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Vendor in an IE11 polyfill for Promises
This commit introduces a polyfill to add support for Promises in IE11. This means IE11 can be tested without first running `utils/as_require.js`.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,255 @@ | ||
| /* Copyright (c) 2014 Taylor Hakes | ||
| * Copyright (c) 2014 Forbes Lindesay | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| * of this software and associated documentation files (the "Software"), to deal | ||
| * in the Software without restriction, including without limitation the rights | ||
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| * copies of the Software, and to permit persons to whom the Software is | ||
| * furnished to do so, subject to the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be included in | ||
| * all copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| * THE SOFTWARE. | ||
| */ | ||
|
|
||
| (function (root) { | ||
|
|
||
| // Store setTimeout reference so promise-polyfill will be unaffected by | ||
| // other code modifying setTimeout (like sinon.useFakeTimers()) | ||
| var setTimeoutFunc = setTimeout; | ||
|
|
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| function noop() {} | ||
|
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| // Polyfill for Function.prototype.bind | ||
| function bind(fn, thisArg) { | ||
| return function () { | ||
| fn.apply(thisArg, arguments); | ||
| }; | ||
| } | ||
|
|
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| function Promise(fn) { | ||
| if (typeof this !== 'object') throw new TypeError('Promises must be constructed via new'); | ||
| if (typeof fn !== 'function') throw new TypeError('not a function'); | ||
| this._state = 0; | ||
| this._handled = false; | ||
| this._value = undefined; | ||
| this._deferreds = []; | ||
|
|
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| doResolve(fn, this); | ||
| } | ||
|
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| function handle(self, deferred) { | ||
| while (self._state === 3) { | ||
| self = self._value; | ||
| } | ||
| if (self._state === 0) { | ||
| self._deferreds.push(deferred); | ||
| return; | ||
| } | ||
| self._handled = true; | ||
| Promise._immediateFn(function () { | ||
| var cb = self._state === 1 ? deferred.onFulfilled : deferred.onRejected; | ||
| if (cb === null) { | ||
| (self._state === 1 ? resolve : reject)(deferred.promise, self._value); | ||
| return; | ||
| } | ||
| var ret; | ||
| try { | ||
| ret = cb(self._value); | ||
| } catch (e) { | ||
| reject(deferred.promise, e); | ||
| return; | ||
| } | ||
| resolve(deferred.promise, ret); | ||
| }); | ||
| } | ||
|
|
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| function resolve(self, newValue) { | ||
| try { | ||
| // Promise Resolution Procedure: https://github.com/promises-aplus/promises-spec#the-promise-resolution-procedure | ||
| if (newValue === self) throw new TypeError('A promise cannot be resolved with itself.'); | ||
| if (newValue && (typeof newValue === 'object' || typeof newValue === 'function')) { | ||
| var then = newValue.then; | ||
| if (newValue instanceof Promise) { | ||
| self._state = 3; | ||
| self._value = newValue; | ||
| finale(self); | ||
| return; | ||
| } else if (typeof then === 'function') { | ||
| doResolve(bind(then, newValue), self); | ||
| return; | ||
| } | ||
| } | ||
| self._state = 1; | ||
| self._value = newValue; | ||
| finale(self); | ||
| } catch (e) { | ||
| reject(self, e); | ||
| } | ||
| } | ||
|
|
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| function reject(self, newValue) { | ||
| self._state = 2; | ||
| self._value = newValue; | ||
| finale(self); | ||
| } | ||
|
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| function finale(self) { | ||
| if (self._state === 2 && self._deferreds.length === 0) { | ||
| Promise._immediateFn(function() { | ||
| if (!self._handled) { | ||
| Promise._unhandledRejectionFn(self._value); | ||
| } | ||
| }); | ||
| } | ||
|
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| for (var i = 0, len = self._deferreds.length; i < len; i++) { | ||
| handle(self, self._deferreds[i]); | ||
| } | ||
| self._deferreds = null; | ||
| } | ||
|
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| function Handler(onFulfilled, onRejected, promise) { | ||
| this.onFulfilled = typeof onFulfilled === 'function' ? onFulfilled : null; | ||
| this.onRejected = typeof onRejected === 'function' ? onRejected : null; | ||
| this.promise = promise; | ||
| } | ||
|
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| /** | ||
| * Take a potentially misbehaving resolver function and make sure | ||
| * onFulfilled and onRejected are only called once. | ||
| * | ||
| * Makes no guarantees about asynchrony. | ||
| */ | ||
| function doResolve(fn, self) { | ||
| var done = false; | ||
| try { | ||
| fn(function (value) { | ||
| if (done) return; | ||
| done = true; | ||
| resolve(self, value); | ||
| }, function (reason) { | ||
| if (done) return; | ||
| done = true; | ||
| reject(self, reason); | ||
| }); | ||
| } catch (ex) { | ||
| if (done) return; | ||
| done = true; | ||
| reject(self, ex); | ||
| } | ||
| } | ||
|
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| Promise.prototype['catch'] = function (onRejected) { | ||
| return this.then(null, onRejected); | ||
| }; | ||
|
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| Promise.prototype.then = function (onFulfilled, onRejected) { | ||
| var prom = new (this.constructor)(noop); | ||
|
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| handle(this, new Handler(onFulfilled, onRejected, prom)); | ||
| return prom; | ||
| }; | ||
|
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| Promise.all = function (arr) { | ||
| var args = Array.prototype.slice.call(arr); | ||
|
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| return new Promise(function (resolve, reject) { | ||
| if (args.length === 0) return resolve([]); | ||
| var remaining = args.length; | ||
|
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| function res(i, val) { | ||
| try { | ||
| if (val && (typeof val === 'object' || typeof val === 'function')) { | ||
| var then = val.then; | ||
| if (typeof then === 'function') { | ||
| then.call(val, function (val) { | ||
| res(i, val); | ||
| }, reject); | ||
| return; | ||
| } | ||
| } | ||
| args[i] = val; | ||
| if (--remaining === 0) { | ||
| resolve(args); | ||
| } | ||
| } catch (ex) { | ||
| reject(ex); | ||
| } | ||
| } | ||
|
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| for (var i = 0; i < args.length; i++) { | ||
| res(i, args[i]); | ||
| } | ||
| }); | ||
| }; | ||
|
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| Promise.resolve = function (value) { | ||
| if (value && typeof value === 'object' && value.constructor === Promise) { | ||
| return value; | ||
| } | ||
|
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| return new Promise(function (resolve) { | ||
| resolve(value); | ||
| }); | ||
| }; | ||
|
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| Promise.reject = function (value) { | ||
| return new Promise(function (resolve, reject) { | ||
| reject(value); | ||
| }); | ||
| }; | ||
|
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| Promise.race = function (values) { | ||
| return new Promise(function (resolve, reject) { | ||
| for (var i = 0, len = values.length; i < len; i++) { | ||
| values[i].then(resolve, reject); | ||
| } | ||
| }); | ||
| }; | ||
|
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| // Use polyfill for setImmediate for performance gains | ||
| Promise._immediateFn = (typeof setImmediate === 'function' && function (fn) { setImmediate(fn); }) || | ||
| function (fn) { | ||
| setTimeoutFunc(fn, 0); | ||
| }; | ||
|
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| Promise._unhandledRejectionFn = function _unhandledRejectionFn(err) { | ||
| if (typeof console !== 'undefined' && console) { | ||
| console.warn('Possible Unhandled Promise Rejection:', err); // eslint-disable-line no-console | ||
| } | ||
| }; | ||
|
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||
| /** | ||
| * Set the immediate function to execute callbacks | ||
| * @param fn {function} Function to execute | ||
| * @deprecated | ||
| */ | ||
| Promise._setImmediateFn = function _setImmediateFn(fn) { | ||
| Promise._immediateFn = fn; | ||
| }; | ||
|
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| /** | ||
| * Change the function to execute on unhandled rejection | ||
| * @param {function} fn Function to execute on unhandled rejection | ||
| * @deprecated | ||
| */ | ||
| Promise._setUnhandledRejectionFn = function _setUnhandledRejectionFn(fn) { | ||
| Promise._unhandledRejectionFn = fn; | ||
| }; | ||
|
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| if (typeof module !== 'undefined' && module.exports) { | ||
| module.exports = Promise; | ||
| } else if (!root.Promise) { | ||
| root.Promise = Promise; | ||
| } | ||
|
|
||
| })(this); |
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