discourse/vendor/assets/javascripts/rsvp.js

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JavaScript
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2013-02-05 14:16:51 -05:00
(function(exports) {
"use strict";
var config = {};
var browserGlobal = (typeof window !== 'undefined') ? window : {};
var MutationObserver = browserGlobal.MutationObserver || browserGlobal.WebKitMutationObserver;
var RSVP;
if (typeof process !== 'undefined' &&
{}.toString.call(process) === '[object process]') {
config.async = function(callback, binding) {
process.nextTick(function() {
callback.call(binding);
});
};
} else if (MutationObserver) {
var queue = [];
var observer = new MutationObserver(function() {
var toProcess = queue.slice();
queue = [];
toProcess.forEach(function(tuple) {
var callback = tuple[0], binding = tuple[1];
callback.call(binding);
});
});
var element = document.createElement('div');
observer.observe(element, { attributes: true });
// Chrome Memory Leak: https://bugs.webkit.org/show_bug.cgi?id=93661
window.addEventListener('unload', function(){
observer.disconnect();
observer = null;
});
config.async = function(callback, binding) {
queue.push([callback, binding]);
element.setAttribute('drainQueue', 'drainQueue');
};
} else {
config.async = function(callback, binding) {
setTimeout(function() {
callback.call(binding);
}, 1);
};
}
var Event = function(type, options) {
this.type = type;
for (var option in options) {
if (!options.hasOwnProperty(option)) { continue; }
this[option] = options[option];
}
};
var indexOf = function(callbacks, callback) {
for (var i=0, l=callbacks.length; i<l; i++) {
if (callbacks[i][0] === callback) { return i; }
}
return -1;
};
var callbacksFor = function(object) {
var callbacks = object._promiseCallbacks;
if (!callbacks) {
callbacks = object._promiseCallbacks = {};
}
return callbacks;
};
var EventTarget = {
mixin: function(object) {
object.on = this.on;
object.off = this.off;
object.trigger = this.trigger;
return object;
},
on: function(eventNames, callback, binding) {
var allCallbacks = callbacksFor(this), callbacks, eventName;
eventNames = eventNames.split(/\s+/);
binding = binding || this;
while (eventName = eventNames.shift()) {
callbacks = allCallbacks[eventName];
if (!callbacks) {
callbacks = allCallbacks[eventName] = [];
}
if (indexOf(callbacks, callback) === -1) {
callbacks.push([callback, binding]);
}
}
},
off: function(eventNames, callback) {
var allCallbacks = callbacksFor(this), callbacks, eventName, index;
eventNames = eventNames.split(/\s+/);
while (eventName = eventNames.shift()) {
if (!callback) {
allCallbacks[eventName] = [];
continue;
}
callbacks = allCallbacks[eventName];
index = indexOf(callbacks, callback);
if (index !== -1) { callbacks.splice(index, 1); }
}
},
trigger: function(eventName, options) {
var allCallbacks = callbacksFor(this),
callbacks, callbackTuple, callback, binding, event;
if (callbacks = allCallbacks[eventName]) {
for (var i=0, l=callbacks.length; i<l; i++) {
callbackTuple = callbacks[i];
callback = callbackTuple[0];
binding = callbackTuple[1];
if (typeof options !== 'object') {
options = { detail: options };
}
event = new Event(eventName, options);
callback.call(binding, event);
}
}
}
};
var Promise = function() {
this.on('promise:resolved', function(event) {
this.trigger('success', { detail: event.detail });
}, this);
this.on('promise:failed', function(event) {
this.trigger('error', { detail: event.detail });
}, this);
};
var noop = function() {};
var invokeCallback = function(type, promise, callback, event) {
var hasCallback = typeof callback === 'function',
value, error, succeeded, failed;
if (hasCallback) {
try {
value = callback(event.detail);
succeeded = true;
} catch(e) {
failed = true;
error = e;
}
} else {
value = event.detail;
succeeded = true;
}
if (value && typeof value.then === 'function') {
value.then(function(value) {
promise.resolve(value);
}, function(error) {
promise.reject(error);
});
} else if (hasCallback && succeeded) {
promise.resolve(value);
} else if (failed) {
promise.reject(error);
} else {
promise[type](value);
}
};
Promise.prototype = {
then: function(done, fail) {
var thenPromise = new Promise();
if (this.isResolved) {
config.async(function() {
invokeCallback('resolve', thenPromise, done, { detail: this.resolvedValue });
}, this);
}
if (this.isRejected) {
config.async(function() {
invokeCallback('reject', thenPromise, fail, { detail: this.rejectedValue });
}, this);
}
this.on('promise:resolved', function(event) {
invokeCallback('resolve', thenPromise, done, event);
});
this.on('promise:failed', function(event) {
invokeCallback('reject', thenPromise, fail, event);
});
return thenPromise;
},
resolve: function(value) {
resolve(this, value);
this.resolve = noop;
this.reject = noop;
},
reject: function(value) {
reject(this, value);
this.resolve = noop;
this.reject = noop;
}
};
function resolve(promise, value) {
config.async(function() {
promise.trigger('promise:resolved', { detail: value });
promise.isResolved = true;
promise.resolvedValue = value;
});
}
function reject(promise, value) {
config.async(function() {
promise.trigger('promise:failed', { detail: value });
promise.isRejected = true;
promise.rejectedValue = value;
});
}
function all(promises) {
var i, results = [];
var allPromise = new Promise();
var remaining = promises.length;
if (remaining === 0) {
allPromise.resolve([]);
}
var resolver = function(index) {
return function(value) {
resolve(index, value);
};
};
var resolve = function(index, value) {
results[index] = value;
if (--remaining === 0) {
allPromise.resolve(results);
}
};
var reject = function(error) {
allPromise.reject(error);
};
for (i = 0; i < remaining; i++) {
promises[i].then(resolver(i), reject);
}
return allPromise;
}
EventTarget.mixin(Promise.prototype);
function configure(name, value) {
config[name] = value;
}
exports.Promise = Promise;
exports.Event = Event;
exports.EventTarget = EventTarget;
exports.all = all;
exports.configure = configure;
})(window.RSVP = {});