filer/lib/eventemitter.js

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JavaScript
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// Based on https://github.com/diy/intercom.js/blob/master/lib/events.js
// Copyright 2012 DIY Co Apache License, Version 2.0
// http://www.apache.org/licenses/LICENSE-2.0
function removeItem(item, array) {
for (var i = array.length - 1; i >= 0; i--) {
if (array[i] === item) {
array.splice(i, 1);
}
}
return array;
}
var EventEmitter = function() {};
EventEmitter.createInterface = function(space) {
var methods = {};
methods.on = function(name, fn) {
if (typeof this[space] === 'undefined') {
this[space] = {};
}
if (!this[space].hasOwnProperty(name)) {
this[space][name] = [];
}
this[space][name].push(fn);
};
methods.off = function(name, fn) {
if (typeof this[space] === 'undefined') return;
if (this[space].hasOwnProperty(name)) {
removeItem(fn, this[space][name]);
}
};
methods.trigger = function(name) {
if (typeof this[space] !== 'undefined' && this[space].hasOwnProperty(name)) {
var args = Array.prototype.slice.call(arguments, 1);
for (var i = 0; i < this[space][name].length; i++) {
this[space][name][i].apply(this[space][name][i], args);
}
}
};
methods.removeAllListeners = function(name) {
if (typeof this[space] === 'undefined') return;
var self = this;
self[space][name].forEach(function(fn) {
self.off(name, fn);
});
};
return methods;
};
var pvt = EventEmitter.createInterface('_handlers');
EventEmitter.prototype._on = pvt.on;
EventEmitter.prototype._off = pvt.off;
EventEmitter.prototype._trigger = pvt.trigger;
var pub = EventEmitter.createInterface('handlers');
EventEmitter.prototype.on = function() {
pub.on.apply(this, arguments);
Array.prototype.unshift.call(arguments, 'on');
this._trigger.apply(this, arguments);
};
EventEmitter.prototype.off = pub.off;
EventEmitter.prototype.trigger = pub.trigger;
EventEmitter.prototype.removeAllListeners = pub.removeAllListeners;
module.exports = EventEmitter;