GRHSs, pprPatBind )
-- friends:
-import HsImpExp ( pprHsVar )
import HsPat ( Pat )
import HsTypes ( HsType )
-import CoreSyn ( CoreExpr )
-import PprCore ( {- instance Outputable (Expr a) -} )
--others:
import Name ( Name )
-import PrelNames ( isUnboundName )
import NameSet ( NameSet, elemNameSet, nameSetToList )
-import BasicTypes ( RecFlag(..), FixitySig(..), Activation(..) )
+import BasicTypes ( RecFlag(..), Activation(..), Fixity, IPName )
import Outputable
import SrcLoc ( SrcLoc )
import Var ( TyVar )
-import Class ( DefMeth (..) )
\end{code}
%************************************************************************
\begin{code}
data HsBinds id -- binders and bindees
= EmptyBinds
+ | ThenBinds (HsBinds id) (HsBinds id)
- | ThenBinds (HsBinds id)
- (HsBinds id)
+ | MonoBind -- A mutually recursive group
+ (MonoBinds id)
+ [Sig id] -- Empty on typechecker output, Type Signatures
+ RecFlag
- | MonoBind (MonoBinds id)
- [Sig id] -- Empty on typechecker output, Type Signatures
- RecFlag
+ | IPBinds -- Implcit parameters
+ -- Not allowed at top level
+ [(IPName id, HsExpr id)]
\end{code}
\begin{code}
nullBinds EmptyBinds = True
nullBinds (ThenBinds b1 b2) = nullBinds b1 && nullBinds b2
nullBinds (MonoBind b _ _) = nullMonoBinds b
+nullBinds (IPBinds b) = null b
-mkMonoBind :: MonoBinds id -> [Sig id] -> RecFlag -> HsBinds id
-mkMonoBind EmptyMonoBinds _ _ = EmptyBinds
-mkMonoBind mbinds sigs is_rec = MonoBind mbinds sigs is_rec
+mkMonoBind :: RecFlag -> MonoBinds id -> HsBinds id
+mkMonoBind _ EmptyMonoBinds = EmptyBinds
+mkMonoBind is_rec mbinds = MonoBind mbinds [] is_rec
\end{code}
\begin{code}
ppr_binds EmptyBinds = empty
ppr_binds (ThenBinds binds1 binds2)
= ppr_binds binds1 $$ ppr_binds binds2
+
+ppr_binds (IPBinds binds)
+ = sep (punctuate semi (map pp_item binds))
+ where
+ pp_item (id,rhs) = pprBndr LetBind id <+> equals <+> pprExpr rhs
+
ppr_binds (MonoBind bind sigs is_rec)
= vcat [ppr_isrec,
vcat (map ppr sigs),
| VarMonoBind id -- TRANSLATION
(HsExpr id)
- | CoreMonoBind id -- TRANSLATION
- CoreExpr -- No zonking; this is a final CoreExpr with Ids and Types!
-
| AbsBinds -- Binds abstraction; TRANSLATION
[TyVar] -- Type variables
[id] -- Dicts
ppr_monobind (VarMonoBind name expr)
= sep [pprBndr LetBind name <+> equals, nest 4 (pprExpr expr)]
-ppr_monobind (CoreMonoBind name expr)
- = sep [pprBndr LetBind name <+> equals, nest 4 (ppr expr)]
-
ppr_monobind (AbsBinds tyvars dictvars exports inlines val_binds)
= sep [ptext SLIT("AbsBinds"),
brackets (interpp'SP tyvars),
(HsType name)
SrcLoc
- | ClassOpSig name -- Selector name
- (DefMeth name) -- Default-method info
- -- See "THE NAMING STORY" in HsDecls
- (HsType name)
- SrcLoc
-
| SpecSig name -- specialise a function or datatype ...
(HsType name) -- ... to these types
SrcLoc
SrcLoc
| FixSig (FixitySig name) -- Fixity declaration
+
+data FixitySig name = FixitySig name Fixity SrcLoc
\end{code}
\begin{code}
okBindSig :: NameSet -> Sig Name -> Bool
-okBindSig ns (ClassOpSig _ _ _ _) = False
okBindSig ns sig = sigForThisGroup ns sig
-okClsDclSig :: NameSet -> Sig Name -> Bool
-okClsDclSig ns (Sig _ _ _) = False
-okClsDclSig ns sig = sigForThisGroup ns sig
+okClsDclSig :: Sig Name -> Bool
+okClsDclSig (SpecInstSig _ _) = False
+okClsDclSig sig = True -- All others OK
okInstDclSig :: NameSet -> Sig Name -> Bool
okInstDclSig ns (Sig _ _ _) = False
okInstDclSig ns (SpecInstSig _ _) = True
okInstDclSig ns sig = sigForThisGroup ns sig
+sigForThisGroup :: NameSet -> Sig Name -> Bool
sigForThisGroup ns sig
= case sigName sig of
- Nothing -> False
- Just n | isUnboundName n -> True -- Don't complain about an unbound name again
- | otherwise -> n `elemNameSet` ns
+ Nothing -> False
+ Just n -> n `elemNameSet` ns
sigName :: Sig name -> Maybe name
sigName (Sig n _ _) = Just n
-sigName (ClassOpSig n _ _ _) = Just n
sigName (SpecSig n _ _) = Just n
sigName (InlineSig _ n _ _) = Just n
sigName (FixSig (FixitySig n _ _)) = Just n
sigName other = Nothing
+sigLoc :: Sig name -> SrcLoc
+sigLoc (Sig _ _ loc) = loc
+sigLoc (SpecSig _ _ loc) = loc
+sigLoc (InlineSig _ _ _ loc) = loc
+sigLoc (FixSig (FixitySig n _ loc)) = loc
+sigLoc (SpecInstSig _ loc) = loc
+
isFixitySig :: Sig name -> Bool
isFixitySig (FixSig _) = True
isFixitySig _ = False
-isClassOpSig :: Sig name -> Bool
-isClassOpSig (ClassOpSig _ _ _ _) = True
-isClassOpSig _ = False
-
isPragSig :: Sig name -> Bool
-- Identifies pragmas
isPragSig (SpecSig _ _ _) = True
isPragSig (InlineSig _ _ _ _) = True
isPragSig (SpecInstSig _ _) = True
isPragSig other = False
-\end{code}
-\begin{code}
hsSigDoc (Sig _ _ loc) = (ptext SLIT("type signature"),loc)
-hsSigDoc (ClassOpSig _ _ _ loc) = (ptext SLIT("class-method type signature"), loc)
hsSigDoc (SpecSig _ _ loc) = (ptext SLIT("SPECIALISE pragma"),loc)
hsSigDoc (InlineSig True _ _ loc) = (ptext SLIT("INLINE pragma"),loc)
hsSigDoc (InlineSig False _ _ loc) = (ptext SLIT("NOINLINE pragma"),loc)
hsSigDoc (FixSig (FixitySig _ _ loc)) = (ptext SLIT("fixity declaration"), loc)
\end{code}
+Signature equality is used when checking for duplicate signatures
+
+\begin{code}
+eqHsSig :: Sig Name -> Sig Name -> Bool
+eqHsSig (FixSig (FixitySig n1 _ _)) (FixSig (FixitySig n2 _ _)) = n1 == n2
+eqHsSig (Sig n1 _ _) (Sig n2 _ _) = n1 == n2
+eqHsSig (InlineSig b1 n1 _ _) (InlineSig b2 n2 _ _) = b1 == b2 && n1 == n2
+ -- For specialisations, we don't have equality over
+ -- HsType, so it's not convenient to spot duplicate
+ -- specialisations here. Check for this later, when we're in Type land
+eqHsSig _other1 _other2 = False
+\end{code}
+
\begin{code}
instance (Outputable name) => Outputable (Sig name) where
ppr sig = ppr_sig sig
ppr_sig (Sig var ty _)
= sep [ppr var <+> dcolon, nest 4 (ppr ty)]
-ppr_sig (ClassOpSig var dm ty _)
- = sep [ pprHsVar var <+> dcolon,
- nest 4 (ppr ty),
- nest 4 (pp_dm_comment) ]
- where
- pp_dm = case dm of
- DefMeth _ -> equals -- Default method indicator
- GenDefMeth -> semi -- Generic method indicator
- NoDefMeth -> empty -- No Method at all
- pp_dm_comment = case dm of
- DefMeth _ -> text "{- has default method -}"
- GenDefMeth -> text "{- has generic method -}"
- NoDefMeth -> empty -- No Method at all
-
ppr_sig (SpecSig var ty _)
= sep [ hsep [text "{-# SPECIALIZE", ppr var, dcolon],
nest 4 (ppr ty <+> text "#-}")
= hsep [text "{-# SPECIALIZE instance", ppr ty, text "#-}"]
ppr_sig (FixSig fix_sig) = ppr fix_sig
-\end{code}
-Checking for distinct signatures; oh, so boring
-
-
-\begin{code}
-eqHsSig :: Sig Name -> Sig Name -> Bool
-eqHsSig (Sig n1 _ _) (Sig n2 _ _) = n1 == n2
-eqHsSig (InlineSig b1 n1 _ _)(InlineSig b2 n2 _ _) = b1 == b2 && n1 == n2
-
-eqHsSig (SpecInstSig ty1 _) (SpecInstSig ty2 _) = ty1 == ty2
-eqHsSig (SpecSig n1 ty1 _) (SpecSig n2 ty2 _) =
- -- may have many specialisations for one value;
- -- but not ones that are exactly the same...
- (n1 == n2) && (ty1 == ty2)
-
-eqHsSig _other1 _other2 = False
+instance Outputable name => Outputable (FixitySig name) where
+ ppr (FixitySig name fixity loc) = sep [ppr fixity, ppr name]
\end{code}
projects / ghc-hetmet.git / blobdiff