106 lines
2.5 KiB
JavaScript
106 lines
2.5 KiB
JavaScript
/** @license MIT License (c) copyright 2010-2014 original author or authors */
|
|
/** @author Brian Cavalier */
|
|
/** @author John Hann */
|
|
|
|
(function(define) { 'use strict';
|
|
define(function(require) {
|
|
|
|
var when = require('./when');
|
|
var slice = Array.prototype.slice;
|
|
var Promise = when.Promise;
|
|
var reject = Promise.reject;
|
|
|
|
/**
|
|
* Lift a generator to create a function that can suspend and
|
|
* resume using the `yield` keyword to await promises.
|
|
* @param {function} generator
|
|
* @return {function}
|
|
*/
|
|
function lift(generator) {
|
|
return function() {
|
|
return run(generator, this, arguments);
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Immediately call a generator as a promise-aware coroutine
|
|
* that can suspend and resume using the `yield` keyword to
|
|
* await promises. Additional arguments after the first will
|
|
* be passed through to the generator.
|
|
* @param {function} generator
|
|
* @returns {Promise} promise for the ultimate value returned
|
|
* from the generator.
|
|
*/
|
|
function call(generator /*x, y, z...*/) {
|
|
/*jshint validthis:true*/
|
|
return run(generator, this, slice.call(arguments, 1));
|
|
}
|
|
|
|
/**
|
|
* Immediately apply a generator, with the supplied args array,
|
|
* as a promise-aware coroutine that can suspend and resume
|
|
* using the `yield` keyword to await promises.
|
|
* @param {function} generator
|
|
* @param {Array} args arguments with which to initialize the generator
|
|
* @returns {Promise} promise for the ultimate value returned
|
|
* from the generator.
|
|
*/
|
|
function apply(generator, args) {
|
|
/*jshint validthis:true*/
|
|
return run(generator, this, args || []);
|
|
}
|
|
|
|
/**
|
|
* Helper to initiate the provided generator as a coroutine
|
|
* @returns {*}
|
|
*/
|
|
function run(generator, thisArg, args) {
|
|
return runNext(void 0, generator.apply(thisArg, args));
|
|
}
|
|
|
|
function runNext(x, iterator) {
|
|
try {
|
|
return handle(iterator.next(x), iterator);
|
|
} catch(e) {
|
|
return reject(e);
|
|
}
|
|
}
|
|
|
|
function next(x) {
|
|
/*jshint validthis:true*/
|
|
return runNext(x, this);
|
|
}
|
|
|
|
function error(e) {
|
|
/*jshint validthis:true*/
|
|
try {
|
|
return handle(this.throw(e), this);
|
|
} catch(e) {
|
|
return reject(e);
|
|
}
|
|
}
|
|
|
|
function handle(result, iterator) {
|
|
if(result.done) {
|
|
return result.value;
|
|
}
|
|
|
|
var h = Promise._handler(result.value);
|
|
if(h.state() > 0) {
|
|
return runNext(h.value, iterator);
|
|
}
|
|
|
|
var p = Promise._defer();
|
|
h.chain(p._handler, iterator, next, error);
|
|
return p;
|
|
}
|
|
|
|
return {
|
|
lift: lift,
|
|
call: call,
|
|
apply: apply
|
|
};
|
|
|
|
});
|
|
}(typeof define === 'function' && define.amd ? define : function(factory) { module.exports = factory(require); }));
|