Marek Kotewicz
10 years ago
5 changed files with 0 additions and 973 deletions
@ -1,966 +0,0 @@ |
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/*! |
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* @overview es6-promise - a tiny implementation of Promises/A+. |
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* @copyright Copyright (c) 2014 Yehuda Katz, Tom Dale, Stefan Penner and contributors (Conversion to ES6 API by Jake Archibald) |
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* @license Licensed under MIT license |
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* See https://raw.githubusercontent.com/jakearchibald/es6-promise/master/LICENSE
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* @version 2.0.0 |
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*/ |
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(function() { |
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"use strict"; |
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function $$utils$$objectOrFunction(x) { |
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return typeof x === 'function' || (typeof x === 'object' && x !== null); |
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} |
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function $$utils$$isFunction(x) { |
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return typeof x === 'function'; |
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} |
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function $$utils$$isMaybeThenable(x) { |
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return typeof x === 'object' && x !== null; |
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} |
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var $$utils$$_isArray; |
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if (!Array.isArray) { |
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$$utils$$_isArray = function (x) { |
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return Object.prototype.toString.call(x) === '[object Array]'; |
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}; |
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} else { |
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$$utils$$_isArray = Array.isArray; |
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} |
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var $$utils$$isArray = $$utils$$_isArray; |
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var $$utils$$now = Date.now || function() { return new Date().getTime(); }; |
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function $$utils$$F() { } |
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var $$utils$$o_create = (Object.create || function (o) { |
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if (arguments.length > 1) { |
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throw new Error('Second argument not supported'); |
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} |
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if (typeof o !== 'object') { |
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throw new TypeError('Argument must be an object'); |
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} |
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$$utils$$F.prototype = o; |
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return new $$utils$$F(); |
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}); |
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var $$asap$$len = 0; |
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var $$asap$$default = function asap(callback, arg) { |
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$$asap$$queue[$$asap$$len] = callback; |
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$$asap$$queue[$$asap$$len + 1] = arg; |
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$$asap$$len += 2; |
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if ($$asap$$len === 2) { |
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// If len is 1, that means that we need to schedule an async flush.
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// If additional callbacks are queued before the queue is flushed, they
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// will be processed by this flush that we are scheduling.
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$$asap$$scheduleFlush(); |
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} |
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}; |
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var $$asap$$browserGlobal = (typeof window !== 'undefined') ? window : {}; |
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var $$asap$$BrowserMutationObserver = $$asap$$browserGlobal.MutationObserver || $$asap$$browserGlobal.WebKitMutationObserver; |
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// test for web worker but not in IE10
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var $$asap$$isWorker = typeof Uint8ClampedArray !== 'undefined' && |
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typeof importScripts !== 'undefined' && |
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typeof MessageChannel !== 'undefined'; |
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// node
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function $$asap$$useNextTick() { |
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return function() { |
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process.nextTick($$asap$$flush); |
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}; |
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} |
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function $$asap$$useMutationObserver() { |
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var iterations = 0; |
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var observer = new $$asap$$BrowserMutationObserver($$asap$$flush); |
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var node = document.createTextNode(''); |
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observer.observe(node, { characterData: true }); |
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return function() { |
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node.data = (iterations = ++iterations % 2); |
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}; |
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} |
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// web worker
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function $$asap$$useMessageChannel() { |
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var channel = new MessageChannel(); |
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channel.port1.onmessage = $$asap$$flush; |
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return function () { |
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channel.port2.postMessage(0); |
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}; |
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} |
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function $$asap$$useSetTimeout() { |
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return function() { |
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setTimeout($$asap$$flush, 1); |
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}; |
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} |
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var $$asap$$queue = new Array(1000); |
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function $$asap$$flush() { |
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for (var i = 0; i < $$asap$$len; i+=2) { |
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var callback = $$asap$$queue[i]; |
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var arg = $$asap$$queue[i+1]; |
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callback(arg); |
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$$asap$$queue[i] = undefined; |
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$$asap$$queue[i+1] = undefined; |
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} |
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$$asap$$len = 0; |
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} |
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var $$asap$$scheduleFlush; |
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// Decide what async method to use to triggering processing of queued callbacks:
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if (typeof process !== 'undefined' && {}.toString.call(process) === '[object process]') { |
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$$asap$$scheduleFlush = $$asap$$useNextTick(); |
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} else if ($$asap$$BrowserMutationObserver) { |
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$$asap$$scheduleFlush = $$asap$$useMutationObserver(); |
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} else if ($$asap$$isWorker) { |
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$$asap$$scheduleFlush = $$asap$$useMessageChannel(); |
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} else { |
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$$asap$$scheduleFlush = $$asap$$useSetTimeout(); |
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} |
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function $$$internal$$noop() {} |
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var $$$internal$$PENDING = void 0; |
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var $$$internal$$FULFILLED = 1; |
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var $$$internal$$REJECTED = 2; |
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var $$$internal$$GET_THEN_ERROR = new $$$internal$$ErrorObject(); |
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function $$$internal$$selfFullfillment() { |
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return new TypeError("You cannot resolve a promise with itself"); |
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} |
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function $$$internal$$cannotReturnOwn() { |
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return new TypeError('A promises callback cannot return that same promise.') |
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} |
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function $$$internal$$getThen(promise) { |
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try { |
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return promise.then; |
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} catch(error) { |
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$$$internal$$GET_THEN_ERROR.error = error; |
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return $$$internal$$GET_THEN_ERROR; |
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} |
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} |
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function $$$internal$$tryThen(then, value, fulfillmentHandler, rejectionHandler) { |
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try { |
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then.call(value, fulfillmentHandler, rejectionHandler); |
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} catch(e) { |
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return e; |
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} |
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} |
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function $$$internal$$handleForeignThenable(promise, thenable, then) { |
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$$asap$$default(function(promise) { |
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var sealed = false; |
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var error = $$$internal$$tryThen(then, thenable, function(value) { |
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if (sealed) { return; } |
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sealed = true; |
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if (thenable !== value) { |
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$$$internal$$resolve(promise, value); |
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} else { |
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$$$internal$$fulfill(promise, value); |
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} |
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}, function(reason) { |
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if (sealed) { return; } |
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sealed = true; |
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$$$internal$$reject(promise, reason); |
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}, 'Settle: ' + (promise._label || ' unknown promise')); |
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if (!sealed && error) { |
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sealed = true; |
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$$$internal$$reject(promise, error); |
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} |
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}, promise); |
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} |
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function $$$internal$$handleOwnThenable(promise, thenable) { |
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if (thenable._state === $$$internal$$FULFILLED) { |
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$$$internal$$fulfill(promise, thenable._result); |
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} else if (promise._state === $$$internal$$REJECTED) { |
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$$$internal$$reject(promise, thenable._result); |
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} else { |
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$$$internal$$subscribe(thenable, undefined, function(value) { |
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$$$internal$$resolve(promise, value); |
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}, function(reason) { |
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$$$internal$$reject(promise, reason); |
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}); |
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} |
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} |
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function $$$internal$$handleMaybeThenable(promise, maybeThenable) { |
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if (maybeThenable.constructor === promise.constructor) { |
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$$$internal$$handleOwnThenable(promise, maybeThenable); |
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} else { |
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var then = $$$internal$$getThen(maybeThenable); |
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if (then === $$$internal$$GET_THEN_ERROR) { |
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$$$internal$$reject(promise, $$$internal$$GET_THEN_ERROR.error); |
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} else if (then === undefined) { |
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$$$internal$$fulfill(promise, maybeThenable); |
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} else if ($$utils$$isFunction(then)) { |
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$$$internal$$handleForeignThenable(promise, maybeThenable, then); |
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} else { |
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$$$internal$$fulfill(promise, maybeThenable); |
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} |
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} |
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} |
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function $$$internal$$resolve(promise, value) { |
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if (promise === value) { |
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$$$internal$$reject(promise, $$$internal$$selfFullfillment()); |
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} else if ($$utils$$objectOrFunction(value)) { |
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$$$internal$$handleMaybeThenable(promise, value); |
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} else { |
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$$$internal$$fulfill(promise, value); |
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} |
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} |
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function $$$internal$$publishRejection(promise) { |
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if (promise._onerror) { |
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promise._onerror(promise._result); |
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} |
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$$$internal$$publish(promise); |
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} |
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function $$$internal$$fulfill(promise, value) { |
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if (promise._state !== $$$internal$$PENDING) { return; } |
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promise._result = value; |
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promise._state = $$$internal$$FULFILLED; |
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if (promise._subscribers.length === 0) { |
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} else { |
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$$asap$$default($$$internal$$publish, promise); |
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} |
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} |
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function $$$internal$$reject(promise, reason) { |
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if (promise._state !== $$$internal$$PENDING) { return; } |
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promise._state = $$$internal$$REJECTED; |
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promise._result = reason; |
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$$asap$$default($$$internal$$publishRejection, promise); |
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} |
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function $$$internal$$subscribe(parent, child, onFulfillment, onRejection) { |
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var subscribers = parent._subscribers; |
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var length = subscribers.length; |
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parent._onerror = null; |
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subscribers[length] = child; |
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subscribers[length + $$$internal$$FULFILLED] = onFulfillment; |
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subscribers[length + $$$internal$$REJECTED] = onRejection; |
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if (length === 0 && parent._state) { |
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$$asap$$default($$$internal$$publish, parent); |
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} |
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} |
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function $$$internal$$publish(promise) { |
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var subscribers = promise._subscribers; |
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var settled = promise._state; |
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if (subscribers.length === 0) { return; } |
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var child, callback, detail = promise._result; |
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for (var i = 0; i < subscribers.length; i += 3) { |
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child = subscribers[i]; |
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callback = subscribers[i + settled]; |
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if (child) { |
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$$$internal$$invokeCallback(settled, child, callback, detail); |
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} else { |
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callback(detail); |
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} |
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} |
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promise._subscribers.length = 0; |
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} |
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function $$$internal$$ErrorObject() { |
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this.error = null; |
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} |
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var $$$internal$$TRY_CATCH_ERROR = new $$$internal$$ErrorObject(); |
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function $$$internal$$tryCatch(callback, detail) { |
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try { |
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return callback(detail); |
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} catch(e) { |
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$$$internal$$TRY_CATCH_ERROR.error = e; |
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return $$$internal$$TRY_CATCH_ERROR; |
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} |
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} |
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function $$$internal$$invokeCallback(settled, promise, callback, detail) { |
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var hasCallback = $$utils$$isFunction(callback), |
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value, error, succeeded, failed; |
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if (hasCallback) { |
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value = $$$internal$$tryCatch(callback, detail); |
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if (value === $$$internal$$TRY_CATCH_ERROR) { |
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failed = true; |
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error = value.error; |
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value = null; |
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} else { |
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succeeded = true; |
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} |
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if (promise === value) { |
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$$$internal$$reject(promise, $$$internal$$cannotReturnOwn()); |
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return; |
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} |
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} else { |
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value = detail; |
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succeeded = true; |
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} |
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if (promise._state !== $$$internal$$PENDING) { |
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// noop
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} else if (hasCallback && succeeded) { |
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$$$internal$$resolve(promise, value); |
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} else if (failed) { |
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$$$internal$$reject(promise, error); |
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} else if (settled === $$$internal$$FULFILLED) { |
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$$$internal$$fulfill(promise, value); |
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} else if (settled === $$$internal$$REJECTED) { |
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$$$internal$$reject(promise, value); |
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} |
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} |
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function $$$internal$$initializePromise(promise, resolver) { |
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try { |
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resolver(function resolvePromise(value){ |
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$$$internal$$resolve(promise, value); |
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}, function rejectPromise(reason) { |
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$$$internal$$reject(promise, reason); |
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}); |
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} catch(e) { |
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$$$internal$$reject(promise, e); |
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} |
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} |
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function $$$enumerator$$makeSettledResult(state, position, value) { |
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if (state === $$$internal$$FULFILLED) { |
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return { |
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state: 'fulfilled', |
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value: value |
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}; |
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} else { |
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return { |
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state: 'rejected', |
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reason: value |
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}; |
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} |
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} |
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function $$$enumerator$$Enumerator(Constructor, input, abortOnReject, label) { |
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this._instanceConstructor = Constructor; |
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this.promise = new Constructor($$$internal$$noop, label); |
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this._abortOnReject = abortOnReject; |
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if (this._validateInput(input)) { |
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this._input = input; |
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this.length = input.length; |
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this._remaining = input.length; |
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this._init(); |
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if (this.length === 0) { |
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$$$internal$$fulfill(this.promise, this._result); |
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} else { |
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this.length = this.length || 0; |
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this._enumerate(); |
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if (this._remaining === 0) { |
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$$$internal$$fulfill(this.promise, this._result); |
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} |
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} |
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} else { |
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$$$internal$$reject(this.promise, this._validationError()); |
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} |
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} |
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$$$enumerator$$Enumerator.prototype._validateInput = function(input) { |
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return $$utils$$isArray(input); |
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}; |
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$$$enumerator$$Enumerator.prototype._validationError = function() { |
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return new Error('Array Methods must be provided an Array'); |
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}; |
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$$$enumerator$$Enumerator.prototype._init = function() { |
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this._result = new Array(this.length); |
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}; |
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var $$$enumerator$$default = $$$enumerator$$Enumerator; |
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$$$enumerator$$Enumerator.prototype._enumerate = function() { |
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var length = this.length; |
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var promise = this.promise; |
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var input = this._input; |
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for (var i = 0; promise._state === $$$internal$$PENDING && i < length; i++) { |
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this._eachEntry(input[i], i); |
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} |
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}; |
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$$$enumerator$$Enumerator.prototype._eachEntry = function(entry, i) { |
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var c = this._instanceConstructor; |
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if ($$utils$$isMaybeThenable(entry)) { |
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if (entry.constructor === c && entry._state !== $$$internal$$PENDING) { |
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entry._onerror = null; |
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this._settledAt(entry._state, i, entry._result); |
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} else { |
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this._willSettleAt(c.resolve(entry), i); |
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} |
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} else { |
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this._remaining--; |
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this._result[i] = this._makeResult($$$internal$$FULFILLED, i, entry); |
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} |
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}; |
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$$$enumerator$$Enumerator.prototype._settledAt = function(state, i, value) { |
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var promise = this.promise; |
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if (promise._state === $$$internal$$PENDING) { |
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this._remaining--; |
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if (this._abortOnReject && state === $$$internal$$REJECTED) { |
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$$$internal$$reject(promise, value); |
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} else { |
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this._result[i] = this._makeResult(state, i, value); |
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} |
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} |
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if (this._remaining === 0) { |
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$$$internal$$fulfill(promise, this._result); |
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} |
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}; |
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$$$enumerator$$Enumerator.prototype._makeResult = function(state, i, value) { |
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return value; |
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}; |
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$$$enumerator$$Enumerator.prototype._willSettleAt = function(promise, i) { |
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var enumerator = this; |
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$$$internal$$subscribe(promise, undefined, function(value) { |
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enumerator._settledAt($$$internal$$FULFILLED, i, value); |
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}, function(reason) { |
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enumerator._settledAt($$$internal$$REJECTED, i, reason); |
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}); |
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}; |
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var $$promise$all$$default = function all(entries, label) { |
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return new $$$enumerator$$default(this, entries, true /* abort on reject */, label).promise; |
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}; |
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var $$promise$race$$default = function race(entries, label) { |
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/*jshint validthis:true */ |
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var Constructor = this; |
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var promise = new Constructor($$$internal$$noop, label); |
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if (!$$utils$$isArray(entries)) { |
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$$$internal$$reject(promise, new TypeError('You must pass an array to race.')); |
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return promise; |
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} |
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var length = entries.length; |
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function onFulfillment(value) { |
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$$$internal$$resolve(promise, value); |
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} |
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function onRejection(reason) { |
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$$$internal$$reject(promise, reason); |
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} |
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for (var i = 0; promise._state === $$$internal$$PENDING && i < length; i++) { |
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$$$internal$$subscribe(Constructor.resolve(entries[i]), undefined, onFulfillment, onRejection); |
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} |
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return promise; |
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}; |
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var $$promise$resolve$$default = function resolve(object, label) { |
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/*jshint validthis:true */ |
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var Constructor = this; |
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|
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if (object && typeof object === 'object' && object.constructor === Constructor) { |
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return object; |
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} |
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var promise = new Constructor($$$internal$$noop, label); |
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$$$internal$$resolve(promise, object); |
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return promise; |
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}; |
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var $$promise$reject$$default = function reject(reason, label) { |
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/*jshint validthis:true */ |
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var Constructor = this; |
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var promise = new Constructor($$$internal$$noop, label); |
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$$$internal$$reject(promise, reason); |
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return promise; |
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}; |
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|
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var $$es6$promise$promise$$counter = 0; |
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|
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function $$es6$promise$promise$$needsResolver() { |
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throw new TypeError('You must pass a resolver function as the first argument to the promise constructor'); |
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} |
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|
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function $$es6$promise$promise$$needsNew() { |
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throw new TypeError("Failed to construct 'Promise': Please use the 'new' operator, this object constructor cannot be called as a function."); |
|||
} |
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|
|||
var $$es6$promise$promise$$default = $$es6$promise$promise$$Promise; |
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|
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/** |
|||
Promise objects represent the eventual result of an asynchronous operation. The |
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primary way of interacting with a promise is through its `then` method, which |
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registers callbacks to receive either a promise’s eventual value or the reason |
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why the promise cannot be fulfilled. |
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|
|||
Terminology |
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----------- |
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|
|||
- `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. |
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|
|||
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
|
|||
var 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){ |
|||
var 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 |
|||
@param {String} label optional string for labeling the promise. |
|||
Useful for tooling. |
|||
@constructor |
|||
*/ |
|||
function $$es6$promise$promise$$Promise(resolver, label) { |
|||
this._id = $$es6$promise$promise$$counter++; |
|||
this._label = label; |
|||
this._state = undefined; |
|||
this._result = undefined; |
|||
this._subscribers = []; |
|||
|
|||
if ($$$internal$$noop !== resolver) { |
|||
if (!$$utils$$isFunction(resolver)) { |
|||
$$es6$promise$promise$$needsResolver(); |
|||
} |
|||
|
|||
if (!(this instanceof $$es6$promise$promise$$Promise)) { |
|||
$$es6$promise$promise$$needsNew(); |
|||
} |
|||
|
|||
$$$internal$$initializePromise(this, resolver); |
|||
} |
|||
} |
|||
|
|||
$$es6$promise$promise$$Promise.all = $$promise$all$$default; |
|||
$$es6$promise$promise$$Promise.race = $$promise$race$$default; |
|||
$$es6$promise$promise$$Promise.resolve = $$promise$resolve$$default; |
|||
$$es6$promise$promise$$Promise.reject = $$promise$reject$$default; |
|||
|
|||
$$es6$promise$promise$$Promise.prototype = { |
|||
constructor: $$es6$promise$promise$$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
|
|||
var 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
|
|||
var 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 |
|||
@param {String} label optional string for labeling the promise. |
|||
Useful for tooling. |
|||
@return {Promise} |
|||
*/ |
|||
then: function(onFulfillment, onRejection, label) { |
|||
var parent = this; |
|||
var state = parent._state; |
|||
|
|||
if (state === $$$internal$$FULFILLED && !onFulfillment || state === $$$internal$$REJECTED && !onRejection) { |
|||
return this; |
|||
} |
|||
|
|||
parent._onerror = null; |
|||
|
|||
var child = new this.constructor($$$internal$$noop, label); |
|||
var result = parent._result; |
|||
|
|||
if (state) { |
|||
var callback = arguments[state - 1]; |
|||
$$asap$$default(function(){ |
|||
$$$internal$$invokeCallback(state, child, callback, result); |
|||
}); |
|||
} else { |
|||
$$$internal$$subscribe(parent, child, onFulfillment, onRejection); |
|||
} |
|||
|
|||
return child; |
|||
}, |
|||
|
|||
/** |
|||
`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 |
|||
@param {String} label optional string for labeling the promise. |
|||
Useful for tooling. |
|||
@return {Promise} |
|||
*/ |
|||
'catch': function(onRejection, label) { |
|||
return this.then(null, onRejection, label); |
|||
} |
|||
}; |
|||
|
|||
var $$es6$promise$polyfill$$default = function polyfill() { |
|||
var local; |
|||
|
|||
if (typeof global !== 'undefined') { |
|||
local = global; |
|||
} else if (typeof window !== 'undefined' && window.document) { |
|||
local = window; |
|||
} else { |
|||
local = self; |
|||
} |
|||
|
|||
var es6PromiseSupport = |
|||
"Promise" in local && |
|||
// Some of these methods are missing from
|
|||
// Firefox/Chrome experimental implementations
|
|||
"resolve" in local.Promise && |
|||
"reject" in local.Promise && |
|||
"all" in local.Promise && |
|||
"race" in local.Promise && |
|||
// Older version of the spec had a resolver object
|
|||
// as the arg rather than a function
|
|||
(function() { |
|||
var resolve; |
|||
new local.Promise(function(r) { resolve = r; }); |
|||
return $$utils$$isFunction(resolve); |
|||
}()); |
|||
|
|||
if (!es6PromiseSupport) { |
|||
local.Promise = $$es6$promise$promise$$default; |
|||
} |
|||
}; |
|||
|
|||
var es6$promise$umd$$ES6Promise = { |
|||
Promise: $$es6$promise$promise$$default, |
|||
polyfill: $$es6$promise$polyfill$$default |
|||
}; |
|||
|
|||
/* global define:true module:true window: true */ |
|||
if (typeof define === 'function' && define['amd']) { |
|||
define(function() { return es6$promise$umd$$ES6Promise; }); |
|||
} else if (typeof module !== 'undefined' && module['exports']) { |
|||
module['exports'] = es6$promise$umd$$ES6Promise; |
|||
} else if (typeof this !== 'undefined') { |
|||
this['ES6Promise'] = es6$promise$umd$$ES6Promise; |
|||
} |
|||
}).call(this); |
|||
Loading…
Reference in new issue