text: /*
   * Copyright 2014, Gregg Tavares.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Gregg Tavares. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  "use strict";
  
  define([], function() {
  
    /**
     * This is similar to node's EventEmitter.
     * The major difference is calling `addEventListner`
     * or `removeEventListener` with `null` or `undefined`
     * will remove all listeners for that event.
     */
    var EventEmitter = function() {
      var events = {};
      var maxListeners = 10;
  
      var setMaxListeners = function(max) {
        maxListeners = max;
      };
  
      var addEventListener = function(name, handler) {
        if (!handler) {
          delete events[name];
          return;
        }
  
        var handlers = events[name];
        if (!handlers) {
          handlers = [];
          events[name] = handlers;
        }
        handlers.push(handler);
        if (handlers.length > maxListeners) {
          console.warn("More than " + maxListeners + " added to event " + name);
        }
      };
  
      var removeEventListener = function(name, handler) {
        if (!handler) {
          delete events[name];
          return;
        }
  
        var handlers = events[name];
        if (handlers) {
          var ndx = handlers.indexOf(handler);
          if (ndx >= 0) {
            handlers.splice(ndx, 1);
          }
        }
      };
  
      var removeAllEventListeners = function() {
        events = {};
      };
  
      var emit = function(name) {
        var handlers = events[name];
        if (handlers) {
          var args = Array.prototype.slice.call(arguments, 1);
          handlers.forEach(function(handler) {
            handler.apply(this, args);
          });
        }
      };
  
      var listeners = function(name) {
        return events[name];
      };
  
      this.on = addEventListener;
      this.addEventListener = addEventListener
      this.removeEventListener = removeEventListener
      this.removeAllEventListeners = removeAllEventListeners;
      this.addListener = addEventListener
      this.removeListener = removeEventListener
      this.removeAllListeners = removeAllEventListeners;
      this.emit = emit;
      this.listeners = listeners;
      this.setMaxListeners = setMaxListeners;
    };
  
    return EventEmitter;
  });
  
  