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Constructs & Concepts

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Constructs & Concepts Constructs & Concepts Language Design for Flexibility and Reliability Anya Helene Bagge moduleCppSkinhiddenscontext-freestart-symbolsProgramimportsDeclarationsexportssortsTmplClauseClassClausecontext-freesyntaxTmplClauseDecl->Decl cons("TmplDecl") "template""<" TypeParam"," *">"RequiresClause*->TmplClause cons("Template") "requires"Identifier"<" ConceptArgument"," *">"->RequiresClause cons("Requires") "template""<" TypeParam"," *">""type"Identifier->TypeParam cons("TemplateType") ExprDeclarativeSubClause*" ""return"Expr";"" "->Decl cons("DefDecl") "typename"Type->TypePar am prefer,cons("TypeParam") "class"Type->TypeParam prefer,cons("TypeParam") "class"TypeNameTypeParamList?->ClassClause cons("ClassClause") ClassClause->DeclDeclarativemoduleDeclarationsimportsLiteralsConceptsStatementsDataRepresenta{ } { } { tionexp} ortssortsStatDeclarativeExprDeclarativeDec{ } lDeclarativeSubClausecon{ text-freesyntaxSta} tDeclarati{ veSubClau} se*BlockStat->Decl cons("DefDecl"{ ) ExprDeclarativeSubClaus} e*"="Expr";"->Decl cons("DefDecl"){ TypeDeclarativeSub} { Clause*"="}DataRep->Decl cons("DefDec l"){ DeclDeclarativeSubClause*"} "Decl*" "->Decl cons("DefDecl"){ StatDeclarativeSubClause*";"->Decl} cons("NoDefDecl") ExprDeclarativeSubClause*";"->Decl{ } cons("NoDefDecl") TypeDeclarativeSubClause*";"->Decl cons("NoDefDecl") DeclDeclarativeSubClause*";"->Decl cons("NoDefDecl") sortsProcClauseProcNamecontext-freesyntax"procedure"ProcNameProcedureParamList->ProcClause{ cons("ProcClaus} e") ProcClause->StatDeclarativeIdentifier->ProcName"{ = "->ProcName} cons("Assign") sortsFunClauseFunNameconte{ xt-freesyntax"function"TypeFunNameFunctionParamList->FunClause} { } { } cons("FunClause") "define"TypeFunNameF{ unctionParamList->FunClause} cons("FunClause") "define"TypeFunName->FunCl{ } ause cons("FunClause") FunClause->ExprDeclarativeIdentifier->{ } FunNamesortsPredClausePredNamecontext-freesyntax"p{ } redicate"PredNameFunctionParamList->PredClause cons("PredClause") PredClause->ExprD{ eclarativeIdent}ifier->PredNamesortsTypeParamListTypeParamFunctionParamListFunctionParamProcedureParamListProcedureParamPar{ } amModecontext-freesyntax"(" TypeParam"," *")"->TypeParamList cons("Dummy"){ "(" FunctionParam","} *")"->FunctionParamList cons("Dummy"){ "(" ProcedureParam","} *")"->ProcedureParamList{ cons("Dummy") Type->TypeParam} cons("TypeExprParam") TypeIdentifier->TypeParam cons("TypeExprParam") "type"->TypeParam cons("AnonTypeParam") "type"Identifi{er->TypeParam cons("} TypeParam") "type"TypeParamList->TypeParam cons("AnonTypePParam") "type"IdentifierTypeParamList->TypeParam cons("TypePParam") TypeIden tifier->FunctionParam cons("Param"){ Type->FunctionParam} cons("AnonParam"){ ParamModeTypeIdentifier->Proc} { } edureParam prefer,cons("Param"){ } TypeIdentifier->ProcedureParam{ } cons("ObsParam"){ ParamModeTyp} e->ProcedureParam{ prefer,cons("AnonPa} ram") "type"Type->ProcedureParam{ cons("TypeOpParam")} "type"Type->{FunctionParam cons("TypeOpParam")} "obs"->ParamMode{ cons("Obs") "upd"->Param} Mode cons("Upd") "out"->ParamMode{ cons("Out") "exp"->ParamMode} cons("Exp") "giv"->ParamMod{ e cons("Giv") "del"->ParamM} ode cons("Del") "nrm"->ParamMode{ cons("Nrm")} sortsAttrClauseAttributecontext-freesyntax"["{ } Attribute"," *"]"->AttrClause{ cons("Attrs") AttrClause->SubClauseIdentifier->Attrib} { ute cons("Attr")} Identifier"(" Expr"," *")"->Att{ ribute cons("Attr}") sortsAlertClauseAlertNamecontext-freesyntax"guard"Expr->{ } AlertClause cons("G{ uard") "guard""} by"Expr->AlertCl{ause prefer,cons("Gua} rd") "alert"{ AlertName"i} f"Expr->AlertClause{ cons("AlertIf")} "alert"AlertName"unless"Expr{ } ->AlertCl{ ause cons("AlertUnless")} "success""if"Expr->AlertClause{ } cons("SuccessIf"){ } "success""unless"Expr->AlertClause cons("SuccessUnless"){ } "fail""if"Expr->AlertClause{ } cons("FailIf") "fail""unless"Expr->AlertCla{ use cons("FailUnle} ss") Identifier->AlertName{ } AlertCla{ use->SubCl}ausesortsForAllClausecontext-freesyntax"forall" TypeParam"," +->ForA{llClause cons("} ForAll") ForAllClause->SubClausesortsVarCla{ useVarN} amecontext-freesyntax"var"TypeVarName->VarClause{ cons("VarClause")} VarClause->ExprDeclarativeIdentif{ ier->VarNamesort sTypeNameTypeClauseClassClausecontext-freesyntax"type"TypeNameTypeParamList?->TypeClause} { } { cons("TypeClause")} Identifier->TypeNameTypeClause->TypeDeclarative"opens""("{ } Identifier"," {*")"->SubClause cons} ("Opens") "default""(" Identifier"," *")"->SubClause cons("Default") moduledesugarimports{ Magnoliamagn} olia/commonsignatures{ ortsPosAnnotatio} nconstructorsarea:Int*Int*Int*Int*Int*Int->Annotationarea-in-file:String*Pos->AnnotationClass:Name*List(Type)->Sigstrate{ } giesdesugar=magnolia-io(filenam e-option,norm-tree;fix-imports;downup(try(norm0);repeat(preserve-annotation(norm1));try(preserve-annotation(n{ } orm2));strip-anno,try(preserve-annotation(norm-forall+norm-cxx))))ov{ er} ride-tree-handler(s|format)=sfilename-option{ } { =ArgOption(}"-f"+"--filename",where(<set-config>("-f",<id>)),!"-ff|--filenam{ } efSetsourcefilenametof")norm0:SName([n])->nnorm0:SName(n@[ , | ])->QName(n)norm0:RName(n)->QName(n)norm0:TypeTuple(ts)->Type(Tuple(),ts)norm0:PType(n,ps)->Type(n,ps’)where<map(try( MatchExpr( t)->MatchType(t) ))>ps=>ps’norm0:Type(n)->Type(n,[])norm0:TypeExpr(t)->TypeExpr(Unresolved(t))norm1:Name(n)->Name(<opname>n)norm2:AName(n,as)->AName(n,<map( x->Unresolved(x) )>as)norm1:Dummy(d)->dnorm1:IfThen(c,e)->If(c,e,Nop())norm1:PrintLn(es)->Call(Name("println"),[es’’])where<map(!Apply(Name("string"),[<id>]))>es=>es’;<foldr(!Literal(String("")),mkappend)>es’=>es’’norm1:Print(es)->Call(Name("print"),[es’’])where<map(!Apply(Name("string"),[<id>]))>es=>es’;<foldr(!Literal(String("\ ") ),mkappend)>es’=>e\ s’’mkappend:(e,Literal(String("")))->emkappend:(e1,e2)->Apply(Name(" ++ "),[e1,Apply(Name(" ++ "),[Literal(String("")),e2])])where<not(Literal(String("")))>e2norm\ \ 1:BinOp(e1,op,e2)->Apply(Name(<concat-strings>[" ",op," "]),[e1,e2])norm1:In(e1,e2)->Apply(Name(" in "),[e1,e2])norm1:NotIn(e1,e2)->Apply(Name(" notin "),[e1,e2])norm1:PreOp(op,e)->Apply(Name(<concat-strings>[op," "]),[e])norm1:Dec(s)->Int(<string-to-int>s)norm1:Hex(s)->Int(<hex-string-to-int>s)norm1:Oct(s)- >Int(<oct-string-to-int>s)norm1:Bin(s)->Int(<bin-string-to-int>s)norm1:Literal(l)->Literal(l,Unresolved())norm1:Var(v)->Var(v,Unresolved(),Upd())norm1:Index(e,as)->Apply(Name(" [ ]"),[e|as])norm1:Assign()->Name(" = ")norm1:Return()->Return(None())norm2:Struct(t,fs)->Struct(Unresolved(t),fs)norm2:Union(t,f)->Struct(Unresolved(t),f)norm2:LiteralTrue()->Literal(Bool(True()),Unresolved())norm2:LiteralFalse()->Literal(Bool(False()),Unresolved())norm2:ObsParam(t,n)->Param(n,Unresolved(t),Ob s())norm2:AnonParam(t)->Param(Name(" "),Unresolved(t),Obs())norm2:TypeOpParam(t)->Param(Name(" "),Unresolved(t),Typ())norm2:AnonParam(m,t)->Param(Name(" "),Unresolved(t),m)norm2:Param(m,t,n)->Param(n,Unresolved(t),m)norm2:Param(t,n)->Param(n,Unresolved(t),Obs())norm2:TypeExprParam(t,n)->Unresolved(Match(n,t))norm2:TypeExprParam(t)->Unresolved(Match(Name(" "),t))norm2:AnonTypeParam()->Unresolved(Match(Name(" "),Type()))norm2:TypeParam(t)->Unresolved(Match(t,Type()))norm2:AnonTypePParam (ts)->Unresolved(Type(Match(Name(" "),TypeFun(as)),ts))where<map( x->Type() )>ts=>asnorm2:TypePParam(t,ts)->Unresolved(Type(Match(t,TypeFun(as)),ts))where<try(norm1);map( x->Type() )>ts=>asnorm2=Block(filter(not(Nop())))norm2:Requires(n,ts,hp)->Requires(Unresolved(n),ts’,hp)where<map(!Unresolved(<id>))>ts=>ts’norm2:Hide(r)->rnorm2:TypeProtect(t,Some(b))->TypeProtect(Unresolved(t),b)norm2:OpProtect(FunClause(t,n,ps),Some(b))->OpProtect(Unresolved(Fun(n,t,ps)),b)norm2:Where(t1,t2)->Wher e(Unresolved(t1),Unresolved(t2))norm2:Apply(n,e)->Apply(Unresolved(n),e)norm2:Call(n,e)->Call(Unresolved(n),e)norm2:Open(vs,e)->Open(vs’,e)where<map(!Var(<id>,Unresolved(),Obs()))>vs=>vs’\ \ \ \ norm2:Assign(n,e)->Assign(Unresolved(n),e)norm2:FieldAssign(v,n,e)->FieldAssign(Unresolved(v),n,e)norm2:IndexedAssign(v,as,e)->IndexedAssign(Unresolved(v),as,e)norm2:VarDefTI(t,n,e)->Def(n,Var(n,Unresolved(t),Upd()),e,[])norm2:VarDefI(n,e)->Def(n,Var(n,None(),Upd()),e,[])norm2:VarDefT(t,n)->Def(n,Var( n,Unresolved(t),Upd()),None(),[])norm2:ConceptDef(n,ps,Some(bs),bd)->Def(n,Concept(n,ps,bs),bd,[])norm2:ConceptDef(n,ps,None(),bd)->Def(n,Concept(n,ps,[]),bd,[])norm2:AxiomDef(n,ps,bd)->Def(n,Axiom(n,ps,[]),bd,[])norm-forall:def@Def( , , , )->Def(n,sig,bd,[ForAll(ts’)|at])where<collect(MatchType(id))>def=>ts@[ | ];<alltd( MatchType(x)->x )>def=>Def(n,sig,bd,at);<map( MatchType(x)->Unresolved(Match(x,Type())) )>ts=>ts’norm-cxx:TmplDecl(Template(ps,rs),Def(n,sig,bd,at))->Def(n,sig,bd,<c oncat;debug>[[ForAll(<conc>(tts’,ps’))],rs,at])where<collect(TemplateType(id,id))>ps=>tts;<alltd( TemplateType( ,t)->Unresolved(Match(t,Type())) )>ps=>ps’;<map( TemplateType(ts, )->ts );concat>tts=>tts’norm-cxx:Def(n,Class(dn,ps),None(),at)->Def(n,Type(dn,ps),None(),at)norm-cxx:Def(n,Class(dn,ps),bd,at)->Def(n,Type(dn,ps),\ StructRep(bd),a\t)where<is-list>bdnorm2:DefDec\l(dclause,subs,bd)->Def(n,sig,bd’,subs’)where(n,sig):=<norm-decl-clause>dclause;s\ ubs’:=<norm-sub-clauses>subs;<try(Nop() ;!None())>bd=>bd’norm2:NoDefDecl(dclause,subs)->Def(n,sig,None(),subs’)where(n,sig):=<norm-decl-clause>dclause;subs’:=<norm-sub-clauses>subsnorm-decl-clause:FunClause(t,n,ps)->(n,Fun(n,Unresolved(t)\ \ \ \ ,ps))norm-decl-clause:FunClause(t,n)->(n,Fun(n,Unresolved(t),[]))norm-decl-clause:PredClause(n,ps)->(n,Fun(n,Unresolved(Name("bool")),ps))norm-decl-clause:ProcClause(n,ps)->(n,Proc(n,ps))norm-decl-clause:VarClause(t,n)->(n,Var(n,Unresolved(t),Upd()))norm-decl-clause:TypeClause(n,Some(ps))->
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