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'use strict';
//This file contains the ES6 extensions to the core Promises/A+ API
var Promise = require('./core.js');
module.exports = Promise;
/* Static Functions */
var TRUE = valuePromise(true);
var FALSE = valuePromise(false);
var NULL = valuePromise(null);
var UNDEFINED = valuePromise(undefined);
var ZERO = valuePromise(0);
var EMPTYSTRING = valuePromise('');
function valuePromise(value) {
var p = new Promise(Promise._noop);
p._state = 1;
p._value = value;
return p;
}
Promise.resolve = function (value) {
if (value instanceof Promise) return value;
if (value === null) return NULL;
if (value === undefined) return UNDEFINED;
if (value === true) return TRUE;
if (value === false) return FALSE;
if (value === 0) return ZERO;
if (value === '') return EMPTYSTRING;
if (typeof value === 'object' || typeof value === 'function') {
try {
var then = value.then;
if (typeof then === 'function') {
return new Promise(then.bind(value));
}
} catch (ex) {
return new Promise(function (resolve, reject) {
reject(ex);
});
}
}
return valuePromise(value);
};
var iterableToArray = function (iterable) {
if (typeof Array.from === 'function') {
// ES2015+, iterables exist
iterableToArray = Array.from;
return Array.from(iterable);
}
// ES5, only arrays and array-likes exist
iterableToArray = function (x) { return Array.prototype.slice.call(x); };
return Array.prototype.slice.call(iterable);
}
Promise.all = function (arr) {
var args = iterableToArray(arr);
return new Promise(function (resolve, reject) {
if (args.length === 0) return resolve([]);
var remaining = args.length;
function res(i, val) {
if (val && (typeof val === 'object' || typeof val === 'function')) {
if (val instanceof Promise && val.then === Promise.prototype.then) {
while (val._state === 3) {
val = val._value;
}
if (val._state === 1) return res(i, val._value);
if (val._state === 2) reject(val._value);
val.then(function (val) {
res(i, val);
}, reject);
return;
} else {
var then = val.then;
if (typeof then === 'function') {
var p = new Promise(then.bind(val));
p.then(function (val) {
res(i, val);
}, reject);
return;
}
}
}
args[i] = val;
if (--remaining === 0) {
resolve(args);
}
}
for (var i = 0; i < args.length; i++) {
res(i, args[i]);
}
});
};
Promise.reject = function (value) {
return new Promise(function (resolve, reject) {
reject(value);
});
};
Promise.race = function (values) {
return new Promise(function (resolve, reject) {
iterableToArray(values).forEach(function(value){
Promise.resolve(value).then(resolve, reject);
});
});
};
/* Prototype Methods */
Promise.prototype['catch'] = function (onRejected) {
return this.then(null, onRejected);
};