Include _.Events module.

data.js

@@ -82,6 +82,122 @@
   };
 
 
+
+  // _.Events
+  // -----------------
+
+  // Regular expression used to split event strings
+  var eventSplitter = /\s+/;
+
+  // A module that can be mixed in to *any object* in order to provide it with
+  // custom events. You may bind with `on` or remove with `off` callback functions
+  // to an event; trigger`-ing an event fires all callbacks in succession.
+  //
+  //     var object = {};
+  //     _.extend(object, Backbone.Events);
+  //     object.on('expand', function(){ alert('expanded'); });
+  //     object.trigger('expand');
+  //
+  _.Events = {
+
+    // Bind one or more space separated events, `events`, to a `callback`
+    // function. Passing `"all"` will bind the callback to all events fired.
+    on: function(events, callback, context) {
+
+      var calls, event, node, tail, list;
+      if (!callback) return this;
+      events = events.split(eventSplitter);
+      calls = this._callbacks || (this._callbacks = {});
+
+      // Create an immutable callback list, allowing traversal during
+      // modification.  The tail is an empty object that will always be used
+      // as the next node.
+      while (event = events.shift()) {
+        list = calls[event];
+        node = list ? list.tail : {};
+        node.next = tail = {};
+        node.context = context;
+        node.callback = callback;
+        calls[event] = {tail: tail, next: list ? list.next : node};
+      }
+
+      return this;
+    },
+
+    // Remove one or many callbacks. If `context` is null, removes all callbacks
+    // with that function. If `callback` is null, removes all callbacks for the
+    // event. If `events` is null, removes all bound callbacks for all events.
+    off: function(events, callback, context) {
+      var event, calls, node, tail, cb, ctx;
+
+      // No events, or removing *all* events.
+      if (!(calls = this._callbacks)) return;
+      if (!(events || callback || context)) {
+        delete this._callbacks;
+        return this;
+      }
+
+      // Loop through the listed events and contexts, splicing them out of the
+      // linked list of callbacks if appropriate.
+      events = events ? events.split(eventSplitter) : _.keys(calls);
+      while (event = events.shift()) {
+        node = calls[event];
+        delete calls[event];
+        if (!node || !(callback || context)) continue;
+        // Create a new list, omitting the indicated callbacks.
+        tail = node.tail;
+        while ((node = node.next) !== tail) {
+          cb = node.callback;
+          ctx = node.context;
+          if ((callback && cb !== callback) || (context && ctx !== context)) {
+            this.on(event, cb, ctx);
+          }
+        }
+      }
+
+      return this;
+    },
+
+    // Trigger one or many events, firing all bound callbacks. Callbacks are
+    // passed the same arguments as `trigger` is, apart from the event name
+    // (unless you're listening on `"all"`, which will cause your callback to
+    // receive the true name of the event as the first argument).
+    trigger: function(events) {
+      var event, node, calls, tail, args, all, rest;
+      if (!(calls = this._callbacks)) return this;
+      all = calls.all;
+      events = events.split(eventSplitter);
+      rest = slice.call(arguments, 1);
+
+      // For each event, walk through the linked list of callbacks twice,
+      // first to trigger the event, then to trigger any `"all"` callbacks.
+      while (event = events.shift()) {
+        if (node = calls[event]) {
+          tail = node.tail;
+          while ((node = node.next) !== tail) {
+            node.callback.apply(node.context || this, rest);
+          }
+        }
+        if (node = all) {
+          tail = node.tail;
+          args = [event].concat(rest);
+          while ((node = node.next) !== tail) {
+            node.callback.apply(node.context || this, args);
+          }
+        }
+      }
+
+      return this;
+    }
+
+  };
+
+  // Aliases for backwards compatibility.
+  _.Events.bind   = _.Events.on;
+  _.Events.unbind = _.Events.off;
+
+
+
   // Data.Query
   // --------------
 
@@ -476,4 +592,4 @@
       };
     }
   });
-})();
+})();