Minor simplifications to connections.

core/connection.js

@@ -42,8 +42,10 @@ Blockly.Connection = function(source, type) {
   /** @type {number} */
   this.type = type;
   // Shortcut for the databases for this connection's workspace.
-  this.dbList_ = source.workspace.connectionDBList;
-  this.hidden_ = !this.dbList_;
+  this.db_ = source.workspace.connectionDBList[type];
+  this.dbOpposite_ =
+      source.workspace.connectionDBList[Blockly.OPPOSITE_TYPE[type]];
+  this.hidden_ = !this.db_;
 };
 
 /**
@@ -88,7 +90,7 @@ Blockly.Connection.prototype.dispose = function() {
     throw 'Disconnect connection before disposing of it.';
   }
   if (this.inDB_) {
-    this.dbList_[this.type].removeConnection_(this);
+    this.db_.removeConnection_(this);
   }
   if (Blockly.highlightedConnection_ == this) {
     Blockly.highlightedConnection_ = null;
@@ -96,6 +98,8 @@ Blockly.Connection.prototype.dispose = function() {
   if (Blockly.localConnection_ == this) {
     Blockly.localConnection_ = null;
   }
+  this.db_ = null;
+  this.dbOpposite_ = null;
 };
 
 /**
@@ -242,8 +246,8 @@ Blockly.Connection.prototype.connect = function(otherConnection) {
  */
 Blockly.Connection.singleConnection_ = function(block, orphanBlock) {
   var connection = false;
-  for (var x = 0; x < block.inputList.length; x++) {
-    var thisConnection = block.inputList[x].connection;
+  for (var i = 0; i < block.inputList.length; i++) {
+    var thisConnection = block.inputList[i].connection;
     if (thisConnection && thisConnection.type == Blockly.INPUT_VALUE &&
         orphanBlock.outputConnection.checkType_(thisConnection)) {
       if (connection) {
@@ -351,13 +355,13 @@ Blockly.Connection.prototype.bumpAwayFrom_ = function(staticConnection) {
 Blockly.Connection.prototype.moveTo = function(x, y) {
   // Remove it from its old location in the database (if already present)
   if (this.inDB_) {
-    this.dbList_[this.type].removeConnection_(this);
+    this.db_.removeConnection_(this);
   }
   this.x_ = x;
   this.y_ = y;
   // Insert it into its new location in the database.
   if (!this.hidden_) {
-    this.dbList_[this.type].addConnection_(this);
+    this.db_.addConnection_(this);
   }
 };
 
@@ -441,8 +445,7 @@ Blockly.Connection.prototype.closest = function(maxLimit, dx, dy) {
     return {connection: null, radius: maxLimit};
   }
   // Determine the opposite type of connection.
-  var oppositeType = Blockly.OPPOSITE_TYPE[this.type];
-  var db = this.dbList_[oppositeType];
+  var db = this.dbOpposite_;
 
   // Since this connection is probably being dragged, add the delta.
   var currentX = this.x_ + dx;
@@ -560,8 +563,8 @@ Blockly.Connection.prototype.checkType_ = function(otherConnection) {
     return true;
   }
   // Find any intersection in the check lists.
-  for (var x = 0; x < this.check_.length; x++) {
-    if (otherConnection.check_.indexOf(this.check_[x]) != -1) {
+  for (var i = 0; i < this.check_.length; i++) {
+    if (otherConnection.check_.indexOf(this.check_[i]) != -1) {
       return true;
     }
   }
@@ -608,8 +611,7 @@ Blockly.Connection.prototype.setCheck = function(check) {
  */
 Blockly.Connection.prototype.neighbours_ = function(maxLimit) {
   // Determine the opposite type of connection.
-  var oppositeType = Blockly.OPPOSITE_TYPE[this.type];
-  var db = this.dbList_[oppositeType];
+  var db = this.dbOpposite_;
 
   var currentX = this.x_;
   var currentY = this.y_;
@@ -668,9 +670,9 @@ Blockly.Connection.prototype.neighbours_ = function(maxLimit) {
 Blockly.Connection.prototype.setHidden = function(hidden) {
   this.hidden_ = hidden;
   if (hidden && this.inDB_) {
-    this.dbList_[this.type].removeConnection_(this);
+    this.db_.removeConnection_(this);
   } else if (!hidden && !this.inDB_) {
-    this.dbList_[this.type].addConnection_(this);
+    this.db_.addConnection_(this);
   }
 };
 
@@ -692,8 +694,8 @@ Blockly.Connection.prototype.hideAll = function() {
       }
       // Close all bubbles of all children.
       var icons = block.getIcons();
-      for (var x = 0; x < icons.length; x++) {
-        icons[x].setVisible(false);
+      for (var i = 0; i < icons.length; i++) {
+        icons[i].setVisible(false);
       }
     }
   }
@@ -799,6 +801,7 @@ Blockly.ConnectionDB.prototype.removeConnection_ = function(connection) {
   }
   connection.inDB_ = false;
   // Find the connection using a binary search.
+  // About 10% faster than a linear search using indexOf.
   var pointerMin = 0;
   var pointerMax = this.length - 2;
   var pointerMid = pointerMax;