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;(function(window) {
'use strict';
if (typeof window.Promise === 'undefined' ||
window.Promise.toString().indexOf('[native code]') === -1)
{
var PROMISE_STATUS = '[[PromiseStatus]]';
var PROMISE_VALUE = '[[PromiseValue]]';
var STATUS_PENDING = 'pending';
var STATUS_INTERNAL_PENDING = 'internal pending';
var STATUS_RESOLVED = 'resolved';
var STATUS_REJECTED = 'rejected';
/**
* Handles promise done
* @param {Promise} promise
* @param {Handler} deferred
*/
var handle = function(promise, deferred)
{
if (promise[PROMISE_STATUS] === STATUS_INTERNAL_PENDING)
{
promise = promise[PROMISE_VALUE];
}
if (promise[PROMISE_STATUS] === STATUS_PENDING)
{
promise.deferreds.push(deferred);
}
else
{
promise.handled = true;
setTimeout(function() {
var callback = promise[PROMISE_STATUS] === STATUS_RESOLVED ?
deferred.onFulfilled : deferred.onRejected;
if (callback)
{
try {
resolve(deferred.promise, callback(promise[PROMISE_VALUE]));
} catch (err) {
reject(deferred.promise, err);
}
}
else
{
if (promise[PROMISE_STATUS] === STATUS_RESOLVED)
{
resolve(deferred.promise, promise[PROMISE_VALUE]);
}
else
{
reject(deferred.promise, promise[PROMISE_VALUE]);
}
}
}, 0);
}
};
/**
* Resolves promise with value
* @param {Promise} promise
* @param {*} value
*/
var resolve = function(promise, value) {
if (value === promise)
{
throw new TypeError('A promise cannot be resolved with it promise.');
}
try {
if (value && (typeof value === 'object' || typeof value === 'function'))
{
if (value instanceof Promise)
{
promise[PROMISE_STATUS] = STATUS_INTERNAL_PENDING;
promise[PROMISE_VALUE] = value;
finale(promise);
return;
}
else if (typeof value.then === 'function')
{
executePromise(value.then.bind(value), promise);
return;
}
}
promise[PROMISE_STATUS] = STATUS_RESOLVED;
promise[PROMISE_VALUE] = value;
finale(promise);
} catch (err) {
reject(promise, err);
}
};
/**
* Rejects promise with reason
* @param promise
* @param reason
*/
var reject = function(promise, reason)
{
promise[PROMISE_STATUS] = STATUS_REJECTED;
promise[PROMISE_VALUE] = reason;
finale(promise);
};
/**
* Calls async callback
* @param {Promise} promise
*/
var finale = function(promise)
{
if (promise[PROMISE_STATUS] === STATUS_REJECTED && promise.deferreds.length === 0)
{
setTimeout(function() {
if (!promise.handled)
{
console.error('Unhandled Promise Rejection: ' + promise[PROMISE_VALUE]);
}
}, 0);
}
promise.deferreds.forEach(function(deferred) {
handle(promise, deferred);
});
promise.deferreds = null;
};
/**
* Executes promise
* @param {function} resolver - Resolver
* @param {Promise} promise
*/
var executePromise = function(resolver, promise)
{
var done = false;
try {
resolver(resolveWrapper, rejectWrapper);
} catch (err) {
if (!done)
{
done = true;
reject(promise, err);
}
}
// Resolve function
function resolveWrapper(value)
{
if (!done)
{
done = true;
resolve(promise, value);
}
}
// Reject function
function rejectWrapper(reason)
{
if (!done)
{
done = true;
reject(promise, reason);
}
}
};
/**
* Implements interface for works with promise handlers
* @param {?function} [onFulfilled]
* @param {?function} [onRejected]
* @param {Promise} promise
*
* @constructor
*/
var Handler = function(onFulfilled, onRejected, promise)
{
this.onFulfilled = typeof onFulfilled === 'function' ? onFulfilled : null;
this.onRejected = typeof onRejected === 'function' ? onRejected : null;
this.promise = promise;
};
/**
* Implements Promise polyfill
* @param {function} resolver
*
* @constructor
*/
var Promise = function(resolver)
{
this[PROMISE_STATUS] = STATUS_PENDING;
this[PROMISE_VALUE] = null;
this.handled = false;
this.deferreds = [];
// Try execute promise resolver
executePromise(resolver, this);
};
/**
* Appends a rejection handler callback to the promise,
* and returns a new promise resolving to the return value of the callback if it is called,
* or to its original fulfillment value if the promise is instead fulfilled.
*
* @param {function} onRejected
*/
Promise.prototype['catch'] = function(onRejected) {
return this.then(null, onRejected);
};
/**
* Appends fulfillment and rejection handlers to the promise,
* and returns a new promise resolving to the return value of the called handler,
* or to its original settled value if the promise was not handled
* (i.e. if the relevant handler onFulfilled or onRejected is not a function).
*
* @param {function} onFulfilled
* @param {function} [onRejected]
* @returns {Promise}
*/
Promise.prototype.then = function(onFulfilled, onRejected)
{
var promise = new Promise(function() {});
handle(this, new Handler(onFulfilled, onRejected, promise));
return promise;
};
/**
* The method returns a single Promise that resolves when all of the promises
* in the iterable argument have resolved or when the iterable argument contains no promises.
* It rejects with the reason of the first promise that rejects.
*
* @static
* @param iterable - An iterable object such as an Array or String
* @return {Promise}
*/
Promise.all = function(iterable)
{
var args = [].slice.call(iterable);
return new Promise(function(resolve, reject) {
if (args.length === 0)
{
resolve(args);
}
else
{
var remaining = args.length;
var res = function(i, val)
{
try {
if (val && (typeof val === 'object' || typeof val === 'function'))
{
if (typeof val.then === 'function')
{
val.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]);
}
}
});
};
/**
* The method returns a Promise object that is resolved with the given value.
* If the value is a thenable (i.e. has a 'then' method),
* the returned promise will 'follow' that thenable, adopting its eventual state;
* if the value was a promise, that object becomes the result of the call to Promise.resolve;
* otherwise the returned promise will be fulfilled with the value.
*
* @param {*|Promise} value - Argument to be resolved by this Promise. Can also be a Promise or a thenable to resolve.
* @returns {Promise}
*/
Promise.resolve = function(value)
{
if (value && typeof value === 'object' && value.constructor === Promise)
{
return value;
}
return new Promise(function(resolve) {
resolve(value);
});
};
/**
* The method returns a Promise object that is rejected with the given reason.
*
* @param {*} reason - Reason why this Promise rejected.
* @returns {Promise}
*/
Promise.reject = function(reason)
{
return new Promise(function(resolve, reject) {
reject(reason);
});
};
/**
* The Promise.race(iterable) method returns a promise that resolves or rejects
* as soon as one of the promises in the iterable resolves or rejects,
* with the value or reason from that promise.
*
* @static
* @param iterable - An iterable object, such as an Array.
* @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols
* @returns {Promise}
*/
Promise.race = function(iterable)
{
return new Promise(function(resolve, reject) {
for (var i = 0, len = iterable.length; i < len; i++)
{
iterable[i].then(resolve, reject);
}
});
};
window.Promise = Promise;
}
})(window);