80 lines
2 KiB
JavaScript
80 lines
2 KiB
JavaScript
/** @license MIT License (c) copyright 2011-2013 original author or authors */
|
|
|
|
/**
|
|
* Licensed under the MIT License at:
|
|
* http://www.opensource.org/licenses/mit-license.php
|
|
*
|
|
* @author Brian Cavalier
|
|
* @author John Hann
|
|
*/
|
|
(function(define) { 'use strict';
|
|
define(function(require) {
|
|
|
|
var when = require('./when');
|
|
var Promise = when.Promise;
|
|
var toPromise = when.resolve;
|
|
|
|
return {
|
|
all: when.lift(all),
|
|
map: map
|
|
};
|
|
|
|
/**
|
|
* Resolve all the key-value pairs in the supplied object or promise
|
|
* for an object.
|
|
* @param {Promise|object} object or promise for object whose key-value pairs
|
|
* will be resolved
|
|
* @returns {Promise} promise for an object with the fully resolved key-value pairs
|
|
*/
|
|
function all(object) {
|
|
var p = Promise._defer();
|
|
var resolver = Promise._handler(p);
|
|
|
|
var results = {};
|
|
var keys = Object.keys(object);
|
|
var pending = keys.length;
|
|
|
|
for(var i=0, k; i<keys.length; ++i) {
|
|
k = keys[i];
|
|
Promise._handler(object[k]).fold(settleKey, k, results, resolver);
|
|
}
|
|
|
|
if(pending === 0) {
|
|
resolver.resolve(results);
|
|
}
|
|
|
|
return p;
|
|
|
|
function settleKey(k, x, resolver) {
|
|
/*jshint validthis:true*/
|
|
this[k] = x;
|
|
if(--pending === 0) {
|
|
resolver.resolve(results);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Map values in the supplied object's keys
|
|
* @param {Promise|object} object or promise for object whose key-value pairs
|
|
* will be reduced
|
|
* @param {function(value:*, key:String):*} f mapping function which may
|
|
* return either a promise or a value
|
|
* @returns {Promise} promise for an object with the mapped and fully
|
|
* resolved key-value pairs
|
|
*/
|
|
function map(object, f) {
|
|
return toPromise(object).then(function(object) {
|
|
return all(Object.keys(object).reduce(function(o, k) {
|
|
o[k] = toPromise(object[k]).fold(mapWithKey, k);
|
|
return o;
|
|
}, {}));
|
|
});
|
|
|
|
function mapWithKey(k, x) {
|
|
return f(x, k);
|
|
}
|
|
}
|
|
|
|
});
|
|
})(typeof define === 'function' && define.amd ? define : function (factory) { module.exports = factory(require); });
|