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|
definition module Snug.Syntax
from Data.Set import :: Set
:: TypeIdent :== String
:: TypeVarIdent :== String
:: ConstructorIdent :== String
:: SymbolIdent :== String
:: Type
= Type !TypeIdent
| TyVar !TypeVarIdent
| TyApp !Type !Type
| TyFun !Type !Type
| ..
:: ConstructorDef
= ConstructorDef !ConstructorIdent ![Type]
:: BasicValue
= BVInt !Int
| BVChar !Char
:: Pattern
= Wildcard
| BasicValuePattern !BasicValue
| IdentPattern !SymbolIdent
| ConstructorPattern !ConstructorIdent ![SymbolIdent]
:: CaseAlternative
= CaseAlternative !Pattern !Expression
:: Expression
= BasicValue !BasicValue
| Symbol !SymbolIdent
| Constructor !ConstructorIdent
| Case !Expression ![CaseAlternative]
| ExpApp !Expression !Expression
:: Definition
= DataDef !TypeIdent ![TypeVarIdent] ![ConstructorDef]
| TypeDef !TypeIdent !Type
| FunDef !SymbolIdent ![(SymbolIdent, Type)] !Type !Expression
| TestDef !String !Type !Expression !String
class usedSymbols a :: !a -> Set SymbolIdent
instance usedSymbols [a] | usedSymbols a
instance usedSymbols (a, b) | usedSymbols a & usedSymbols b
instance usedSymbols CaseAlternative, Expression, Pattern
|
