move event_emitter into pilot

plugins/pilot/lib/event_emitter.js

@@ -0,0 +1,85 @@
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Ajax.org Code Editor (ACE).
+ *
+ * The Initial Developer of the Original Code is
+ * Ajax.org Services B.V.
+ * Portions created by the Initial Developer are Copyright (C) 2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *      Fabian Jakobs <fabian AT ajax DOT org>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+define(function(require, exports, module) {
+
+    var lang = require("pilot/lang").lang;
+
+    var MEventEmitter = {};
+
+    MEventEmitter.$dispatchEvent = function(eventName, e) {
+        this.$eventRegistry = this.$eventRegistry || {};
+
+        var listeners = this.$eventRegistry[eventName];
+        if (!listeners || !listeners.length) return;
+
+        var e = e || {};
+        e.type = eventName;
+
+        for (var i=0; i<listeners.length; i++) {
+            listeners[i](e);
+        }
+    };
+
+    MEventEmitter.on =
+    MEventEmitter.addEventListener = function(eventName, callback) {
+        this.$eventRegistry = this.$eventRegistry || {};
+
+        var listeners = this.$eventRegistry[eventName];
+        if (!listeners) {
+          var listeners = this.$eventRegistry[eventName] = [];
+        }
+        if (lang.arrayIndexOf(listeners, callback) == -1) {
+            listeners.push(callback);
+        }
+    };
+
+    MEventEmitter.removeEventListener = function(eventName, callback) {
+        this.$eventRegistry = this.$eventRegistry || {};
+
+        var listeners = this.$eventRegistry[eventName];
+        if (!listeners) {
+          return;
+        }
+        var index = lang.arrayIndexOf(listeners, callback);
+        if (index !== -1) {
+            listeners.splice(index, 1);
+        }
+    };
+
+    exports.MEventEmitter = MEventEmitter;
+});