%
-% (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(
+ -- Names
+ charTyCon_name, listTyCon_name, parrTyCon_name, tupleTyCon_name,
+ extractHsTyVars, extractHsTyNames, extractHsTyNames_s,
+ extractFunDepNames, extractHsCtxtTyNames, extractHsPredTyNames,
-module RnHsSyn where
+ -- Free variables
+ hsSigsFVs, hsSigFVs, conDeclFVs, bangTyFVs,
+
+ maybeGenericMatch
+ ) where
-IMP_Ubiq()
+#include "HsVersions.h"
import HsSyn
-
-import Id ( GenId, SYN_IE(Id) )
-import Name ( Name )
-import Outputable ( Outputable(..){-instance * []-} )
-import PprStyle ( PprStyle(..) )
-import PprType ( GenType, GenTyVar, TyCon )
-import Pretty
-import Name ( SYN_IE(NameSet), unitNameSet, mkNameSet, minusNameSet, unionNameSets, emptyNameSet )
-import TyCon ( TyCon )
-import TyVar ( GenTyVar )
-import Unique ( Unique )
-import Util ( panic, pprPanic{-, pprTrace ToDo:rm-} )
-\end{code}
-
-
-\begin{code}
-type RenamedArithSeqInfo = ArithSeqInfo Fake Fake Name RenamedPat
-type RenamedBind = Bind Fake Fake Name RenamedPat
-type RenamedClassDecl = ClassDecl Fake Fake Name RenamedPat
-type RenamedClassOpSig = Sig Name
-type RenamedConDecl = ConDecl Name
-type RenamedContext = Context Name
-type RenamedHsDecl = HsDecl Fake Fake Name RenamedPat
-type RenamedSpecDataSig = SpecDataSig Name
-type RenamedDefaultDecl = DefaultDecl Name
-type RenamedFixityDecl = FixityDecl Name
-type RenamedGRHS = GRHS Fake Fake Name RenamedPat
-type RenamedGRHSsAndBinds = GRHSsAndBinds Fake Fake Name RenamedPat
-type RenamedHsBinds = HsBinds Fake Fake Name RenamedPat
-type RenamedHsExpr = HsExpr Fake Fake Name RenamedPat
-type RenamedHsModule = HsModule Fake Fake Name RenamedPat
-type RenamedInstDecl = InstDecl Fake Fake Name RenamedPat
-type RenamedMatch = Match Fake Fake Name RenamedPat
-type RenamedMonoBinds = MonoBinds Fake Fake Name RenamedPat
-type RenamedPat = InPat Name
-type RenamedHsType = HsType Name
-type RenamedRecordBinds = HsRecordBinds Fake Fake Name RenamedPat
-type RenamedQual = Qualifier Fake Fake Name RenamedPat
-type RenamedSig = Sig Name
-type RenamedSpecInstSig = SpecInstSig Name
-type RenamedStmt = Stmt Fake Fake Name RenamedPat
-type RenamedTyDecl = TyDecl Name
-
-type RenamedClassOpPragmas = ClassOpPragmas Name
-type RenamedClassPragmas = ClassPragmas Name
-type RenamedDataPragmas = DataPragmas Name
-type RenamedGenPragmas = GenPragmas Name
-type RenamedInstancePragmas = InstancePragmas Name
+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}
%************************************************************************
%* *
%************************************************************************
+These free-variable finders returns tycons and classes too.
+
\begin{code}
-extractCtxtTyNames :: RenamedContext -> NameSet
-extractCtxtTyNames ctxt = foldr (unionNameSets . extractHsTyNames . snd) emptyNameSet ctxt
+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 :: RenamedHsType -> NameSet
+extractHsTyNames :: LHsType Name -> NameSet
extractHsTyNames ty
- = get ty
+ = getl ty
where
- get (MonoTyApp con tys) = foldr (unionNameSets . get) (unitNameSet con) tys
- get (MonoListTy tc ty) = unitNameSet tc `unionNameSets` get ty
- get (MonoTupleTy tc tys) = foldr (unionNameSets . get) (unitNameSet tc) tys
- get (MonoFunTy ty1 ty2) = get ty1 `unionNameSets` get ty2
- get (MonoDictTy cls ty) = unitNameSet cls `unionNameSets` get ty
- get (MonoTyVar tv) = unitNameSet tv
- get (HsForAllTy tvs ctxt ty) = foldr (unionNameSets . get . snd) (get ty) ctxt
+ 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 (map getTyVarName tvs)
+ 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}
+----------------
+hsSigsFVs :: [LSig Name] -> FreeVars
+hsSigsFVs sigs = plusFVs (map (hsSigFVs.unLoc) sigs)
+
+hsSigFVs (TypeSig v ty) = extractHsTyNames ty
+hsSigFVs (SpecInstSig ty) = extractHsTyNames ty
+hsSigFVs (SpecSig v ty inl) = extractHsTyNames ty
+hsSigFVs other = emptyFVs
+
+----------------
+conDeclFVs (L _ (ConDecl { con_qvars = tyvars, con_cxt = context,
+ con_details = details, con_res = res_ty}))
+ = delFVs (map hsLTyVarName tyvars) $
+ extractHsCtxtTyNames context `plusFV`
+ conDetailsFVs details `plusFV`
+ conResTyFVs res_ty
+
+conResTyFVs ResTyH98 = emptyFVs
+conResTyFVs (ResTyGADT 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}
+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
+
+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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