text: /**
   * @license
   * Visual Blocks Editor
   *
   * 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 List blocks for Blockly.
   *
   * This file is scraped to extract a .json file of block definitions. The array
   * passed to defineBlocksWithJsonArray(..) must be strict JSON: double quotes
   * only, no outside references, no functions, no trailing commas, etc. The one
   * exception is end-of-line comments, which the scraper will remove.
   * @author fraser@google.com (Neil Fraser)
   */
  'use strict';
  
  goog.provide('Blockly.Constants.Lists');  // deprecated, 2018 April 5
  
  goog.require('Blockly.Blocks');
  goog.require('Blockly');
  
  goog.require('Blockly.PXTBlockly.Extensions');
  
  /**
   * Unused constant for the common HSV hue for all blocks in this category.
   * @deprecated Use Blockly.Msg.LISTS_HUE. (2018 April 5)
   */
  Blockly.Constants.Lists.HUE = 260;
  
  // 创建自命名数组
  Blockly.Blocks['lists_create_empty_arduino'] = 
  {
    /**
     * Block for creating a empty list.
     * @this Blockly.Block
     */
    init: function() 
    {
  	
      this.jsonInit({
        "message0": Blockly.Msg.LISTS_CREATE_EMPTY_TITLE + " %1 %2 %3 ",
  	  "args0": [
          {
          "type": "input_value",
          "name": "LIST",
          "check": "String"
  		},
  		{
            "type": "field_dropdown",
            "name": "TYPE",
            "options": [
              [Blockly.LANG_MATH_INT, "int"],
              [Blockly.LANG_MATH_LONG, "long"],
              [Blockly.LANG_MATH_FLOAT, "float"],
  			[Blockly.LANG_MATH_CHAR, "char"],
  			[Blockly.LANG_MATH_BYTE, "byte"],
  			[Blockly.LANG_MATH_STRING, "char *"]
            ]
          },
  		{
          "type": "input_value",
          "name": "NUM",
          "check": "Number"
  		},
        ],
  	  //"output": "String",
        "previousStatement": null,
        "nextStatement": null,
        "colour": Blockly.Msg.LISTS_HUE,
        "tooltip": Blockly.Msg.LISTS_CREATE_EMPTY_TOOLTIP,
        "helpUrl": Blockly.Msg.LISTS_CREATE_EMPTY_HELPURL
      })
    }
  };
  
  // 获取指定项数组的值
  Blockly.Blocks['lists_getIndex_arduino'] = 
  {
    /**
     * Block for get item from list.
     * @this Blockly.Block
     */
    init: function() 
    {
  	
      this.jsonInit({
        "message0": Blockly.Msg.LISTS_GET_INDEX_INPUT_IN_LIST + " %1 " + Blockly.Msg.LISTS_GET_INDEX_GET + " %2 ",
  	  "args0": [
          {
          "type": "input_value",
          "name": "LIST",
          "check": "String"
  		},
  		{
          "type": "input_value",
          "name": "NUM",
          "check": "Number"
  		},
        ],
  	  "output": "Array",
  	  "outputShape": Blockly.OUTPUT_SHAPE_ROUND,
        "colour": Blockly.Msg.LISTS_HUE,
        "tooltip": Blockly.Msg.LISTS_CREATE_EMPTY_TOOLTIP,
        "helpUrl": Blockly.Msg.LISTS_CREATE_EMPTY_HELPURL
      })
    }
  };
  
  // 设置指定项数组的值
  Blockly.Blocks['lists_setIndex_arduino'] = 
  {
    /**
     * Block for get item from list.
     * @this Blockly.Block
     */
    init: function() 
    {
  	
      this.jsonInit({
        "message0": Blockly.Msg.LISTS_SET_INDEX_INPUT_IN_LIST + " %1 " + Blockly.Msg.LISTS_SET_INDEX_SET + " %2 %3",
  	  "args0": [
          {
          "type": "input_value",
          "name": "LIST",
          "check": "String"
  		},
  		{
          "type": "input_value",
          "name": "NUM",
          "check": "Number"
  		},
  		{
          "type": "input_value",
          "name": "NUM2",
          "check": "Number"
  		}
        ],
  	  //"output": "Array",
  	  "previousStatement": null,
        "nextStatement": null,
  	  "outputShape": Blockly.OUTPUT_SHAPE_ROUND,
        "colour": Blockly.Msg.LISTS_HUE,
        "tooltip": Blockly.Msg.LISTS_CREATE_EMPTY_TOOLTIP,
        "helpUrl": Blockly.Msg.LISTS_CREATE_EMPTY_HELPURL
      })
    }
  };
  
  Blockly.defineBlocksWithJsonArray([  // BEGIN JSON EXTRACT
    // Block for creating an empty list
    // The 'list_create_with' block is preferred as it is more flexible.
    // <block type="lists_create_with">
    //   <mutation items="0"></mutation>
    // </block>
    {
      "type": "lists_create_empty",
      "message0": "%{BKY_LISTS_CREATE_EMPTY_TITLE}",
      "output": "Array",
      "outputShape": Blockly.OUTPUT_SHAPE_ROUND,
      "colour": "%{BKY_LISTS_HUE}",
      "tooltip": "%{BKY_LISTS_CREATE_EMPTY_TOOLTIP}",
      "helpUrl": "%{BKY_LISTS_CREATE_EMPTY_HELPURL}"
    },
    // Block for creating a list with one element repeated.
    {
      "type": "lists_repeat",
      "message0": "%{BKY_LISTS_REPEAT_TITLE}",
      "args0": [
        {
          "type": "input_value",
          "name": "ITEM"
        },
        {
          "type": "input_value",
          "name": "NUM",
          "check": "Number"
        }
      ],
      "output": "Array",
      "outputShape": Blockly.OUTPUT_SHAPE_ROUND,
      "colour": "%{BKY_LISTS_HUE}",
      "tooltip": "%{BKY_LISTS_REPEAT_TOOLTIP}",
      "helpUrl": "%{BKY_LISTS_REPEAT_HELPURL}"
    },
    // Block for reversing a list.
    {
      "type": "lists_reverse",
      "message0": "%{BKY_LISTS_REVERSE_MESSAGE0}",
      "args0": [
        {
          "type": "input_value",
          "name": "LIST",
          "check": "Array"
        }
      ],
      "output": "Array",
      "outputShape": Blockly.OUTPUT_SHAPE_ROUND,
      "inputsInline": true,
      "colour": "%{BKY_LISTS_HUE}",
      "tooltip": "%{BKY_LISTS_REVERSE_TOOLTIP}",
      "helpUrl": "%{BKY_LISTS_REVERSE_HELPURL}"
    },
    // Block for checking if a list is empty
    {
      "type": "lists_isEmpty",
      "message0": "%1 %{BKY_LISTS_ISEMPTY_TITLE}",
      "args0": [
        {
          "type": "input_value",
          "name": "VALUE",
          "check": ["String", "Array"]
        }
      ],
      "output": "Boolean",
      "outputShape": Blockly.OUTPUT_SHAPE_HEXAGONAL,
      "colour": "%{BKY_LISTS_HUE}",
      "tooltip": "%{BKY_LISTS_ISEMPTY_TOOLTIP}",
      "helpUrl": "%{BKY_LISTS_ISEMPTY_HELPURL}"
    },
    // Block for getting the list length
    {
      "type": "lists_length",
      "message0": "%{BKY_LISTS_LENGTH_TITLE} %1",
      "args0": [
        {
          "type": "input_value",
          "name": "VALUE",
          "check": ["String", "Array"]
        }
      ],
      "output": "Number",
      "outputShape": Blockly.OUTPUT_SHAPE_ROUND,
      "colour": "%{BKY_LISTS_HUE}",
      "tooltip": "%{BKY_LISTS_LENGTH_TOOLTIP}",
      "helpUrl": "%{BKY_LISTS_LENGTH_HELPURL}"
    }
  ]);  // END JSON EXTRACT (Do not delete this comment.)
  
  Blockly.Blocks['lists_create_with'] = {
    /**
     * Block for creating a list with any number of elements of any type.
     * @this Blockly.Block
     */
    init: function() {
      Blockly.Extensions.apply('inline-svgs', this, false);
      this.setHelpUrl(Blockly.Msg.LISTS_CREATE_WITH_HELPURL);
      this.setColour(Blockly.Msg.LISTS_HUE);
      this.itemCount_ = 3;
      this.updateShape_();
      this.setOutput(true, 'Array');
      this.setOutputShape(Blockly.OUTPUT_SHAPE_ROUND);
      this.setInputsInline(true);
      //this.setMutator(new Blockly.Mutator(['lists_create_with_item']));
      this.setTooltip(Blockly.Msg.LISTS_CREATE_WITH_TOOLTIP);
    },
    /**
     * Create XML to represent list inputs.
     * @return {!Element} XML storage element.
     * @this Blockly.Block
     */
    mutationToDom: function() {
      var container = document.createElement('mutation');
      container.setAttribute('items', this.itemCount_);
      return container;
    },
    /**
     * Parse XML to restore the list inputs.
     * @param {!Element} xmlElement XML storage element.
     * @this Blockly.Block
     */
    domToMutation: function(xmlElement) {
      this.itemCount_ = parseInt(xmlElement.getAttribute('items'), 10);
      this.updateShape_();
    },
    /**
     * Populate the mutator's dialog with this block's components.
     * @param {!Blockly.Workspace} workspace Mutator's workspace.
     * @return {!Blockly.Block} Root block in mutator.
     * @this Blockly.Block
     */
    // pxtblockly: Removing the cogwheel for array with
    // decompose: function(workspace) {
    //   var containerBlock = workspace.newBlock('lists_create_with_container');
    //   containerBlock.initSvg();
    //   var connection = containerBlock.getInput('STACK').connection;
    //   for (var i = 0; i < this.itemCount_; i++) {
    //     var itemBlock = workspace.newBlock('lists_create_with_item');
    //     itemBlock.initSvg();
    //     connection.connect(itemBlock.previousConnection);
    //     connection = itemBlock.nextConnection;
    //   }
    //   return containerBlock;
    // },
    /**
     * Reconfigure this block based on the mutator dialog's components.
     * @param {!Blockly.Block} containerBlock Root block in mutator.
     * @this Blockly.Block
     */
    // pxtblockly: Removing the cogwheel for array with
    // compose: function(containerBlock) {
    //   var itemBlock = containerBlock.getInputTargetBlock('STACK');
    //   // Count number of inputs.
    //   var connections = [];
    //   while (itemBlock) {
    //     connections.push(itemBlock.valueConnection_);
    //     itemBlock = itemBlock.nextConnection &&
    //         itemBlock.nextConnection.targetBlock();
    //   }
    //   // Disconnect any children that don't belong.
    //   for (var i = 0; i < this.itemCount_; i++) {
    //     var connection = this.getInput('ADD' + i).connection.targetConnection;
    //     if (connection && connections.indexOf(connection) == -1) {
    //       connection.disconnect();
    //     }
    //   }
    //   this.itemCount_ = connections.length;
    //   this.updateShape_();
    //   // Reconnect any child blocks.
    //   for (var i = 0; i < this.itemCount_; i++) {
    //     Blockly.Mutator.reconnect(connections[i], this, 'ADD' + i);
    //   }
    // },
    /**
     * Store pointers to any connected child blocks.
     * @param {!Blockly.Block} containerBlock Root block in mutator.
     * @this Blockly.Block
     */
    // saveConnections: function(containerBlock) {
    //   var itemBlock = containerBlock.getInputTargetBlock('STACK');
    //   var i = 0;
    //   while (itemBlock) {
    //     var input = this.getInput('ADD' + i);
    //     itemBlock.valueConnection_ = input && input.connection.targetConnection;
    //     i++;
    //     itemBlock = itemBlock.nextConnection &&
    //         itemBlock.nextConnection.targetBlock();
    //   }
    // },
    /**
     * Store pointers to any connected child blocks.
     */
    storeConnections_: function() {
      this.valueConnections_ = [];
      for (var i = 0; i < this.itemCount_; i++) {
        this.valueConnections_.push(this.getInput('ADD' + i).connection.targetConnection);
      }
    },
    restoreConnections_: function() {
      for (var i = 0; i < this.itemCount_; i++) {
        Blockly.Mutator.reconnect(this.valueConnections_[i], this, 'ADD' + i);
      }
    },
    addItem_: function() {
      this.storeConnections_();
      var update = function() {
        this.itemCount_++;
      };
      this.update_(update);
      this.restoreConnections_();
      // Add shadow block
      if (this.itemCount_ > 1) {
        // Find shadow type
        var firstInput = this.getInput('ADD' + 0);
        if (firstInput && firstInput.connection.targetConnection) {
          // Create a new shadow DOM with the same type as the first input
          // but with an empty default value
          var newInput = this.getInput('ADD' + (this.itemCount_ - 1));
          var shadowInputDom = firstInput.connection.getShadowDom();
          if (shadowInputDom) {
            var shadowDom = document.createElement('shadow');
            var shadowInputType = shadowInputDom.getAttribute('type');
            shadowDom.setAttribute('type', shadowInputType);
            var shadowDomField = document.createElement('field');
            shadowDomField.setAttribute('name', 'NUM');
            shadowDom.appendChild(shadowDomField);
            if (shadowDom) {
              shadowDom.setAttribute('id', Blockly.utils.genUid());
              newInput.connection.setShadowDom(shadowDom);
              newInput.connection.respawnShadow_();
            }
          }
        }
      }
    },
    removeItem_: function() {
      this.storeConnections_();
      var update = function() {
        this.itemCount_--;
      };
      this.update_(update);
      this.restoreConnections_();
    },
    update_: function(update) {
      Blockly.Events.setGroup(true);
      var block = this;
      var oldMutationDom = block.mutationToDom();
      var oldMutation = oldMutationDom && Blockly.Xml.domToText(oldMutationDom);
      // Switch off rendering while the source block is rebuilt.
      var savedRendered = block.rendered;
      block.rendered = false;
      // Update the mutation
      if (update) update.call(this);
      // Allow the source block to rebuild itself.
      this.updateShape_();
      // Restore rendering and show the changes.
      block.rendered = savedRendered;
      // Mutation may have added some elements that need initializing.
      block.initSvg();
      // Ensure that any bump is part of this mutation's event group.
      var group = Blockly.Events.getGroup();
      var newMutationDom = block.mutationToDom();
      var newMutation = newMutationDom && Blockly.Xml.domToText(newMutationDom);
      if (oldMutation != newMutation) {
        Blockly.Events.fire(new Blockly.Events.BlockChange(
            block, 'mutation', null, oldMutation, newMutation));
        setTimeout(function() {
          Blockly.Events.setGroup(group);
          block.bumpNeighbours_();
          Blockly.Events.setGroup(false);
        }, Blockly.BUMP_DELAY);
      }
      if (block.rendered) {
        block.render();
      }
      Blockly.Events.setGroup(false);
    },
    /**
     * Modify this block to have the correct number of inputs.
     * @private
     * @this Blockly.Block
     */
    updateShape_: function() {
      var that = this;
      var add = function() {
        that.addItem_();
      };
      var remove = function() {
        that.removeItem_();
      };
      if (this.itemCount_) {
        if (this.getInput('EMPTY')) this.removeInput('EMPTY');
        if (!this.getInput('TITLE')) {
          this.appendDummyInput('TITLE')
              .appendField(Blockly.Msg.LISTS_CREATE_WITH_INPUT_WITH);
        }
      } else {
        if (this.getInput('TITLE')) this.removeInput('TITLE');
        if (!this.getInput('EMPTY')) {
          this.appendDummyInput('EMPTY')
              .appendField(Blockly.Msg.LISTS_CREATE_EMPTY_TITLE);
        }
      }
      var i = 0;
      // Add new inputs.
      for (i = 0; i < this.itemCount_; i++) {
        if (!this.getInput('ADD' + i)) {
          this.appendValueInput('ADD' + i);
        }
      }
      // Remove deleted inputs.
      while (this.getInput('ADD' + i)) {
        this.removeInput('ADD' + i);
        i++;
      }
      if (this.getInput('BUTTONS')) this.removeInput('BUTTONS');
      var buttons = this.appendDummyInput('BUTTONS');
      if (this.itemCount_ > 0) {
        buttons.appendField(new Blockly.FieldImage(this.REMOVE_IMAGE_DATAURI, 24, 24, false, "*", remove));
      }
      buttons.appendField(new Blockly.FieldImage(this.ADD_IMAGE_DATAURI, 24, 24, false, "*", add));
  
      /* Switch to vertical list when the list is too long */
      var showHorizontalList = this.itemCount_ <= 5;
      this.setInputsInline(showHorizontalList);
      this.setOutputShape(showHorizontalList ?
        Blockly.OUTPUT_SHAPE_ROUND : Blockly.OUTPUT_SHAPE_SQUARE);
    }
  };
  
  Blockly.Blocks['lists_create_with_container'] = {
    /**
     * Mutator block for list container.
     * @this Blockly.Block
     */
    init: function() {
      this.setColour(Blockly.Msg.LISTS_HUE);
      this.appendDummyInput()
          .appendField(Blockly.Msg.LISTS_CREATE_WITH_CONTAINER_TITLE_ADD);
      this.appendStatementInput('STACK');
      this.setTooltip(Blockly.Msg.LISTS_CREATE_WITH_CONTAINER_TOOLTIP);
      this.contextMenu = false;
    }
  };
  
  Blockly.Blocks['lists_create_with_item'] = {
    /**
     * Mutator block for adding items.
     * @this Blockly.Block
     */
    init: function() {
      this.setColour(Blockly.Msg.LISTS_HUE);
      this.appendDummyInput()
          .appendField(Blockly.Msg.LISTS_CREATE_WITH_ITEM_TITLE);
      this.setPreviousStatement(true);
      this.setNextStatement(true);
      this.setTooltip(Blockly.Msg.LISTS_CREATE_WITH_ITEM_TOOLTIP);
      this.contextMenu = false;
    }
  };
  
  Blockly.Blocks['lists_indexOf'] = {
    /**
     * Block for finding an item in the list.
     * @this Blockly.Block
     */
    init: function() {
      var OPERATORS =
          [
            [Blockly.Msg.LISTS_INDEX_OF_FIRST, 'FIRST'],
            [Blockly.Msg.LISTS_INDEX_OF_LAST, 'LAST']
          ];
      this.setHelpUrl(Blockly.Msg.LISTS_INDEX_OF_HELPURL);
      this.setColour(Blockly.Msg.LISTS_HUE);
      this.setOutput(true, 'Number');
      this.setOutputShape(Blockly.OUTPUT_SHAPE_ROUND);
      this.appendValueInput('VALUE')
          .setCheck('Array')
          .appendField(Blockly.Msg.LISTS_INDEX_OF_INPUT_IN_LIST);
      this.appendValueInput('FIND')
          .appendField(new Blockly.FieldDropdown(OPERATORS), 'END');
      this.setInputsInline(true);
      // Assign 'this' to a variable for use in the tooltip closure below.
      var thisBlock = this;
      this.setTooltip(function() {
        return Blockly.Msg.LISTS_INDEX_OF_TOOLTIP.replace('%1',
            thisBlock.workspace.options.oneBasedIndex ? '0' : '-1');
      });
    }
  };
  
  Blockly.Blocks['lists_getIndex'] = {
    /**
     * Block for getting element at index.
     * @this Blockly.Block
     */
    init: function() {
      var MODE =
          [
            [Blockly.Msg.LISTS_GET_INDEX_GET, 'GET'],
            [Blockly.Msg.LISTS_GET_INDEX_GET_REMOVE, 'GET_REMOVE'],
            [Blockly.Msg.LISTS_GET_INDEX_REMOVE, 'REMOVE']
          ];
      this.WHERE_OPTIONS =
          [
            [Blockly.Msg.LISTS_GET_INDEX_FROM_START, 'FROM_START'],
            [Blockly.Msg.LISTS_GET_INDEX_FROM_END, 'FROM_END'],
            [Blockly.Msg.LISTS_GET_INDEX_FIRST, 'FIRST'],
            [Blockly.Msg.LISTS_GET_INDEX_LAST, 'LAST'],
            [Blockly.Msg.LISTS_GET_INDEX_RANDOM, 'RANDOM']
          ];
      this.setHelpUrl(Blockly.Msg.LISTS_GET_INDEX_HELPURL);
      this.setColour(Blockly.Msg.LISTS_HUE);
      this.setOutputShape(Blockly.OUTPUT_SHAPE_ROUND);
      var modeMenu = new Blockly.FieldDropdown(MODE, function(value) {
        var isStatement = (value == 'REMOVE');
        this.sourceBlock_.updateStatement_(isStatement);
      });
      this.appendValueInput('VALUE')
          .setCheck('Array')
          .appendField(Blockly.Msg.LISTS_GET_INDEX_INPUT_IN_LIST);
      this.appendDummyInput()
          .appendField(modeMenu, 'MODE')
          .appendField('', 'SPACE');
      this.appendDummyInput('AT');
      if (Blockly.Msg.LISTS_GET_INDEX_TAIL) {
        this.appendDummyInput('TAIL')
            .appendField(Blockly.Msg.LISTS_GET_INDEX_TAIL);
      }
      this.setInputsInline(true);
      this.setOutput(true);
      this.updateAt_(true);
      // Assign 'this' to a variable for use in the tooltip closure below.
      var thisBlock = this;
      this.setTooltip(function() {
        var mode = thisBlock.getFieldValue('MODE');
        var where = thisBlock.getFieldValue('WHERE');
        var tooltip = '';
        switch (mode + ' ' + where) {
          case 'GET FROM_START':
          case 'GET FROM_END':
            tooltip = Blockly.Msg.LISTS_GET_INDEX_TOOLTIP_GET_FROM;
            break;
          case 'GET FIRST':
            tooltip = Blockly.Msg.LISTS_GET_INDEX_TOOLTIP_GET_FIRST;
            break;
          case 'GET LAST':
            tooltip = Blockly.Msg.LISTS_GET_INDEX_TOOLTIP_GET_LAST;
            break;
          case 'GET RANDOM':
            tooltip = Blockly.Msg.LISTS_GET_INDEX_TOOLTIP_GET_RANDOM;
            break;
          case 'GET_REMOVE FROM_START':
          case 'GET_REMOVE FROM_END':
            tooltip = Blockly.Msg.LISTS_GET_INDEX_TOOLTIP_GET_REMOVE_FROM;
            break;
          case 'GET_REMOVE FIRST':
            tooltip = Blockly.Msg.LISTS_GET_INDEX_TOOLTIP_GET_REMOVE_FIRST;
            break;
          case 'GET_REMOVE LAST':
            tooltip = Blockly.Msg.LISTS_GET_INDEX_TOOLTIP_GET_REMOVE_LAST;
            break;
          case 'GET_REMOVE RANDOM':
            tooltip = Blockly.Msg.LISTS_GET_INDEX_TOOLTIP_GET_REMOVE_RANDOM;
            break;
          case 'REMOVE FROM_START':
          case 'REMOVE FROM_END':
            tooltip = Blockly.Msg.LISTS_GET_INDEX_TOOLTIP_REMOVE_FROM;
            break;
          case 'REMOVE FIRST':
            tooltip = Blockly.Msg.LISTS_GET_INDEX_TOOLTIP_REMOVE_FIRST;
            break;
          case 'REMOVE LAST':
            tooltip = Blockly.Msg.LISTS_GET_INDEX_TOOLTIP_REMOVE_LAST;
            break;
          case 'REMOVE RANDOM':
            tooltip = Blockly.Msg.LISTS_GET_INDEX_TOOLTIP_REMOVE_RANDOM;
            break;
        }
        if (where == 'FROM_START' || where == 'FROM_END') {
          var msg = (where == 'FROM_START') ?
              Blockly.Msg.LISTS_INDEX_FROM_START_TOOLTIP :
              Blockly.Msg.LISTS_INDEX_FROM_END_TOOLTIP;
          tooltip += '  ' + msg.replace('%1',
                  thisBlock.workspace.options.oneBasedIndex ? '#1' : '#0');
        }
        return tooltip;
      });
    },
    /**
     * Create XML to represent whether the block is a statement or a value.
     * Also represent whether there is an 'AT' input.
     * @return {Element} XML storage element.
     * @this Blockly.Block
     */
    mutationToDom: function() {
      var container = document.createElement('mutation');
      var isStatement = !this.outputConnection;
      container.setAttribute('statement', isStatement);
      var isAt = this.getInput('AT').type == Blockly.INPUT_VALUE;
      container.setAttribute('at', isAt);
      return container;
    },
    /**
     * Parse XML to restore the 'AT' input.
     * @param {!Element} xmlElement XML storage element.
     * @this Blockly.Block
     */
    domToMutation: function(xmlElement) {
      // Note: Until January 2013 this block did not have mutations,
      // so 'statement' defaults to false and 'at' defaults to true.
      var isStatement = (xmlElement.getAttribute('statement') == 'true');
      this.updateStatement_(isStatement);
      var isAt = (xmlElement.getAttribute('at') != 'false');
      this.updateAt_(isAt);
    },
    /**
     * Switch between a value block and a statement block.
     * @param {boolean} newStatement True if the block should be a statement.
     *     False if the block should be a value.
     * @private
     * @this Blockly.Block
     */
    updateStatement_: function(newStatement) {
      var oldStatement = !this.outputConnection;
      if (newStatement != oldStatement) {
        this.unplug(true, true);
        if (newStatement) {
          this.setOutput(false);
          this.setPreviousStatement(true);
          this.setNextStatement(true);
        } else {
          this.setPreviousStatement(false);
          this.setNextStatement(false);
          this.setOutput(true);
        }
      }
    },
    /**
     * Create or delete an input for the numeric index.
     * @param {boolean} isAt True if the input should exist.
     * @private
     * @this Blockly.Block
     */
    updateAt_: function(isAt) {
      // Destroy old 'AT' and 'ORDINAL' inputs.
      this.removeInput('AT');
      this.removeInput('ORDINAL', true);
      // Create either a value 'AT' input or a dummy input.
      if (isAt) {
        this.appendValueInput('AT').setCheck('Number');
        if (Blockly.Msg.ORDINAL_NUMBER_SUFFIX) {
          this.appendDummyInput('ORDINAL')
              .appendField(Blockly.Msg.ORDINAL_NUMBER_SUFFIX);
        }
      } else {
        this.appendDummyInput('AT');
      }
      var menu = new Blockly.FieldDropdown(this.WHERE_OPTIONS, function(value) {
        var newAt = (value == 'FROM_START') || (value == 'FROM_END');
        // The 'isAt' variable is available due to this function being a closure.
        if (newAt != isAt) {
          var block = this.sourceBlock_;
          block.updateAt_(newAt);
          // This menu has been destroyed and replaced.  Update the replacement.
          block.setFieldValue(value, 'WHERE');
          return null;
        }
        return undefined;
      });
      this.getInput('AT').appendField(menu, 'WHERE');
      if (Blockly.Msg.LISTS_GET_INDEX_TAIL) {
        this.moveInputBefore('TAIL', null);
      }
    }
  };
  
  Blockly.Blocks['lists_setIndex'] = {
    /**
     * Block for setting the element at index.
     * @this Blockly.Block
     */
    init: function() {
      var MODE =
          [
            [Blockly.Msg.LISTS_SET_INDEX_SET, 'SET'],
            [Blockly.Msg.LISTS_SET_INDEX_INSERT, 'INSERT']
          ];
      this.WHERE_OPTIONS =
          [
            [Blockly.Msg.LISTS_GET_INDEX_FROM_START, 'FROM_START'],
            [Blockly.Msg.LISTS_GET_INDEX_FROM_END, 'FROM_END'],
            [Blockly.Msg.LISTS_GET_INDEX_FIRST, 'FIRST'],
            [Blockly.Msg.LISTS_GET_INDEX_LAST, 'LAST'],
            [Blockly.Msg.LISTS_GET_INDEX_RANDOM, 'RANDOM']
          ];
      this.setHelpUrl(Blockly.Msg.LISTS_SET_INDEX_HELPURL);
      this.setColour(Blockly.Msg.LISTS_HUE);
      this.appendValueInput('LIST')
          .setCheck('Array')
          .appendField(Blockly.Msg.LISTS_SET_INDEX_INPUT_IN_LIST);
      this.appendDummyInput()
          .appendField(new Blockly.FieldDropdown(MODE), 'MODE')
          .appendField('', 'SPACE');
      this.appendDummyInput('AT');
      this.appendValueInput('TO')
          .appendField(Blockly.Msg.LISTS_SET_INDEX_INPUT_TO);
      this.setInputsInline(true);
      this.setPreviousStatement(true);
      this.setNextStatement(true);
      this.setTooltip(Blockly.Msg.LISTS_SET_INDEX_TOOLTIP);
      this.updateAt_(true);
      // Assign 'this' to a variable for use in the tooltip closure below.
      var thisBlock = this;
      this.setTooltip(function() {
        var mode = thisBlock.getFieldValue('MODE');
        var where = thisBlock.getFieldValue('WHERE');
        var tooltip = '';
        switch (mode + ' ' + where) {
          case 'SET FROM_START':
          case 'SET FROM_END':
            tooltip = Blockly.Msg.LISTS_SET_INDEX_TOOLTIP_SET_FROM;
            break;
          case 'SET FIRST':
            tooltip = Blockly.Msg.LISTS_SET_INDEX_TOOLTIP_SET_FIRST;
            break;
          case 'SET LAST':
            tooltip = Blockly.Msg.LISTS_SET_INDEX_TOOLTIP_SET_LAST;
            break;
          case 'SET RANDOM':
            tooltip = Blockly.Msg.LISTS_SET_INDEX_TOOLTIP_SET_RANDOM;
            break;
          case 'INSERT FROM_START':
          case 'INSERT FROM_END':
            tooltip = Blockly.Msg.LISTS_SET_INDEX_TOOLTIP_INSERT_FROM;
            break;
          case 'INSERT FIRST':
            tooltip = Blockly.Msg.LISTS_SET_INDEX_TOOLTIP_INSERT_FIRST;
            break;
          case 'INSERT LAST':
            tooltip = Blockly.Msg.LISTS_SET_INDEX_TOOLTIP_INSERT_LAST;
            break;
          case 'INSERT RANDOM':
            tooltip = Blockly.Msg.LISTS_SET_INDEX_TOOLTIP_INSERT_RANDOM;
            break;
        }
        if (where == 'FROM_START' || where == 'FROM_END') {
          tooltip += '  ' + Blockly.Msg.LISTS_INDEX_FROM_START_TOOLTIP
              .replace('%1',
                  thisBlock.workspace.options.oneBasedIndex ? '#1' : '#0');
        }
        return tooltip;
      });
    },
    /**
     * Create XML to represent whether there is an 'AT' input.
     * @return {Element} XML storage element.
     * @this Blockly.Block
     */
    mutationToDom: function() {
      var container = document.createElement('mutation');
      var isAt = this.getInput('AT').type == Blockly.INPUT_VALUE;
      container.setAttribute('at', isAt);
      return container;
    },
    /**
     * Parse XML to restore the 'AT' input.
     * @param {!Element} xmlElement XML storage element.
     * @this Blockly.Block
     */
    domToMutation: function(xmlElement) {
      // Note: Until January 2013 this block did not have mutations,
      // so 'at' defaults to true.
      var isAt = (xmlElement.getAttribute('at') != 'false');
      this.updateAt_(isAt);
    },
    /**
     * Create or delete an input for the numeric index.
     * @param {boolean} isAt True if the input should exist.
     * @private
     * @this Blockly.Block
     */
    updateAt_: function(isAt) {
      // Destroy old 'AT' and 'ORDINAL' input.
      this.removeInput('AT');
      this.removeInput('ORDINAL', true);
      // Create either a value 'AT' input or a dummy input.
      if (isAt) {
        this.appendValueInput('AT').setCheck('Number');
        if (Blockly.Msg.ORDINAL_NUMBER_SUFFIX) {
          this.appendDummyInput('ORDINAL')
              .appendField(Blockly.Msg.ORDINAL_NUMBER_SUFFIX);
        }
      } else {
        this.appendDummyInput('AT');
      }
      var menu = new Blockly.FieldDropdown(this.WHERE_OPTIONS, function(value) {
        var newAt = (value == 'FROM_START') || (value == 'FROM_END');
        // The 'isAt' variable is available due to this function being a closure.
        if (newAt != isAt) {
          var block = this.sourceBlock_;
          block.updateAt_(newAt);
          // This menu has been destroyed and replaced.  Update the replacement.
          block.setFieldValue(value, 'WHERE');
          return null;
        }
        return undefined;
      });
      this.moveInputBefore('AT', 'TO');
      if (this.getInput('ORDINAL')) {
        this.moveInputBefore('ORDINAL', 'TO');
      }
  
      this.getInput('AT').appendField(menu, 'WHERE');
    }
  };
  
  Blockly.Blocks['lists_getSublist'] = {
    /**
     * Block for getting sublist.
     * @this Blockly.Block
     */
    init: function() {
      this['WHERE_OPTIONS_1'] =
          [
            [Blockly.Msg.LISTS_GET_SUBLIST_START_FROM_START, 'FROM_START'],
            [Blockly.Msg.LISTS_GET_SUBLIST_START_FROM_END, 'FROM_END'],
            [Blockly.Msg.LISTS_GET_SUBLIST_START_FIRST, 'FIRST']
          ];
      this['WHERE_OPTIONS_2'] =
          [
            [Blockly.Msg.LISTS_GET_SUBLIST_END_FROM_START, 'FROM_START'],
            [Blockly.Msg.LISTS_GET_SUBLIST_END_FROM_END, 'FROM_END'],
            [Blockly.Msg.LISTS_GET_SUBLIST_END_LAST, 'LAST']
          ];
      this.setHelpUrl(Blockly.Msg.LISTS_GET_SUBLIST_HELPURL);
      this.setColour(Blockly.Msg.LISTS_HUE);
      this.appendValueInput('LIST')
          .setCheck('Array')
          .appendField(Blockly.Msg.LISTS_GET_SUBLIST_INPUT_IN_LIST);
      this.appendDummyInput('AT1');
      this.appendDummyInput('AT2');
      if (Blockly.Msg.LISTS_GET_SUBLIST_TAIL) {
        this.appendDummyInput('TAIL')
            .appendField(Blockly.Msg.LISTS_GET_SUBLIST_TAIL);
      }
      this.setInputsInline(true);
      this.setOutput(true, 'Array');
      this.setOutputShape(Blockly.OUTPUT_SHAPE_ROUND);
      this.updateAt_(1, true);
      this.updateAt_(2, true);
      this.setTooltip(Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP);
    },
    /**
     * Create XML to represent whether there are 'AT' inputs.
     * @return {Element} XML storage element.
     * @this Blockly.Block
     */
    mutationToDom: function() {
      var container = document.createElement('mutation');
      var isAt1 = this.getInput('AT1').type == Blockly.INPUT_VALUE;
      container.setAttribute('at1', isAt1);
      var isAt2 = this.getInput('AT2').type == Blockly.INPUT_VALUE;
      container.setAttribute('at2', isAt2);
      return container;
    },
    /**
     * Parse XML to restore the 'AT' inputs.
     * @param {!Element} xmlElement XML storage element.
     * @this Blockly.Block
     */
    domToMutation: function(xmlElement) {
      var isAt1 = (xmlElement.getAttribute('at1') == 'true');
      var isAt2 = (xmlElement.getAttribute('at2') == 'true');
      this.updateAt_(1, isAt1);
      this.updateAt_(2, isAt2);
    },
    /**
     * Create or delete an input for a numeric index.
     * This block has two such inputs, independant of each other.
     * @param {number} n Specify first or second input (1 or 2).
     * @param {boolean} isAt True if the input should exist.
     * @private
     * @this Blockly.Block
     */
    updateAt_: function(n, isAt) {
      // Create or delete an input for the numeric index.
      // Destroy old 'AT' and 'ORDINAL' inputs.
      this.removeInput('AT' + n);
      this.removeInput('ORDINAL' + n, true);
      // Create either a value 'AT' input or a dummy input.
      if (isAt) {
        this.appendValueInput('AT' + n).setCheck('Number');
        if (Blockly.Msg.ORDINAL_NUMBER_SUFFIX) {
          this.appendDummyInput('ORDINAL' + n)
              .appendField(Blockly.Msg.ORDINAL_NUMBER_SUFFIX);
        }
      } else {
        this.appendDummyInput('AT' + n);
      }
      var menu = new Blockly.FieldDropdown(this['WHERE_OPTIONS_' + n],
          function(value) {
            var newAt = (value == 'FROM_START') || (value == 'FROM_END');
            // The 'isAt' variable is available due to this function being a
            // closure.
            if (newAt != isAt) {
              var block = this.sourceBlock_;
              block.updateAt_(n, newAt);
              // This menu has been destroyed and replaced.
              // Update the replacement.
              block.setFieldValue(value, 'WHERE' + n);
              return null;
            }
            return undefined;
          });
      this.getInput('AT' + n)
          .appendField(menu, 'WHERE' + n);
      if (n == 1) {
        this.moveInputBefore('AT1', 'AT2');
        if (this.getInput('ORDINAL1')) {
          this.moveInputBefore('ORDINAL1', 'AT2');
        }
      }
      if (Blockly.Msg.LISTS_GET_SUBLIST_TAIL) {
        this.moveInputBefore('TAIL', null);
      }
    }
  };
  
  Blockly.Blocks['lists_sort'] = {
    /**
     * Block for sorting a list.
     * @this Blockly.Block
     */
    init: function() {
      this.jsonInit({
        "message0": Blockly.Msg.LISTS_SORT_TITLE,
        "args0": [
          {
            "type": "field_dropdown",
            "name": "TYPE",
            "options": [
              [Blockly.Msg.LISTS_SORT_TYPE_NUMERIC, "NUMERIC"],
              [Blockly.Msg.LISTS_SORT_TYPE_TEXT, "TEXT"],
              [Blockly.Msg.LISTS_SORT_TYPE_IGNORECASE, "IGNORE_CASE"]
            ]
          },
          {
            "type": "field_dropdown",
            "name": "DIRECTION",
            "options": [
              [Blockly.Msg.LISTS_SORT_ORDER_ASCENDING, "1"],
              [Blockly.Msg.LISTS_SORT_ORDER_DESCENDING, "-1"]
            ]
          },
          {
            "type": "input_value",
            "name": "LIST",
            "check": "Array"
          }
        ],
        "output": "Array",
        "outputShape": Blockly.OUTPUT_SHAPE_ROUND,
        "colour": Blockly.Msg.LISTS_HUE,
        "tooltip": Blockly.Msg.LISTS_SORT_TOOLTIP,
        "helpUrl": Blockly.Msg.LISTS_SORT_HELPURL
      });
    }
  };
  
  Blockly.Blocks['lists_split'] = {
    /**
     * Block for splitting text into a list, or joining a list into text.
     * @this Blockly.Block
     */
    init: function() {
      // Assign 'this' to a variable for use in the closures below.
      var thisBlock = this;
      var dropdown = new Blockly.FieldDropdown(
          [
            [Blockly.Msg.LISTS_SPLIT_LIST_FROM_TEXT, 'SPLIT'],
            [Blockly.Msg.LISTS_SPLIT_TEXT_FROM_LIST, 'JOIN']
          ],
          function(newMode) {
            thisBlock.updateType_(newMode);
          });
      this.setHelpUrl(Blockly.Msg.LISTS_SPLIT_HELPURL);
      this.setColour(Blockly.Msg.LISTS_HUE);
      this.appendValueInput('INPUT')
          .setCheck('String')
          .appendField(dropdown, 'MODE');
      this.appendValueInput('DELIM')
          .setCheck('String')
          .appendField(Blockly.Msg.LISTS_SPLIT_WITH_DELIMITER);
      this.setInputsInline(true);
      this.setOutput(true, 'Array');
      this.setOutputShape(Blockly.OUTPUT_SHAPE_ROUND);
      this.setTooltip(function() {
        var mode = thisBlock.getFieldValue('MODE');
        if (mode == 'SPLIT') {
          return Blockly.Msg.LISTS_SPLIT_TOOLTIP_SPLIT;
        } else if (mode == 'JOIN') {
          return Blockly.Msg.LISTS_SPLIT_TOOLTIP_JOIN;
        }
        throw 'Unknown mode: ' + mode;
      });
    },
    /**
     * Modify this block to have the correct input and output types.
     * @param {string} newMode Either 'SPLIT' or 'JOIN'.
     * @private
     * @this Blockly.Block
     */
    updateType_: function(newMode) {
      if (newMode == 'SPLIT') {
        this.outputConnection.setCheck('Array');
        this.getInput('INPUT').setCheck('String');
      } else {
        this.outputConnection.setCheck('String');
        this.getInput('INPUT').setCheck('Array');
      }
    },
    /**
     * Create XML to represent the input and output types.
     * @return {!Element} XML storage element.
     * @this Blockly.Block
     */
    mutationToDom: function() {
      var container = document.createElement('mutation');
      container.setAttribute('mode', this.getFieldValue('MODE'));
      return container;
    },
    /**
     * Parse XML to restore the input and output types.
     * @param {!Element} xmlElement XML storage element.
     * @this Blockly.Block
     */
    domToMutation: function(xmlElement) {
      this.updateType_(xmlElement.getAttribute('mode'));
    }
  };
  