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|
% -----------------------------------------------------------------------------
%
% (c) The GHC Team, 1997-2000
%
% A suite of datatypes describing the abstract syntax of Haskell 98.
%
% -----------------------------------------------------------------------------
> module HsSyn (
> SrcLoc(..), Module(..), HsQName(..), HsName(..),
> HsModule(..), HsExportSpec(..),
> HsImportDecl(..), HsImportSpec(..), HsAssoc(..),
> HsDecl(..), HsMatch(..), HsConDecl(..), HsBangType(..), HsRhs(..),
> HsGuardedRhs(..), HsQualType(..), HsType(..), HsContext, HsAsst,
> HsLiteral(..), HsExp(..), HsPat(..), HsPatField(..), HsStmt(..),
> HsFieldUpdate(..), HsAlt(..), HsGuardedAlts(..), HsGuardedAlt(..),
>
> prelude_mod, main_mod,
> unit_con_name, tuple_con_name,
> unit_con, tuple_con,
> as_name, qualified_name, hiding_name, minus_name, pling_name,
> unit_tycon_name, fun_tycon_name, list_tycon_name, tuple_tycon_name,
> unit_tycon, fun_tycon, list_tycon, tuple_tycon,
> ) where
> data SrcLoc = SrcLoc Int Int -- (Line, Indentation)
> deriving (Eq,Ord,Show)
>
> newtype Module = Module String
> deriving (Eq,Ord,Show)
>
> data HsQName
> = Qual Module HsName
> | UnQual HsName
> deriving (Eq,Ord)
>
> instance Show HsQName where
> showsPrec _ (Qual (Module m) s) =
> showString m . showString "." . shows s
> showsPrec _ (UnQual s) = shows s
>
> data HsName
> = HsIdent String
> | HsSymbol String
> | HsSpecial String
> deriving (Eq,Ord)
>
> instance Show HsName where
> showsPrec _ (HsIdent s) = showString s
> showsPrec _ (HsSymbol s) = showString s
> showsPrec _ (HsSpecial s) = showString s
>
> data HsModule = HsModule Module (Maybe [HsExportSpec])
> [HsImportDecl] [HsDecl]
> deriving Show
Export/Import Specifications.
> data HsExportSpec
> = HsEVar HsQName -- variable
> | HsEAbs HsQName -- T
> | HsEThingAll HsQName -- T(..)
> | HsEThingWith HsQName [HsQName] -- T(C_1,...,C_n)
> | HsEModuleContents Module -- module M (not for imports)
> deriving (Eq,Show)
>
> data HsImportDecl
> = HsImportDecl SrcLoc Module Bool (Maybe Module)
> (Maybe (Bool,[HsImportSpec]))
> deriving (Eq,Show)
>
> data HsImportSpec
> = HsIVar HsName -- variable
> | HsIAbs HsName -- T
> | HsIThingAll HsName -- T(..)
> | HsIThingWith HsName [HsName] -- T(C_1,...,C_n)
> deriving (Eq,Show)
>
> data HsAssoc
> = HsAssocNone
> | HsAssocLeft
> | HsAssocRight
> deriving (Eq,Show)
>
> data HsDecl
> = HsTypeDecl SrcLoc HsName [HsName] HsType
> | HsDataDecl SrcLoc HsContext HsName [HsName] [HsConDecl] [HsQName]
> | HsInfixDecl SrcLoc HsAssoc Int [HsName]
> | HsNewTypeDecl SrcLoc HsContext HsName [HsName] HsConDecl [HsQName]
> | HsClassDecl SrcLoc HsQualType [HsDecl]
> | HsInstDecl SrcLoc HsQualType [HsDecl]
> | HsDefaultDecl SrcLoc HsType
> | HsTypeSig SrcLoc [HsName] HsQualType
> | HsFunBind SrcLoc [HsMatch]
> | HsPatBind SrcLoc HsPat HsRhs {-where-} [HsDecl]
> deriving (Eq,Show)
>
> data HsMatch
> = HsMatch SrcLoc HsQName [HsPat] HsRhs {-where-} [HsDecl]
> deriving (Eq,Show)
>
> data HsConDecl
> = HsConDecl SrcLoc HsName [HsBangType]
> | HsRecDecl SrcLoc HsName [([HsName],HsBangType)]
> deriving (Eq,Show)
>
> data HsBangType
> = HsBangedTy HsType
> | HsUnBangedTy HsType
> deriving (Eq,Show)
>
> data HsRhs
> = HsUnGuardedRhs HsExp
> | HsGuardedRhss [HsGuardedRhs]
> deriving (Eq,Show)
>
> data HsGuardedRhs
> = HsGuardedRhs SrcLoc HsExp HsExp
> deriving (Eq,Show)
>
> data HsQualType
> = HsQualType HsContext HsType
> | HsUnQualType HsType
> deriving (Eq,Show)
>
> data HsType
> = HsTyFun HsType HsType
> | HsTyTuple [HsType]
> | HsTyApp HsType HsType
> | HsTyVar HsName
> | HsTyCon HsQName
> deriving (Eq,Show)
>
> type HsContext = [HsAsst]
> type HsAsst = (HsQName,[HsType]) -- for multi-parameter type classes
>
> data HsLiteral
> = HsInt Integer
> | HsChar Char
> | HsString String
> | HsFrac Rational
> -- GHC unboxed literals:
> | HsCharPrim Char
> | HsStringPrim String
> | HsIntPrim Integer
> | HsFloatPrim Rational
> | HsDoublePrim Rational
> -- GHC extension:
> | HsLitLit String
> deriving (Eq, Show)
>
> data HsExp
> = HsVar HsQName
> | HsCon HsQName
> | HsLit HsLiteral
> | HsInfixApp HsExp HsExp HsExp
> | HsApp HsExp HsExp
> | HsNegApp HsExp
> | HsLambda [HsPat] HsExp
> | HsLet [HsDecl] HsExp
> | HsIf HsExp HsExp HsExp
> | HsCase HsExp [HsAlt]
> | HsDo [HsStmt]
> | HsTuple [HsExp]
> | HsList [HsExp]
> | HsParen HsExp
> | HsLeftSection HsExp HsExp
> | HsRightSection HsExp HsExp
> | HsRecConstr HsQName [HsFieldUpdate]
> | HsRecUpdate HsExp [HsFieldUpdate]
> | HsEnumFrom HsExp
> | HsEnumFromTo HsExp HsExp
> | HsEnumFromThen HsExp HsExp
> | HsEnumFromThenTo HsExp HsExp HsExp
> | HsListComp HsExp [HsStmt]
> | HsExpTypeSig SrcLoc HsExp HsQualType
> | HsAsPat HsName HsExp -- pattern only
> | HsWildCard -- ditto
> | HsIrrPat HsExp -- ditto
> -- HsCCall (ghc extension)
> -- HsSCC (ghc extension)
> deriving (Eq,Show)
>
> data HsPat
> = HsPVar HsName
> | HsPLit HsLiteral
> | HsPNeg HsPat
> | HsPInfixApp HsPat HsQName HsPat
> | HsPApp HsQName [HsPat]
> | HsPTuple [HsPat]
> | HsPList [HsPat]
> | HsPParen HsPat
> | HsPRec HsQName [HsPatField]
> | HsPAsPat HsName HsPat
> | HsPWildCard
> | HsPIrrPat HsPat
> deriving (Eq,Show)
>
> data HsPatField
> = HsPFieldPat HsQName HsPat
> deriving (Eq,Show)
>
> data HsStmt
> = HsGenerator HsPat HsExp
> | HsQualifier HsExp
> | HsLetStmt [HsDecl]
> deriving (Eq,Show)
>
> data HsFieldUpdate
> = HsFieldUpdate HsQName HsExp
> deriving (Eq,Show)
>
> data HsAlt
> = HsAlt SrcLoc HsPat HsGuardedAlts [HsDecl]
> deriving (Eq,Show)
>
> data HsGuardedAlts
> = HsUnGuardedAlt HsExp
> | HsGuardedAlts [HsGuardedAlt]
> deriving (Eq,Show)
>
> data HsGuardedAlt
> = HsGuardedAlt SrcLoc HsExp HsExp
> deriving (Eq,Show)
Builtin names.
> prelude_mod = Module "Prelude"
> main_mod = Module "Main"
>
> unit_con_name = Qual prelude_mod (HsSpecial "()")
> tuple_con_name i = Qual prelude_mod (HsSpecial ("("++replicate i ','++")"))
>
> unit_con = HsCon unit_con_name
> tuple_con i = HsCon (tuple_con_name i)
>
> as_name = HsIdent "as"
> qualified_name = HsIdent "qualified"
> hiding_name = HsIdent "hiding"
> minus_name = HsSymbol "-"
> pling_name = HsSymbol "!"
>
> unit_tycon_name = unit_con_name
> fun_tycon_name = Qual prelude_mod (HsSymbol "->")
> list_tycon_name = Qual prelude_mod (HsIdent "[]")
> tuple_tycon_name i = tuple_con_name i
>
> unit_tycon = HsTyCon unit_tycon_name
> fun_tycon = HsTyCon fun_tycon_name
> list_tycon = HsTyCon list_tycon_name
> tuple_tycon i = HsTyCon (tuple_tycon_name i)
|
