text: /**
   * @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 Helper functions for generating JavaScript for blocks.
   * @author fraser@google.com (Neil Fraser)
   */
  'use strict';
  
  goog.provide('Blockly.JavaScript');
  
  goog.require('Blockly.Generator');
  
  
  /**
   * JavaScript code generator.
   * @type {!Blockly.Generator}
   */
  Blockly.JavaScript = new Blockly.Generator('JavaScript');
  
  /**
   * List of illegal variable names.
   * This is not intended to be a security feature.  Blockly is 100% client-side,
   * so bypassing this list is trivial.  This is intended to prevent users from
   * accidentally clobbering a built-in object or function.
   * @private
   */
  Blockly.JavaScript.addReservedWords(
      'Blockly,' +  // In case JS is evaled in the current window.
      // https://developer.mozilla.org/en/JavaScript/Reference/Reserved_Words
      'break,case,rex,catch,continue,debugger,default,delete,do,else,finally,for,function,if,in,instanceof,new,return,switch,this,throw,try,typeof,var,void,while,with,' +
      'class,enum,export,extends,import,super,implements,interface,let,package,private,protected,public,static,yield,' +
      'const,null,true,false,' +
      // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects
      'Array,ArrayBuffer,Boolean,Date,decodeURI,decodeURIComponent,encodeURI,encodeURIComponent,Error,eval,EvalError,Float32Array,Float64Array,Function,Infinity,Int16Array,Int32Array,Int8Array,isFinite,isNaN,Iterator,JSON,Math,NaN,Number,Object,parseFloat,parseInt,RangeError,ReferenceError,RegExp,StopIteration,String,SyntaxError,TypeError,Uint16Array,Uint32Array,Uint8Array,Uint8ClampedArray,undefined,uneval,URIError,' +
      // https://developer.mozilla.org/en/DOM/window
      'applicationCache, closed,Components,content,_content,controllers,crypto,defaultStatus,dialogArguments,directories,document,frameElement,frames,fullScreen,globalStorage,history,innerHeight,innerWidth,length,location,locationbar,localStorage,menubar,messageManager,mozAnimationStartTime,mozInnerScreenX,mozInnerScreenY,mozPaintCount,name,navigator,opener,outerHeight,outerWidth,pageXOffset,pageYOffset,parent,performance,personalbar,pkcs11,returnValue,screen,screenX,screenY,scrollbars,scrollMaxX,scrollMaxY,scrollX,scrollY,self,sessionStorage,sidebar,status,statusbar,toolbar,top,URL,window,' +
      'addEventListener,alert,rex,console,atob,back,blur,btoa,captureEvents,clearImmediate,clearInterval,clearTimeout,close,confirm,disableExternalCapture,dispatchEvent,dump,enableExternalCapture,escape,find,focus,forward,GeckoActiveXObject,getAttention,getAttentionWithCycleCount,getComputedStyle,getSelection,home,matchMedia,maximize,minimize,moveBy,moveTo,mozRequestAnimationFrame,open,openDialog,postMessage,print,prompt,QueryInterface,releaseEvents,removeEventListener,resizeBy,resizeTo,restore,routeEvent,scroll,scrollBy,scrollByLines,scrollByPages,scrollTo,setCursor,setImmediate,setInterval,setResizable,setTimeout,showModalDialog,sizeToContent,stop,unescape,updateCommands,XPCNativeWrapper,XPCSafeJSObjectWrapper,' +
      'onabort,onbeforeunload,onblur,onchange,onclick,onclose,oncontextmenu,ondevicemotion,ondeviceorientation,ondragdrop,onerror,onfocus,onhashchange,onkeydown,onkeypress,onkeyup,onload,onmousedown,onmousemove,onmouseout,onmouseover,onmouseup,onmozbeforepaint,onpaint,onpopstate,onreset,onresize,onscroll,onselect,onsubmit,onunload,onpageshow,onpagehide,' +
      'Image,Option,Worker,' +
      // https://developer.mozilla.org/en/Gecko_DOM_Reference
      'Event,Range,File,FileReader,Blob,BlobBuilder,' +
      'Attr,CDATASection,CharacterData,Comment,console,DocumentFragment,DocumentType,DomConfiguration,DOMError,DOMErrorHandler,DOMException,DOMImplementation,DOMImplementationList,DOMImplementationRegistry,DOMImplementationSource,DOMLocator,DOMObject,DOMString,DOMStringList,DOMTimeStamp,DOMUserData,Entity,EntityReference,MediaQueryList,MediaQueryListListener,NameList,NamedNodeMap,Node,NodeFilter,NodeIterator,NodeList,Notation,Plugin,PluginArray,ProcessingInstruction,SharedWorker,Text,TimeRanges,Treewalker,TypeInfo,UserDataHandler,Worker,WorkerGlobalScope,' +
      'HTMLDocument,HTMLElement,HTMLAnchorElement,HTMLAppletElement,HTMLAudioElement,HTMLAreaElement,HTMLBaseElement,HTMLBaseFontElement,HTMLBodyElement,HTMLBRElement,HTMLButtonElement,HTMLCanvasElement,HTMLDirectoryElement,HTMLDivElement,HTMLDListElement,HTMLEmbedElement,HTMLFieldSetElement,HTMLFontElement,HTMLFormElement,HTMLFrameElement,HTMLFrameSetElement,HTMLHeadElement,HTMLHeadingElement,HTMLHtmlElement,HTMLHRElement,HTMLIFrameElement,HTMLImageElement,HTMLInputElement,HTMLKeygenElement,HTMLLabelElement,HTMLLIElement,HTMLLinkElement,HTMLMapElement,HTMLMenuElement,HTMLMetaElement,HTMLModElement,HTMLObjectElement,HTMLOListElement,HTMLOptGroupElement,HTMLOptionElement,HTMLOutputElement,HTMLParagraphElement,HTMLParamElement,HTMLPreElement,HTMLQuoteElement,HTMLScriptElement,HTMLSelectElement,HTMLSourceElement,HTMLSpanElement,HTMLStyleElement,HTMLTableElement,HTMLTableCaptionElement,HTMLTableCellElement,HTMLTableDataCellElement,HTMLTableHeaderCellElement,HTMLTableColElement,HTMLTableRowElement,HTMLTableSectionElement,HTMLTextAreaElement,HTMLTimeElement,HTMLTitleElement,HTMLTrackElement,HTMLUListElement,HTMLUnknownElement,HTMLVideoElement,' +
      'HTMLCanvasElement,CanvasRenderingContext2D,CanvasGradient,CanvasPattern,TextMetrics,ImageData,CanvasPixelArray,HTMLAudioElement,HTMLVideoElement,NotifyAudioAvailableEvent,HTMLCollection,HTMLAllCollection,HTMLFormControlsCollection,HTMLOptionsCollection,HTMLPropertiesCollection,DOMTokenList,DOMSettableTokenList,DOMStringMap,RadioNodeList,' +
      'SVGDocument,SVGElement,SVGAElement,SVGAltGlyphElement,SVGAltGlyphDefElement,SVGAltGlyphItemElement,SVGAnimationElement,SVGAnimateElement,SVGAnimateColorElement,SVGAnimateMotionElement,SVGAnimateTransformElement,SVGSetElement,SVGCircleElement,SVGClipPathElement,SVGColorProfileElement,SVGCursorElement,SVGDefsElement,SVGDescElement,SVGEllipseElement,SVGFilterElement,SVGFilterPrimitiveStandardAttributes,SVGFEBlendElement,SVGFEColorMatrixElement,SVGFEComponentTransferElement,SVGFECompositeElement,SVGFEConvolveMatrixElement,SVGFEDiffuseLightingElement,SVGFEDisplacementMapElement,SVGFEDistantLightElement,SVGFEFloodElement,SVGFEGaussianBlurElement,SVGFEImageElement,SVGFEMergeElement,SVGFEMergeNodeElement,SVGFEMorphologyElement,SVGFEOffsetElement,SVGFEPointLightElement,SVGFESpecularLightingElement,SVGFESpotLightElement,SVGFETileElement,SVGFETurbulenceElement,SVGComponentTransferFunctionElement,SVGFEFuncRElement,SVGFEFuncGElement,SVGFEFuncBElement,SVGFEFuncAElement,SVGFontElement,SVGFontFaceElement,SVGFontFaceFormatElement,SVGFontFaceNameElement,SVGFontFaceSrcElement,SVGFontFaceUriElement,SVGForeignObjectElement,SVGGElement,SVGGlyphElement,SVGGlyphRefElement,SVGGradientElement,SVGLinearGradientElement,SVGRadialGradientElement,SVGHKernElement,SVGImageElement,SVGLineElement,SVGMarkerElement,SVGMaskElement,SVGMetadataElement,SVGMissingGlyphElement,SVGMPathElement,SVGPathElement,SVGPatternElement,SVGPolylineElement,SVGPolygonElement,SVGRectElement,SVGScriptElement,SVGStopElement,SVGStyleElement,SVGSVGElement,SVGSwitchElement,SVGSymbolElement,SVGTextElement,SVGTextPathElement,SVGTitleElement,SVGTRefElement,SVGTSpanElement,SVGUseElement,SVGViewElement,SVGVKernElement,' +
      'SVGAngle,SVGColor,SVGICCColor,SVGElementInstance,SVGElementInstanceList,SVGLength,SVGLengthList,SVGMatrix,SVGNumber,SVGNumberList,SVGPaint,SVGPoint,SVGPointList,SVGPreserveAspectRatio,SVGRect,SVGStringList,SVGTransform,SVGTransformList,' +
      'SVGAnimatedAngle,SVGAnimatedBoolean,SVGAnimatedEnumeration,SVGAnimatedInteger,SVGAnimatedLength,SVGAnimatedLengthList,SVGAnimatedNumber,SVGAnimatedNumberList,SVGAnimatedPreserveAspectRatio,SVGAnimatedRect,SVGAnimatedString,SVGAnimatedTransformList,' +
      'SVGPathSegList,SVGPathSeg,SVGPathSegArcAbs,SVGPathSegArcRel,SVGPathSegClosePath,SVGPathSegCurvetoCubicAbs,SVGPathSegCurvetoCubicRel,SVGPathSegCurvetoCubicSmoothAbs,SVGPathSegCurvetoCubicSmoothRel,SVGPathSegCurvetoQuadraticAbs,SVGPathSegCurvetoQuadraticRel,SVGPathSegCurvetoQuadraticSmoothAbs,SVGPathSegCurvetoQuadraticSmoothRel,SVGPathSegLinetoAbs,SVGPathSegLinetoHorizontalAbs,SVGPathSegLinetoHorizontalRel,SVGPathSegLinetoRel,SVGPathSegLinetoVerticalAbs,SVGPathSegLinetoVerticalRel,SVGPathSegMovetoAbs,SVGPathSegMovetoRel,ElementTimeControl,TimeEvent,SVGAnimatedPathData,' +
      'SVGAnimatedPoints,SVGColorProfileRule,SVGCSSRule,SVGExternalResourcesRequired,SVGFitToViewBox,SVGLangSpace,SVGLocatable,SVGRenderingIntent,SVGStylable,SVGTests,SVGTextContentElement,SVGTextPositioningElement,SVGTransformable,SVGUnitTypes,SVGURIReference,SVGViewSpec,SVGZoomAndPan');
  
  /**
   * Order of operation ENUMs.
   * https://developer.mozilla.org/en/JavaScript/Reference/Operators/Operator_Precedence
   */
  Blockly.JavaScript.ORDER_ATOMIC = 0;         // 0 "" ...
  Blockly.JavaScript.ORDER_MEMBER = 1;         // . []
  Blockly.JavaScript.ORDER_NEW = 1;            // new
  Blockly.JavaScript.ORDER_FUNCTION_CALL = 2;  // ()
  Blockly.JavaScript.ORDER_INCREMENT = 3;      // ++
  Blockly.JavaScript.ORDER_DECREMENT = 3;      // --
  Blockly.JavaScript.ORDER_LOGICAL_NOT = 4;    // !
  Blockly.JavaScript.ORDER_BITWISE_NOT = 4;    // ~
  Blockly.JavaScript.ORDER_UNARY_PLUS = 4;     // +
  Blockly.JavaScript.ORDER_UNARY_NEGATION = 4; // -
  Blockly.JavaScript.ORDER_TYPEOF = 4;         // typeof
  Blockly.JavaScript.ORDER_VOID = 4;           // void
  Blockly.JavaScript.ORDER_DELETE = 4;         // delete
  Blockly.JavaScript.ORDER_MULTIPLICATION = 5; // *
  Blockly.JavaScript.ORDER_DIVISION = 5;       // /
  Blockly.JavaScript.ORDER_MODULUS = 5;        // %
  Blockly.JavaScript.ORDER_ADDITION = 6;       // +
  Blockly.JavaScript.ORDER_SUBTRACTION = 6;    // -
  Blockly.JavaScript.ORDER_BITWISE_SHIFT = 7;  // << >> >>>
  Blockly.JavaScript.ORDER_RELATIONAL = 8;     // < <= > >=
  Blockly.JavaScript.ORDER_IN = 8;             // in
  Blockly.JavaScript.ORDER_INSTANCEOF = 8;     // instanceof
  Blockly.JavaScript.ORDER_EQUALITY = 9;       // == != === !==
  Blockly.JavaScript.ORDER_BITWISE_AND = 10;   // &
  Blockly.JavaScript.ORDER_BITWISE_XOR = 11;   // ^
  Blockly.JavaScript.ORDER_BITWISE_OR = 12;    // |
  Blockly.JavaScript.ORDER_LOGICAL_AND = 13;   // &&
  Blockly.JavaScript.ORDER_LOGICAL_OR = 14;    // ||
  Blockly.JavaScript.ORDER_CONDITIONAL = 15;   // ?:
  Blockly.JavaScript.ORDER_ASSIGNMENT = 16;    // = += -= *= /= %= <<= >>= ...
  Blockly.JavaScript.ORDER_COMMA = 17;         // ,
  Blockly.JavaScript.ORDER_NONE = 99;          // (...)
  
  /**
   * Initialise the database of variable names.
   * @param {!Blockly.Workspace} workspace Workspace to generate code from.
   */
  Blockly.JavaScript.init = function(workspace) {
    // Create a dictionary of definitions to be printed before the code.
    Blockly.JavaScript.definitions_ = Object.create(null);
    // Create a dictionary mapping desired function names in definitions_
    // to actual function names (to avoid collisions with user functions).
    Blockly.JavaScript.functionNames_ = Object.create(null);
  
    if (!Blockly.JavaScript.variableDB_) {
      Blockly.JavaScript.variableDB_ =
          new Blockly.Names(Blockly.JavaScript.RESERVED_WORDS_);
    } else {
      Blockly.JavaScript.variableDB_.reset();
    }
  
    var defvars = [];
    var variables = Blockly.Variables.allVariables(workspace);
    for (var i = 0; i < variables.length; i++) {
      defvars[i] = 'var ' +
          Blockly.JavaScript.variableDB_.getName(variables[i],
          Blockly.Variables.NAME_TYPE) + ';';
    }
    Blockly.JavaScript.definitions_['variables'] = defvars.join('\n');
  };
  
  /**
   * Prepend the generated code with the variable definitions.
   * @param {string} code Generated code.
   * @return {string} Completed code.
   */
  Blockly.JavaScript.finish = function(code) {
    // Convert the definitions dictionary into a list.
    var definitions = [];
    for (var name in Blockly.JavaScript.definitions_) {
      definitions.push(Blockly.JavaScript.definitions_[name]);
    }
    // Clean up temporary data.
    delete Blockly.JavaScript.definitions_;
    delete Blockly.JavaScript.functionNames_;
    Blockly.JavaScript.variableDB_.reset();
    return definitions.join('\n\n') + '\n\n\n' + code;
  };
  
  /**
   * Naked values are top-level blocks with outputs that aren't plugged into
   * anything.  A trailing semicolon is needed to make this legal.
   * @param {string} line Line of generated code.
   * @return {string} Legal line of code.
   */
  Blockly.JavaScript.scrubNakedValue = function(line) {
    return line + ';\n';
  };
  
  /**
   * Encode a string as a properly escaped JavaScript string, complete with
   * quotes.
   * @param {string} string Text to encode.
   * @return {string} JavaScript string.
   * @private
   */
  Blockly.JavaScript.quote_ = function(string) {
    // TODO: This is a quick hack.  Replace with goog.string.quote
    string = string.replace(/\\/g, '\\\\')
                   .replace(/\n/g, '\\\n')
                   .replace(/'/g, '\\\'');
    return '\'' + string + '\'';
  };
  
  /**
   * Common tasks for generating JavaScript from blocks.
   * Handles comments for the specified block and any connected value blocks.
   * Calls any statements following this block.
   * @param {!Blockly.Block} block The current block.
   * @param {string} code The JavaScript code created for this block.
   * @return {string} JavaScript code with comments and subsequent blocks added.
   * @private
   */
  Blockly.JavaScript.scrub_ = function(block, code) {
    var commentCode = '';
    // Only collect comments for blocks that aren't inline.
    if (!block.outputConnection || !block.outputConnection.targetConnection) {
      // Collect comment for this block.
      var comment = block.getCommentText();
      if (comment) {
        commentCode += Blockly.JavaScript.prefixLines(comment, '// ') + '\n';
      }
      // Collect comments for all value arguments.
      // Don't collect comments for nested statements.
      for (var x = 0; x < block.inputList.length; x++) {
        if (block.inputList[x].type == Blockly.INPUT_VALUE) {
          var childBlock = block.inputList[x].connection.targetBlock();
          if (childBlock) {
            var comment = Blockly.JavaScript.allNestedComments(childBlock);
            if (comment) {
              commentCode += Blockly.JavaScript.prefixLines(comment, '// ');
            }
          }
        }
      }
    }
    var nextBlock = block.nextConnection && block.nextConnection.targetBlock();
    var nextCode = Blockly.JavaScript.blockToCode(nextBlock);
    return commentCode + code + nextCode;
  };
  