ground work for mmix editing

js/servoMixerRuleCollection.js

@@ -0,0 +1,49 @@
+/*global $, ServoMixRule*/
+'use strict';
+
+var ServoMixerRuleCollection = function () {
+
+    var self = {};
+    var data = [];
+
+    self.put = function (element) {
+        data.push(element);
+    };
+
+    self.get = function () {
+        return data;
+    };
+
+    self.drop = function (index) {
+        data[index].setRate(0);
+        self.cleanup();
+    };
+
+    self.flush = function () {
+        data = [];
+    };
+
+    self.cleanup = function () {
+        var tmpData = [];
+
+        data.forEach(function (element) {
+            if (element.isUsed()) {
+                tmpData.push(element);
+            }
+        });
+
+        data = tmpData;
+    };
+
+    self.inflate = function () {
+        while (self.hasFreeSlots()) {
+            self.put(new ServoMixRule(0, 0, 0, 0));
+        }
+    };
+
+    self.hasFreeSlots = function () {
+        return data.length < 16;
+    };
+
+    return self;
+};