add eventemitter.js

public/hft/0.x.x/scripts/eventemitter.js

@@ -0,0 +1,114 @@
+/*
+ * 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;
+});
+