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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 text blocks.
+ * @author fraser@google.com (Neil Fraser)
+ */
+'use strict';
+
+goog.provide('Blockly.JavaScript.texts');
+
+goog.require('Blockly.JavaScript');
+
+
+Blockly.JavaScript['text'] = function(block) {
+  // Text value.
+  var code = Blockly.JavaScript.quote_(block.getFieldValue('TEXT'));
+  return [code, Blockly.JavaScript.ORDER_ATOMIC];
+};
+
+Blockly.JavaScript['text_join'] = function(block) {
+  // Create a string made up of any number of elements of any type.
+  switch (block.itemCount_) {
+    case 0:
+      return ['\'\'', Blockly.JavaScript.ORDER_ATOMIC];
+    case 1:
+      var element = Blockly.JavaScript.valueToCode(block, 'ADD0',
+          Blockly.JavaScript.ORDER_NONE) || '\'\'';
+      var code = 'String(' + element + ')';
+      return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
+    case 2:
+      var element0 = Blockly.JavaScript.valueToCode(block, 'ADD0',
+          Blockly.JavaScript.ORDER_NONE) || '\'\'';
+      var element1 = Blockly.JavaScript.valueToCode(block, 'ADD1',
+          Blockly.JavaScript.ORDER_NONE) || '\'\'';
+      var code = 'String(' + element0 + ') + String(' + element1 + ')';
+      return [code, Blockly.JavaScript.ORDER_ADDITION];
+    default:
+      var elements = new Array(block.itemCount_);
+      for (var i = 0; i < block.itemCount_; i++) {
+        elements[i] = Blockly.JavaScript.valueToCode(block, 'ADD' + i,
+            Blockly.JavaScript.ORDER_COMMA) || '\'\'';
+      }
+      var code = '[' + elements.join(',') + '].join(\'\')';
+      return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
+  }
+};
+
+Blockly.JavaScript['text_append'] = function(block) {
+  // Append to a variable in place.
+  var varName = Blockly.JavaScript.variableDB_.getName(
+      block.getFieldValue('VAR'), Blockly.Variables.NAME_TYPE);
+  var value = Blockly.JavaScript.valueToCode(block, 'TEXT',
+      Blockly.JavaScript.ORDER_NONE) || '\'\'';
+  return varName + ' = String(' + varName + ') + String(' + value + ');\n';
+};
+
+Blockly.JavaScript['text_length'] = function(block) {
+  // String or array length.
+  var text = Blockly.JavaScript.valueToCode(block, 'VALUE',
+      Blockly.JavaScript.ORDER_FUNCTION_CALL) || '\'\'';
+  return [text + '.length', Blockly.JavaScript.ORDER_MEMBER];
+};
+
+Blockly.JavaScript['text_isEmpty'] = function(block) {
+  // Is the string null or array empty?
+  var text = Blockly.JavaScript.valueToCode(block, 'VALUE',
+      Blockly.JavaScript.ORDER_MEMBER) || '\'\'';
+  return ['!' + text + '.length', Blockly.JavaScript.ORDER_LOGICAL_NOT];
+};
+
+Blockly.JavaScript['text_indexOf'] = function(block) {
+  // Search the text for a substring.
+  var operator = block.getFieldValue('END') == 'FIRST' ?
+      'indexOf' : 'lastIndexOf';
+  var substring = Blockly.JavaScript.valueToCode(block, 'FIND',
+      Blockly.JavaScript.ORDER_NONE) || '\'\'';
+  var text = Blockly.JavaScript.valueToCode(block, 'VALUE',
+      Blockly.JavaScript.ORDER_MEMBER) || '\'\'';
+  var code = text + '.' + operator + '(' + substring + ')';
+  // Adjust index if using one-based indices.
+  if (Blockly.JavaScript.ONE_BASED_INDEXING) {
+    return [code + ' + 1', Blockly.JavaScript.ORDER_ADDITION];
+  }
+  return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
+};
+
+Blockly.JavaScript['text_charAt'] = function(block) {
+  // Get letter at index.
+  // Note: Until January 2013 this block did not have the WHERE input.
+  var where = block.getFieldValue('WHERE') || 'FROM_START';
+  var textOrder = (where == 'RANDOM') ? Blockly.JavaScript.ORDER_NONE :
+      Blockly.JavaScript.ORDER_MEMBER;
+  var text = Blockly.JavaScript.valueToCode(block, 'VALUE',
+      textOrder) || '\'\'';
+  switch (where) {
+    case 'FIRST':
+      var code = text + '.charAt(0)';
+      return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
+    case 'LAST':
+      var code = text + '.slice(-1)';
+      return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
+    case 'FROM_START':
+      var at = Blockly.JavaScript.getAdjusted(block, 'AT');
+      // Adjust index if using one-based indices.
+      var code = text + '.charAt(' + at + ')';
+      return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
+    case 'FROM_END':
+      var at = Blockly.JavaScript.getAdjusted(block, 'AT', 1, true);
+      var code = text + '.slice(' + at + ').charAt(0)';
+      return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
+    case 'RANDOM':
+      var functionName = Blockly.JavaScript.provideFunction_(
+          'textRandomLetter',
+          ['function ' + Blockly.JavaScript.FUNCTION_NAME_PLACEHOLDER_ +
+              '(text) {',
+           '  var x = Math.floor(Math.random() * text.length);',
+           '  return text[x];',
+           '}']);
+      var code = functionName + '(' + text + ')';
+      return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
+  }
+  throw 'Unhandled option (text_charAt).';
+};
+
+/**
+ * Returns an expression calculating the index into a string.
+ * @private
+ * @param {string} stringName Name of the string, used to calculate length.
+ * @param {string} where The method of indexing, selected by dropdown in Blockly
+ * @param {string=} opt_at The optional offset when indexing from start/end.
+ * @return {string} Index expression.
+ */
+Blockly.JavaScript.text.getIndex_ = function(stringName, where, opt_at) {
+  if (where == 'FIRST') {
+    return '0';
+  } else if (where == 'FROM_END') {
+    return stringName + '.length - 1 - ' + opt_at;
+  } else if (where == 'LAST') {
+    return stringName + '.length - 1';
+  } else {
+    return opt_at;
+  }
+};
+
+Blockly.JavaScript['text_getSubstring'] = function(block) {
+  // Get substring.
+  var text = Blockly.JavaScript.valueToCode(block, 'STRING',
+      Blockly.JavaScript.ORDER_FUNCTION_CALL) || '\'\'';
+  var where1 = block.getFieldValue('WHERE1');
+  var where2 = block.getFieldValue('WHERE2');
+  if (where1 == 'FIRST' && where2 == 'LAST') {
+    var code = text;
+  } else if (text.match(/^'?\w+'?$/) ||
+      (where1 != 'FROM_END' && where1 != 'LAST' &&
+      where2 != 'FROM_END' && where2 != 'LAST')) {
+    // If the text is a variable or literal or doesn't require a call for
+    // length, don't generate a helper function.
+    switch (where1) {
+      case 'FROM_START':
+        var at1 = Blockly.JavaScript.getAdjusted(block, 'AT1');
+        break;
+      case 'FROM_END':
+        var at1 = Blockly.JavaScript.getAdjusted(block, 'AT1', 1, false,
+            Blockly.JavaScript.ORDER_SUBTRACTION);
+        at1 = text + '.length - ' + at1;
+        break;
+      case 'FIRST':
+        var at1 = '0';
+        break;
+      default:
+        throw 'Unhandled option (text_getSubstring).';
+    }
+    switch (where2) {
+      case 'FROM_START':
+        var at2 = Blockly.JavaScript.getAdjusted(block, 'AT2', 1);
+        break;
+      case 'FROM_END':
+        var at2 = Blockly.JavaScript.getAdjusted(block, 'AT2', 0, false,
+            Blockly.JavaScript.ORDER_SUBTRACTION);
+        at2 = text + '.length - ' + at2;
+        break;
+      case 'LAST':
+        var at2 = text + '.length';
+        break;
+      default:
+        throw 'Unhandled option (text_getSubstring).';
+    }
+    code = text + '.slice(' + at1 + ', ' + at2 + ')';
+  } else {
+    var at1 = Blockly.JavaScript.getAdjusted(block, 'AT1');
+    var at2 = Blockly.JavaScript.getAdjusted(block, 'AT2');
+    var getIndex_ = Blockly.JavaScript.text.getIndex_;
+    var wherePascalCase = {'FIRST': 'First', 'LAST': 'Last',
+      'FROM_START': 'FromStart', 'FROM_END': 'FromEnd'};
+    var functionName = Blockly.JavaScript.provideFunction_(
+        'subsequence' + wherePascalCase[where1] + wherePascalCase[where2],
+        ['function ' + Blockly.JavaScript.FUNCTION_NAME_PLACEHOLDER_ +
+        '(sequence' +
+        // The value for 'FROM_END' and'FROM_START' depends on `at` so
+        // we add it as a parameter.
+        ((where1 == 'FROM_END' || where1 == 'FROM_START') ? ', at1' : '') +
+        ((where2 == 'FROM_END' || where2 == 'FROM_START') ? ', at2' : '') +
+        ') {',
+          '  var start = ' + getIndex_('sequence', where1, 'at1') + ';',
+          '  var end = ' + getIndex_('sequence', where2, 'at2') + ' + 1;',
+          '  return sequence.slice(start, end);',
+          '}']);
+    var code = functionName + '(' + text +
+        // The value for 'FROM_END' and 'FROM_START' depends on `at` so we
+        // pass it.
+        ((where1 == 'FROM_END' || where1 == 'FROM_START') ? ', ' + at1 : '') +
+        ((where2 == 'FROM_END' || where2 == 'FROM_START') ? ', ' + at2 : '') +
+        ')';
+  }
+  return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
+};
+
+Blockly.JavaScript['text_changeCase'] = function(block) {
+  // Change capitalization.
+  var OPERATORS = {
+    'UPPERCASE': '.toUpperCase()',
+    'LOWERCASE': '.toLowerCase()',
+    'TITLECASE': null
+  };
+  var operator = OPERATORS[block.getFieldValue('CASE')];
+  var textOrder = operator ? Blockly.JavaScript.ORDER_MEMBER :
+      Blockly.JavaScript.ORDER_NONE;
+  var text = Blockly.JavaScript.valueToCode(block, 'TEXT',
+      textOrder) || '\'\'';
+  if (operator) {
+    // Upper and lower case are functions built into JavaScript.
+    var code = text + operator;
+  } else {
+    // Title case is not a native JavaScript function.  Define one.
+    var functionName = Blockly.JavaScript.provideFunction_(
+        'textToTitleCase',
+        ['function ' + Blockly.JavaScript.FUNCTION_NAME_PLACEHOLDER_ +
+            '(str) {',
+         '  return str.replace(/\\S+/g,',
+         '      function(txt) {return txt[0].toUpperCase() + ' +
+            'txt.substring(1).toLowerCase();});',
+         '}']);
+    var code = functionName + '(' + text + ')';
+  }
+  return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
+};
+
+Blockly.JavaScript['text_trim'] = function(block) {
+  // Trim spaces.
+  var OPERATORS = {
+    'LEFT': ".replace(/^[\\s\\xa0]+/, '')",
+    'RIGHT': ".replace(/[\\s\\xa0]+$/, '')",
+    'BOTH': '.trim()'
+  };
+  var operator = OPERATORS[block.getFieldValue('MODE')];
+  var text = Blockly.JavaScript.valueToCode(block, 'TEXT',
+      Blockly.JavaScript.ORDER_MEMBER) || '\'\'';
+  return [text + operator, Blockly.JavaScript.ORDER_FUNCTION_CALL];
+};
+
+Blockly.JavaScript['text_print'] = function(block) {
+  // Print statement.
+  var msg = Blockly.JavaScript.valueToCode(block, 'TEXT',
+      Blockly.JavaScript.ORDER_NONE) || '\'\'';
+  return 'window.alert(' + msg + ');\n';
+};
+
+Blockly.JavaScript['text_prompt_ext'] = function(block) {
+  // Prompt function.
+  if (block.getField('TEXT')) {
+    // Internal message.
+    var msg = Blockly.JavaScript.quote_(block.getFieldValue('TEXT'));
+  } else {
+    // External message.
+    var msg = Blockly.JavaScript.valueToCode(block, 'TEXT',
+        Blockly.JavaScript.ORDER_NONE) || '\'\'';
+  }
+  var code = 'window.prompt(' + msg + ')';
+  var toNumber = block.getFieldValue('TYPE') == 'NUMBER';
+  if (toNumber) {
+    code = 'parseFloat(' + code + ')';
+  }
+  return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
+};
+
+Blockly.JavaScript['text_prompt'] = Blockly.JavaScript['text_prompt_ext'];