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diff --git a/blockly/generators/javascript/logic.js b/blockly/generators/javascript/logic.js
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+/**
+ * @license
+ * Visual Blocks Language
+ *
+ * Copyright 2012 Google Inc.
+ * https://developers.google.com/blockly/
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Generating JavaScript for logic blocks.
+ * @author q.neutron@gmail.com (Quynh Neutron)
+ */
+'use strict';
+
+goog.provide('Blockly.JavaScript.logic');
+
+goog.require('Blockly.JavaScript');
+
+
+Blockly.JavaScript['controls_if'] = function(block) {
+  // If/elseif/else condition.
+  var n = 0;
+  var argument = Blockly.JavaScript.valueToCode(block, 'IF' + n,
+      Blockly.JavaScript.ORDER_NONE) || 'false';
+  var branch = Blockly.JavaScript.statementToCode(block, 'DO' + n);
+  var code = 'if (' + argument + ') {\n' + branch + '}';
+  for (n = 1; n <= block.elseifCount_; n++) {
+    argument = Blockly.JavaScript.valueToCode(block, 'IF' + n,
+        Blockly.JavaScript.ORDER_NONE) || 'false';
+    branch = Blockly.JavaScript.statementToCode(block, 'DO' + n);
+    code += ' else if (' + argument + ') {\n' + branch + '}';
+  }
+  if (block.elseCount_) {
+    branch = Blockly.JavaScript.statementToCode(block, 'ELSE');
+    code += ' else {\n' + branch + '}';
+  }
+  return code + '\n';
+};
+
+Blockly.JavaScript['logic_compare'] = function(block) {
+  // Comparison operator.
+  var OPERATORS = {
+    'EQ': '==',
+    'NEQ': '!=',
+    'LT': '<',
+    'LTE': '<=',
+    'GT': '>',
+    'GTE': '>='
+  };
+  var operator = OPERATORS[block.getFieldValue('OP')];
+  var order = (operator == '==' || operator == '!=') ?
+      Blockly.JavaScript.ORDER_EQUALITY : Blockly.JavaScript.ORDER_RELATIONAL;
+  var argument0 = Blockly.JavaScript.valueToCode(block, 'A', order) || '0';
+  var argument1 = Blockly.JavaScript.valueToCode(block, 'B', order) || '0';
+  var code = argument0 + ' ' + operator + ' ' + argument1;
+  return [code, order];
+};
+
+Blockly.JavaScript['logic_operation'] = function(block) {
+  // Operations 'and', 'or'.
+  var operator = (block.getFieldValue('OP') == 'AND') ? '&&' : '||';
+  var order = (operator == '&&') ? Blockly.JavaScript.ORDER_LOGICAL_AND :
+      Blockly.JavaScript.ORDER_LOGICAL_OR;
+  var argument0 = Blockly.JavaScript.valueToCode(block, 'A', order);
+  var argument1 = Blockly.JavaScript.valueToCode(block, 'B', order);
+  if (!argument0 && !argument1) {
+    // If there are no arguments, then the return value is false.
+    argument0 = 'false';
+    argument1 = 'false';
+  } else {
+    // Single missing arguments have no effect on the return value.
+    var defaultArgument = (operator == '&&') ? 'true' : 'false';
+    if (!argument0) {
+      argument0 = defaultArgument;
+    }
+    if (!argument1) {
+      argument1 = defaultArgument;
+    }
+  }
+  var code = argument0 + ' ' + operator + ' ' + argument1;
+  return [code, order];
+};
+
+Blockly.JavaScript['logic_negate'] = function(block) {
+  // Negation.
+  var order = Blockly.JavaScript.ORDER_LOGICAL_NOT;
+  var argument0 = Blockly.JavaScript.valueToCode(block, 'BOOL', order) ||
+      'true';
+  var code = '!' + argument0;
+  return [code, order];
+};
+
+Blockly.JavaScript['logic_boolean'] = function(block) {
+  // Boolean values true and false.
+  var code = (block.getFieldValue('BOOL') == 'TRUE') ? 'true' : 'false';
+  return [code, Blockly.JavaScript.ORDER_ATOMIC];
+};
+
+Blockly.JavaScript['logic_null'] = function(block) {
+  // Null data type.
+  return ['null', Blockly.JavaScript.ORDER_ATOMIC];
+};
+
+Blockly.JavaScript['logic_ternary'] = function(block) {
+  // Ternary operator.
+  var value_if = Blockly.JavaScript.valueToCode(block, 'IF',
+      Blockly.JavaScript.ORDER_CONDITIONAL) || 'false';
+  var value_then = Blockly.JavaScript.valueToCode(block, 'THEN',
+      Blockly.JavaScript.ORDER_CONDITIONAL) || 'null';
+  var value_else = Blockly.JavaScript.valueToCode(block, 'ELSE',
+      Blockly.JavaScript.ORDER_CONDITIONAL) || 'null';
+  var code = value_if + ' ? ' + value_then + ' : ' + value_else;
+  return [code, Blockly.JavaScript.ORDER_CONDITIONAL];
+};