+++ /dev/null
-%
-% (c) The AQUA Project, Glasgow University, 1996-1998
-%
-\section[RnHsSyn]{Specialisations of the @HsSyn@ syntax for the renamer}
-
-\begin{code}
-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
-
-#include "HsVersions.h"
-
-import HsSyn
-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}
-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}
-----------------
-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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