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'use strict';
/**
* Module exports.
*/
exports.EventEmitter = EventEmitter;
/**
* Object#toString reference.
*/
var objToString = Object.prototype.toString;
/**
* Check if a value is an array.
*
* @api private
* @param {*} val The value to test.
* @return {boolean} true if the value is an array, otherwise false.
*/
function isArray (val) {
return objToString.call(val) === '[object Array]';
}
/**
* Event emitter constructor.
*
* @api public
*/
function EventEmitter () {}
/**
* Add a listener.
*
* @api public
* @param {string} name Event name.
* @param {Function} fn Event handler.
* @return {EventEmitter} Emitter instance.
*/
EventEmitter.prototype.on = function (name, fn) {
if (!this.$events) {
this.$events = {};
}
if (!this.$events[name]) {
this.$events[name] = fn;
} else if (isArray(this.$events[name])) {
this.$events[name].push(fn);
} else {
this.$events[name] = [this.$events[name], fn];
}
return this;
};
EventEmitter.prototype.addListener = EventEmitter.prototype.on;
/**
* Adds a volatile listener.
*
* @api public
* @param {string} name Event name.
* @param {Function} fn Event handler.
* @return {EventEmitter} Emitter instance.
*/
EventEmitter.prototype.once = function (name, fn) {
var self = this;
function on () {
self.removeListener(name, on);
fn.apply(this, arguments);
}
on.listener = fn;
this.on(name, on);
return this;
};
/**
* Remove a listener.
*
* @api public
* @param {string} name Event name.
* @param {Function} fn Event handler.
* @return {EventEmitter} Emitter instance.
*/
EventEmitter.prototype.removeListener = function (name, fn) {
if (this.$events && this.$events[name]) {
var list = this.$events[name];
if (isArray(list)) {
var pos = -1;
for (var i = 0, l = list.length; i < l; i++) {
if (list[i] === fn || (list[i].listener && list[i].listener === fn)) {
pos = i;
break;
}
}
if (pos < 0) {
return this;
}
list.splice(pos, 1);
if (!list.length) {
delete this.$events[name];
}
} else if (list === fn || (list.listener && list.listener === fn)) {
delete this.$events[name];
}
}
return this;
};
/**
* Remove all listeners for an event.
*
* @api public
* @param {string} name Event name.
* @return {EventEmitter} Emitter instance.
*/
EventEmitter.prototype.removeAllListeners = function (name) {
if (name === undefined) {
this.$events = {};
return this;
}
if (this.$events && this.$events[name]) {
this.$events[name] = null;
}
return this;
};
/**
* Get all listeners for a given event.
*
* @api public
* @param {string} name Event name.
* @return {EventEmitter} Emitter instance.
*/
EventEmitter.prototype.listeners = function (name) {
if (!this.$events) {
this.$events = {};
}
if (!this.$events[name]) {
this.$events[name] = [];
}
if (!isArray(this.$events[name])) {
this.$events[name] = [this.$events[name]];
}
return this.$events[name];
};
/**
* Emit an event.
*
* @api public
* @param {string} name Event name.
* @return {boolean} true if at least one handler was invoked, else false.
*/
EventEmitter.prototype.emit = function (name) {
if (!this.$events) {
return false;
}
var handler = this.$events[name];
if (!handler) {
return false;
}
var args = Array.prototype.slice.call(arguments, 1);
if (typeof handler === 'function') {
handler.apply(this, args);
} else if (isArray(handler)) {
var listeners = handler.slice();
for (var i = 0, l = listeners.length; i < l; i++) {
listeners[i].apply(this, args);
}
} else {
return false;
}
return true;
};
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