diff options
-rw-r--r-- | app/assets/javascripts/application.js | 3 | ||||
-rw-r--r-- | package.json | 1 | ||||
-rw-r--r-- | vendor/assets/javascripts/es6-promise.auto.js | 1156 |
3 files changed, 2 insertions, 1158 deletions
diff --git a/app/assets/javascripts/application.js b/app/assets/javascripts/application.js index c9612784f9b..4b5c9686cab 100644 --- a/app/assets/javascripts/application.js +++ b/app/assets/javascripts/application.js @@ -56,8 +56,7 @@ requireAll(require.context('./u2f', false, /^\.\/.*\.(js|es6)$/)); requireAll(require.context('./droplab', false, /^\.\/.*\.(js|es6)$/)); requireAll(require.context('.', false, /^\.\/(?!application\.js).*\.(js|es6)$/)); require('vendor/fuzzaldrin-plus'); -window.ES6Promise = require('vendor/es6-promise.auto'); -window.ES6Promise.polyfill(); +require('es6-promise').polyfill(); (function () { document.addEventListener('beforeunload', function () { diff --git a/package.json b/package.json index 24e11a4607f..e36925aa4f2 100644 --- a/package.json +++ b/package.json @@ -19,6 +19,7 @@ "compression-webpack-plugin": "^0.3.2", "d3": "3.5.11", "dropzone": "4.2.0", + "es6-promise": "^4.0.5", "imports-loader": "^0.6.5", "jquery": "2.2.1", "jquery-ui": "github:jquery/jquery-ui#1.11.4", diff --git a/vendor/assets/javascripts/es6-promise.auto.js b/vendor/assets/javascripts/es6-promise.auto.js deleted file mode 100644 index b8887115a37..00000000000 --- a/vendor/assets/javascripts/es6-promise.auto.js +++ /dev/null @@ -1,1156 +0,0 @@ -/*! - * @overview es6-promise - a tiny implementation of Promises/A+. - * @copyright Copyright (c) 2014 Yehuda Katz, Tom Dale, Stefan Penner and contributors (Conversion to ES6 API by Jake Archibald) - * @license Licensed under MIT license - * See https://raw.githubusercontent.com/stefanpenner/es6-promise/master/LICENSE - * @version 4.0.5 - */ - -(function (global, factory) { - typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() : - typeof define === 'function' && define.amd ? define(factory) : - (global.ES6Promise = factory()); -}(this, (function () { 'use strict'; - -function objectOrFunction(x) { - return typeof x === 'function' || typeof x === 'object' && x !== null; -} - -function isFunction(x) { - return typeof x === 'function'; -} - -var _isArray = undefined; -if (!Array.isArray) { - _isArray = function (x) { - return Object.prototype.toString.call(x) === '[object Array]'; - }; -} else { - _isArray = Array.isArray; -} - -var isArray = _isArray; - -var len = 0; -var vertxNext = undefined; -var customSchedulerFn = undefined; - -var asap = function asap(callback, arg) { - queue[len] = callback; - queue[len + 1] = arg; - len += 2; - if (len === 2) { - // If len is 2, that means that we need to schedule an async flush. - // If additional callbacks are queued before the queue is flushed, they - // will be processed by this flush that we are scheduling. - if (customSchedulerFn) { - customSchedulerFn(flush); - } else { - scheduleFlush(); - } - } -}; - -function setScheduler(scheduleFn) { - customSchedulerFn = scheduleFn; -} - -function setAsap(asapFn) { - asap = asapFn; -} - -var browserWindow = typeof window !== 'undefined' ? window : undefined; -var browserGlobal = browserWindow || {}; -var BrowserMutationObserver = browserGlobal.MutationObserver || browserGlobal.WebKitMutationObserver; -var isNode = typeof self === 'undefined' && typeof process !== 'undefined' && ({}).toString.call(process) === '[object process]'; - -// test for web worker but not in IE10 -var isWorker = typeof Uint8ClampedArray !== 'undefined' && typeof importScripts !== 'undefined' && typeof MessageChannel !== 'undefined'; - -// node -function useNextTick() { - // node version 0.10.x displays a deprecation warning when nextTick is used recursively - // see https://github.com/cujojs/when/issues/410 for details - return function () { - return process.nextTick(flush); - }; -} - -// vertx -function useVertxTimer() { - if (typeof vertxNext !== 'undefined') { - return function () { - vertxNext(flush); - }; - } - - return useSetTimeout(); -} - -function useMutationObserver() { - var iterations = 0; - var observer = new BrowserMutationObserver(flush); - var node = document.createTextNode(''); - observer.observe(node, { characterData: true }); - - return function () { - node.data = iterations = ++iterations % 2; - }; -} - -// web worker -function useMessageChannel() { - var channel = new MessageChannel(); - channel.port1.onmessage = flush; - return function () { - return channel.port2.postMessage(0); - }; -} - -function useSetTimeout() { - // Store setTimeout reference so es6-promise will be unaffected by - // other code modifying setTimeout (like sinon.useFakeTimers()) - var globalSetTimeout = setTimeout; - return function () { - return globalSetTimeout(flush, 1); - }; -} - -var queue = new Array(1000); -function flush() { - for (var i = 0; i < len; i += 2) { - var callback = queue[i]; - var arg = queue[i + 1]; - - callback(arg); - - queue[i] = undefined; - queue[i + 1] = undefined; - } - - len = 0; -} - -function attemptVertx() { - try { - var r = require; - var vertx = r('vertx'); - vertxNext = vertx.runOnLoop || vertx.runOnContext; - return useVertxTimer(); - } catch (e) { - return useSetTimeout(); - } -} - -var scheduleFlush = undefined; -// Decide what async method to use to triggering processing of queued callbacks: -if (isNode) { - scheduleFlush = useNextTick(); -} else if (BrowserMutationObserver) { - scheduleFlush = useMutationObserver(); -} else if (isWorker) { - scheduleFlush = useMessageChannel(); -} else if (browserWindow === undefined && typeof require === 'function') { - scheduleFlush = attemptVertx(); -} else { - scheduleFlush = useSetTimeout(); -} - -function then(onFulfillment, onRejection) { - var _arguments = arguments; - - var parent = this; - - var child = new this.constructor(noop); - - if (child[PROMISE_ID] === undefined) { - makePromise(child); - } - - var _state = parent._state; - - if (_state) { - (function () { - var callback = _arguments[_state - 1]; - asap(function () { - return invokeCallback(_state, child, callback, parent._result); - }); - })(); - } else { - subscribe(parent, child, onFulfillment, onRejection); - } - - return child; -} - -/** - `Promise.resolve` returns a promise that will become resolved with the - passed `value`. It is shorthand for the following: - - ```javascript - let promise = new Promise(function(resolve, reject){ - resolve(1); - }); - - promise.then(function(value){ - // value === 1 - }); - ``` - - Instead of writing the above, your code now simply becomes the following: - - ```javascript - let promise = Promise.resolve(1); - - promise.then(function(value){ - // value === 1 - }); - ``` - - @method resolve - @static - @param {Any} value value that the returned promise will be resolved with - Useful for tooling. - @return {Promise} a promise that will become fulfilled with the given - `value` -*/ -function resolve(object) { - /*jshint validthis:true */ - var Constructor = this; - - if (object && typeof object === 'object' && object.constructor === Constructor) { - return object; - } - - var promise = new Constructor(noop); - _resolve(promise, object); - return promise; -} - -var PROMISE_ID = Math.random().toString(36).substring(16); - -function noop() {} - -var PENDING = void 0; -var FULFILLED = 1; -var REJECTED = 2; - -var GET_THEN_ERROR = new ErrorObject(); - -function selfFulfillment() { - return new TypeError("You cannot resolve a promise with itself"); -} - -function cannotReturnOwn() { - return new TypeError('A promises callback cannot return that same promise.'); -} - -function getThen(promise) { - try { - return promise.then; - } catch (error) { - GET_THEN_ERROR.error = error; - return GET_THEN_ERROR; - } -} - -function tryThen(then, value, fulfillmentHandler, rejectionHandler) { - try { - then.call(value, fulfillmentHandler, rejectionHandler); - } catch (e) { - return e; - } -} - -function handleForeignThenable(promise, thenable, then) { - asap(function (promise) { - var sealed = false; - var error = tryThen(then, thenable, function (value) { - if (sealed) { - return; - } - sealed = true; - if (thenable !== value) { - _resolve(promise, value); - } else { - fulfill(promise, value); - } - }, function (reason) { - if (sealed) { - return; - } - sealed = true; - - _reject(promise, reason); - }, 'Settle: ' + (promise._label || ' unknown promise')); - - if (!sealed && error) { - sealed = true; - _reject(promise, error); - } - }, promise); -} - -function handleOwnThenable(promise, thenable) { - if (thenable._state === FULFILLED) { - fulfill(promise, thenable._result); - } else if (thenable._state === REJECTED) { - _reject(promise, thenable._result); - } else { - subscribe(thenable, undefined, function (value) { - return _resolve(promise, value); - }, function (reason) { - return _reject(promise, reason); - }); - } -} - -function handleMaybeThenable(promise, maybeThenable, then$$) { - if (maybeThenable.constructor === promise.constructor && then$$ === then && maybeThenable.constructor.resolve === resolve) { - handleOwnThenable(promise, maybeThenable); - } else { - if (then$$ === GET_THEN_ERROR) { - _reject(promise, GET_THEN_ERROR.error); - } else if (then$$ === undefined) { - fulfill(promise, maybeThenable); - } else if (isFunction(then$$)) { - handleForeignThenable(promise, maybeThenable, then$$); - } else { - fulfill(promise, maybeThenable); - } - } -} - -function _resolve(promise, value) { - if (promise === value) { - _reject(promise, selfFulfillment()); - } else if (objectOrFunction(value)) { - handleMaybeThenable(promise, value, getThen(value)); - } else { - fulfill(promise, value); - } -} - -function publishRejection(promise) { - if (promise._onerror) { - promise._onerror(promise._result); - } - - publish(promise); -} - -function fulfill(promise, value) { - if (promise._state !== PENDING) { - return; - } - - promise._result = value; - promise._state = FULFILLED; - - if (promise._subscribers.length !== 0) { - asap(publish, promise); - } -} - -function _reject(promise, reason) { - if (promise._state !== PENDING) { - return; - } - promise._state = REJECTED; - promise._result = reason; - - asap(publishRejection, promise); -} - -function subscribe(parent, child, onFulfillment, onRejection) { - var _subscribers = parent._subscribers; - var length = _subscribers.length; - - parent._onerror = null; - - _subscribers[length] = child; - _subscribers[length + FULFILLED] = onFulfillment; - _subscribers[length + REJECTED] = onRejection; - - if (length === 0 && parent._state) { - asap(publish, parent); - } -} - -function publish(promise) { - var subscribers = promise._subscribers; - var settled = promise._state; - - if (subscribers.length === 0) { - return; - } - - var child = undefined, - callback = undefined, - detail = promise._result; - - for (var i = 0; i < subscribers.length; i += 3) { - child = subscribers[i]; - callback = subscribers[i + settled]; - - if (child) { - invokeCallback(settled, child, callback, detail); - } else { - callback(detail); - } - } - - promise._subscribers.length = 0; -} - -function ErrorObject() { - this.error = null; -} - -var TRY_CATCH_ERROR = new ErrorObject(); - -function tryCatch(callback, detail) { - try { - return callback(detail); - } catch (e) { - TRY_CATCH_ERROR.error = e; - return TRY_CATCH_ERROR; - } -} - -function invokeCallback(settled, promise, callback, detail) { - var hasCallback = isFunction(callback), - value = undefined, - error = undefined, - succeeded = undefined, - failed = undefined; - - if (hasCallback) { - value = tryCatch(callback, detail); - - if (value === TRY_CATCH_ERROR) { - failed = true; - error = value.error; - value = null; - } else { - succeeded = true; - } - - if (promise === value) { - _reject(promise, cannotReturnOwn()); - return; - } - } else { - value = detail; - succeeded = true; - } - - if (promise._state !== PENDING) { - // noop - } else if (hasCallback && succeeded) { - _resolve(promise, value); - } else if (failed) { - _reject(promise, error); - } else if (settled === FULFILLED) { - fulfill(promise, value); - } else if (settled === REJECTED) { - _reject(promise, value); - } -} - -function initializePromise(promise, resolver) { - try { - resolver(function resolvePromise(value) { - _resolve(promise, value); - }, function rejectPromise(reason) { - _reject(promise, reason); - }); - } catch (e) { - _reject(promise, e); - } -} - -var id = 0; -function nextId() { - return id++; -} - -function makePromise(promise) { - promise[PROMISE_ID] = id++; - promise._state = undefined; - promise._result = undefined; - promise._subscribers = []; -} - -function Enumerator(Constructor, input) { - this._instanceConstructor = Constructor; - this.promise = new Constructor(noop); - - if (!this.promise[PROMISE_ID]) { - makePromise(this.promise); - } - - if (isArray(input)) { - this._input = input; - this.length = input.length; - this._remaining = input.length; - - this._result = new Array(this.length); - - if (this.length === 0) { - fulfill(this.promise, this._result); - } else { - this.length = this.length || 0; - this._enumerate(); - if (this._remaining === 0) { - fulfill(this.promise, this._result); - } - } - } else { - _reject(this.promise, validationError()); - } -} - -function validationError() { - return new Error('Array Methods must be provided an Array'); -}; - -Enumerator.prototype._enumerate = function () { - var length = this.length; - var _input = this._input; - - for (var i = 0; this._state === PENDING && i < length; i++) { - this._eachEntry(_input[i], i); - } -}; - -Enumerator.prototype._eachEntry = function (entry, i) { - var c = this._instanceConstructor; - var resolve$$ = c.resolve; - - if (resolve$$ === resolve) { - var _then = getThen(entry); - - if (_then === then && entry._state !== PENDING) { - this._settledAt(entry._state, i, entry._result); - } else if (typeof _then !== 'function') { - this._remaining--; - this._result[i] = entry; - } else if (c === Promise) { - var promise = new c(noop); - handleMaybeThenable(promise, entry, _then); - this._willSettleAt(promise, i); - } else { - this._willSettleAt(new c(function (resolve$$) { - return resolve$$(entry); - }), i); - } - } else { - this._willSettleAt(resolve$$(entry), i); - } -}; - -Enumerator.prototype._settledAt = function (state, i, value) { - var promise = this.promise; - - if (promise._state === PENDING) { - this._remaining--; - - if (state === REJECTED) { - _reject(promise, value); - } else { - this._result[i] = value; - } - } - - if (this._remaining === 0) { - fulfill(promise, this._result); - } -}; - -Enumerator.prototype._willSettleAt = function (promise, i) { - var enumerator = this; - - subscribe(promise, undefined, function (value) { - return enumerator._settledAt(FULFILLED, i, value); - }, function (reason) { - return enumerator._settledAt(REJECTED, i, reason); - }); -}; - -/** - `Promise.all` accepts an array of promises, and returns a new promise which - is fulfilled with an array of fulfillment values for the passed promises, or - rejected with the reason of the first passed promise to be rejected. It casts all - elements of the passed iterable to promises as it runs this algorithm. - - Example: - - ```javascript - let promise1 = resolve(1); - let promise2 = resolve(2); - let promise3 = resolve(3); - let promises = [ promise1, promise2, promise3 ]; - - Promise.all(promises).then(function(array){ - // The array here would be [ 1, 2, 3 ]; - }); - ``` - - If any of the `promises` given to `all` are rejected, the first promise - that is rejected will be given as an argument to the returned promises's - rejection handler. For example: - - Example: - - ```javascript - let promise1 = resolve(1); - let promise2 = reject(new Error("2")); - let promise3 = reject(new Error("3")); - let promises = [ promise1, promise2, promise3 ]; - - Promise.all(promises).then(function(array){ - // Code here never runs because there are rejected promises! - }, function(error) { - // error.message === "2" - }); - ``` - - @method all - @static - @param {Array} entries array of promises - @param {String} label optional string for labeling the promise. - Useful for tooling. - @return {Promise} promise that is fulfilled when all `promises` have been - fulfilled, or rejected if any of them become rejected. - @static -*/ -function all(entries) { - return new Enumerator(this, entries).promise; -} - -/** - `Promise.race` returns a new promise which is settled in the same way as the - first passed promise to settle. - - Example: - - ```javascript - let promise1 = new Promise(function(resolve, reject){ - setTimeout(function(){ - resolve('promise 1'); - }, 200); - }); - - let promise2 = new Promise(function(resolve, reject){ - setTimeout(function(){ - resolve('promise 2'); - }, 100); - }); - - Promise.race([promise1, promise2]).then(function(result){ - // result === 'promise 2' because it was resolved before promise1 - // was resolved. - }); - ``` - - `Promise.race` is deterministic in that only the state of the first - settled promise matters. For example, even if other promises given to the - `promises` array argument are resolved, but the first settled promise has - become rejected before the other promises became fulfilled, the returned - promise will become rejected: - - ```javascript - let promise1 = new Promise(function(resolve, reject){ - setTimeout(function(){ - resolve('promise 1'); - }, 200); - }); - - let promise2 = new Promise(function(resolve, reject){ - setTimeout(function(){ - reject(new Error('promise 2')); - }, 100); - }); - - Promise.race([promise1, promise2]).then(function(result){ - // Code here never runs - }, function(reason){ - // reason.message === 'promise 2' because promise 2 became rejected before - // promise 1 became fulfilled - }); - ``` - - An example real-world use case is implementing timeouts: - - ```javascript - Promise.race([ajax('foo.json'), timeout(5000)]) - ``` - - @method race - @static - @param {Array} promises array of promises to observe - Useful for tooling. - @return {Promise} a promise which settles in the same way as the first passed - promise to settle. -*/ -function race(entries) { - /*jshint validthis:true */ - var Constructor = this; - - if (!isArray(entries)) { - return new Constructor(function (_, reject) { - return reject(new TypeError('You must pass an array to race.')); - }); - } else { - return new Constructor(function (resolve, reject) { - var length = entries.length; - for (var i = 0; i < length; i++) { - Constructor.resolve(entries[i]).then(resolve, reject); - } - }); - } -} - -/** - `Promise.reject` returns a promise rejected with the passed `reason`. - It is shorthand for the following: - - ```javascript - let promise = new Promise(function(resolve, reject){ - reject(new Error('WHOOPS')); - }); - - promise.then(function(value){ - // Code here doesn't run because the promise is rejected! - }, function(reason){ - // reason.message === 'WHOOPS' - }); - ``` - - Instead of writing the above, your code now simply becomes the following: - - ```javascript - let promise = Promise.reject(new Error('WHOOPS')); - - promise.then(function(value){ - // Code here doesn't run because the promise is rejected! - }, function(reason){ - // reason.message === 'WHOOPS' - }); - ``` - - @method reject - @static - @param {Any} reason value that the returned promise will be rejected with. - Useful for tooling. - @return {Promise} a promise rejected with the given `reason`. -*/ -function reject(reason) { - /*jshint validthis:true */ - var Constructor = this; - var promise = new Constructor(noop); - _reject(promise, reason); - return promise; -} - -function needsResolver() { - throw new TypeError('You must pass a resolver function as the first argument to the promise constructor'); -} - -function needsNew() { - throw new TypeError("Failed to construct 'Promise': Please use the 'new' operator, this object constructor cannot be called as a function."); -} - -/** - Promise objects represent the eventual result of an asynchronous operation. The - primary way of interacting with a promise is through its `then` method, which - registers callbacks to receive either a promise's eventual value or the reason - why the promise cannot be fulfilled. - - Terminology - ----------- - - - `promise` is an object or function with a `then` method whose behavior conforms to this specification. - - `thenable` is an object or function that defines a `then` method. - - `value` is any legal JavaScript value (including undefined, a thenable, or a promise). - - `exception` is a value that is thrown using the throw statement. - - `reason` is a value that indicates why a promise was rejected. - - `settled` the final resting state of a promise, fulfilled or rejected. - - A promise can be in one of three states: pending, fulfilled, or rejected. - - Promises that are fulfilled have a fulfillment value and are in the fulfilled - state. Promises that are rejected have a rejection reason and are in the - rejected state. A fulfillment value is never a thenable. - - Promises can also be said to *resolve* a value. If this value is also a - promise, then the original promise's settled state will match the value's - settled state. So a promise that *resolves* a promise that rejects will - itself reject, and a promise that *resolves* a promise that fulfills will - itself fulfill. - - - Basic Usage: - ------------ - - ```js - let promise = new Promise(function(resolve, reject) { - // on success - resolve(value); - - // on failure - reject(reason); - }); - - promise.then(function(value) { - // on fulfillment - }, function(reason) { - // on rejection - }); - ``` - - Advanced Usage: - --------------- - - Promises shine when abstracting away asynchronous interactions such as - `XMLHttpRequest`s. - - ```js - function getJSON(url) { - return new Promise(function(resolve, reject){ - let xhr = new XMLHttpRequest(); - - xhr.open('GET', url); - xhr.onreadystatechange = handler; - xhr.responseType = 'json'; - xhr.setRequestHeader('Accept', 'application/json'); - xhr.send(); - - function handler() { - if (this.readyState === this.DONE) { - if (this.status === 200) { - resolve(this.response); - } else { - reject(new Error('getJSON: `' + url + '` failed with status: [' + this.status + ']')); - } - } - }; - }); - } - - getJSON('/posts.json').then(function(json) { - // on fulfillment - }, function(reason) { - // on rejection - }); - ``` - - Unlike callbacks, promises are great composable primitives. - - ```js - Promise.all([ - getJSON('/posts'), - getJSON('/comments') - ]).then(function(values){ - values[0] // => postsJSON - values[1] // => commentsJSON - - return values; - }); - ``` - - @class Promise - @param {function} resolver - Useful for tooling. - @constructor -*/ -function Promise(resolver) { - this[PROMISE_ID] = nextId(); - this._result = this._state = undefined; - this._subscribers = []; - - if (noop !== resolver) { - typeof resolver !== 'function' && needsResolver(); - this instanceof Promise ? initializePromise(this, resolver) : needsNew(); - } -} - -Promise.all = all; -Promise.race = race; -Promise.resolve = resolve; -Promise.reject = reject; -Promise._setScheduler = setScheduler; -Promise._setAsap = setAsap; -Promise._asap = asap; - -Promise.prototype = { - constructor: Promise, - - /** - The primary way of interacting with a promise is through its `then` method, - which registers callbacks to receive either a promise's eventual value or the - reason why the promise cannot be fulfilled. - - ```js - findUser().then(function(user){ - // user is available - }, function(reason){ - // user is unavailable, and you are given the reason why - }); - ``` - - Chaining - -------- - - The return value of `then` is itself a promise. This second, 'downstream' - promise is resolved with the return value of the first promise's fulfillment - or rejection handler, or rejected if the handler throws an exception. - - ```js - findUser().then(function (user) { - return user.name; - }, function (reason) { - return 'default name'; - }).then(function (userName) { - // If `findUser` fulfilled, `userName` will be the user's name, otherwise it - // will be `'default name'` - }); - - findUser().then(function (user) { - throw new Error('Found user, but still unhappy'); - }, function (reason) { - throw new Error('`findUser` rejected and we're unhappy'); - }).then(function (value) { - // never reached - }, function (reason) { - // if `findUser` fulfilled, `reason` will be 'Found user, but still unhappy'. - // If `findUser` rejected, `reason` will be '`findUser` rejected and we're unhappy'. - }); - ``` - If the downstream promise does not specify a rejection handler, rejection reasons will be propagated further downstream. - - ```js - findUser().then(function (user) { - throw new PedagogicalException('Upstream error'); - }).then(function (value) { - // never reached - }).then(function (value) { - // never reached - }, function (reason) { - // The `PedgagocialException` is propagated all the way down to here - }); - ``` - - Assimilation - ------------ - - Sometimes the value you want to propagate to a downstream promise can only be - retrieved asynchronously. This can be achieved by returning a promise in the - fulfillment or rejection handler. The downstream promise will then be pending - until the returned promise is settled. This is called *assimilation*. - - ```js - findUser().then(function (user) { - return findCommentsByAuthor(user); - }).then(function (comments) { - // The user's comments are now available - }); - ``` - - If the assimliated promise rejects, then the downstream promise will also reject. - - ```js - findUser().then(function (user) { - return findCommentsByAuthor(user); - }).then(function (comments) { - // If `findCommentsByAuthor` fulfills, we'll have the value here - }, function (reason) { - // If `findCommentsByAuthor` rejects, we'll have the reason here - }); - ``` - - Simple Example - -------------- - - Synchronous Example - - ```javascript - let result; - - try { - result = findResult(); - // success - } catch(reason) { - // failure - } - ``` - - Errback Example - - ```js - findResult(function(result, err){ - if (err) { - // failure - } else { - // success - } - }); - ``` - - Promise Example; - - ```javascript - findResult().then(function(result){ - // success - }, function(reason){ - // failure - }); - ``` - - Advanced Example - -------------- - - Synchronous Example - - ```javascript - let author, books; - - try { - author = findAuthor(); - books = findBooksByAuthor(author); - // success - } catch(reason) { - // failure - } - ``` - - Errback Example - - ```js - - function foundBooks(books) { - - } - - function failure(reason) { - - } - - findAuthor(function(author, err){ - if (err) { - failure(err); - // failure - } else { - try { - findBoooksByAuthor(author, function(books, err) { - if (err) { - failure(err); - } else { - try { - foundBooks(books); - } catch(reason) { - failure(reason); - } - } - }); - } catch(error) { - failure(err); - } - // success - } - }); - ``` - - Promise Example; - - ```javascript - findAuthor(). - then(findBooksByAuthor). - then(function(books){ - // found books - }).catch(function(reason){ - // something went wrong - }); - ``` - - @method then - @param {Function} onFulfilled - @param {Function} onRejected - Useful for tooling. - @return {Promise} - */ - then: then, - - /** - `catch` is simply sugar for `then(undefined, onRejection)` which makes it the same - as the catch block of a try/catch statement. - - ```js - function findAuthor(){ - throw new Error('couldn't find that author'); - } - - // synchronous - try { - findAuthor(); - } catch(reason) { - // something went wrong - } - - // async with promises - findAuthor().catch(function(reason){ - // something went wrong - }); - ``` - - @method catch - @param {Function} onRejection - Useful for tooling. - @return {Promise} - */ - 'catch': function _catch(onRejection) { - return this.then(null, onRejection); - } -}; - -function polyfill() { - var local = undefined; - - if (typeof global !== 'undefined') { - local = global; - } else if (typeof self !== 'undefined') { - local = self; - } else { - try { - local = Function('return this')(); - } catch (e) { - throw new Error('polyfill failed because global object is unavailable in this environment'); - } - } - - var P = local.Promise; - - if (P) { - var promiseToString = null; - try { - promiseToString = Object.prototype.toString.call(P.resolve()); - } catch (e) { - // silently ignored - } - - if (promiseToString === '[object Promise]' && !P.cast) { - return; - } - } - - local.Promise = Promise; -} - -// Strange compat.. -Promise.polyfill = polyfill; -Promise.Promise = Promise; - -return Promise; - -}))); |