HsDecl(..), LHsDecl, TyClDecl(..), LTyClDecl,
InstDecl(..), LInstDecl, NewOrData(..),
RuleDecl(..), LRuleDecl, RuleBndr(..),
- DefaultDecl(..), LDefaultDecl, HsGroup(..), SpliceDecl(..),
+ DefaultDecl(..), LDefaultDecl, SpliceDecl(..),
ForeignDecl(..), LForeignDecl, ForeignImport(..), ForeignExport(..),
CImportSpec(..), FoType(..),
- ConDecl(..), LConDecl,
+ ConDecl(..), ResType(..), LConDecl,
DeprecDecl(..), LDeprecDecl,
+ HsGroup(..), emptyRdrGroup, emptyRnGroup, appendGroups,
tcdName, tyClDeclNames, tyClDeclTyVars,
isClassDecl, isSynDecl, isDataDecl,
countTyClDecls,
import {-# SOURCE #-} HsExpr( HsExpr, pprExpr )
-- Because Expr imports Decls via HsBracket
-import HsBinds ( HsBindGroup, HsBind, LHsBinds,
- Sig(..), LSig, LFixitySig, pprLHsBinds )
+import HsBinds ( HsValBinds(..), HsBind, LHsBinds, plusHsValBinds,
+ Sig(..), LSig, LFixitySig, pprLHsBinds,
+ emptyValBindsIn, emptyValBindsOut )
import HsPat ( HsConDetails(..), hsConArgs )
import HsImpExp ( pprHsVar )
import HsTypes
import Class ( FunDep )
import Outputable
import Util ( count )
-import SrcLoc ( Located(..), unLoc )
+import SrcLoc ( Located(..), unLoc, noLoc )
import FastString
\end{code}
-- fed to the renamer.
data HsGroup id
= HsGroup {
- hs_valds :: [HsBindGroup id],
- -- Before the renamer, this is a single big HsBindGroup,
- -- with all the bindings, and all the signatures.
- -- The renamer does dependency analysis, splitting it up
- -- into several HsBindGroups.
-
+ hs_valds :: HsValBinds id,
hs_tyclds :: [LTyClDecl id],
hs_instds :: [LInstDecl id],
hs_depds :: [LDeprecDecl id],
hs_ruleds :: [LRuleDecl id]
}
+
+emptyGroup, emptyRdrGroup, emptyRnGroup :: HsGroup a
+emptyRdrGroup = emptyGroup { hs_valds = emptyValBindsIn }
+emptyRnGroup = emptyGroup { hs_valds = emptyValBindsOut }
+
+emptyGroup = HsGroup { hs_tyclds = [], hs_instds = [],
+ hs_fixds = [], hs_defds = [], hs_fords = [],
+ hs_depds = [], hs_ruleds = [],
+ hs_valds = error "emptyGroup hs_valds: Can't happen" }
+
+appendGroups :: HsGroup a -> HsGroup a -> HsGroup a
+appendGroups
+ HsGroup {
+ hs_valds = val_groups1,
+ hs_tyclds = tyclds1,
+ hs_instds = instds1,
+ hs_fixds = fixds1,
+ hs_defds = defds1,
+ hs_fords = fords1,
+ hs_depds = depds1,
+ hs_ruleds = rulds1 }
+ HsGroup {
+ hs_valds = val_groups2,
+ hs_tyclds = tyclds2,
+ hs_instds = instds2,
+ hs_fixds = fixds2,
+ hs_defds = defds2,
+ hs_fords = fords2,
+ hs_depds = depds2,
+ hs_ruleds = rulds2 }
+ =
+ HsGroup {
+ hs_valds = val_groups1 `plusHsValBinds` val_groups2,
+ hs_tyclds = tyclds1 ++ tyclds2,
+ hs_instds = instds1 ++ instds2,
+ hs_fixds = fixds1 ++ fixds2,
+ hs_defds = defds1 ++ defds2,
+ hs_fords = fords1 ++ fords2,
+ hs_depds = depds1 ++ depds2,
+ hs_ruleds = rulds1 ++ rulds2 }
\end{code}
\begin{code}
-- (only for the 'where' form)
tcdCons :: [LConDecl name], -- Data constructors
- -- For data T a = T1 | T2 a the LConDecls are all ConDecls
- -- For data T a where { T1 :: T a } the LConDecls are all GadtDecls
+ -- For data T a = T1 | T2 a the LConDecls all have ResTyH98
+ -- For data T a where { T1 :: T a } the LConDecls all have ResTyGADT
tcdDerivs :: Maybe [LHsType name]
-- Derivings; Nothing => not specified
tyClDeclNames (ForeignType {tcdLName = name}) = [name]
tyClDeclNames (ClassDecl {tcdLName = cls_name, tcdSigs = sigs})
- = cls_name : [n | L _ (Sig n _) <- sigs]
+ = cls_name : [n | L _ (TypeSig n _) <- sigs]
tyClDeclNames (TyData {tcdLName = tc_name, tcdCons = cons})
= tc_name : conDeclsNames (map unLoc cons)
-> SDoc
pp_decl_head context thing tyvars
= hsep [pprHsContext context, ppr thing, interppSP tyvars]
-
-pp_condecls cs@(L _ (GadtDecl _ _) : _) -- In GADT syntax
+pp_condecls cs@(L _ ConDecl{ con_res = ResTyGADT _ } : _) -- In GADT syntax
= hang (ptext SLIT("where")) 2 (vcat (map ppr cs))
pp_condecls cs -- In H98 syntax
= equals <+> sep (punctuate (ptext SLIT(" |")) (map ppr cs))
\begin{code}
type LConDecl name = Located (ConDecl name)
+-- data T b = forall a. Eq a => MkT a b
+-- MkT :: forall b a. Eq a => MkT a b
+
+-- data T b where
+-- MkT1 :: Int -> T Int
+
+-- data T = Int `MkT` Int
+-- | MkT2
+
+-- data T a where
+-- Int `MkT` Int :: T Int
+
data ConDecl name
- = ConDecl (Located name) -- Constructor name; this is used for the
- -- DataCon itself, and for the user-callable wrapper Id
-
- [LHsTyVarBndr name] -- Existentially quantified type variables
- (LHsContext name) -- ...and context
- -- If both are empty then there are no existentials
- (HsConDetails name (LBangType name))
-
- | GadtDecl (Located name) -- Constructor name; this is used for the
- -- DataCon itself, and for the user-callable wrapper Id
- (LHsType name) -- Constructor type; it may have HsBangs on the
- -- argument types
+ = ConDecl
+ { con_name :: Located name -- Constructor name; this is used for the
+ -- DataCon itself, and for the user-callable wrapper Id
+
+ , con_explicit :: HsExplicitForAll -- Is there an user-written forall? (cf. HStypes.HsForAllTy)
+
+ , con_qvars :: [LHsTyVarBndr name] -- ResTyH98: the constructor's existential type variables
+ -- ResTyGADT: all the constructor's quantified type variables
+
+ , con_cxt :: LHsContext name -- The context. This *does not* include the
+ -- "stupid theta" which lives only in the TyData decl
+
+ , con_details :: HsConDetails name (LBangType name) -- The main payload
+
+ , con_res :: ResType name -- Result type of the constructor
+ }
+
+data ResType name
+ = ResTyH98 -- Constructor was declared using Haskell 98 syntax
+ | ResTyGADT (LHsType name) -- Constructor was declared using GADT-style syntax,
+ -- and here is its result type
\end{code}
\begin{code}
conDeclsNames cons
= snd (foldl do_one ([], []) cons)
where
- do_one (flds_seen, acc) (ConDecl lname _ _ (RecCon flds))
+ do_one (flds_seen, acc) (ConDecl { con_name = lname, con_details = RecCon flds })
= (map unLoc new_flds ++ flds_seen, lname : [f | f <- new_flds] ++ acc)
where
new_flds = [ f | (f,_) <- flds, not (unLoc f `elem` flds_seen) ]
- do_one (flds_seen, acc) (ConDecl lname _ _ _)
- = (flds_seen, lname:acc)
-
--- gaw 2004
- do_one (flds_seen, acc) (GadtDecl lname _)
- = (flds_seen, lname:acc)
+ do_one (flds_seen, acc) c
+ = (flds_seen, (con_name c):acc)
conDetailsTys details = map getBangType (hsConArgs details)
\end{code}
\begin{code}
instance (OutputableBndr name) => Outputable (ConDecl name) where
- ppr (ConDecl con tvs cxt con_details)
- = sep [pprHsForAll Explicit tvs cxt, ppr_con_details con con_details]
- ppr (GadtDecl con ty)
- = ppr con <+> dcolon <+> ppr ty
-
-ppr_con_details con (InfixCon ty1 ty2)
- = hsep [ppr ty1, pprHsVar con, ppr ty2]
-
--- ConDecls generated by MkIface.ifaceTyThing always have a PrefixCon, even
--- if the constructor is an infix one. This is because in an interface file
--- we don't distinguish between the two. Hence when printing these for the
--- user, we need to parenthesise infix constructor names.
-ppr_con_details con (PrefixCon tys)
- = hsep (pprHsVar con : map ppr tys)
-
-ppr_con_details con (RecCon fields)
- = ppr con <+> braces (sep (punctuate comma (map ppr_field fields)))
+ ppr = pprConDecl
+
+pprConDecl (ConDecl con expl tvs cxt details ResTyH98)
+ = sep [pprHsForAll expl tvs cxt, ppr_details con details]
+ where
+ ppr_details con (InfixCon t1 t2) = hsep [ppr t1, pprHsVar con, ppr t2]
+ ppr_details con (PrefixCon tys) = hsep (pprHsVar con : map ppr tys)
+ ppr_details con (RecCon fields) = ppr con <+> ppr_fields fields
+
+pprConDecl (ConDecl con expl tvs cxt details (ResTyGADT res_ty))
+ = sep [pprHsForAll expl tvs cxt, ppr con <+> ppr_details details]
where
- ppr_field (n, ty) = ppr n <+> dcolon <+> ppr ty
+ ppr_details (PrefixCon arg_tys) = dcolon <+> ppr (foldr mk_fun_ty res_ty arg_tys)
+ ppr_details (RecCon fields) = ppr fields <+> dcolon <+> ppr res_ty
+ ppr_details (PrefixCon _) = pprPanic "pprConDecl" (ppr con)
+
+ mk_fun_ty a b = noLoc (HsFunTy a b)
+ppr_fields fields = braces (sep (punctuate comma (map ppr_field fields)))
+ppr_field (n, ty) = ppr n <+> dcolon <+> ppr ty
\end{code}
%************************************************************************
-- foreign declarations are distinguished as to whether they define or use a
-- Haskell name
--
--- * the Boolean value indicates whether the pre-standard deprecated syntax
+-- * the Boolean value indicates whether the pre-standard deprecated syntax
-- has been used
--
type LForeignDecl name = Located (ForeignDecl name)
--
data ForeignImport = -- import of a C entity
--
- -- * the two strings specifying a header file or library
+ -- * the two strings specifying a header file or library
-- may be empty, which indicates the absence of a
-- header or object specification (both are not used
-- in the case of `CWrapper' and when `CFunction'
-- has a dynamic target)
--
- -- * the calling convention is irrelevant for code
+ -- * the calling convention is irrelevant for code
-- generation in the case of `CLabel', but is needed
-- for pretty printing
--
- -- * `Safety' is irrelevant for `CLabel' and `CWrapper'
+ -- * `Safety' is irrelevant for `CLabel' and `CWrapper'
--
CImport CCallConv -- ccall or stdcall
Safety -- safe or unsafe
ptext SLIT("dynamic")
pprCEntity _ _ (CWrapper) = ptext SLIT("wrapper")
--
- pprLib lib | nullFastString lib = empty
- | otherwise = char '[' <> ppr lib <> char ']'
+ pprLib lib | nullFS lib = empty
+ | otherwise = char '[' <> ppr lib <> char ']'
instance Outputable ForeignExport where
ppr (CExport (CExportStatic lbl cconv)) =
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