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Issue 1162963002: Revert "Rename polymer and cr_elements v0_8 to v1_0" (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 5 years, 6 months ago
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1 function MakePromise (asap) {
2 function Promise(fn) {
3 if (typeof this !== 'object' || typeof fn !== 'function') throw new TypeError();
4 this._state = null;
5 this._value = null;
6 this._deferreds = []
7
8 doResolve(fn, resolve.bind(this), reject.bind(this));
9 }
10
11 function handle(deferred) {
12 var me = this;
13 if (this._state === null) {
14 this._deferreds.push(deferred);
15 return
16 }
17 asap(function() {
18 var cb = me._state ? deferred.onFulfilled : deferred.onR ejected
19 if (typeof cb !== 'function') {
20 (me._state ? deferred.resolve : deferred.reject) (me._value);
21 return;
22 }
23 var ret;
24 try {
25 ret = cb(me._value);
26 }
27 catch (e) {
28 deferred.reject(e);
29 return;
30 }
31 deferred.resolve(ret);
32 })
33 }
34
35 function resolve(newValue) {
36 try { //Promise Resolution Procedure: https://github.com/promise s-aplus/promises-spec#the-promise-resolution-procedure
37 if (newValue === this) throw new TypeError();
38 if (newValue && (typeof newValue === 'object' || typeof newValue === 'function')) {
39 var then = newValue.then;
40 if (typeof then === 'function') {
41 doResolve(then.bind(newValue), resolve.b ind(this), reject.bind(this));
42 return;
43 }
44 }
45 this._state = true;
46 this._value = newValue;
47 finale.call(this);
48 } catch (e) { reject.call(this, e); }
49 }
50
51 function reject(newValue) {
52 this._state = false;
53 this._value = newValue;
54 finale.call(this);
55 }
56
57 function finale() {
58 for (var i = 0, len = this._deferreds.length; i < len; i++) {
59 handle.call(this, this._deferreds[i]);
60 }
61 this._deferreds = null;
62 }
63
64 /**
65 * Take a potentially misbehaving resolver function and make sure
66 * onFulfilled and onRejected are only called once.
67 *
68 * Makes no guarantees about asynchrony.
69 */
70 function doResolve(fn, onFulfilled, onRejected) {
71 var done = false;
72 try {
73 fn(function (value) {
74 if (done) return;
75 done = true;
76 onFulfilled(value);
77 }, function (reason) {
78 if (done) return;
79 done = true;
80 onRejected(reason);
81 })
82 } catch (ex) {
83 if (done) return;
84 done = true;
85 onRejected(ex);
86 }
87 }
88
89 Promise.prototype['catch'] = function (onRejected) {
90 return this.then(null, onRejected);
91 };
92
93 Promise.prototype.then = function(onFulfilled, onRejected) {
94 var me = this;
95 return new Promise(function(resolve, reject) {
96 handle.call(me, {
97 onFulfilled: onFulfilled,
98 onRejected: onRejected,
99 resolve: resolve,
100 reject: reject
101 });
102 })
103 };
104
105 Promise.resolve = function (value) {
106 if (value && typeof value === 'object' && value.constructor === Promise) {
107 return value;
108 }
109
110 return new Promise(function (resolve) {
111 resolve(value);
112 });
113 };
114
115 Promise.reject = function (value) {
116 return new Promise(function (resolve, reject) {
117 reject(value);
118 });
119 };
120
121
122 return Promise;
123 }
124
125 if (typeof module !== 'undefined') {
126 module.exports = MakePromise;
127 }
128
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