mirror of
https://github.com/jquery/jquery.git
synced 2024-11-23 02:54:22 +00:00
3654bc831d
Close gh-4446 Ref gh-4445
374 lines
7.9 KiB
JavaScript
374 lines
7.9 KiB
JavaScript
/*! Native Promise Only
|
|
v0.8.1 (c) Kyle Simpson
|
|
MIT License: http://getify.mit-license.org
|
|
*/
|
|
|
|
(function UMD(name,context,definition){
|
|
// special form of UMD for polyfilling across evironments
|
|
context[name] = context[name] || definition();
|
|
if (typeof module != "undefined" && module.exports) { module.exports = context[name]; }
|
|
else if (typeof define == "function" && define.amd) { define(function $AMD$(){ return context[name]; }); }
|
|
})("Promise",typeof global != "undefined" ? global : this,function DEF(){
|
|
/*jshint validthis:true */
|
|
"use strict";
|
|
|
|
var builtInProp, cycle, scheduling_queue,
|
|
ToString = Object.prototype.toString,
|
|
timer = (typeof setImmediate != "undefined") ?
|
|
function timer(fn) { return setImmediate(fn); } :
|
|
setTimeout
|
|
;
|
|
|
|
// dammit, IE8.
|
|
try {
|
|
Object.defineProperty({},"x",{});
|
|
builtInProp = function builtInProp(obj,name,val,config) {
|
|
return Object.defineProperty(obj,name,{
|
|
value: val,
|
|
writable: true,
|
|
configurable: config !== false
|
|
});
|
|
};
|
|
}
|
|
catch (err) {
|
|
builtInProp = function builtInProp(obj,name,val) {
|
|
obj[name] = val;
|
|
return obj;
|
|
};
|
|
}
|
|
|
|
// Note: using a queue instead of array for efficiency
|
|
scheduling_queue = (function Queue() {
|
|
var first, last, item;
|
|
|
|
function Item(fn,self) {
|
|
this.fn = fn;
|
|
this.self = self;
|
|
this.next = void 0;
|
|
}
|
|
|
|
return {
|
|
add: function add(fn,self) {
|
|
item = new Item(fn,self);
|
|
if (last) {
|
|
last.next = item;
|
|
}
|
|
else {
|
|
first = item;
|
|
}
|
|
last = item;
|
|
item = void 0;
|
|
},
|
|
drain: function drain() {
|
|
var f = first;
|
|
first = last = cycle = void 0;
|
|
|
|
while (f) {
|
|
f.fn.call(f.self);
|
|
f = f.next;
|
|
}
|
|
}
|
|
};
|
|
})();
|
|
|
|
function schedule(fn,self) {
|
|
scheduling_queue.add(fn,self);
|
|
if (!cycle) {
|
|
cycle = timer(scheduling_queue.drain);
|
|
}
|
|
}
|
|
|
|
// promise duck typing
|
|
function isThenable(o) {
|
|
var _then, o_type = typeof o;
|
|
|
|
if (o != null &&
|
|
(
|
|
o_type == "object" || o_type == "function"
|
|
)
|
|
) {
|
|
_then = o.then;
|
|
}
|
|
return typeof _then == "function" ? _then : false;
|
|
}
|
|
|
|
function notify() {
|
|
for (var i=0; i<this.chain.length; i++) {
|
|
notifyIsolated(
|
|
this,
|
|
(this.state === 1) ? this.chain[i].success : this.chain[i].failure,
|
|
this.chain[i]
|
|
);
|
|
}
|
|
this.chain.length = 0;
|
|
}
|
|
|
|
// NOTE: This is a separate function to isolate
|
|
// the `try..catch` so that other code can be
|
|
// optimized better
|
|
function notifyIsolated(self,cb,chain) {
|
|
var ret, _then;
|
|
try {
|
|
if (cb === false) {
|
|
chain.reject(self.msg);
|
|
}
|
|
else {
|
|
if (cb === true) {
|
|
ret = self.msg;
|
|
}
|
|
else {
|
|
ret = cb.call(void 0,self.msg);
|
|
}
|
|
|
|
if (ret === chain.promise) {
|
|
chain.reject(TypeError("Promise-chain cycle"));
|
|
}
|
|
else if (_then = isThenable(ret)) {
|
|
_then.call(ret,chain.resolve,chain.reject);
|
|
}
|
|
else {
|
|
chain.resolve(ret);
|
|
}
|
|
}
|
|
}
|
|
catch (err) {
|
|
chain.reject(err);
|
|
}
|
|
}
|
|
|
|
function resolve(msg) {
|
|
var _then, self = this;
|
|
|
|
// already triggered?
|
|
if (self.triggered) { return; }
|
|
|
|
self.triggered = true;
|
|
|
|
// unwrap
|
|
if (self.def) {
|
|
self = self.def;
|
|
}
|
|
|
|
try {
|
|
if (_then = isThenable(msg)) {
|
|
schedule(function(){
|
|
var def_wrapper = new MakeDefWrapper(self);
|
|
try {
|
|
_then.call(msg,
|
|
function $resolve$(){ resolve.apply(def_wrapper,arguments); },
|
|
function $reject$(){ reject.apply(def_wrapper,arguments); }
|
|
);
|
|
}
|
|
catch (err) {
|
|
reject.call(def_wrapper,err);
|
|
}
|
|
})
|
|
}
|
|
else {
|
|
self.msg = msg;
|
|
self.state = 1;
|
|
if (self.chain.length > 0) {
|
|
schedule(notify,self);
|
|
}
|
|
}
|
|
}
|
|
catch (err) {
|
|
reject.call(new MakeDefWrapper(self),err);
|
|
}
|
|
}
|
|
|
|
function reject(msg) {
|
|
var self = this;
|
|
|
|
// already triggered?
|
|
if (self.triggered) { return; }
|
|
|
|
self.triggered = true;
|
|
|
|
// unwrap
|
|
if (self.def) {
|
|
self = self.def;
|
|
}
|
|
|
|
self.msg = msg;
|
|
self.state = 2;
|
|
if (self.chain.length > 0) {
|
|
schedule(notify,self);
|
|
}
|
|
}
|
|
|
|
function iteratePromises(Constructor,arr,resolver,rejecter) {
|
|
for (var idx=0; idx<arr.length; idx++) {
|
|
(function IIFE(idx){
|
|
Constructor.resolve(arr[idx])
|
|
.then(
|
|
function $resolver$(msg){
|
|
resolver(idx,msg);
|
|
},
|
|
rejecter
|
|
);
|
|
})(idx);
|
|
}
|
|
}
|
|
|
|
function MakeDefWrapper(self) {
|
|
this.def = self;
|
|
this.triggered = false;
|
|
}
|
|
|
|
function MakeDef(self) {
|
|
this.promise = self;
|
|
this.state = 0;
|
|
this.triggered = false;
|
|
this.chain = [];
|
|
this.msg = void 0;
|
|
}
|
|
|
|
function Promise(executor) {
|
|
if (typeof executor != "function") {
|
|
throw TypeError("Not a function");
|
|
}
|
|
|
|
if (this.__NPO__ !== 0) {
|
|
throw TypeError("Not a promise");
|
|
}
|
|
|
|
// instance shadowing the inherited "brand"
|
|
// to signal an already "initialized" promise
|
|
this.__NPO__ = 1;
|
|
|
|
var def = new MakeDef(this);
|
|
|
|
this["then"] = function then(success,failure) {
|
|
var o = {
|
|
success: typeof success == "function" ? success : true,
|
|
failure: typeof failure == "function" ? failure : false
|
|
};
|
|
// Note: `then(..)` itself can be borrowed to be used against
|
|
// a different promise constructor for making the chained promise,
|
|
// by substituting a different `this` binding.
|
|
o.promise = new this.constructor(function extractChain(resolve,reject) {
|
|
if (typeof resolve != "function" || typeof reject != "function") {
|
|
throw TypeError("Not a function");
|
|
}
|
|
|
|
o.resolve = resolve;
|
|
o.reject = reject;
|
|
});
|
|
def.chain.push(o);
|
|
|
|
if (def.state !== 0) {
|
|
schedule(notify,def);
|
|
}
|
|
|
|
return o.promise;
|
|
};
|
|
this["catch"] = function $catch$(failure) {
|
|
return this.then(void 0,failure);
|
|
};
|
|
|
|
try {
|
|
executor.call(
|
|
void 0,
|
|
function publicResolve(msg){
|
|
resolve.call(def,msg);
|
|
},
|
|
function publicReject(msg) {
|
|
reject.call(def,msg);
|
|
}
|
|
);
|
|
}
|
|
catch (err) {
|
|
reject.call(def,err);
|
|
}
|
|
}
|
|
|
|
var PromisePrototype = builtInProp({},"constructor",Promise,
|
|
/*configurable=*/false
|
|
);
|
|
|
|
// Note: Android 4 cannot use `Object.defineProperty(..)` here
|
|
Promise.prototype = PromisePrototype;
|
|
|
|
// built-in "brand" to signal an "uninitialized" promise
|
|
builtInProp(PromisePrototype,"__NPO__",0,
|
|
/*configurable=*/false
|
|
);
|
|
|
|
builtInProp(Promise,"resolve",function Promise$resolve(msg) {
|
|
var Constructor = this;
|
|
|
|
// spec mandated checks
|
|
// note: best "isPromise" check that's practical for now
|
|
if (msg && typeof msg == "object" && msg.__NPO__ === 1) {
|
|
return msg;
|
|
}
|
|
|
|
return new Constructor(function executor(resolve,reject){
|
|
if (typeof resolve != "function" || typeof reject != "function") {
|
|
throw TypeError("Not a function");
|
|
}
|
|
|
|
resolve(msg);
|
|
});
|
|
});
|
|
|
|
builtInProp(Promise,"reject",function Promise$reject(msg) {
|
|
return new this(function executor(resolve,reject){
|
|
if (typeof resolve != "function" || typeof reject != "function") {
|
|
throw TypeError("Not a function");
|
|
}
|
|
|
|
reject(msg);
|
|
});
|
|
});
|
|
|
|
builtInProp(Promise,"all",function Promise$all(arr) {
|
|
var Constructor = this;
|
|
|
|
// spec mandated checks
|
|
if (ToString.call(arr) != "[object Array]") {
|
|
return Constructor.reject(TypeError("Not an array"));
|
|
}
|
|
if (arr.length === 0) {
|
|
return Constructor.resolve([]);
|
|
}
|
|
|
|
return new Constructor(function executor(resolve,reject){
|
|
if (typeof resolve != "function" || typeof reject != "function") {
|
|
throw TypeError("Not a function");
|
|
}
|
|
|
|
var len = arr.length, msgs = Array(len), count = 0;
|
|
|
|
iteratePromises(Constructor,arr,function resolver(idx,msg) {
|
|
msgs[idx] = msg;
|
|
if (++count === len) {
|
|
resolve(msgs);
|
|
}
|
|
},reject);
|
|
});
|
|
});
|
|
|
|
builtInProp(Promise,"race",function Promise$race(arr) {
|
|
var Constructor = this;
|
|
|
|
// spec mandated checks
|
|
if (ToString.call(arr) != "[object Array]") {
|
|
return Constructor.reject(TypeError("Not an array"));
|
|
}
|
|
|
|
return new Constructor(function executor(resolve,reject){
|
|
if (typeof resolve != "function" || typeof reject != "function") {
|
|
throw TypeError("Not a function");
|
|
}
|
|
|
|
iteratePromises(Constructor,arr,function resolver(idx,msg){
|
|
resolve(msg);
|
|
},reject);
|
|
});
|
|
});
|
|
|
|
return Promise;
|
|
});
|