
|
||
Promise.prototype.mcall = // XXX As proposed by "Redsandro"
|
||
Promise.prototype.invoke = function (name /*...args*/) {
|
||
return this.dispatch("post", [name, array_slice(arguments, 1)]);
|
||
};
|
||
|
||
/**
|
||
* Applies the promised function in a future turn.
|
||
* @param object promise or immediate reference for target function
|
||
* @param args array of application arguments
|
||
*/
|
||
Q.fapply = function (object, args) {
|
||
return Q(object).dispatch("apply", [void 0, args]);
|
||
};
|
||
|
||
Promise.prototype.fapply = function (args) {
|
||
return this.dispatch("apply", [void 0, args]);
|
||
};
|
||
|
||
/**
|
||
* Calls the promised function in a future turn.
|
||
* @param object promise or immediate reference for target function
|
||
* @param ...args array of application arguments
|
||
*/
|
||
Q["try"] =
|
||
Q.fcall = function (object /* ...args*/) {
|
||
return Q(object).dispatch("apply", [void 0, array_slice(arguments, 1)]);
|
||
};
|
||
|
||
Promise.prototype.fcall = function (/*...args*/) {
|
||
return this.dispatch("apply", [void 0, array_slice(arguments)]);
|
||
};
|
||
|
||
/**
|
||
* Binds the promised function, transforming return values into a fulfilled
|
||
* promise and thrown errors into a rejected one.
|
||
* @param object promise or immediate reference for target function
|
||
* @param ...args array of application arguments
|
||
*/
|
||
Q.fbind = function (object /*...args*/) {
|
||
var promise = Q(object);
|
||
var args = array_slice(arguments, 1);
|
||
return function fbound() {
|
||
return promise.dispatch("apply", [
|
||
this,
|
||
args.concat(array_slice(arguments))
|
||
]);
|
||
};
|
||
};
|
||
Promise.prototype.fbind = function (/*...args*/) {
|
||
var promise = this;
|
||
var args = array_slice(arguments);
|
||
return function fbound() {
|
||
return promise.dispatch("apply", [
|
||
this,
|
||
args.concat(array_slice(arguments))
|
||
]);
|
||
};
|
||
};
|
||
|
||
/**
|
||
* Requests the names of the owned properties of a promised
|
||
* object in a future turn.
|
||
* @param object promise or immediate reference for target object
|
||
* @return promise for the keys of the eventually settled object
|
||
*/
|
||
Q.keys = function (object) {
|
||
return Q(object).dispatch("keys", []);
|
||
};
|
||
|
||
Promise.prototype.keys = function () {
|
||
return this.dispatch("keys", []);
|
||
};
|
||
|
||
/**
|
||
* Turns an array of promises into a promise for an array. If any of
|
||
* the promises gets rejected, the whole array is rejected immediately.
|
||
* @param {Array*} an array (or promise for an array) of values (or
|
||
* promises for values)
|
||
* @returns a promise for an array of the corresponding values
|
||
*/
|
||
// By Mark Miller
|
||
// http://wiki.ecmascript.org/doku.php?id=strawman:concurrency&rev=1308776521#allfulfilled
|
||
Q.all = all;
|
||
function all(promises) {
|
||
return when(promises, function (promises) {
|
||
var countDown = 0;
|
||
var deferred = defer();
|
||
array_reduce(promises, function (undefined, promise, index) {
|
||
var snapshot;
|
||
if (
|
||
isPromise(promise) &&
|
||
(snapshot = promise.inspect()).state === "fulfilled"
|
||
) {
|
||
promises[index] = snapshot.value;
|
||
} else {
|
||
++countDown;
|
||
when(
|
||
promise,
|
||
function (value) {
|
||
promises[index] = value;
|
||
if (--countDown === 0) {
|
||
deferred.resolve(promises);
|
||
}
|
||
},
|
||
deferred.reject,
|
||
function (progress) {
|
||
deferred.notify({ index: index, value: progress });
|
||
}
|
||
);
|
||
}
|
||
}, void 0);
|
||
if (countDown === 0) {
|
||
deferred.resolve(promises);
|
||
}
|
||
return deferred.promise;
|
||
});
|
||
}
|
||
|
||
Promise.prototype.all = function () {
|
||
return all(this);
|
||
};
|
||
|
||
/**
|
||
* Waits for all promises to be settled, either fulfilled or
|
||
* rejected. This is distinct from `all` since that would stop
|
||
* waiting at the first rejection. The promise returned by
|
||
* `allResolved` will never be rejected.
|
||
* @param promises a promise for an array (or an array) of promises
|
||
* (or values)
|
||
* @return a promise for an array of promises
|
||
*/
|
||
Q.allResolved = deprecate(allResolved, "allResolved", "allSettled");
|
||
function allResolved(promises) {
|
||
return when(promises, function (promises) {
|
||
promises = array_map(promises, Q);
|
||
return when(all(array_map(promises, function (promise) {
|
||
return when(promise, noop, noop);
|
||
})), function () {
|
||
return promises;
|
||
});
|
||
});
|
||
}
|
||
|
||
Promise.prototype.allResolved = function () {
|
||
return allResolved(this);
|
||
};
|
||
|
||
/**
|
||
* @see Promise#allSettled
|
||
*/
|
||
Q.allSettled = allSettled;
|
||
function allSettled(promises) {
|
||
return Q(promises).allSettled();
|
||
}
|
||
|
||
/**
|
||
* Turns an array of promises into a promise for an array of their states (as
|
||
* returned by `inspect`) when they have all settled.
|
||
* @param {Array[Any*]} values an array (or promise for an array) of values (or
|
||
* promises for values)
|
||
* @returns {Array[State]} an array of states for the respective values.
|
||
*/
|
||
Promise.prototype.allSettled = function () {
|
||
return this.then(function (promises) {
|
||
return all(array_map(promises, function (promise) {
|
||
promise = Q(promise);
|
||
function regardless() {
|
||
return promise.inspect();
|
||
}
|
||
return promise.then(regardless, regardless);
|
||
}));
|
||
});
|
||
};
|
||
|
||
/**
|
||
* Captures the failure of a promise, giving an oportunity to recover
|
||
* with a callback. If the given promise is fulfilled, the returned
|
||
* promise is fulfilled.
|
||
* @param {Any*} promise for something
|
||
* @param {Function} callback to fulfill the returned promise if the
|
||
* given promise is rejected
|
||
* @returns a promise for the return value of the callback
|
||
*/
|
||
Q.fail = // XXX legacy
|
||
Q["catch"] = function (object, rejected) {
|
||
return Q(object).then(void 0, rejected);
|
||
};
|
||
|
||
Promise.prototype.fail = // XXX legacy
|
||
Promise.prototype["catch"] = function (rejected) {
|
||
return this.then(void 0, rejected);
|
||
};
|
||
|
||
/**
|
||
* Attaches a listener that can respond to progress notifications from a
|
||
* promise's originating deferred. This listener receives the exact arguments
|
||
* passed to ``deferred.notify``.
|
||
* @param {Any*} promise for something
|
||
* @param {Function} callback to receive any progress notifications
|
||
* @returns the given promise, unchanged
|
||
*/
|
||
Q.progress = progress;
|
||
function progress(object, progressed) {
|
||
return Q(object).then(void 0, void 0, progressed);
|
||
}
|
||
|
||
Promise.prototype.progress = function (progressed) {
|
||
return this.then(void 0, void 0, progressed);
|
||
};
|
||
|
||
/**
|
||
* Provides an opportunity to observe the settling of a promise,
|
||
* regardless of whether the promise is fulfilled or rejected. Forwards
|
||
* the resolution to the returned promise when the callback is done.
|
||
* The callback can return a promise to defer completion.
|
||
* @param {Any*} promise
|
||
* @param {Function} callback to observe the resolution of the given
|
||
* promise, takes no arguments.
|
||
* @returns a promise for the resolution of the given promise when
|
||
* ``fin`` is done.
|
||
*/
|
||
Q.fin = // XXX legacy
|
||
Q["finally"] = function (object, callback) {
|
||
return Q(object)["finally"](callback);
|
||
};
|
||
|
||
Promise.prototype.fin = // XXX legacy
|
||
Promise.prototype["finally"] = function (callback) {
|
||
callback = Q(callback);
|
||
return this.then(function (value) {
|
||
return callback.fcall().then(function () {
|
||
return value;
|
||
});
|
||
}, function (reason) {
|
||
// TODO attempt to recycle the rejection with "this".
|
||
return callback.fcall().then(function () {
|
||
throw reason;
|
||
});
|
||
});
|
||
};
|
||
|
||
/**
|
||
* Terminates a chain of promises, forcing rejections to be
|
||
* thrown as exceptions.
|
||
* @param {Any*} promise at the end of a chain of promises
|
||
* @returns nothing
|
||
*/
|
||
Q.done = function (object, fulfilled, rejected, progress) {
|
||
return Q(object).done(fulfilled, rejected, progress);
|
||
};
|
||
|
||
Promise.prototype.done = function (fulfilled, rejected, progress) {
|
||
var onUnhandledError = function (error) {
|
||
// forward to a future turn so that ``when``
|
||
// does not catch it and turn it into a rejection.
|
||
nextTick(function () {
|
||
makeStackTraceLong(error, promise);
|
||
if (Q.onerror) {
|
||
Q.onerror(error);
|
||
} else {
|
||
throw error;
|
||
}
|
||
});
|
||
};
|
||
|
||
// Avoid unnecessary `nextTick`ing via an unnecessary `when`.
|
||
var promise = fulfilled || rejected || progress ?
|
||
this.then(fulfilled, rejected, progress) :
|
||
this;
|
||
|
||
if (typeof process === "object" && process && process.domain) {
|
||
onUnhandledError = process.domain.bind(onUnhandledError);
|
||
}
|
||
|
||
promise.then(void 0, onUnhandledError);
|
||
};
|
||
|
||
/**
|
||
* Causes a promise to be rejected if it does not get fulfilled before
|
||
* some milliseconds time out.
|
||
* @param {Any*} promise
|
||
* @param {Number} milliseconds timeout
|
||
* @param {Any*} custom error message or Error object (optional)
|
||
* @returns a promise for the resolution of the given promise if it is
|
||
* fulfilled before the timeout, otherwise rejected.
|
||
*/
|
||
Q.timeout = function (object, ms, error) {
|
||
return Q(object).timeout(ms, error);
|
||
};
|
||
|
||
Promise.prototype.timeout = function (ms, error) {
|
||
var deferred = defer();
|
||
var timeoutId = setTimeout(function () {
|
||
if (!error || "string" === typeof error) {
|
||
error = new Error(error || "Timed out after " + ms + " ms");
|
||
error.code = "ETIMEDOUT";
|
||
}
|
||
deferred.reject(error);
|
||
}, ms);
|
||
|
||
this.then(function (value) {
|
||
clearTimeout(timeoutId);
|
||
deferred.resolve(value);
|
||
}, function (exception) {
|
||
clearTimeout(timeoutId);
|
||
deferred.reject(exception);
|
||
}, deferred.notify);
|
||
|
||
return deferred.promise;
|
||
};
|
||
|
||
/**
|
||
* Returns a promise for the given value (or promised value), some
|
||
* milliseconds after it resolved. Passes rejections immediately.
|
||
* @param {Any*} promise
|
||
* @param {Number} milliseconds
|
||
* @returns a promise for the resolution of the given promise after milliseconds
|
||
* time has elapsed since the resolution of the given promise.
|
||
* If the given promise rejects, that is passed immediately.
|
||
*/
|
||
Q.delay = function (object, timeout) {
|
||
if (timeout === void 0) {
|
||
timeout = object;
|
||
object = void 0;
|
||
}
|
||
return Q(object).delay(timeout);
|
||
};
|
||
|
||
Promise.prototype.delay = function (timeout) {
|
||
return this.then(function (value) {
|
||
var deferred = defer();
|
||
setTimeout(function () {
|
||
deferred.resolve(value);
|
||
}, timeout);
|
||
return deferred.promise;
|
||
});
|
||
};
|
||
|
||
/**
|
||
* Passes a continuation to a Node function, which is called with the given
|
||
* arguments provided as an array, and returns a promise.
|
||
*
|
||
* Q.nfapply(FS.readFile, [__filename])
|
||
* .then(function (content) {
|
||
* })
|
||
*
|
||
*/
|
||
Q.nfapply = function (callback, args) {
|
||
return Q(callback).nfapply(args);
|
||
};
|
||
|
||
Promise.prototype.nfapply = function (args) {
|
||
var deferred = defer();
|
||
var nodeArgs = array_slice(args);
|
||
nodeArgs.push(deferred.makeNodeResolver());
|
||
this.fapply(nodeArgs).fail(deferred.reject);
|
||
return deferred.promise;
|
||
};
|
||
|
||
/**
|
||
* Passes a continuation to a Node function, which is called with the given
|
||
* arguments provided individually, and returns a promise.
|
||
* @example
|
||
* Q.nfcall(FS.readFile, __filename)
|
||
* .then(function (content) {
|
||
* })
|
||
*
|
||
*/
|
||
Q.nfcall = function (callback /*...args*/) {
|
||
var args = array_slice(arguments, 1);
|
||
return Q(callback).nfapply(args);
|
||
};
|
||
|
||
Promise.prototype.nfcall = function (/*...args*/) {
|
||
var nodeArgs = array_slice(arguments);
|
||
var deferred = defer();
|
||
nodeArgs.push(deferred.makeNodeResolver());
|
||
this.fapply(nodeArgs).fail(deferred.reject);
|
||
return deferred.promise;
|
||
};
|
||
|
||
/**
|
||
* Wraps a NodeJS continuation passing function and returns an equivalent
|
||
* version that returns a promise.
|
||
* @example
|
||
* Q.nfbind(FS.readFile, __filename)("utf-8")
|
||
* .then(console.log)
|
||
* .done()
|
||
*/
|
||
Q.nfbind =
|
||
Q.denodeify = function (callback /*...args*/) {
|
||
var baseArgs = array_slice(arguments, 1);
|
||
return function () {
|
||
var nodeArgs = baseArgs.concat(array_slice(arguments));
|
||
var deferred = defer();
|
||
nodeArgs.push(deferred.makeNodeResolver());
|
||
Q(callback).fapply(nodeArgs).fail(deferred.reject);
|
||
return deferred.promise;
|
||
};
|
||
};
|
||
|
||
Promise.prototype.nfbind =
|
||
Promise.prototype.denodeify = function (/*...args*/) {
|
||
var args = array_slice(arguments);
|
||
args.unshift(this);
|
||
return Q.denodeify.apply(void 0, args);
|
||
};
|
||
|
||
Q.nbind = function (callback, thisp /*...args*/) {
|
||
var baseArgs = array_slice(arguments, 2);
|
||
return function () {
|
||
var nodeArgs = baseArgs.concat(array_slice(arguments));
|
||
var deferred = defer();
|
||
nodeArgs.push(deferred.makeNodeResolver());
|
||
function bound() {
|
||
return callback.apply(thisp, arguments);
|
||
}
|
||
Q(bound).fapply(nodeArgs).fail(deferred.reject);
|
||
return deferred.promise;
|
||
};
|
||
};
|
||
|
||
Promise.prototype.nbind = function (/*thisp, ...args*/) {
|
||
var args = array_slice(arguments, 0);
|
||
args.unshift(this);
|
||
return Q.nbind.apply(void 0, args);
|
||
};
|
||
|
||
/**
|
||
* Calls a method of a Node-style object that accepts a Node-style
|
||
* callback with a given array of arguments, plus a provided callback.
|
||
* @param object an object that has the named method
|
||
* @param {String} name name of the method of object
|
||
* @param {Array} args arguments to pass to the method; the callback
|
||
* will be provided by Q and appended to these arguments.
|
||
* @returns a promise for the value or error
|
||
*/
|
||
Q.nmapply = // XXX As proposed by "Redsandro"
|
||
Q.npost = function (object, name, args) {
|
||
return Q(object).npost(name, args);
|
||
};
|
||
|
||
Promise.prototype.nmapply = // XXX As proposed by "Redsandro"
|
||
Promise.prototype.npost = function (name, args) {
|
||
var nodeArgs = array_slice(args || []);
|
||
var deferred = defer();
|
||
nodeArgs.push(deferred.makeNodeResolver());
|
||
this.dispatch("post", [name, nodeArgs]).fail(deferred.reject);
|
||
return deferred.promise;
|
||
};
|
||
|
||
/**
|
||
* Calls a method of a Node-style object that accepts a Node-style
|
||
* callback, forwarding the given variadic arguments, plus a provided
|
||
* callback argument.
|
||
* @param object an object that has the named method
|
||
* @param {String} name name of the method of object
|
||
* @param ...args arguments to pass to the method; the callback will
|
||
* be provided by Q and appended to these arguments.
|
||
* @returns a promise for the value or error
|
||
*/
|
||
Q.nsend = // XXX Based on Mark Miller's proposed "send"
|
||
Q.nmcall = // XXX Based on "Redsandro's" proposal
|
||
Q.ninvoke = function (object, name /*...args*/) {
|
||
var nodeArgs = array_slice(arguments, 2);
|
||
var deferred = defer();
|
||
nodeArgs.push(deferred.makeNodeResolver());
|
||
Q(object).dispatch("post", [name, nodeArgs]).fail(deferred.reject);
|
||
return deferred.promise;
|
||
};
|
||
|
||
Promise.prototype.nsend = // XXX Based on Mark Miller's proposed "send"
|
||
Promise.prototype.nmcall = // XXX Based on "Redsandro's" proposal
|
||
Promise.prototype.ninvoke = function (name /*...args*/) {
|
||
var nodeArgs = array_slice(arguments, 1);
|
||
var deferred = defer();
|
||
nodeArgs.push(deferred.makeNodeResolver());
|
||
this.dispatch("post", [name, nodeArgs]).fail(deferred.reject);
|
||
return deferred.promise;
|
||
};
|
||
|
||
/**
|
||
* If a function would like to support both Node continuation-passing-style and
|
||
* promise-returning-style, it can end its internal promise chain with
|
||
* `nodeify(nodeback)`, forwarding the optional nodeback argument. If the user
|
||
* elects to use a nodeback, the result will be sent there. If they do not
|
||
* pass a nodeback, they will receive the result promise.
|
||
* @param object a result (or a promise for a result)
|
||
* @param {Function} nodeback a Node.js-style callback
|
||
* @returns either the promise or nothing
|
||
*/
|
||
Q.nodeify = nodeify;
|
||
function nodeify(object, nodeback) {
|
||
return Q(object).nodeify(nodeback);
|
||
}
|
||
|
||
Promise.prototype.nodeify = function (nodeback) {
|
||
if (nodeback) {
|
||
this.then(function (value) {
|
||
nextTick(function () {
|
||
nodeback(null, value);
|
||
});
|
||
}, function (error) {
|
||
nextTick(function () {
|
||
nodeback(error);
|
||
});
|
||
});
|
||
} else {
|
||
return this;
|
||
}
|
||
};
|
||
|
||
// All code before this point will be filtered from stack traces.
|
||
var qEndingLine = captureLine();
|
||
|
||
return Q;
|
||
|
||
});
|
||
|