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 (HsSpliceTyOut {}) = emptyNameSet -- Ditto
73 get (HsKindSig ty _) = getl ty
75 ctxt ty) = (extractHsCtxtTyNames ctxt
76 `unionNameSets` getl ty)
78 mkNameSet (hsLTyVarNames tvs)
79 get (HsDocTy ty _) = getl ty
81 extractHsTyNames_s :: [LHsType Name] -> NameSet
82 extractHsTyNames_s tys = foldr (unionNameSets . extractHsTyNames) emptyNameSet tys
84 extractHsCtxtTyNames :: LHsContext Name -> NameSet
85 extractHsCtxtTyNames (L _ ctxt)
86 = foldr (unionNameSets . extractHsPredTyNames . unLoc) emptyNameSet ctxt
88 -- You don't import or export implicit parameters,
89 -- so don't mention the IP names
90 extractHsPredTyNames :: HsPred Name -> NameSet
91 extractHsPredTyNames (HsClassP cls tys)
92 = unitNameSet cls `unionNameSets` extractHsTyNames_s tys
93 extractHsPredTyNames (HsEqualP ty1 ty2)
94 = extractHsTyNames ty1 `unionNameSets` extractHsTyNames ty2
95 extractHsPredTyNames (HsIParam _ ty)
100 %************************************************************************
102 \subsection{Free variables of declarations}
104 %************************************************************************
106 Return the Names that must be in scope if we are to use this declaration.
107 In all cases this is set up for interface-file declarations:
108 - for class decls we ignore the bindings
109 - for instance decls likewise, plus the pragmas
110 - for rule decls, we ignore HsRules
111 - for data decls, we ignore derivings
113 *** See "THE NAMING STORY" in HsDecls ****
117 hsSigsFVs :: [LSig Name] -> FreeVars
118 hsSigsFVs sigs = plusFVs (map (hsSigFVs.unLoc) sigs)
120 hsSigFVs :: Sig Name -> FreeVars
121 hsSigFVs (TypeSig _ ty) = extractHsTyNames ty
122 hsSigFVs (SpecInstSig ty) = extractHsTyNames ty
123 hsSigFVs (SpecSig _ ty _) = extractHsTyNames ty
124 hsSigFVs _ = emptyFVs
127 conDeclFVs :: LConDecl Name -> FreeVars
128 conDeclFVs (L _ (ConDecl { con_qvars = tyvars, con_cxt = context,
129 con_details = details, con_res = res_ty}))
130 = delFVs (map hsLTyVarName tyvars) $
131 extractHsCtxtTyNames context `plusFV`
132 conDetailsFVs details `plusFV`
135 conResTyFVs :: ResType Name -> FreeVars
136 conResTyFVs ResTyH98 = emptyFVs
137 conResTyFVs (ResTyGADT ty) = extractHsTyNames ty
139 conDetailsFVs :: HsConDeclDetails Name -> FreeVars
140 conDetailsFVs details = plusFVs (map bangTyFVs (hsConDeclArgTys details))
142 bangTyFVs :: LHsType Name -> FreeVars
143 bangTyFVs bty = extractHsTyNames (getBangType bty)
147 %************************************************************************
149 \subsection{A few functions on generic defintions
151 %************************************************************************
153 These functions on generics are defined over Matches Name, which is
154 why they are here and not in HsMatches.
157 maybeGenericMatch :: LMatch Name -> Maybe (HsType Name, LMatch Name)
158 -- Tells whether a Match is for a generic definition
159 -- and extract the type from a generic match and put it at the front
161 maybeGenericMatch (L loc (Match (L _ (TypePat (L _ ty)) : pats) sig_ty grhss))
162 = Just (ty, L loc (Match pats sig_ty grhss))
164 maybeGenericMatch _ = Nothing