2 % (c) The AQUA Project, Glasgow University, 1996-1998
4 \section[RnHsSyn]{Specialisations of the @HsSyn@ syntax for the renamer}
9 charTyCon_name, listTyCon_name, parrTyCon_name, tupleTyCon_name,
10 extractHsTyVars, extractHsTyNames, extractHsTyNames_s,
11 extractFunDepNames, extractHsCtxtTyNames, extractHsPredTyNames,
14 hsSigsFVs, hsSigFVs, conDeclFVs, bangTyFVs,
19 #include "HsVersions.h"
22 import Class ( FunDep )
23 import TysWiredIn ( tupleTyCon, listTyCon, parrTyCon, charTyCon )
24 import Name ( Name, getName, isTyVarName )
26 import BasicTypes ( Boxity )
27 import SrcLoc ( Located(..), unLoc )
30 %************************************************************************
32 \subsection{Free variables}
34 %************************************************************************
36 These free-variable finders returns tycons and classes too.
39 charTyCon_name, listTyCon_name, parrTyCon_name :: Name
40 charTyCon_name = getName charTyCon
41 listTyCon_name = getName listTyCon
42 parrTyCon_name = getName parrTyCon
44 tupleTyCon_name :: Boxity -> Int -> Name
45 tupleTyCon_name boxity n = getName (tupleTyCon boxity n)
47 extractHsTyVars :: LHsType Name -> NameSet
48 extractHsTyVars x = filterNameSet isTyVarName (extractHsTyNames x)
50 extractFunDepNames :: FunDep Name -> NameSet
51 extractFunDepNames (ns1, ns2) = mkNameSet ns1 `unionNameSets` mkNameSet ns2
53 extractHsTyNames :: LHsType Name -> NameSet
57 getl (L _ ty) = get ty
59 get (HsAppTy ty1 ty2) = getl ty1 `unionNameSets` getl ty2
60 get (HsListTy ty) = unitNameSet listTyCon_name `unionNameSets` getl ty
61 get (HsPArrTy ty) = unitNameSet parrTyCon_name `unionNameSets` getl ty
62 get (HsTupleTy _ tys) = extractHsTyNames_s tys
63 get (HsFunTy ty1 ty2) = getl ty1 `unionNameSets` getl ty2
64 get (HsPredTy p) = extractHsPredTyNames p
65 get (HsOpTy ty1 op ty2) = getl ty1 `unionNameSets` getl ty2 `unionNameSets` unitNameSet (unLoc op)
66 get (HsParTy ty) = getl ty
67 get (HsBangTy _ ty) = getl ty
68 get (HsRecTy flds) = extractHsTyNames_s (map cd_fld_type flds)
69 get (HsNumTy _) = emptyNameSet
70 get (HsTyVar tv) = unitNameSet tv
71 get (HsSpliceTy _) = emptyNameSet -- Type splices mention no type variables
72 get (HsKindSig ty _) = getl ty
74 ctxt ty) = (extractHsCtxtTyNames ctxt
75 `unionNameSets` getl ty)
77 mkNameSet (hsLTyVarNames tvs)
78 get (HsDocTy ty _) = getl ty
80 extractHsTyNames_s :: [LHsType Name] -> NameSet
81 extractHsTyNames_s tys = foldr (unionNameSets . extractHsTyNames) emptyNameSet tys
83 extractHsCtxtTyNames :: LHsContext Name -> NameSet
84 extractHsCtxtTyNames (L _ ctxt)
85 = foldr (unionNameSets . extractHsPredTyNames . unLoc) emptyNameSet ctxt
87 -- You don't import or export implicit parameters,
88 -- so don't mention the IP names
89 extractHsPredTyNames :: HsPred Name -> NameSet
90 extractHsPredTyNames (HsClassP cls tys)
91 = unitNameSet cls `unionNameSets` extractHsTyNames_s tys
92 extractHsPredTyNames (HsEqualP ty1 ty2)
93 = extractHsTyNames ty1 `unionNameSets` extractHsTyNames ty2
94 extractHsPredTyNames (HsIParam _ ty)
99 %************************************************************************
101 \subsection{Free variables of declarations}
103 %************************************************************************
105 Return the Names that must be in scope if we are to use this declaration.
106 In all cases this is set up for interface-file declarations:
107 - for class decls we ignore the bindings
108 - for instance decls likewise, plus the pragmas
109 - for rule decls, we ignore HsRules
110 - for data decls, we ignore derivings
112 *** See "THE NAMING STORY" in HsDecls ****
116 hsSigsFVs :: [LSig Name] -> FreeVars
117 hsSigsFVs sigs = plusFVs (map (hsSigFVs.unLoc) sigs)
119 hsSigFVs :: Sig Name -> FreeVars
120 hsSigFVs (TypeSig _ ty) = extractHsTyNames ty
121 hsSigFVs (SpecInstSig ty) = extractHsTyNames ty
122 hsSigFVs (SpecSig _ ty _) = extractHsTyNames ty
123 hsSigFVs _ = emptyFVs
126 conDeclFVs :: LConDecl Name -> FreeVars
127 conDeclFVs (L _ (ConDecl { con_qvars = tyvars, con_cxt = context,
128 con_details = details, con_res = res_ty}))
129 = delFVs (map hsLTyVarName tyvars) $
130 extractHsCtxtTyNames context `plusFV`
131 conDetailsFVs details `plusFV`
134 conResTyFVs :: ResType Name -> FreeVars
135 conResTyFVs ResTyH98 = emptyFVs
136 conResTyFVs (ResTyGADT ty) = extractHsTyNames ty
138 conDetailsFVs :: HsConDeclDetails Name -> FreeVars
139 conDetailsFVs details = plusFVs (map bangTyFVs (hsConDeclArgTys details))
141 bangTyFVs :: LHsType Name -> FreeVars
142 bangTyFVs bty = extractHsTyNames (getBangType bty)
146 %************************************************************************
148 \subsection{A few functions on generic defintions
150 %************************************************************************
152 These functions on generics are defined over Matches Name, which is
153 why they are here and not in HsMatches.
156 maybeGenericMatch :: LMatch Name -> Maybe (HsType Name, LMatch Name)
157 -- Tells whether a Match is for a generic definition
158 -- and extract the type from a generic match and put it at the front
160 maybeGenericMatch (L loc (Match (L _ (TypePat (L _ ty)) : pats) sig_ty grhss))
161 = Just (ty, L loc (Match pats sig_ty grhss))
163 maybeGenericMatch _ = Nothing