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<h1 class="page-title">Source: modules/promise.js</h1>
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<pre class="prettyprint source linenums"><code>/**
* Module for polyfilling promises
*/
(function(w, undefined) {
if (typeof Promise === "undefined")
{
/**
* Promise constructor
*
* @constructor
* @namespace
* @param function fn
*/
w.Promise = function(fn)
{
var state = 'pending';
var value;
var deferred = null;
function resolve(newValue)
{
try
{
if (newValue && typeof newValue.then === 'function')
{
newValue.then(resolve);
return;
}
state = 'resolved';
value = newValue;
if (deferred)
{
handle(deferred);
}
}
catch(e)
{
reject(e);
}
}
function reject(reason)
{
state = 'rejected';
value = reason;
if (deferred)
{
handle(deferred);
}
}
function handle(handler)
{
if (state === 'pending')
{
deferred = onResolved;
return;
}
var handlerCallback;
setTimeout(function() {
handlerCallback = (state === 'resolved')
? handler.onResolved
: handler.onRejected;
if ( ! handlerCallback)
{
(state === 'resolved')
? handler.resolve(value)
: handler.reject(value);
return;
}
try
{
ret = handlerCallback(value);
}
catch(e)
{
handler.reject(e);
return;
}
handler.resolve(ret);
}, 1);
}
this.then = function(onResolved, onRejected) {
return new Promise(function(resolve, reject) {
handle({
onResolved: onResolved,
onRejected: onRejected,
resolve: resolve,
reject: reject
});
});
};
fn(resolve, reject);
}
}
})(window);
</code></pre>
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