@InstDecl@, @DefaultDecl@ and @ForeignDecl@.
\begin{code}
+{-# OPTIONS -w #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and fix
+-- any warnings in the module. See
+-- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
+-- for details
+
module HsDecls (
HsDecl(..), LHsDecl, TyClDecl(..), LTyClDecl,
InstDecl(..), LInstDecl, DerivDecl(..), LDerivDecl, NewOrData(..),
DefaultDecl(..), LDefaultDecl, SpliceDecl(..),
ForeignDecl(..), LForeignDecl, ForeignImport(..), ForeignExport(..),
CImportSpec(..), FoType(..),
- ConDecl(..), ResType(..), LConDecl,
+ ConDecl(..), ResType(..), ConDeclField(..), LConDecl,
+ HsConDeclDetails, hsConDeclArgTys,
DocDecl(..), LDocDecl, docDeclDoc,
DeprecDecl(..), LDeprecDecl,
HsGroup(..), emptyRdrGroup, emptyRnGroup, appendGroups,
isClassDecl, isSynDecl, isDataDecl, isTypeDecl, isFamilyDecl,
isFamInstDecl,
countTyClDecls,
- conDetailsTys,
instDeclATs,
collectRuleBndrSigTys,
) where
-- instance' decl with explicit kind sig
tcdCons :: [LConDecl name], -- Data constructors
- -- 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
+ -- 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
tcdSigs :: [LSig name], -- Methods' signatures
tcdMeths :: LHsBinds name, -- Default methods
tcdATs :: [LTyClDecl name], -- Associated types; ie
- -- only 'TyData',
- -- 'TyFunction',
- -- and 'TySynonym'
+ -- only 'TyFamily' and
+ -- 'TySynonym'; the
+ -- latter for defaults
tcdDocs :: [LDocDecl name] -- Haddock docs
}
data FamilyFlavour
= TypeFamily -- "type family ..."
- | DataFamily NewOrData -- "newtype family ..." or "data family ..."
+ | DataFamily -- "data family ..."
\end{code}
Simple classifiers
= pp_flavour <+> pp_decl_head [] ltycon tyvars Nothing <+> pp_kind
where
pp_flavour = case flavour of
- TypeFamily -> ptext SLIT("type family")
- DataFamily NewType -> ptext SLIT("newtype family")
- DataFamily DataType -> ptext SLIT("data family")
+ TypeFamily -> ptext SLIT("type family")
+ DataFamily -> ptext SLIT("data family")
pp_kind = case mb_kind of
Nothing -> empty
, 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_details :: HsConDeclDetails name -- The main payload
, con_res :: ResType name -- Result type of the constructor
, con_doc :: Maybe (LHsDoc name) -- A possible Haddock comment
}
+type HsConDeclDetails name = HsConDetails (LBangType name) [ConDeclField name]
+
+hsConDeclArgTys :: HsConDeclDetails name -> [LBangType name]
+hsConDeclArgTys (PrefixCon tys) = tys
+hsConDeclArgTys (InfixCon ty1 ty2) = [ty1,ty2]
+hsConDeclArgTys (RecCon flds) = map cd_fld_type flds
+
+data ConDeclField name -- Record fields have Haddoc docs on them
+ = ConDeclField { cd_fld_name :: Located name,
+ cd_fld_type :: LBangType name,
+ cd_fld_doc :: Maybe (LHsDoc name) }
+
data ResType name
= ResTyH98 -- Constructor was declared using Haskell 98 syntax
| ResTyGADT (LHsType name) -- Constructor was declared using GADT-style syntax,
\end{code}
\begin{code}
-conDeclsNames :: Eq name => [ConDecl name] -> [Located name]
+conDeclsNames :: forall name. Eq name => [ConDecl name] -> [Located name]
-- See tyClDeclNames for what this does
-- The function is boringly complicated because of the records
-- And since we only have equality, we have to be a little careful
= snd (foldl do_one ([], []) cons)
where
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)
+ = (map unLoc new_flds ++ flds_seen, lname : new_flds ++ acc)
where
- new_flds = [ f | (HsRecField f _ _) <- flds, not (unLoc f `elem` flds_seen) ]
+ new_flds = filterOut (\f -> unLoc f `elem` flds_seen)
+ (map cd_fld_name flds)
do_one (flds_seen, acc) c
= (flds_seen, (con_name c):acc)
-
-conDetailsTys details = map getBangType (hsConArgs details)
\end{code}
instance (OutputableBndr name) => Outputable (ConDecl name) where
ppr = pprConDecl
+pprConDecl :: OutputableBndr name => ConDecl name -> SDoc
pprConDecl (ConDecl con expl tvs cxt details ResTyH98 doc)
= sep [ppr_mbDoc doc, pprHsForAll expl tvs cxt, ppr_details con details]
where
pprConDecl (ConDecl con expl tvs cxt (RecCon fields) (ResTyGADT res_ty) _)
= sep [pprHsForAll expl tvs cxt, ppr con <+> ppr_fields fields <+> dcolon <+> ppr res_ty]
-ppr_fields fields = braces (sep (punctuate comma (map ppr fields)))
+ppr_fields fields = braces (sep (punctuate comma (map ppr_fld fields)))
+ where
+ ppr_fld (ConDeclField { cd_fld_name = n, cd_fld_type = ty,
+ cd_fld_doc = doc })
+ = ppr n <+> dcolon <+> ppr ty <+> ppr_mbDoc doc
\end{code}
%************************************************************************
instance OutputableBndr name => Outputable (ForeignDecl name) where
ppr (ForeignImport n ty fimport) =
- ptext SLIT("foreign import") <+> ppr fimport <+>
- ppr n <+> dcolon <+> ppr ty
+ hang (ptext SLIT("foreign import") <+> ppr fimport <+> ppr n)
+ 2 (dcolon <+> ppr ty)
ppr (ForeignExport n ty fexport) =
- ptext SLIT("foreign export") <+> ppr fexport <+>
- ppr n <+> dcolon <+> ppr ty
+ hang (ptext SLIT("foreign export") <+> ppr fexport <+> ppr n)
+ 2 (dcolon <+> ppr ty)
instance Outputable ForeignImport where
ppr (DNImport spec) =
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