178 lines
2.8 KiB
JavaScript
178 lines
2.8 KiB
JavaScript
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/**
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* Module exports.
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*/
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exports.EventEmitter = EventEmitter;
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/**
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* Check if `obj` is an array.
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*/
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function isArray(obj) {
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return '[object Array]' == {}.toString.call(obj);
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}
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/**
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* Event emitter constructor.
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*
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* @api public.
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*/
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function EventEmitter(){};
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/**
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* Adds a listener.
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*
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* @api public
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*/
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EventEmitter.prototype.on = function (name, fn) {
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if (!this.$events) {
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this.$events = {};
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}
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if (!this.$events[name]) {
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this.$events[name] = fn;
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} else if (isArray(this.$events[name])) {
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this.$events[name].push(fn);
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} else {
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this.$events[name] = [this.$events[name], fn];
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}
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return this;
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};
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EventEmitter.prototype.addListener = EventEmitter.prototype.on;
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/**
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* Adds a volatile listener.
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*
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* @api public
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*/
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EventEmitter.prototype.once = function (name, fn) {
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var self = this;
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function on () {
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self.removeListener(name, on);
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fn.apply(this, arguments);
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};
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on.listener = fn;
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this.on(name, on);
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return this;
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};
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/**
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* Removes a listener.
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*
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* @api public
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*/
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EventEmitter.prototype.removeListener = function (name, fn) {
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if (this.$events && this.$events[name]) {
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var list = this.$events[name];
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if (isArray(list)) {
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var pos = -1;
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for (var i = 0, l = list.length; i < l; i++) {
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if (list[i] === fn || (list[i].listener && list[i].listener === fn)) {
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pos = i;
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break;
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}
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}
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if (pos < 0) {
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return this;
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}
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list.splice(pos, 1);
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if (!list.length) {
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delete this.$events[name];
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}
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} else if (list === fn || (list.listener && list.listener === fn)) {
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delete this.$events[name];
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}
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}
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return this;
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};
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/**
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* Removes all listeners for an event.
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*
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* @api public
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*/
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EventEmitter.prototype.removeAllListeners = function (name) {
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if (name === undefined) {
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this.$events = {};
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return this;
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}
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if (this.$events && this.$events[name]) {
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this.$events[name] = null;
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}
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return this;
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};
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/**
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* Gets all listeners for a certain event.
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*
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* @api publci
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*/
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EventEmitter.prototype.listeners = function (name) {
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if (!this.$events) {
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this.$events = {};
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}
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if (!this.$events[name]) {
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this.$events[name] = [];
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}
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if (!isArray(this.$events[name])) {
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this.$events[name] = [this.$events[name]];
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}
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return this.$events[name];
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};
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/**
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* Emits an event.
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*
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* @api public
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*/
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EventEmitter.prototype.emit = function (name) {
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if (!this.$events) {
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return false;
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}
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var handler = this.$events[name];
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if (!handler) {
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return false;
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}
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var args = [].slice.call(arguments, 1);
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if ('function' == typeof handler) {
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handler.apply(this, args);
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} else if (isArray(handler)) {
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var listeners = handler.slice();
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for (var i = 0, l = listeners.length; i < l; i++) {
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listeners[i].apply(this, args);
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}
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} else {
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return false;
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}
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return true;
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}; |