@InstDecl@, @DefaultDecl@ and @ForeignDecl@.
\begin{code}
+{-# OPTIONS -fno-warn-incomplete-patterns #-}
+-- 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(..),
-- 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
}
-- type class
isClassDecl (ClassDecl {}) = True
-isClassDecl other = False
+isClassDecl _ = False
-- type family declaration
isFamilyDecl (TyFamily {}) = True
tyClDeclNames (TyData {tcdLName = tc_name, tcdCons = cons})
= tc_name : conDeclsNames (map unLoc cons)
+tyClDeclTyVars :: TyClDecl name -> [LHsTyVarBndr name]
tyClDeclTyVars (TyFamily {tcdTyVars = tvs}) = tvs
tyClDeclTyVars (TySynonym {tcdTyVars = tvs}) = tvs
tyClDeclTyVars (TyData {tcdTyVars = tvs}) = tvs
= hsep [ pprHsContext context, ppr thing
, hsep (map (pprParendHsType.unLoc) typats)]
+pp_condecls :: OutputableBndr name => [LConDecl name] -> SDoc
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))
-pp_tydecl True pp_head pp_decl_rhs derivings
+pp_tydecl :: OutputableBndr name => Bool -> SDoc -> SDoc -> Maybe [LHsType name] -> SDoc
+pp_tydecl True pp_head _ _
= pp_head
pp_tydecl False pp_head pp_decl_rhs derivings
= hang pp_head 4 (sep [
\end{code}
\begin{code}
-conDeclsNames :: forall name. Eq name => [ConDecl name] -> [Located name]
+conDeclsNames :: (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
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]
+pprConDecl (ConDecl con _expl _tvs _cxt (InfixCon _ _) (ResTyGADT _res_ty) _)
+ = pprPanic "pprConDecl" (ppr con)
+ -- In GADT syntax we don't allow infix constructors
+
+
+ppr_fields :: OutputableBndr name => [ConDeclField name] -> SDoc
ppr_fields fields = braces (sep (punctuate comma (map ppr_fld fields)))
where
ppr_fld (ConDeclField { cd_fld_name = n, cd_fld_type = ty,
instance (OutputableBndr name) => Outputable (InstDecl name) where
ppr (InstDecl inst_ty binds uprags ats)
- = vcat [hsep [ptext SLIT("instance"), ppr inst_ty, ptext SLIT("where")],
- nest 4 (ppr ats),
- nest 4 (ppr uprags),
- nest 4 (pprLHsBinds binds) ]
+ = vcat [hsep [ptext SLIT("instance"), ppr inst_ty, ptext SLIT("where")]
+ , nest 4 $ vcat (map ppr ats)
+ , nest 4 $ vcat (map ppr uprags)
+ , nest 4 $ pprLHsBinds binds ]
-- Extract the declarations of associated types from an instance
--
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) =
pprCEntity header lib (CFunction (StaticTarget lbl)) =
ptext SLIT("static") <+> ftext header <+> char '&' <>
pprLib lib <> ppr lbl
- pprCEntity header lib (CFunction (DynamicTarget)) =
+ pprCEntity _ _ (CFunction (DynamicTarget)) =
ptext SLIT("dynamic")
pprCEntity _ _ (CWrapper) = ptext SLIT("wrapper")
--
collectRuleBndrSigTys bndrs = [ty | RuleBndrSig _ ty <- bndrs]
instance OutputableBndr name => Outputable (RuleDecl name) where
- ppr (HsRule name act ns lhs fv_lhs rhs fv_rhs)
+ ppr (HsRule name act ns lhs _fv_lhs rhs _fv_rhs)
= sep [text "{-# RULES" <+> doubleQuotes (ftext name) <+> ppr act,
nest 4 (pp_forall <+> pprExpr (unLoc lhs)),
nest 4 (equals <+> pprExpr (unLoc rhs) <+> text "#-}") ]
instance Outputable (DocDecl name) where
ppr _ = text "<document comment>"
+docDeclDoc :: DocDecl name -> HsDoc name
docDeclDoc (DocCommentNext d) = d
docDeclDoc (DocCommentPrev d) = d
docDeclDoc (DocCommentNamed _ d) = d