text: /**
   * @license Licensed under the Apache License, Version 2.0 (the "License"):
   *          http://www.apache.org/licenses/LICENSE-2.0
   */
  
  /**
   * @fileoverview Generating Arduino code for the logic blocks.
   */
  'use strict';
  
  goog.provide('Blockly.Arduino.logic');
  
  goog.require('Blockly.Arduino');
  
  
  /**
   * Code generator to create if/if else/else statement.
   * Arduino code: loop { if (X)/else if ()/else { X } }
   * @param {!Blockly.Block} block Block to generate the code from.
   * @return {string} Completed code.
   */
  Blockly.Arduino['controls_if'] = function(block) {
    var n = 0;
    var argument = Blockly.Arduino.valueToCode(block, 'IF' + n,
        Blockly.Arduino.ORDER_NONE) || 'false';
    var branch = Blockly.Arduino.statementToCode(block, 'DO' + n);
    var code = 'if (' + argument + ') {\n' + branch + '}';
    for (n = 1; n <= block.elseifCount_; n++) {
      argument = Blockly.Arduino.valueToCode(block, 'IF' + n,
          Blockly.Arduino.ORDER_NONE) || 'false';
      branch = Blockly.Arduino.statementToCode(block, 'DO' + n);
      code += ' else if (' + argument + ') {\n' + branch + '}';
    }
    if (block.elseCount_) {
      branch = Blockly.Arduino.statementToCode(block, 'ELSE');
      code += ' else {\n' + branch + '}';
    }
    return code + '\n';
  };
  
  /**
   * Code generator for the comparison operator block.
   * Arduino code: loop { X operator Y }
   * @param {!Blockly.Block} block Block to generate the code from.
   * @return {array} Completed code with order of operation.
   */
  Blockly.Arduino['logic_compare'] = function(block) {
    var OPERATORS = {
      'EQ': '==',
      'NEQ': '!=',
      'LT': '<',
      'LTE': '<=',
      'GT': '>',
      'GTE': '>='
    };
    var operator = OPERATORS[block.getFieldValue('OP')];
    var order = (operator == '==' || operator == '!=') ?
        Blockly.Arduino.ORDER_EQUALITY : Blockly.Arduino.ORDER_RELATIONAL;
    var argument0 = Blockly.Arduino.valueToCode(block, 'A', order) || '0';
    var argument1 = Blockly.Arduino.valueToCode(block, 'B', order) || '0';
    var code = argument0 + ' ' + operator + ' ' + argument1;
    return [code, order];
  };
  
  /**
   * Code generator for the logic operator block.
   * Arduino code: loop { X operator Y }
   * @param {!Blockly.Block} block Block to generate the code from.
   * @return {array} Completed code with order of operation.
   */
  Blockly.Arduino['logic_operation'] = function(block) {
    var operator = (block.getFieldValue('OP') == 'AND') ? '&&' : '||';
    var order = (operator == '&&') ? Blockly.Arduino.ORDER_LOGICAL_AND :
        Blockly.Arduino.ORDER_LOGICAL_OR;
    var argument0 = Blockly.Arduino.valueToCode(block, 'A', order) || 'false';
    var argument1 = Blockly.Arduino.valueToCode(block, 'B', order) || 'false';
    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];
  };
  
  /**
   * Code generator for the logic negate operator.
   * Arduino code: loop { !X }
   * @param {!Blockly.Block} block Block to generate the code from.
   * @return {array} Completed code with order of operation.
   */
  Blockly.Arduino['logic_negate'] = function(block) {
    var order = Blockly.Arduino.ORDER_UNARY_PREFIX;
    var argument0 = Blockly.Arduino.valueToCode(block, 'BOOL', order) || 'false';
    var code = '!' + argument0;
    return [code, order];
  };
  
  /**
   * Code generator for the boolean values true and false.
   * Arduino code: loop { true/false }
   * @param {!Blockly.Block} block Block to generate the code from.
   * @return {array} Completed code with order of operation.
   */
  Blockly.Arduino['logic_boolean'] = function(block) {
    var code = (block.getFieldValue('BOOL') == 'TRUE') ? 'true' : 'false';
    return [code, Blockly.Arduino.ORDER_ATOMIC];
  };
  
  /**
   * Code generator for the null value.
   * Arduino code: loop { X ? Y : Z }
   * @param {!Blockly.Block} block Block to generate the code from.
   * @return {array} Completed code with order of operation.
   */
  Blockly.Arduino['logic_null'] = function(block) {
    var code = 'NULL';
    return [code, Blockly.Arduino.ORDER_ATOMIC];
  };
  
  /**
   * Code generator for the ternary operator.
   * Arduino code: loop { NULL }
   * @param {!Blockly.Block} block Block to generate the code from.
   * @return {array} Completed code with order of operation.
   *
   * TODO: Check types of THEN and ELSE blocks and add warning to this block if
   *       they are different from each other.
   */
  Blockly.Arduino['logic_ternary'] = function(block) {
    var valueIf = Blockly.Arduino.valueToCode(block, 'IF',
        Blockly.Arduino.ORDER_CONDITIONAL) || 'false';
    var valueThen = Blockly.Arduino.valueToCode(block, 'THEN',
        Blockly.Arduino.ORDER_CONDITIONAL) || 'null';
    var valueElse = Blockly.Arduino.valueToCode(block, 'ELSE',
        Blockly.Arduino.ORDER_CONDITIONAL) || 'null';
    var code = valueIf + ' ? ' + valueThen + ' : ' + valueElse;
    return [code, Blockly.Arduino.ORDER_CONDITIONAL];
  };