mirror of
https://github.com/scratchfoundation/scratch-blocks.git
synced 2025-06-03 16:34:59 -04:00
855ec2665a
starting with commit 6218750 (December 19, 2017) through commit 80b397f (January 10, 2018).
329 lines
19 KiB
JavaScript
329 lines
19 KiB
JavaScript
/**
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* @license
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* Visual Blocks Language
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*
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* Copyright 2012 Google Inc.
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* https://developers.google.com/blockly/
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @fileoverview Helper functions for generating JavaScript for blocks.
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* @author fraser@google.com (Neil Fraser)
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*/
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'use strict';
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goog.provide('Blockly.JavaScript');
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goog.require('Blockly.Generator');
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/**
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* JavaScript code generator.
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* @type {!Blockly.Generator}
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*/
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Blockly.JavaScript = new Blockly.Generator('JavaScript');
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/**
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* List of illegal variable names.
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* This is not intended to be a security feature. Blockly is 100% client-side,
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* so bypassing this list is trivial. This is intended to prevent users from
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* accidentally clobbering a built-in object or function.
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* @private
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*/
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Blockly.JavaScript.addReservedWords(
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'Blockly,' + // In case JS is evaled in the current window.
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// https://developer.mozilla.org/en/JavaScript/Reference/Reserved_Words
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'break,case,catch,continue,debugger,default,delete,do,else,finally,for,function,if,in,instanceof,new,return,switch,this,throw,try,typeof,var,void,while,with,' +
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'class,enum,export,extends,import,super,implements,interface,let,package,private,protected,public,static,yield,' +
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'const,null,true,false,' +
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// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects
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'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,' +
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// https://developer.mozilla.org/en/DOM/window
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'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,' +
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'addEventListener,alert,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,' +
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'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,' +
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'Image,Option,Worker,' +
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// https://developer.mozilla.org/en/Gecko_DOM_Reference
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'Event,Range,File,FileReader,Blob,BlobBuilder,' +
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'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,' +
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'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,' +
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'HTMLCanvasElement,CanvasRenderingContext2D,CanvasGradient,CanvasPattern,TextMetrics,ImageData,CanvasPixelArray,HTMLAudioElement,HTMLVideoElement,NotifyAudioAvailableEvent,HTMLCollection,HTMLAllCollection,HTMLFormControlsCollection,HTMLOptionsCollection,HTMLPropertiesCollection,DOMTokenList,DOMSettableTokenList,DOMStringMap,RadioNodeList,' +
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'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,' +
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'SVGAngle,SVGColor,SVGICCColor,SVGElementInstance,SVGElementInstanceList,SVGLength,SVGLengthList,SVGMatrix,SVGNumber,SVGNumberList,SVGPaint,SVGPoint,SVGPointList,SVGPreserveAspectRatio,SVGRect,SVGStringList,SVGTransform,SVGTransformList,' +
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'SVGAnimatedAngle,SVGAnimatedBoolean,SVGAnimatedEnumeration,SVGAnimatedInteger,SVGAnimatedLength,SVGAnimatedLengthList,SVGAnimatedNumber,SVGAnimatedNumberList,SVGAnimatedPreserveAspectRatio,SVGAnimatedRect,SVGAnimatedString,SVGAnimatedTransformList,' +
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'SVGPathSegList,SVGPathSeg,SVGPathSegArcAbs,SVGPathSegArcRel,SVGPathSegClosePath,SVGPathSegCurvetoCubicAbs,SVGPathSegCurvetoCubicRel,SVGPathSegCurvetoCubicSmoothAbs,SVGPathSegCurvetoCubicSmoothRel,SVGPathSegCurvetoQuadraticAbs,SVGPathSegCurvetoQuadraticRel,SVGPathSegCurvetoQuadraticSmoothAbs,SVGPathSegCurvetoQuadraticSmoothRel,SVGPathSegLinetoAbs,SVGPathSegLinetoHorizontalAbs,SVGPathSegLinetoHorizontalRel,SVGPathSegLinetoRel,SVGPathSegLinetoVerticalAbs,SVGPathSegLinetoVerticalRel,SVGPathSegMovetoAbs,SVGPathSegMovetoRel,ElementTimeControl,TimeEvent,SVGAnimatedPathData,' +
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'SVGAnimatedPoints,SVGColorProfileRule,SVGCSSRule,SVGExternalResourcesRequired,SVGFitToViewBox,SVGLangSpace,SVGLocatable,SVGRenderingIntent,SVGStylable,SVGTests,SVGTextContentElement,SVGTextPositioningElement,SVGTransformable,SVGUnitTypes,SVGURIReference,SVGViewSpec,SVGZoomAndPan');
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/**
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* Order of operation ENUMs.
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* https://developer.mozilla.org/en/JavaScript/Reference/Operators/Operator_Precedence
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*/
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Blockly.JavaScript.ORDER_ATOMIC = 0; // 0 "" ...
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Blockly.JavaScript.ORDER_NEW = 1.1; // new
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Blockly.JavaScript.ORDER_MEMBER = 1.2; // . []
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Blockly.JavaScript.ORDER_FUNCTION_CALL = 2; // ()
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Blockly.JavaScript.ORDER_INCREMENT = 3; // ++
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Blockly.JavaScript.ORDER_DECREMENT = 3; // --
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Blockly.JavaScript.ORDER_BITWISE_NOT = 4.1; // ~
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Blockly.JavaScript.ORDER_UNARY_PLUS = 4.2; // +
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Blockly.JavaScript.ORDER_UNARY_NEGATION = 4.3; // -
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Blockly.JavaScript.ORDER_LOGICAL_NOT = 4.4; // !
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Blockly.JavaScript.ORDER_TYPEOF = 4.5; // typeof
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Blockly.JavaScript.ORDER_VOID = 4.6; // void
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Blockly.JavaScript.ORDER_DELETE = 4.7; // delete
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Blockly.JavaScript.ORDER_DIVISION = 5.1; // /
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Blockly.JavaScript.ORDER_MULTIPLICATION = 5.2; // *
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Blockly.JavaScript.ORDER_MODULUS = 5.3; // %
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Blockly.JavaScript.ORDER_SUBTRACTION = 6.1; // -
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Blockly.JavaScript.ORDER_ADDITION = 6.2; // +
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Blockly.JavaScript.ORDER_BITWISE_SHIFT = 7; // << >> >>>
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Blockly.JavaScript.ORDER_RELATIONAL = 8; // < <= > >=
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Blockly.JavaScript.ORDER_IN = 8; // in
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Blockly.JavaScript.ORDER_INSTANCEOF = 8; // instanceof
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Blockly.JavaScript.ORDER_EQUALITY = 9; // == != === !==
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Blockly.JavaScript.ORDER_BITWISE_AND = 10; // &
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Blockly.JavaScript.ORDER_BITWISE_XOR = 11; // ^
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Blockly.JavaScript.ORDER_BITWISE_OR = 12; // |
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Blockly.JavaScript.ORDER_LOGICAL_AND = 13; // &&
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Blockly.JavaScript.ORDER_LOGICAL_OR = 14; // ||
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Blockly.JavaScript.ORDER_CONDITIONAL = 15; // ?:
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Blockly.JavaScript.ORDER_ASSIGNMENT = 16; // = += -= *= /= %= <<= >>= ...
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Blockly.JavaScript.ORDER_COMMA = 17; // ,
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Blockly.JavaScript.ORDER_NONE = 99; // (...)
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/**
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* List of outer-inner pairings that do NOT require parentheses.
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* @type {!Array.<!Array.<number>>}
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*/
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Blockly.JavaScript.ORDER_OVERRIDES = [
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// (foo()).bar -> foo().bar
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// (foo())[0] -> foo()[0]
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[Blockly.JavaScript.ORDER_FUNCTION_CALL, Blockly.JavaScript.ORDER_MEMBER],
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// (foo())() -> foo()()
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[Blockly.JavaScript.ORDER_FUNCTION_CALL, Blockly.JavaScript.ORDER_FUNCTION_CALL],
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// (foo.bar).baz -> foo.bar.baz
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// (foo.bar)[0] -> foo.bar[0]
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// (foo[0]).bar -> foo[0].bar
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// (foo[0])[1] -> foo[0][1]
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[Blockly.JavaScript.ORDER_MEMBER, Blockly.JavaScript.ORDER_MEMBER],
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// (foo.bar)() -> foo.bar()
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// (foo[0])() -> foo[0]()
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[Blockly.JavaScript.ORDER_MEMBER, Blockly.JavaScript.ORDER_FUNCTION_CALL],
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// !(!foo) -> !!foo
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[Blockly.JavaScript.ORDER_LOGICAL_NOT, Blockly.JavaScript.ORDER_LOGICAL_NOT],
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// a * (b * c) -> a * b * c
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[Blockly.JavaScript.ORDER_MULTIPLICATION, Blockly.JavaScript.ORDER_MULTIPLICATION],
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// a + (b + c) -> a + b + c
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[Blockly.JavaScript.ORDER_ADDITION, Blockly.JavaScript.ORDER_ADDITION],
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// a && (b && c) -> a && b && c
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[Blockly.JavaScript.ORDER_LOGICAL_AND, Blockly.JavaScript.ORDER_LOGICAL_AND],
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// a || (b || c) -> a || b || c
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[Blockly.JavaScript.ORDER_LOGICAL_OR, Blockly.JavaScript.ORDER_LOGICAL_OR]
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];
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/**
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* Initialise the database of variable names.
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* @param {!Blockly.Workspace} workspace Workspace to generate code from.
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*/
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Blockly.JavaScript.init = function(workspace) {
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// Create a dictionary of definitions to be printed before the code.
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Blockly.JavaScript.definitions_ = Object.create(null);
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// Create a dictionary mapping desired function names in definitions_
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// to actual function names (to avoid collisions with user functions).
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Blockly.JavaScript.functionNames_ = Object.create(null);
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if (!Blockly.JavaScript.variableDB_) {
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Blockly.JavaScript.variableDB_ =
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new Blockly.Names(Blockly.JavaScript.RESERVED_WORDS_);
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} else {
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Blockly.JavaScript.variableDB_.reset();
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}
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Blockly.JavaScript.variableDB_.setVariableMap(workspace.getVariableMap());
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var defvars = [];
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// Add user variables.
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var variables = workspace.getAllVariables();
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for (var i = 0; i < variables.length; i++) {
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defvars[i] = Blockly.JavaScript.variableDB_.getName(variables[i].getId(),
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Blockly.Variables.NAME_TYPE);
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}
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// Add developer variables (not created or named by the user).
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var devVarList = Blockly.Variables.allDeveloperVariables(workspace);
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for (var i = 0; i < devVarList.length; i++) {
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defvars.push(Blockly.JavaScript.variableDB_.getName(devVarList[i],
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Blockly.Names.DEVELOPER_VARIABLE_TYPE));
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}
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// Declare all of the variables.
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if (defvars.length) {
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Blockly.JavaScript.definitions_['variables'] =
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'var ' + defvars.join(', ') + ';';
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}
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};
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/**
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* Prepend the generated code with the variable definitions.
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* @param {string} code Generated code.
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* @return {string} Completed code.
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*/
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Blockly.JavaScript.finish = function(code) {
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// Convert the definitions dictionary into a list.
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var definitions = [];
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for (var name in Blockly.JavaScript.definitions_) {
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definitions.push(Blockly.JavaScript.definitions_[name]);
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}
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// Clean up temporary data.
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delete Blockly.JavaScript.definitions_;
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delete Blockly.JavaScript.functionNames_;
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Blockly.JavaScript.variableDB_.reset();
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return definitions.join('\n\n') + '\n\n\n' + code;
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};
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/**
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* Naked values are top-level blocks with outputs that aren't plugged into
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* anything. A trailing semicolon is needed to make this legal.
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* @param {string} line Line of generated code.
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* @return {string} Legal line of code.
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*/
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Blockly.JavaScript.scrubNakedValue = function(line) {
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return line + ';\n';
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};
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/**
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* Encode a string as a properly escaped JavaScript string, complete with
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* quotes.
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* @param {string} string Text to encode.
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* @return {string} JavaScript string.
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* @private
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*/
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Blockly.JavaScript.quote_ = function(string) {
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// Can't use goog.string.quote since Google's style guide recommends
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// JS string literals use single quotes.
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string = string.replace(/\\/g, '\\\\')
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.replace(/\n/g, '\\\n')
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.replace(/'/g, '\\\'');
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return '\'' + string + '\'';
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};
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/**
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* Common tasks for generating JavaScript from blocks.
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* Handles comments for the specified block and any connected value blocks.
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* Calls any statements following this block.
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* @param {!Blockly.Block} block The current block.
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* @param {string} code The JavaScript code created for this block.
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* @return {string} JavaScript code with comments and subsequent blocks added.
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* @private
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*/
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Blockly.JavaScript.scrub_ = function(block, code) {
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var commentCode = '';
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// Only collect comments for blocks that aren't inline.
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if (!block.outputConnection || !block.outputConnection.targetConnection) {
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// Collect comment for this block.
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var comment = block.getCommentText();
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comment = Blockly.utils.wrap(comment, Blockly.JavaScript.COMMENT_WRAP - 3);
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if (comment) {
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if (block.getProcedureDef) {
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// Use a comment block for function comments.
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commentCode += '/**\n' +
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Blockly.JavaScript.prefixLines(comment + '\n', ' * ') +
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' */\n';
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} else {
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commentCode += Blockly.JavaScript.prefixLines(comment + '\n', '// ');
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}
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}
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// Collect comments for all value arguments.
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// Don't collect comments for nested statements.
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for (var i = 0; i < block.inputList.length; i++) {
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if (block.inputList[i].type == Blockly.INPUT_VALUE) {
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var childBlock = block.inputList[i].connection.targetBlock();
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if (childBlock) {
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var comment = Blockly.JavaScript.allNestedComments(childBlock);
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if (comment) {
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commentCode += Blockly.JavaScript.prefixLines(comment, '// ');
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}
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}
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}
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}
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}
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var nextBlock = block.nextConnection && block.nextConnection.targetBlock();
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var nextCode = Blockly.JavaScript.blockToCode(nextBlock);
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return commentCode + code + nextCode;
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};
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/**
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* Gets a property and adjusts the value while taking into account indexing.
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* @param {!Blockly.Block} block The block.
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* @param {string} atId The property ID of the element to get.
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* @param {number=} opt_delta Value to add.
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* @param {boolean=} opt_negate Whether to negate the value.
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* @param {number=} opt_order The highest order acting on this value.
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* @return {string|number}
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*/
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Blockly.JavaScript.getAdjusted = function(block, atId, opt_delta, opt_negate,
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opt_order) {
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var delta = opt_delta || 0;
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var order = opt_order || Blockly.JavaScript.ORDER_NONE;
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if (block.workspace.options.oneBasedIndex) {
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delta--;
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}
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var defaultAtIndex = block.workspace.options.oneBasedIndex ? '1' : '0';
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if (delta > 0) {
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var at = Blockly.JavaScript.valueToCode(block, atId,
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Blockly.JavaScript.ORDER_ADDITION) || defaultAtIndex;
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} else if (delta < 0) {
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var at = Blockly.JavaScript.valueToCode(block, atId,
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Blockly.JavaScript.ORDER_SUBTRACTION) || defaultAtIndex;
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} else if (opt_negate) {
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var at = Blockly.JavaScript.valueToCode(block, atId,
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Blockly.JavaScript.ORDER_UNARY_NEGATION) || defaultAtIndex;
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} else {
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var at = Blockly.JavaScript.valueToCode(block, atId, order) ||
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defaultAtIndex;
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}
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if (Blockly.isNumber(at)) {
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// If the index is a naked number, adjust it right now.
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at = parseFloat(at) + delta;
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if (opt_negate) {
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at = -at;
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}
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} else {
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// If the index is dynamic, adjust it in code.
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if (delta > 0) {
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at = at + ' + ' + delta;
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var innerOrder = Blockly.JavaScript.ORDER_ADDITION;
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} else if (delta < 0) {
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at = at + ' - ' + -delta;
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var innerOrder = Blockly.JavaScript.ORDER_SUBTRACTION;
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}
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if (opt_negate) {
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if (delta) {
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at = '-(' + at + ')';
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} else {
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at = '-' + at;
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}
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var innerOrder = Blockly.JavaScript.ORDER_UNARY_NEGATION;
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}
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innerOrder = Math.floor(innerOrder);
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order = Math.floor(order);
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if (innerOrder && order >= innerOrder) {
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at = '(' + at + ')';
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}
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}
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return at;
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};
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