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VisualLISA

VisualLISA. Attribute Grammars made easy. Author. Context. Institution. Presentation. University of Minho. UCE-15, Master in Informatics. Nuno Oliveira, nuno43549@gmail.com. The Problem. Conception of a Visual Language ; Development of a Processor for the Language ;

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VisualLISA

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  1. VisualLISA AttributeGrammarsmadeeasy... Author Context Institution Presentation Universityof Minho UCE-15, MasterinInformatics Nuno Oliveira, nuno43549@gmail.com

  2. TheProblem • Conceptionof a Visual Language; • Developmentof a Processor for theLanguage; • Idealizationofthe Visual Language; • Formalizationofthelanguage; • Concretizationoftheinitialidea;

  3. AfterFunnyTimes...

  4. Let’sget to Business! • VisualLISA Analysis • DomainAnalysis • VL Formal Notations • VPE generators • Implementation

  5. VisualLISA Analysis • VisualLISA – a graphicalfront-end for LISA (anAG-basedcompilergenerator); • Visual EditionofAttributeGrammars (production-oriented); • Aimsatreducing mental effortwhenspecifyingAGs; • Performssyntaxandsemanticcheckofthe AG modeldrawn; • Generates code (LISA, XML, BNF) fromthedrawings; • The environment shouldbeautomaticandsystematicallygeneratedresorting to a VPE generator

  6. DomainSpecificProblem • Theknowladgeabout AG wasnotenough; • Decicion: Search for AG domainknowledgeuntiltheendoftheworld; • When I getback: Deepundertstandingabout AG;

  7. VL Formal Notations • Twowerefound: MASOViLAand PLG; • PLG waschosen: • IssimplerthanMASOViLA; • Closer to BNF usual notation; TERMINAL → over ( rectangle, text) TREE_BRANCH → points_from ( points_to (line, ~TERMINAL) , ~LEFT_SYMBOL) | points_from ( points_to ( line, ˜NONTERMINAL) , ~LEFT SYMBOL)

  8. VPE Generators • Several VPE generatorshavebeenstudied: • DEViL • VLDesk • Tiger • ... • DEViL waschosen: • Basedon Modular SymbolOriented AG Specifications; • Generated environment is complete butextensible; • Stand-alone environment for themostimportantSOs; • ...

  9. Implementation • TheDevelopmentProcess • AbstractSyntaxDefinition; • InteractionandLayoutDefinition; • SemanticsVerificationImplementation; • CodeGeneration.

  10. SystematicDevelopment Systematization VisualLISA AbstractSyntax Definition Code Generation TG Semantics Implementation TG module Interaction&Layout Definition TW module TG TG module

  11. Scene 1 • TheDevelopmentProcess • AbstractSyntaxDefinition; • InteractionandLayoutDefinition; • SemanticsVerificationImplementation; • CodeGeneration.

  12. AbstractSyntaxDefinition AbstractSyntax Definition TreeGrammar (TG) Join&Transform PLG TERMINAL → over ( rectangle, text) (…) Structure Definition CLASS Root { name: VAL VLString; semprods: SUB Semprod*; definitions: SUB Definitions!; library: SUB Library?; } ...

  13. SystematicDevelopment (2) Systematization VisualLISA AbstractSyntax Definition Code Generation TG Semantics Implementation TG module Interaction&Layout Definition TW module TG TG module

  14. Scene 2 • TheDevelopmentProcess • AbstractSyntaxDefinition; • InteractionandLayoutDefinition; • SemanticsVerificationImplementation; • CodeGeneration.

  15. Interaction & LayoutDefinition Interaction&Layout Definition TG module Join&Transform Views Definition VIEW rootView ROOT Root { BUTTON IMAGE "img::btnSemprod” INSERTS Semprod INFO "Inserts a newProduction"; } Symbols Definition SYMBOL rootView_Root INHERITS VPRootElement, VPForm COMPUTE SYNT.drawing = ADDROF(rootViewDrawing); END; SYMBOL rootView_Root_semprods INHERITS VPFormElement, VPSimpleList COMPUTE SYNT.formElementName = "productions"; END;

  16. SystematicDevelopment (3) Systematization VisualLISA DEViL AbstractSyntax Definition Code Generation TG Semantics Implementation TG module Interaction&Layout Definition TW module TG TG module

  17. Scene 3 • TheDevelopmentProcess • AbstractSyntaxDefinition; • InteractionandLayoutDefinition; • SemanticsVerificationImplementation; • CodeGeneration.

  18. SemanticsImplementation Semantics Implementation TW TG module TCL_programming Formal Constraints checkutil::addCheckSemprod { setn [llength [c::getList {$obj.grammarElements.CHILDREN[LeftSymbol]}]] setsymbName [c::get {$obj.name.VALUE}] if { $n == 0 } { eturn "Production '$symbName' musthaveoneRootsymbol!” } elseif {$n > 1} { return "Production '$symbName' musthaveonlyoneRootsymbol!” } return ”” } • A productionmusthaveoneandonlyonerootsymbol; • (...) =>

  19. Scene 4 • TheDevelopmentProcess • AbstractSyntaxDefinition; • InteractionandLayoutDefinition; • SemanticsVerificationImplementation; • CodeGeneration.

  20. CodeGeneration CodeGeneration TG module Join&Transform Auxiliary Functions Translation Templates LISA, XAGra, BNF SYMBOL bnfgen_Semprod COMPUTE SYNT.bnfLHS = CONSTITUENTS bnfgen_LeftSymbol.pers_symbolName WITH(PTGNode, PTGNewLineSeq, PTGAsIs, PTGNull); SYNT.bnfRHS = PTGAsIs(VLString(SELECT(vlList( "printBNFOrderedRHSElements",THIS.objId),eval()))); SYNT.bnfCode = PTGbnfProd(THIS.bnfLHS, THIS.bnfRHS); END; bnfProd(lhs, rhs): [lhs] -> [rhs]

  21. SystematicDevelopment (4) Systematization VisualLISA DEViL AbstractSyntax Definition Code Generation TG Semantics Implementation TG module Interaction&Layout Definition TW module TG TG module

  22. Example LISA • GenerationofCodeFromthe AG Drawn • LISA • Generates XAGra XAGra

  23. OneStep More • RequirementsAnalysis • DomainAnalysis • VL Formal Notations • VPE generators • Implementation • Dissemination

  24. Dissemination • Website developed : www.di.uminho.pt/~gepl/VisualLISA • Complete TechnicalReportwritten • Paperssubmited to InternationalConferences • SeveralTalks weregiven.

  25. ConclusionandFutureWork • VisualLISA reallyworks! • The use ofan environment generatorallows a systematicdevelopment; • Maintainingandevolvingthe modules iseasy; • Itlacksanusabilitytest to confirmwhether VisualLISA easesornotthespecificationof AG;

  26. VisualLISA www.di.uminho.pt/~gepl/VisualLISA

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