883 lines
20 KiB
JavaScript
883 lines
20 KiB
JavaScript
/** @license MIT License (c) copyright 2010-2014 original author or authors */
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/** @author Brian Cavalier */
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/** @author John Hann */
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(function(define) { 'use strict';
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define(function() {
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return function makePromise(environment) {
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var tasks = environment.scheduler;
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var objectCreate = Object.create ||
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function(proto) {
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function Child() {}
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Child.prototype = proto;
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return new Child();
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};
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/**
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* Create a promise whose fate is determined by resolver
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* @constructor
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* @returns {Promise} promise
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* @name Promise
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*/
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function Promise(resolver, handler) {
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this._handler = resolver === Handler ? handler : init(resolver);
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}
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/**
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* Run the supplied resolver
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* @param resolver
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* @returns {Pending}
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*/
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function init(resolver) {
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var handler = new Pending();
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try {
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resolver(promiseResolve, promiseReject, promiseNotify);
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} catch (e) {
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promiseReject(e);
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}
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return handler;
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/**
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* Transition from pre-resolution state to post-resolution state, notifying
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* all listeners of the ultimate fulfillment or rejection
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* @param {*} x resolution value
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*/
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function promiseResolve (x) {
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handler.resolve(x);
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}
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/**
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* Reject this promise with reason, which will be used verbatim
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* @param {Error|*} reason rejection reason, strongly suggested
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* to be an Error type
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*/
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function promiseReject (reason) {
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handler.reject(reason);
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}
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/**
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* @deprecated
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* Issue a progress event, notifying all progress listeners
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* @param {*} x progress event payload to pass to all listeners
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*/
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function promiseNotify (x) {
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handler.notify(x);
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}
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}
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// Creation
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Promise.resolve = resolve;
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Promise.reject = reject;
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Promise.never = never;
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Promise._defer = defer;
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Promise._handler = getHandler;
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/**
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* Returns a trusted promise. If x is already a trusted promise, it is
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* returned, otherwise returns a new trusted Promise which follows x.
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* @param {*} x
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* @return {Promise} promise
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*/
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function resolve(x) {
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return isPromise(x) ? x
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: new Promise(Handler, new Async(getHandler(x)));
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}
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/**
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* Return a reject promise with x as its reason (x is used verbatim)
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* @param {*} x
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* @returns {Promise} rejected promise
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*/
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function reject(x) {
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return new Promise(Handler, new Async(new Rejected(x)));
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}
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/**
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* Return a promise that remains pending forever
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* @returns {Promise} forever-pending promise.
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*/
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function never() {
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return foreverPendingPromise; // Should be frozen
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}
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/**
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* Creates an internal {promise, resolver} pair
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* @private
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* @returns {Promise}
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*/
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function defer() {
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return new Promise(Handler, new Pending());
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}
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// Transformation and flow control
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/**
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* Transform this promise's fulfillment value, returning a new Promise
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* for the transformed result. If the promise cannot be fulfilled, onRejected
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* is called with the reason. onProgress *may* be called with updates toward
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* this promise's fulfillment.
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* @param {function=} onFulfilled fulfillment handler
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* @param {function=} onRejected rejection handler
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* @param {function=} onProgress @deprecated progress handler
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* @return {Promise} new promise
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*/
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Promise.prototype.then = function(onFulfilled, onRejected, onProgress) {
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var parent = this._handler;
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var state = parent.join().state();
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if ((typeof onFulfilled !== 'function' && state > 0) ||
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(typeof onRejected !== 'function' && state < 0)) {
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// Short circuit: value will not change, simply share handler
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return new this.constructor(Handler, parent);
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}
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var p = this._beget();
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var child = p._handler;
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parent.chain(child, parent.receiver, onFulfilled, onRejected, onProgress);
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return p;
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};
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/**
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* If this promise cannot be fulfilled due to an error, call onRejected to
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* handle the error. Shortcut for .then(undefined, onRejected)
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* @param {function?} onRejected
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* @return {Promise}
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*/
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Promise.prototype['catch'] = function(onRejected) {
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return this.then(void 0, onRejected);
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};
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/**
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* Creates a new, pending promise of the same type as this promise
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* @private
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* @returns {Promise}
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*/
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Promise.prototype._beget = function() {
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return begetFrom(this._handler, this.constructor);
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};
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function begetFrom(parent, Promise) {
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var child = new Pending(parent.receiver, parent.join().context);
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return new Promise(Handler, child);
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}
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// Array combinators
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Promise.all = all;
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Promise.race = race;
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Promise._traverse = traverse;
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/**
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* Return a promise that will fulfill when all promises in the
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* input array have fulfilled, or will reject when one of the
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* promises rejects.
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* @param {array} promises array of promises
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* @returns {Promise} promise for array of fulfillment values
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*/
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function all(promises) {
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return traverseWith(snd, null, promises);
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}
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/**
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* Array<Promise<X>> -> Promise<Array<f(X)>>
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* @private
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* @param {function} f function to apply to each promise's value
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* @param {Array} promises array of promises
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* @returns {Promise} promise for transformed values
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*/
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function traverse(f, promises) {
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return traverseWith(tryCatch2, f, promises);
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}
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function traverseWith(tryMap, f, promises) {
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var handler = typeof f === 'function' ? mapAt : settleAt;
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var resolver = new Pending();
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var pending = promises.length >>> 0;
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var results = new Array(pending);
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for (var i = 0, x; i < promises.length && !resolver.resolved; ++i) {
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x = promises[i];
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if (x === void 0 && !(i in promises)) {
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--pending;
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continue;
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}
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traverseAt(promises, handler, i, x, resolver);
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}
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if(pending === 0) {
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resolver.become(new Fulfilled(results));
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}
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return new Promise(Handler, resolver);
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function mapAt(i, x, resolver) {
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if(!resolver.resolved) {
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traverseAt(promises, settleAt, i, tryMap(f, x, i), resolver);
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}
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}
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function settleAt(i, x, resolver) {
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results[i] = x;
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if(--pending === 0) {
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resolver.become(new Fulfilled(results));
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}
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}
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}
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function traverseAt(promises, handler, i, x, resolver) {
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if (maybeThenable(x)) {
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var h = getHandlerMaybeThenable(x);
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var s = h.state();
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if (s === 0) {
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h.fold(handler, i, void 0, resolver);
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} else if (s > 0) {
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handler(i, h.value, resolver);
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} else {
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resolver.become(h);
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visitRemaining(promises, i+1, h);
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}
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} else {
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handler(i, x, resolver);
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}
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}
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Promise._visitRemaining = visitRemaining;
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function visitRemaining(promises, start, handler) {
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for(var i=start; i<promises.length; ++i) {
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markAsHandled(getHandler(promises[i]), handler);
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}
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}
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function markAsHandled(h, handler) {
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if(h === handler) {
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return;
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}
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var s = h.state();
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if(s === 0) {
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h.visit(h, void 0, h._unreport);
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} else if(s < 0) {
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h._unreport();
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}
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}
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/**
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* Fulfill-reject competitive race. Return a promise that will settle
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* to the same state as the earliest input promise to settle.
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*
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* WARNING: The ES6 Promise spec requires that race()ing an empty array
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* must return a promise that is pending forever. This implementation
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* returns a singleton forever-pending promise, the same singleton that is
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* returned by Promise.never(), thus can be checked with ===
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*
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* @param {array} promises array of promises to race
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* @returns {Promise} if input is non-empty, a promise that will settle
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* to the same outcome as the earliest input promise to settle. if empty
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* is empty, returns a promise that will never settle.
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*/
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function race(promises) {
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if(typeof promises !== 'object' || promises === null) {
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return reject(new TypeError('non-iterable passed to race()'));
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}
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// Sigh, race([]) is untestable unless we return *something*
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// that is recognizable without calling .then() on it.
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return promises.length === 0 ? never()
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: promises.length === 1 ? resolve(promises[0])
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: runRace(promises);
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}
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function runRace(promises) {
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var resolver = new Pending();
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var i, x, h;
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for(i=0; i<promises.length; ++i) {
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x = promises[i];
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if (x === void 0 && !(i in promises)) {
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continue;
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}
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h = getHandler(x);
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if(h.state() !== 0) {
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resolver.become(h);
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visitRemaining(promises, i+1, h);
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break;
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} else {
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h.visit(resolver, resolver.resolve, resolver.reject);
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}
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}
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return new Promise(Handler, resolver);
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}
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// Promise internals
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// Below this, everything is @private
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/**
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* Get an appropriate handler for x, without checking for cycles
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* @param {*} x
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* @returns {object} handler
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*/
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function getHandler(x) {
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if(isPromise(x)) {
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return x._handler.join();
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}
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return maybeThenable(x) ? getHandlerUntrusted(x) : new Fulfilled(x);
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}
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/**
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* Get a handler for thenable x.
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* NOTE: You must only call this if maybeThenable(x) == true
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* @param {object|function|Promise} x
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* @returns {object} handler
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*/
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function getHandlerMaybeThenable(x) {
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return isPromise(x) ? x._handler.join() : getHandlerUntrusted(x);
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}
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/**
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* Get a handler for potentially untrusted thenable x
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* @param {*} x
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* @returns {object} handler
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*/
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function getHandlerUntrusted(x) {
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try {
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var untrustedThen = x.then;
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return typeof untrustedThen === 'function'
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? new Thenable(untrustedThen, x)
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: new Fulfilled(x);
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} catch(e) {
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return new Rejected(e);
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}
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}
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/**
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* Handler for a promise that is pending forever
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* @constructor
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*/
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function Handler() {}
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Handler.prototype.when
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= Handler.prototype.become
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= Handler.prototype.notify // deprecated
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= Handler.prototype.fail
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= Handler.prototype._unreport
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= Handler.prototype._report
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= noop;
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Handler.prototype._state = 0;
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Handler.prototype.state = function() {
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return this._state;
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};
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/**
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* Recursively collapse handler chain to find the handler
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* nearest to the fully resolved value.
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* @returns {object} handler nearest the fully resolved value
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*/
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Handler.prototype.join = function() {
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var h = this;
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while(h.handler !== void 0) {
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h = h.handler;
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}
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return h;
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};
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Handler.prototype.chain = function(to, receiver, fulfilled, rejected, progress) {
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this.when({
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resolver: to,
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receiver: receiver,
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fulfilled: fulfilled,
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rejected: rejected,
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progress: progress
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});
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};
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Handler.prototype.visit = function(receiver, fulfilled, rejected, progress) {
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this.chain(failIfRejected, receiver, fulfilled, rejected, progress);
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};
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Handler.prototype.fold = function(f, z, c, to) {
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this.when(new Fold(f, z, c, to));
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};
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/**
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* Handler that invokes fail() on any handler it becomes
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* @constructor
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*/
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function FailIfRejected() {}
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inherit(Handler, FailIfRejected);
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FailIfRejected.prototype.become = function(h) {
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h.fail();
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};
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var failIfRejected = new FailIfRejected();
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/**
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* Handler that manages a queue of consumers waiting on a pending promise
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* @constructor
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*/
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function Pending(receiver, inheritedContext) {
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Promise.createContext(this, inheritedContext);
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this.consumers = void 0;
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this.receiver = receiver;
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this.handler = void 0;
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this.resolved = false;
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}
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inherit(Handler, Pending);
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Pending.prototype._state = 0;
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Pending.prototype.resolve = function(x) {
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this.become(getHandler(x));
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};
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Pending.prototype.reject = function(x) {
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if(this.resolved) {
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return;
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}
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this.become(new Rejected(x));
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};
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Pending.prototype.join = function() {
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if (!this.resolved) {
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return this;
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}
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var h = this;
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while (h.handler !== void 0) {
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h = h.handler;
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if (h === this) {
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return this.handler = cycle();
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}
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}
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return h;
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};
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Pending.prototype.run = function() {
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var q = this.consumers;
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var handler = this.join();
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this.consumers = void 0;
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for (var i = 0; i < q.length; ++i) {
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handler.when(q[i]);
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}
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};
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Pending.prototype.become = function(handler) {
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if(this.resolved) {
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return;
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}
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this.resolved = true;
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this.handler = handler;
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if(this.consumers !== void 0) {
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tasks.enqueue(this);
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}
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if(this.context !== void 0) {
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handler._report(this.context);
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}
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};
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Pending.prototype.when = function(continuation) {
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if(this.resolved) {
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tasks.enqueue(new ContinuationTask(continuation, this.handler));
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} else {
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if(this.consumers === void 0) {
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this.consumers = [continuation];
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} else {
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this.consumers.push(continuation);
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}
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}
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};
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/**
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* @deprecated
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*/
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Pending.prototype.notify = function(x) {
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if(!this.resolved) {
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tasks.enqueue(new ProgressTask(x, this));
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}
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};
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Pending.prototype.fail = function(context) {
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var c = typeof context === 'undefined' ? this.context : context;
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this.resolved && this.handler.join().fail(c);
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};
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Pending.prototype._report = function(context) {
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this.resolved && this.handler.join()._report(context);
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};
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Pending.prototype._unreport = function() {
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this.resolved && this.handler.join()._unreport();
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};
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/**
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* Wrap another handler and force it into a future stack
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* @param {object} handler
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* @constructor
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*/
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function Async(handler) {
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this.handler = handler;
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}
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inherit(Handler, Async);
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Async.prototype.when = function(continuation) {
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tasks.enqueue(new ContinuationTask(continuation, this));
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};
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Async.prototype._report = function(context) {
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this.join()._report(context);
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};
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Async.prototype._unreport = function() {
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this.join()._unreport();
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};
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/**
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* Handler that wraps an untrusted thenable and assimilates it in a future stack
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* @param {function} then
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* @param {{then: function}} thenable
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* @constructor
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*/
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function Thenable(then, thenable) {
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Pending.call(this);
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tasks.enqueue(new AssimilateTask(then, thenable, this));
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}
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inherit(Pending, Thenable);
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/**
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* Handler for a fulfilled promise
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* @param {*} x fulfillment value
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* @constructor
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*/
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function Fulfilled(x) {
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Promise.createContext(this);
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this.value = x;
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}
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inherit(Handler, Fulfilled);
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Fulfilled.prototype._state = 1;
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Fulfilled.prototype.fold = function(f, z, c, to) {
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runContinuation3(f, z, this, c, to);
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};
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Fulfilled.prototype.when = function(cont) {
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runContinuation1(cont.fulfilled, this, cont.receiver, cont.resolver);
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};
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var errorId = 0;
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/**
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* Handler for a rejected promise
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* @param {*} x rejection reason
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* @constructor
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*/
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function Rejected(x) {
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Promise.createContext(this);
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this.id = ++errorId;
|
|
this.value = x;
|
|
this.handled = false;
|
|
this.reported = false;
|
|
|
|
this._report();
|
|
}
|
|
|
|
inherit(Handler, Rejected);
|
|
|
|
Rejected.prototype._state = -1;
|
|
|
|
Rejected.prototype.fold = function(f, z, c, to) {
|
|
to.become(this);
|
|
};
|
|
|
|
Rejected.prototype.when = function(cont) {
|
|
if(typeof cont.rejected === 'function') {
|
|
this._unreport();
|
|
}
|
|
runContinuation1(cont.rejected, this, cont.receiver, cont.resolver);
|
|
};
|
|
|
|
Rejected.prototype._report = function(context) {
|
|
tasks.afterQueue(new ReportTask(this, context));
|
|
};
|
|
|
|
Rejected.prototype._unreport = function() {
|
|
if(this.handled) {
|
|
return;
|
|
}
|
|
this.handled = true;
|
|
tasks.afterQueue(new UnreportTask(this));
|
|
};
|
|
|
|
Rejected.prototype.fail = function(context) {
|
|
Promise.onFatalRejection(this, context === void 0 ? this.context : context);
|
|
};
|
|
|
|
function ReportTask(rejection, context) {
|
|
this.rejection = rejection;
|
|
this.context = context;
|
|
}
|
|
|
|
ReportTask.prototype.run = function() {
|
|
if(!this.rejection.handled) {
|
|
this.rejection.reported = true;
|
|
Promise.onPotentiallyUnhandledRejection(this.rejection, this.context);
|
|
}
|
|
};
|
|
|
|
function UnreportTask(rejection) {
|
|
this.rejection = rejection;
|
|
}
|
|
|
|
UnreportTask.prototype.run = function() {
|
|
if(this.rejection.reported) {
|
|
Promise.onPotentiallyUnhandledRejectionHandled(this.rejection);
|
|
}
|
|
};
|
|
|
|
// Unhandled rejection hooks
|
|
// By default, everything is a noop
|
|
|
|
// TODO: Better names: "annotate"?
|
|
Promise.createContext
|
|
= Promise.enterContext
|
|
= Promise.exitContext
|
|
= Promise.onPotentiallyUnhandledRejection
|
|
= Promise.onPotentiallyUnhandledRejectionHandled
|
|
= Promise.onFatalRejection
|
|
= noop;
|
|
|
|
// Errors and singletons
|
|
|
|
var foreverPendingHandler = new Handler();
|
|
var foreverPendingPromise = new Promise(Handler, foreverPendingHandler);
|
|
|
|
function cycle() {
|
|
return new Rejected(new TypeError('Promise cycle'));
|
|
}
|
|
|
|
// Task runners
|
|
|
|
/**
|
|
* Run a single consumer
|
|
* @constructor
|
|
*/
|
|
function ContinuationTask(continuation, handler) {
|
|
this.continuation = continuation;
|
|
this.handler = handler;
|
|
}
|
|
|
|
ContinuationTask.prototype.run = function() {
|
|
this.handler.join().when(this.continuation);
|
|
};
|
|
|
|
/**
|
|
* Run a queue of progress handlers
|
|
* @constructor
|
|
*/
|
|
function ProgressTask(value, handler) {
|
|
this.handler = handler;
|
|
this.value = value;
|
|
}
|
|
|
|
ProgressTask.prototype.run = function() {
|
|
var q = this.handler.consumers;
|
|
if(q === void 0) {
|
|
return;
|
|
}
|
|
|
|
for (var c, i = 0; i < q.length; ++i) {
|
|
c = q[i];
|
|
runNotify(c.progress, this.value, this.handler, c.receiver, c.resolver);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Assimilate a thenable, sending it's value to resolver
|
|
* @param {function} then
|
|
* @param {object|function} thenable
|
|
* @param {object} resolver
|
|
* @constructor
|
|
*/
|
|
function AssimilateTask(then, thenable, resolver) {
|
|
this._then = then;
|
|
this.thenable = thenable;
|
|
this.resolver = resolver;
|
|
}
|
|
|
|
AssimilateTask.prototype.run = function() {
|
|
var h = this.resolver;
|
|
tryAssimilate(this._then, this.thenable, _resolve, _reject, _notify);
|
|
|
|
function _resolve(x) { h.resolve(x); }
|
|
function _reject(x) { h.reject(x); }
|
|
function _notify(x) { h.notify(x); }
|
|
};
|
|
|
|
function tryAssimilate(then, thenable, resolve, reject, notify) {
|
|
try {
|
|
then.call(thenable, resolve, reject, notify);
|
|
} catch (e) {
|
|
reject(e);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Fold a handler value with z
|
|
* @constructor
|
|
*/
|
|
function Fold(f, z, c, to) {
|
|
this.f = f; this.z = z; this.c = c; this.to = to;
|
|
this.resolver = failIfRejected;
|
|
this.receiver = this;
|
|
}
|
|
|
|
Fold.prototype.fulfilled = function(x) {
|
|
this.f.call(this.c, this.z, x, this.to);
|
|
};
|
|
|
|
Fold.prototype.rejected = function(x) {
|
|
this.to.reject(x);
|
|
};
|
|
|
|
Fold.prototype.progress = function(x) {
|
|
this.to.notify(x);
|
|
};
|
|
|
|
// Other helpers
|
|
|
|
/**
|
|
* @param {*} x
|
|
* @returns {boolean} true iff x is a trusted Promise
|
|
*/
|
|
function isPromise(x) {
|
|
return x instanceof Promise;
|
|
}
|
|
|
|
/**
|
|
* Test just enough to rule out primitives, in order to take faster
|
|
* paths in some code
|
|
* @param {*} x
|
|
* @returns {boolean} false iff x is guaranteed *not* to be a thenable
|
|
*/
|
|
function maybeThenable(x) {
|
|
return (typeof x === 'object' || typeof x === 'function') && x !== null;
|
|
}
|
|
|
|
function runContinuation1(f, h, receiver, next) {
|
|
if(typeof f !== 'function') {
|
|
return next.become(h);
|
|
}
|
|
|
|
Promise.enterContext(h);
|
|
tryCatchReject(f, h.value, receiver, next);
|
|
Promise.exitContext();
|
|
}
|
|
|
|
function runContinuation3(f, x, h, receiver, next) {
|
|
if(typeof f !== 'function') {
|
|
return next.become(h);
|
|
}
|
|
|
|
Promise.enterContext(h);
|
|
tryCatchReject3(f, x, h.value, receiver, next);
|
|
Promise.exitContext();
|
|
}
|
|
|
|
/**
|
|
* @deprecated
|
|
*/
|
|
function runNotify(f, x, h, receiver, next) {
|
|
if(typeof f !== 'function') {
|
|
return next.notify(x);
|
|
}
|
|
|
|
Promise.enterContext(h);
|
|
tryCatchReturn(f, x, receiver, next);
|
|
Promise.exitContext();
|
|
}
|
|
|
|
function tryCatch2(f, a, b) {
|
|
try {
|
|
return f(a, b);
|
|
} catch(e) {
|
|
return reject(e);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Return f.call(thisArg, x), or if it throws return a rejected promise for
|
|
* the thrown exception
|
|
*/
|
|
function tryCatchReject(f, x, thisArg, next) {
|
|
try {
|
|
next.become(getHandler(f.call(thisArg, x)));
|
|
} catch(e) {
|
|
next.become(new Rejected(e));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Same as above, but includes the extra argument parameter.
|
|
*/
|
|
function tryCatchReject3(f, x, y, thisArg, next) {
|
|
try {
|
|
f.call(thisArg, x, y, next);
|
|
} catch(e) {
|
|
next.become(new Rejected(e));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @deprecated
|
|
* Return f.call(thisArg, x), or if it throws, *return* the exception
|
|
*/
|
|
function tryCatchReturn(f, x, thisArg, next) {
|
|
try {
|
|
next.notify(f.call(thisArg, x));
|
|
} catch(e) {
|
|
next.notify(e);
|
|
}
|
|
}
|
|
|
|
function inherit(Parent, Child) {
|
|
Child.prototype = objectCreate(Parent.prototype);
|
|
Child.prototype.constructor = Child;
|
|
}
|
|
|
|
function snd(x, y) {
|
|
return y;
|
|
}
|
|
|
|
function noop() {}
|
|
|
|
return Promise;
|
|
};
|
|
});
|
|
}(typeof define === 'function' && define.amd ? define : function(factory) { module.exports = factory(); }));
|