From 911cbb3bfba594464dc521e77166ea3b96551a07 Mon Sep 17 00:00:00 2001
From: nightwing <amirjanyan@gmail.com>
Date: Sat, 2 Feb 2013 18:13:57 +0400
Subject: [PATCH] improve event_emitter - add once - _signal = fast _emit
 without side effects (preventdefault) - capturing argument for addListener

---
 lib/ace/lib/event_emitter.js | 48 ++++++++++++++++++++++++------------
 1 file changed, 32 insertions(+), 16 deletions(-)

diff --git a/lib/ace/lib/event_emitter.js b/lib/ace/lib/event_emitter.js
index 5f4bec86..e572df5e 100644
--- a/lib/ace/lib/event_emitter.js
+++ b/lib/ace/lib/event_emitter.js
@@ -32,11 +32,13 @@ define(function(require, exports, module) {
 "use strict";
 
 var EventEmitter = {};
+var stopPropagation = function() { this.propagationStopped = true; };
+var preventDefault = function() { this.defaultPrevented = true; };
 
 EventEmitter._emit =
 EventEmitter._dispatchEvent = function(eventName, e) {
-    this._eventRegistry = this._eventRegistry || {};
-    this._defaultHandlers = this._defaultHandlers || {};
+    this._eventRegistry || (this._eventRegistry = {});
+    this._defaultHandlers || (this._defaultHandlers = {});
 
     var listeners = this._eventRegistry[eventName] || [];
     var defaultHandler = this._defaultHandlers[eventName];
@@ -48,18 +50,12 @@ EventEmitter._dispatchEvent = function(eventName, e) {
 
     if (!e.type)
         e.type = eventName;
-    
-    if (!e.stopPropagation) {
-        e.stopPropagation = function() {
-            this.propagationStopped = true;
-        };
-    }
-    
-    if (!e.preventDefault) {
-        e.preventDefault = function() {
-            this.defaultPrevented = true;
-        };
-    }
+    if (!e.stopPropagation)
+        e.stopPropagation = stopPropagation;
+    if (!e.preventDefault)
+        e.preventDefault = preventDefault;
+    if (!e.target)
+        e.target = this;
 
     for (var i=0; i<listeners.length; i++) {
         listeners[i](e);
@@ -71,6 +67,26 @@ EventEmitter._dispatchEvent = function(eventName, e) {
         return defaultHandler(e);
 };
 
+
+EventEmitter._signal = function(eventName, e) {
+    var listeners = (this._eventRegistry || {})[eventName];
+    if (!listeners)
+        return;
+
+    for (var i=0; i<listeners.length; i++)
+        listeners[i](e);
+};
+
+EventEmitter.once = function(eventName, callback) {
+    var _self = this;
+    var newCallback = function() {
+        fun && fun.apply(null, arguments);
+        _self.removeEventListener(event, newCallback);
+    };
+    this.addEventListener(event, newCallback);
+};
+
+
 EventEmitter.setDefaultHandler = function(eventName, callback) {
     this._defaultHandlers = this._defaultHandlers || {};
     
@@ -81,7 +97,7 @@ EventEmitter.setDefaultHandler = function(eventName, callback) {
 };
 
 EventEmitter.on =
-EventEmitter.addEventListener = function(eventName, callback) {
+EventEmitter.addEventListener = function(eventName, callback, capturing) {
     this._eventRegistry = this._eventRegistry || {};
 
     var listeners = this._eventRegistry[eventName];
@@ -89,7 +105,7 @@ EventEmitter.addEventListener = function(eventName, callback) {
         listeners = this._eventRegistry[eventName] = [];
 
     if (listeners.indexOf(callback) == -1)
-        listeners.push(callback);
+        listeners[capturing ? "unshift" : "push"](callback);
 };
 
 EventEmitter.removeListener =