%
-% (c) The AQUA Project, Glasgow University, 1996
+% (c) The AQUA Project, Glasgow University, 1996-1998
%
\section[RnHsSyn]{Specialisations of the @HsSyn@ syntax for the renamer}
\begin{code}
-#include "HsVersions.h"
-
-module RnHsSyn where
+module RnHsSyn(
+ -- Names
+ charTyCon_name, listTyCon_name, parrTyCon_name, tupleTyCon_name,
+ extractHsTyVars, extractHsTyNames, extractHsTyNames_s,
+ extractFunDepNames, extractHsCtxtTyNames, extractHsPredTyNames,
+
+ -- Free variables
+ hsSigsFVs, hsSigFVs, conDeclFVs, bangTyFVs,
+
+ maybeGenericMatch
+ ) where
-import Ubiq
+#include "HsVersions.h"
import HsSyn
-
-import Id ( GenId, Id(..) )
-import Name ( isLocalName, nameUnique, Name, RdrName )
-import Outputable ( Outputable(..){-instance * []-} )
-import PprStyle ( PprStyle(..) )
-import PprType ( GenType, GenTyVar, TyCon )
-import Pretty
-import TyCon ( TyCon )
-import TyVar ( GenTyVar )
-import Unique ( Unique )
-import Util ( panic, pprPanic )
+import Class ( FunDep )
+import TysWiredIn ( tupleTyCon, listTyCon, parrTyCon, charTyCon )
+import Name ( Name, getName, isTyVarName )
+import NameSet
+import BasicTypes ( Boxity )
+import SrcLoc ( Located(..), unLoc )
\end{code}
+%************************************************************************
+%* *
+\subsection{Free variables}
+%* *
+%************************************************************************
+
+These free-variable finders returns tycons and classes too.
+
\begin{code}
-data RnName
- = WiredInId Id
- | WiredInTyCon TyCon
- | RnName Name -- funtions/binders/tyvars
- | RnSyn Name -- type synonym
- | RnData Name [Name] -- data type (with constrs)
- | RnConstr Name Name -- constructor (with data type)
- | RnClass Name [Name] -- class (with class ops)
- | RnClassOp Name Name -- class op (with class)
- | RnImplicit Name -- implicitly imported
- | RnImplicitTyCon Name -- implicitly imported
- | RnImplicitClass Name -- implicitly imported
- | RnUnbound RdrName -- place holder
-
-mkRnName = RnName
-mkRnImplicit = RnImplicit
-mkRnImplicitTyCon = RnImplicitTyCon
-mkRnImplicitClass = RnImplicitClass
-mkRnUnbound = RnUnbound
-
-isRnWired (WiredInId _) = True
-isRnWired (WiredInTyCon _) = True
-isRnWired _ = False
-
-isRnLocal (RnName n) = isLocalName n
-isRnLocal _ = False
-
-
-isRnTyCon (WiredInTyCon _) = True
-isRnTyCon (RnSyn _) = True
-isRnTyCon (RnData _ _) = True
-isRnTyCon (RnImplicitTyCon _) = True
-isRnTyCon _ = False
-
-isRnClass (RnClass _ _) = True
-isRnClass (RnImplicitClass _) = True
-isRnClass _ = False
-
-isRnClassOp cls (RnClassOp _ op_cls) = eqUniqsNamed cls op_cls
-isRnClassOp cls (RnImplicit _) = True -- ho hummm ...
-isRnClassOp cls _ = False
-
-isRnImplicit (RnImplicit _) = True
-isRnImplicit (RnImplicitTyCon _) = True
-isRnImplicit (RnImplicitClass _) = True
-isRnImplicit _ = False
-
-isRnUnbound (RnUnbound _) = True
-isRnUnbound _ = False
-
--- Very general NamedThing comparison, used when comparing
--- Uniquable things with different types
-
-eqUniqsNamed n1 n2 = uniqueOf n1 == uniqueOf n2
-cmpUniqsNamed n1 n2 = uniqueOf n1 `cmp` uniqueOf n2
-
-instance Eq RnName where
- a == b = eqUniqsNamed a b
-
-instance Ord3 RnName where
- a `cmp` b = cmpUniqsNamed a b
-
-instance Uniquable RnName where
- uniqueOf = nameUnique . getName
-
-instance NamedThing RnName where
- getName (WiredInId id) = getName id
- getName (WiredInTyCon tc) = getName tc
- getName (RnName n) = n
- getName (RnSyn n) = n
- getName (RnData n _) = n
- getName (RnConstr n _) = n
- getName (RnClass n _) = n
- getName (RnClassOp n _) = n
- getName (RnImplicit n) = n
- getName (RnUnbound occ) = pprPanic "getRnName:RnUnbound" (ppr PprDebug occ)
-
-instance Outputable RnName where
-#ifdef DEBUG
- ppr sty@PprShowAll (RnData n cs) = ppBesides [ppr sty n, ppStr "{-", ppr sty cs, ppStr "-}"]
- ppr sty@PprShowAll (RnConstr n d) = ppBesides [ppr sty n, ppStr "{-", ppr sty d, ppStr "-}"]
- ppr sty@PprShowAll (RnClass n ops) = ppBesides [ppr sty n, ppStr "{-", ppr sty ops, ppStr "-}"]
- ppr sty@PprShowAll (RnClassOp n c) = ppBesides [ppr sty n, ppStr "{-", ppr sty c, ppStr "-}"]
-#endif
- ppr sty (WiredInId id) = ppr sty id
- ppr sty (WiredInTyCon tycon)= ppr sty tycon
- ppr sty (RnUnbound occ) = ppBeside (ppr sty occ) (ppPStr SLIT("{-UNBOUND-}"))
- ppr sty rn_name = ppr sty (getName rn_name)
+charTyCon_name, listTyCon_name, parrTyCon_name :: Name
+charTyCon_name = getName charTyCon
+listTyCon_name = getName listTyCon
+parrTyCon_name = getName parrTyCon
+
+tupleTyCon_name :: Boxity -> Int -> Name
+tupleTyCon_name boxity n = getName (tupleTyCon boxity n)
+
+extractHsTyVars :: LHsType Name -> NameSet
+extractHsTyVars x = filterNameSet isTyVarName (extractHsTyNames x)
+
+extractFunDepNames :: FunDep Name -> NameSet
+extractFunDepNames (ns1, ns2) = mkNameSet ns1 `unionNameSets` mkNameSet ns2
+
+extractHsTyNames :: LHsType Name -> NameSet
+extractHsTyNames ty
+ = getl ty
+ where
+ getl (L _ ty) = get ty
+
+ get (HsAppTy ty1 ty2) = getl ty1 `unionNameSets` getl ty2
+ get (HsListTy ty) = unitNameSet listTyCon_name `unionNameSets` getl ty
+ get (HsPArrTy ty) = unitNameSet parrTyCon_name `unionNameSets` getl ty
+ get (HsTupleTy con tys) = extractHsTyNames_s tys
+ get (HsFunTy ty1 ty2) = getl ty1 `unionNameSets` getl ty2
+ get (HsPredTy p) = extractHsPredTyNames p
+ get (HsOpTy ty1 op ty2) = getl ty1 `unionNameSets` getl ty2 `unionNameSets` unitNameSet (unLoc op)
+ get (HsParTy ty) = getl ty
+ get (HsBangTy _ ty) = getl ty
+ get (HsNumTy n) = emptyNameSet
+ get (HsTyVar tv) = unitNameSet tv
+ get (HsSpliceTy _) = emptyNameSet -- Type splices mention no type variables
+ get (HsKindSig ty k) = getl ty
+ get (HsForAllTy _ tvs
+ ctxt ty) = (extractHsCtxtTyNames ctxt
+ `unionNameSets` getl ty)
+ `minusNameSet`
+ mkNameSet (hsLTyVarNames tvs)
+
+extractHsTyNames_s :: [LHsType Name] -> NameSet
+extractHsTyNames_s tys = foldr (unionNameSets . extractHsTyNames) emptyNameSet tys
+
+extractHsCtxtTyNames :: LHsContext Name -> NameSet
+extractHsCtxtTyNames (L _ ctxt)
+ = foldr (unionNameSets . extractHsPredTyNames . unLoc) emptyNameSet ctxt
+
+-- You don't import or export implicit parameters,
+-- so don't mention the IP names
+extractHsPredTyNames (HsClassP cls tys)
+ = unitNameSet cls `unionNameSets` extractHsTyNames_s tys
+extractHsPredTyNames (HsIParam n ty)
+ = extractHsTyNames ty
\end{code}
+
+%************************************************************************
+%* *
+\subsection{Free variables of declarations}
+%* *
+%************************************************************************
+
+Return the Names that must be in scope if we are to use this declaration.
+In all cases this is set up for interface-file declarations:
+ - for class decls we ignore the bindings
+ - for instance decls likewise, plus the pragmas
+ - for rule decls, we ignore HsRules
+ - for data decls, we ignore derivings
+
+ *** See "THE NAMING STORY" in HsDecls ****
+
\begin{code}
-type RenamedArithSeqInfo = ArithSeqInfo Fake Fake RnName RenamedPat
-type RenamedBind = Bind Fake Fake RnName RenamedPat
-type RenamedClassDecl = ClassDecl Fake Fake RnName RenamedPat
-type RenamedClassOpSig = Sig RnName
-type RenamedConDecl = ConDecl RnName
-type RenamedContext = Context RnName
-type RenamedSpecDataSig = SpecDataSig RnName
-type RenamedDefaultDecl = DefaultDecl RnName
-type RenamedFixityDecl = FixityDecl RnName
-type RenamedGRHS = GRHS Fake Fake RnName RenamedPat
-type RenamedGRHSsAndBinds = GRHSsAndBinds Fake Fake RnName RenamedPat
-type RenamedHsBinds = HsBinds Fake Fake RnName RenamedPat
-type RenamedHsExpr = HsExpr Fake Fake RnName RenamedPat
-type RenamedHsModule = HsModule Fake Fake RnName RenamedPat
-type RenamedInstDecl = InstDecl Fake Fake RnName RenamedPat
-type RenamedMatch = Match Fake Fake RnName RenamedPat
-type RenamedMonoBinds = MonoBinds Fake Fake RnName RenamedPat
-type RenamedMonoType = MonoType RnName
-type RenamedPat = InPat RnName
-type RenamedPolyType = PolyType RnName
-type RenamedRecordBinds = HsRecordBinds Fake Fake RnName RenamedPat
-type RenamedQual = Qual Fake Fake RnName RenamedPat
-type RenamedSig = Sig RnName
-type RenamedSpecInstSig = SpecInstSig RnName
-type RenamedStmt = Stmt Fake Fake RnName RenamedPat
-type RenamedTyDecl = TyDecl RnName
-
-type RenamedClassOpPragmas = ClassOpPragmas RnName
-type RenamedClassPragmas = ClassPragmas RnName
-type RenamedDataPragmas = DataPragmas RnName
-type RenamedGenPragmas = GenPragmas RnName
-type RenamedInstancePragmas = InstancePragmas RnName
+----------------
+hsSigsFVs :: [LSig Name] -> FreeVars
+hsSigsFVs sigs = plusFVs (map (hsSigFVs.unLoc) sigs)
+
+hsSigFVs (Sig v ty) = extractHsTyNames ty
+hsSigFVs (SpecInstSig ty) = extractHsTyNames ty
+hsSigFVs (SpecSig v ty) = extractHsTyNames ty
+hsSigFVs other = emptyFVs
+
+----------------
+-- XXX - autrijus - handle return type for GADT
+conDeclFVs (L _ (ConDecl _ _ tyvars context details _))
+ = delFVs (map hsLTyVarName tyvars) $
+ extractHsCtxtTyNames context `plusFV`
+ conDetailsFVs details
+
+{-
+-- gaw 2004
+conDeclFVs (L _ (GadtDecl _ ty))
+ = extractHsTyNames ty
+-}
+
+conDetailsFVs (PrefixCon btys) = plusFVs (map bangTyFVs btys)
+conDetailsFVs (InfixCon bty1 bty2) = bangTyFVs bty1 `plusFV` bangTyFVs bty2
+conDetailsFVs (RecCon flds) = plusFVs [bangTyFVs bty | (_, bty) <- flds]
+
+bangTyFVs bty = extractHsTyNames (getBangType bty)
\end{code}
+
+%************************************************************************
+%* *
+\subsection{A few functions on generic defintions
+%* *
+%************************************************************************
+
+These functions on generics are defined over Matches Name, which is
+why they are here and not in HsMatches.
+
\begin{code}
-collectQualBinders :: [RenamedQual] -> [RnName]
+maybeGenericMatch :: LMatch Name -> Maybe (HsType Name, LMatch Name)
+ -- Tells whether a Match is for a generic definition
+ -- and extract the type from a generic match and put it at the front
-collectQualBinders quals
- = concat (map collect quals)
- where
- collect (GeneratorQual pat _) = collectPatBinders pat
- collect (FilterQual expr) = []
- collect (LetQual binds) = collectTopLevelBinders binds
-\end{code}
+maybeGenericMatch (L loc (Match (L _ (TypePat (L _ ty)) : pats) sig_ty grhss))
+ = Just (ty, L loc (Match pats sig_ty grhss))
+maybeGenericMatch other_match = Nothing
+\end{code}
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