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unboundedpress/node_modules/promise/lib/es6-extensions.js

109 lines
2.5 KiB
JavaScript

5 years ago
'use strict';
//This file contains the ES6 extensions to the core Promises/A+ API
var Promise = require('./core.js')
var asap = require('asap')
module.exports = Promise
/* Static Functions */
function ValuePromise(value) {
this.then = function (onFulfilled) {
if (typeof onFulfilled !== 'function') return this
return new Promise(function (resolve, reject) {
asap(function () {
try {
resolve(onFulfilled(value))
} catch (ex) {
reject(ex);
}
})
})
}
}
ValuePromise.prototype = Promise.prototype
var TRUE = new ValuePromise(true)
var FALSE = new ValuePromise(false)
var NULL = new ValuePromise(null)
var UNDEFINED = new ValuePromise(undefined)
var ZERO = new ValuePromise(0)
var EMPTYSTRING = new ValuePromise('')
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 new ValuePromise(value)
}
Promise.all = function (arr) {
var args = Array.prototype.slice.call(arr)
return new Promise(function (resolve, reject) {
if (args.length === 0) return resolve([])
var remaining = args.length
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)
}
}
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) {
values.forEach(function(value){
Promise.resolve(value).then(resolve, reject);
})
});
}
/* Prototype Methods */
Promise.prototype['catch'] = function (onRejected) {
return this.then(null, onRejected);
}