Barely working basic playback

libjs/utils/CMakeLists.txt

@@ -4,3 +4,4 @@ configure_file(class.js class.js)
 configure_file(subscribable.js subscribable.js)
 configure_file(globalMethods.js globalMethods.js)
 configure_file(enum.js enum.js)
+configure_file(stateMachine.js stateMachine)

libjs/utils/stateMachine.js

@@ -0,0 +1,33 @@
+"use strict";
+
+var Subscribable = require("./subscribable");
+
+var StateMachine = Subscribable.inherit({
+    className: "StateMachine",
+    constructor: function (initialState, graph) {
+        Subscribable.fn.constructor.call(this);
+        
+        this._state = initialState;
+        this._graph = graph;
+    },
+    manipulation: function (name) {
+        var newState = this._graph[this._state][name];
+        if (newState) {
+            var oldState = this._state;
+            this._state = newState;
+            
+            this.trigger("stateChanged", {
+                newState: newState,
+                manipulation: name,
+                oldState: oldState
+            });
+        } else {
+            this.trigger("stateMissed");
+        }
+    },
+    state: function () {
+        return this._state;
+    }
+});
+
+module.exports = StateMachine;