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Edit File: emitter.js

'use strict';

var inherits = require('inherits')
  , EventTarget = require('./eventtarget')
  ;

function EventEmitter() {
  EventTarget.call(this);
}

inherits(EventEmitter, EventTarget);

EventEmitter.prototype.removeAllListeners = function(type) {
  if (type) {
    delete this._listeners[type];
  } else {
    this._listeners = {};
  }
};

EventEmitter.prototype.once = function(type, listener) {
  var self = this
    , fired = false;

function g() {
    self.removeListener(type, g);

if (!fired) {
      fired = true;
      listener.apply(this, arguments);
    }
  }

this.on(type, g);
};

EventEmitter.prototype.emit = function() {
  var type = arguments[0];
  var listeners = this._listeners[type];
  if (!listeners) {
    return;
  }
  // equivalent of Array.prototype.slice.call(arguments, 1);
  var l = arguments.length;
  var args = new Array(l - 1);
  for (var ai = 1; ai < l; ai++) {
    args[ai - 1] = arguments[ai];
  }
  for (var i = 0; i < listeners.length; i++) {
    listeners[i].apply(this, args);
  }
};

EventEmitter.prototype.on = EventEmitter.prototype.addListener = EventTarget.prototype.addEventListener;
EventEmitter.prototype.removeListener = EventTarget.prototype.removeEventListener;

module.exports.EventEmitter = EventEmitter;

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