diff --git a/core/generator.js b/core/generator.js
index f6f5e7a75..b5a794959 100644
--- a/core/generator.js
+++ b/core/generator.js
@@ -158,17 +158,18 @@ Blockly.Generator.prototype.allNestedComments = function(block) {
 /**
  * Generate code for the specified block (and attached blocks).
  * @param {Blockly.Block} block The block to generate code for.
+ * @param {boolean=} opt_thisOnly True to generate code for only this statement.
  * @return {string|!Array} For statement blocks, the generated code.
  *     For value blocks, an array containing the generated code and an
  *     operator order value.  Returns '' if block is null.
  */
-Blockly.Generator.prototype.blockToCode = function(block) {
+Blockly.Generator.prototype.blockToCode = function(block, opt_thisOnly) {
   if (!block) {
     return '';
   }
   if (block.disabled) {
     // Skip past this block if it is disabled.
-    return this.blockToCode(block.getNextBlock());
+    return opt_thisOnly ? '' : this.blockToCode(block.getNextBlock());
   }
 
   var func = this[block.type];
@@ -186,13 +187,13 @@ Blockly.Generator.prototype.blockToCode = function(block) {
     if (!block.outputConnection) {
       throw TypeError('Expecting string from statement block: ' + block.type);
     }
-    return [this.scrub_(block, code[0]), code[1]];
+    return [this.scrub_(block, code[0], opt_thisOnly), code[1]];
   } else if (typeof code == 'string') {
     var id = block.id.replace(/\$/g, '$$$$');  // Issue 251.
     if (this.STATEMENT_PREFIX) {
       code = this.STATEMENT_PREFIX.replace(/%1/g, '\'' + id + '\'') + code;
     }
-    return this.scrub_(block, code);
+    return this.scrub_(block, code, opt_thisOnly);
   } else if (code === null) {
     // Block has handled code generation itself.
     return '';
diff --git a/generators/dart.js b/generators/dart.js
index 4dfb9971f..cc24151d8 100644
--- a/generators/dart.js
+++ b/generators/dart.js
@@ -188,10 +188,11 @@ Blockly.Dart.quote_ = function(string) {
  * Calls any statements following this block.
  * @param {!Blockly.Block} block The current block.
  * @param {string} code The Dart code created for this block.
+ * @param {boolean=} opt_thisOnly True to generate code for only this statement.
  * @return {string} Dart code with comments and subsequent blocks added.
  * @private
  */
-Blockly.Dart.scrub_ = function(block, code) {
+Blockly.Dart.scrub_ = function(block, code, opt_thisOnly) {
   var commentCode = '';
   // Only collect comments for blocks that aren't inline.
   if (!block.outputConnection || !block.outputConnection.targetConnection) {
@@ -221,7 +222,7 @@ Blockly.Dart.scrub_ = function(block, code) {
     }
   }
   var nextBlock = block.nextConnection && block.nextConnection.targetBlock();
-  var nextCode = Blockly.Dart.blockToCode(nextBlock);
+  var nextCode = opt_thisOnly ? '' : Blockly.Dart.blockToCode(nextBlock);
   return commentCode + code + nextCode;
 };
 
diff --git a/generators/javascript.js b/generators/javascript.js
index aa05826c2..ce38b726a 100644
--- a/generators/javascript.js
+++ b/generators/javascript.js
@@ -229,10 +229,11 @@ Blockly.JavaScript.quote_ = function(string) {
  * Calls any statements following this block.
  * @param {!Blockly.Block} block The current block.
  * @param {string} code The JavaScript code created for this block.
+ * @param {boolean=} opt_thisOnly True to generate code for only this statement.
  * @return {string} JavaScript code with comments and subsequent blocks added.
  * @private
  */
-Blockly.JavaScript.scrub_ = function(block, code) {
+Blockly.JavaScript.scrub_ = function(block, code, opt_thisOnly) {
   var commentCode = '';
   // Only collect comments for blocks that aren't inline.
   if (!block.outputConnection || !block.outputConnection.targetConnection) {
@@ -264,7 +265,7 @@ Blockly.JavaScript.scrub_ = function(block, code) {
     }
   }
   var nextBlock = block.nextConnection && block.nextConnection.targetBlock();
-  var nextCode = Blockly.JavaScript.blockToCode(nextBlock);
+  var nextCode = opt_thisOnly ? '' : Blockly.JavaScript.blockToCode(nextBlock);
   return commentCode + code + nextCode;
 };
 
diff --git a/generators/lua.js b/generators/lua.js
index b7f8d5c90..0e05c24dc 100644
--- a/generators/lua.js
+++ b/generators/lua.js
@@ -162,10 +162,11 @@ Blockly.Lua.quote_ = function(string) {
  * Calls any statements following this block.
  * @param {!Blockly.Block} block The current block.
  * @param {string} code The Lua code created for this block.
+ * @param {boolean=} opt_thisOnly True to generate code for only this statement.
  * @return {string} Lua code with comments and subsequent blocks added.
  * @private
  */
-Blockly.Lua.scrub_ = function(block, code) {
+Blockly.Lua.scrub_ = function(block, code, opt_thisOnly) {
   var commentCode = '';
   // Only collect comments for blocks that aren't inline.
   if (!block.outputConnection || !block.outputConnection.targetConnection) {
@@ -190,6 +191,6 @@ Blockly.Lua.scrub_ = function(block, code) {
     }
   }
   var nextBlock = block.nextConnection && block.nextConnection.targetBlock();
-  var nextCode = Blockly.Lua.blockToCode(nextBlock);
+  var nextCode = opt_thisOnly ? '' : Blockly.Lua.blockToCode(nextBlock);
   return commentCode + code + nextCode;
 };
diff --git a/generators/php.js b/generators/php.js
index cd53662dc..cd717abe3 100644
--- a/generators/php.js
+++ b/generators/php.js
@@ -218,10 +218,11 @@ Blockly.PHP.quote_ = function(string) {
  * Calls any statements following this block.
  * @param {!Blockly.Block} block The current block.
  * @param {string} code The PHP code created for this block.
+ * @param {boolean=} opt_thisOnly True to generate code for only this statement.
  * @return {string} PHP code with comments and subsequent blocks added.
  * @private
  */
-Blockly.PHP.scrub_ = function(block, code) {
+Blockly.PHP.scrub_ = function(block, code, opt_thisOnly) {
   var commentCode = '';
   // Only collect comments for blocks that aren't inline.
   if (!block.outputConnection || !block.outputConnection.targetConnection) {
@@ -246,7 +247,7 @@ Blockly.PHP.scrub_ = function(block, code) {
     }
   }
   var nextBlock = block.nextConnection && block.nextConnection.targetBlock();
-  var nextCode = Blockly.PHP.blockToCode(nextBlock);
+  var nextCode = opt_thisOnly ? '' : Blockly.PHP.blockToCode(nextBlock);
   return commentCode + code + nextCode;
 };
 
diff --git a/generators/python.js b/generators/python.js
index 1c25f7ba7..c3d45b8c1 100644
--- a/generators/python.js
+++ b/generators/python.js
@@ -244,10 +244,11 @@ Blockly.Python.quote_ = function(string) {
  * Calls any statements following this block.
  * @param {!Blockly.Block} block The current block.
  * @param {string} code The Python code created for this block.
+ * @param {boolean=} opt_thisOnly True to generate code for only this statement.
  * @return {string} Python code with comments and subsequent blocks added.
  * @private
  */
-Blockly.Python.scrub_ = function(block, code) {
+Blockly.Python.scrub_ = function(block, code, opt_thisOnly) {
   var commentCode = '';
   // Only collect comments for blocks that aren't inline.
   if (!block.outputConnection || !block.outputConnection.targetConnection) {
@@ -277,7 +278,7 @@ Blockly.Python.scrub_ = function(block, code) {
     }
   }
   var nextBlock = block.nextConnection && block.nextConnection.targetBlock();
-  var nextCode = Blockly.Python.blockToCode(nextBlock);
+  var nextCode = opt_thisOnly ? '' : Blockly.Python.blockToCode(nextBlock);
   return commentCode + code + nextCode;
 };
 
diff --git a/tests/jsunit/generator_test.js b/tests/jsunit/generator_test.js
index 069f1c5b3..f1a04cd29 100644
--- a/tests/jsunit/generator_test.js
+++ b/tests/jsunit/generator_test.js
@@ -19,10 +19,169 @@
  */
 'use strict';
 
+goog.require('Blockly.Dart');
+goog.require('Blockly.JavaScript');
+goog.require('Blockly.Lua');
+goog.require('Blockly.PHP');
+goog.require('Blockly.Python');
+
+var workspace;
+
+function defineGeneratorTestBlocks() {
+  Blockly.defineBlocksWithJsonArray([{
+    "type": "stack_block",
+    "message0": "",
+    "previousStatement": null,
+    "nextStatement": null
+  },
+  {
+    "type": "row_block",
+    "message0": "%1",
+    "args0": [
+      {
+        "type": "input_value",
+        "name": "INPUT"
+      }
+    ],
+    "output": null,
+    "nextStatement": null
+  },
+  {
+    "type": "controls_repeat_ext",
+    "message0": "Repeat Loop",
+    "message1": "%1",
+    "args1": [{
+      "type": "input_statement",
+      "name": "DO"
+    }],
+    "previousStatement": null,
+    "nextStatement": null
+  }]);
+}
+
+function undefineGeneratorTestBlocks() {
+  delete Blockly.Blocks['stack_block'];
+  delete Blockly.Blocks['row_block'];
+}
+
+function generatorTest_setUp() {
+  defineGeneratorTestBlocks();
+  workspace = new Blockly.Workspace();
+}
+
+function generatorTest_tearDown() {
+  undefineGeneratorTestBlocks();
+  workspace.dispose();
+}
+
+function blockToCodeTestSetup(generator) {
+  var row_block = workspace.newBlock('row_block');
+  var stack_block = workspace.newBlock('stack_block');
+
+  generator.row_block = function(block){return 'row_block'};
+  generator.stack_block = function(block){return 'stack_block'};
+  row_block.nextConnection.connect(stack_block.previousConnection);
+  return row_block;
+}
+
+function blockToCodeTest(generator, opt_thisOnly) {
+  var row_block = blockToCodeTestSetup(generator);
+  return generator.blockToCode(row_block, opt_thisOnly);
+}
+
+function disabledBlockTest(generator, opt_thisOnly) {
+  var row_block = blockToCodeTestSetup(generator);
+  row_block.disabled=true;
+  return generator.blockToCode(row_block, opt_thisOnly);
+}
+
+function nestedLoopTest(generator, opt_thisOnly) {
+  Blockly.Msg['CONTROLS_REPEAT_TITLE'] = 'repeat %1 times';
+  var blockA = workspace.newBlock('controls_repeat_ext');
+  var blockB = workspace.newBlock('controls_repeat_ext');
+  var blockC = workspace.newBlock('controls_repeat_ext');
+  generator.controls_repeat_ext = getControlRepeatFunc(generator);
+
+  blockA.getInput('DO').connection.connect(blockB.previousConnection);
+  blockA.nextConnection.connect(blockC.previousConnection);
+  return generator.blockToCode(blockA, opt_thisOnly);
+}
+
+function getControlRepeatFunc(generator) {
+  return function(block){
+    return '{' +  generator.statementToCode(block, 'DO') + '}';
+  };
+}
+
+function test_blockToCodeOnAllGeneartors() {
+  generatorTest_setUp();
+
+  assertEquals(blockToCodeTest(Blockly.Dart, true), 'row_block');
+  assertEquals(blockToCodeTest(Blockly.Dart, false), 'row_blockstack_block');
+
+  assertEquals(blockToCodeTest(Blockly.JavaScript, true), 'row_block');
+  assertEquals(blockToCodeTest(Blockly.JavaScript, false), 'row_blockstack_block');
+
+  assertEquals(blockToCodeTest(Blockly.Lua, true), 'row_block');
+  assertEquals(blockToCodeTest(Blockly.Lua, false), 'row_blockstack_block');
+
+  assertEquals(blockToCodeTest(Blockly.PHP, true), 'row_block');
+  assertEquals(blockToCodeTest(Blockly.PHP, false), 'row_blockstack_block');
+
+  assertEquals(blockToCodeTest(Blockly.Python, true), 'row_block');
+  assertEquals(blockToCodeTest(Blockly.Python, false), 'row_blockstack_block');
+
+  generatorTest_tearDown();
+}
+
+function test_disabledBlockToCode() {
+  generatorTest_setUp();
+
+  assertEquals(disabledBlockTest(Blockly.Dart, true), '');
+  assertEquals(disabledBlockTest(Blockly.Dart, false), 'stack_block');
+
+  assertEquals(disabledBlockTest(Blockly.JavaScript, true), '');
+  assertEquals(disabledBlockTest(Blockly.JavaScript, false), 'stack_block');
+
+  assertEquals(disabledBlockTest(Blockly.Lua, true), '');
+  assertEquals(disabledBlockTest(Blockly.Lua, false), 'stack_block');
+
+  assertEquals(disabledBlockTest(Blockly.PHP, true), '');
+  assertEquals(disabledBlockTest(Blockly.PHP, false), 'stack_block');
+
+  assertEquals(disabledBlockTest(Blockly.Python, true), '');
+  assertEquals(disabledBlockTest(Blockly.Python, false), 'stack_block');
+
+  generatorTest_tearDown();
+}
+
+// {  {}} represents a nested block 
+//{  {}}{} represents a nested block with a block after it
+function test_nestedLoopBlockToCode() {
+  generatorTest_setUp();
+
+  assertEquals(nestedLoopTest(Blockly.Dart, true), '{  {}}');
+  assertEquals(nestedLoopTest(Blockly.Dart, false), '{  {}}{}');
+
+  assertEquals(nestedLoopTest(Blockly.JavaScript, true), '{  {}}');
+  assertEquals(nestedLoopTest(Blockly.JavaScript, false), '{  {}}{}');
+
+  assertEquals(nestedLoopTest(Blockly.Lua, true), '{  {}}');
+  assertEquals(nestedLoopTest(Blockly.Lua, false), '{  {}}{}');
+
+  assertEquals(nestedLoopTest(Blockly.PHP, true), '{  {}}');
+  assertEquals(nestedLoopTest(Blockly.PHP, false), '{  {}}{}');
+
+  assertEquals(nestedLoopTest(Blockly.Python, true), '{  {}}');
+  assertEquals(nestedLoopTest(Blockly.Python, false), '{  {}}{}');
+
+  generatorTest_tearDown();
+}
+
 function test_prefix() {
   var generator = new Blockly.Generator('INTERCAL');
   assertEquals('Prefix nothing.', '', generator.prefixLines('', ''));
   assertEquals('Prefix a word.', '@Hello', generator.prefixLines('Hello', '@'));
   assertEquals('Prefix one line.', '12Hello\n', generator.prefixLines('Hello\n', '12'));
   assertEquals('Prefix two lines.', '***Hello\n***World\n', generator.prefixLines('Hello\nWorld\n', '***'));
-}
+}
\ No newline at end of file
diff --git a/tests/jsunit/index.html b/tests/jsunit/index.html
index 82a1d2deb..c84375f88 100644
--- a/tests/jsunit/index.html
+++ b/tests/jsunit/index.html
@@ -4,6 +4,11 @@
     <meta charset="utf-8">
     <title>Unit Tests for Blockly</title>
     <script src="../../blockly_uncompressed.js"></script>
+    <script src="../../generators/dart.js"></script>
+    <script src="../../generators/javascript.js"></script>
+    <script src="../../generators/lua.js"></script>
+    <script src="../../generators/php.js"></script>
+    <script src="../../generators/python.js"></script>
     <script>goog.require('goog.testing.jsunit');</script>
   </head>
   <body>