-- friends:
-- (PprType can see all the representations it's trying to print)
-import TypeRep ( Type(..), TyNote(..), Kind, UsageAnn(..),
- boxedTypeKind,
- ) -- friend
+import TypeRep ( Type(..), TyNote(..), Kind, boxedTypeKind ) -- friend
import Type ( PredType(..), ThetaType,
splitPredTy_maybe,
splitForAllTys, splitSigmaTy, splitRhoTy,
isDictTy, splitTyConApp_maybe, splitFunTy_maybe,
- splitUsForAllTys
+ predRepTy, isUTyVar
)
-import Var ( TyVar, tyVarKind,
- tyVarName, setTyVarName
- )
-import VarEnv
+import Var ( TyVar, tyVarKind )
import TyCon ( TyCon, isPrimTyCon, isTupleTyCon, isUnboxedTupleTyCon,
maybeTyConSingleCon, isEnumerationTyCon,
- tyConArity, tyConUnique
+ tyConArity, tyConName
)
-import Class ( Class, className )
+import Class ( Class )
-- others:
+import CmdLineOpts ( opt_PprStyle_RawTypes )
import Maybes ( maybeToBool )
-import Name ( getOccString, NamedThing(..) )
+import Name ( getOccString, getOccName )
import Outputable
import PprEnv
import Unique ( Uniquable(..) )
-import Unique -- quite a few *Keys
-import Util
+import PrelNames -- quite a few *Keys
\end{code}
%************************************************************************
pprPred :: PredType -> SDoc
pprPred (Class clas tys) = pprConstraint clas tys
-pprPred (IParam n ty) = ppr n <+> ppr ty
+pprPred (IParam n ty) = hsep [ptext SLIT("?") <> ppr n,
+ ptext SLIT("::"), ppr ty]
pprConstraint :: Class -> [Type] -> SDoc
-pprConstraint clas tys = ppr clas <+> hsep (map (pprParendType) tys)
+pprConstraint clas tys = ppr clas <+> hsep (map pprParendType tys)
pprTheta :: ThetaType -> SDoc
pprTheta theta = parens (hsep (punctuate comma (map pprPred theta)))
instance Outputable Type where
ppr ty = pprType ty
+
+instance Outputable PredType where
+ ppr = pprPred
\end{code}
\begin{code}
-tOP_PREC = (0 :: Int)
-fUN_PREC = (1 :: Int)
-tYCON_PREC = (2 :: Int)
+tOP_PREC = (0 :: Int) -- type in ParseIface.y
+fUN_PREC = (1 :: Int) -- btype in ParseIface.y
+tYCON_PREC = (2 :: Int) -- atype in ParseIface.y
maybeParen ctxt_prec inner_prec pretty
| ctxt_prec < inner_prec = pretty
ppr_ty env ctxt_prec ty@(TyConApp tycon tys)
-- KIND CASE; it's of the form (Type x)
- | tycon_uniq == typeConKey && n_tys == 1
+ | tycon `hasKey` typeConKey && n_tys == 1
= -- For kinds, print (Type x) as just x if x is a
-- type constructor (must be Boxed, Unboxed, AnyBox)
-- Otherwise print as (Type x)
case ty1 of
- TyConApp bx [] -> ppr bx
+ TyConApp bx [] -> ppr (getOccName bx) -- Always unqualified
other -> maybeParen ctxt_prec tYCON_PREC
(sep [ppr tycon, nest 4 tys_w_spaces])
-
+
+ -- USAGE CASE
+ | (tycon `hasKey` usOnceTyConKey || tycon `hasKey` usManyTyConKey) && n_tys == 0
+ = -- For usages (! and .), always print bare OccName, without pkg/mod/uniq
+ ppr (getOccName (tyConName tycon))
-- TUPLE CASE (boxed and unboxed)
| isTupleTyCon tycon
= parens (char '#' <+> tys_w_commas <+> char '#')
-- LIST CASE
- | tycon_uniq == listTyConKey && n_tys == 1
+ | tycon `hasKey` listTyConKey && n_tys == 1
= brackets (ppr_ty env tOP_PREC ty1)
-- DICTIONARY CASE, prints {C a}
= maybeParen ctxt_prec tYCON_PREC (sep [ppr tycon, nest 4 tys_w_spaces])
where
- tycon_uniq = tyConUnique tycon
n_tys = length tys
(ty1:_) = tys
Just pred = maybe_pred
ppr_ty env ctxt_prec ty@(ForAllTy _ _)
= getPprStyle $ \ sty ->
maybeParen ctxt_prec fUN_PREC $
- if ifaceStyle sty then
- sep [ ptext SLIT("__forall") <+> brackets pp_tyvars <+> ptext SLIT("=>"),
- ppr_ty env tOP_PREC rho
- ]
- else
- -- The type checker occasionally prints a type in an error message,
- -- and it had better come out looking like a user type
- sep [ ptext SLIT("forall") <+> pp_tyvars <> ptext SLIT("."),
- ppr_theta theta,
- ppr_ty env tOP_PREC tau
- ]
- where
- (tyvars, rho) = splitForAllTys ty -- don't treat theta specially any more (KSW 1999-04)
+ sep [ ptext SLIT("forall") <+> pp_tyvars sty <> ptext SLIT("."),
+ ppr_theta theta,
+ ppr_ty env tOP_PREC tau
+ ]
+ where
+ (tyvars, rho) = splitForAllTys ty
(theta, tau) = splitRhoTy rho
- pp_tyvars = hsep (map (pBndr env LambdaBind) tyvars)
+ pp_tyvars sty = hsep (map (pBndr env LambdaBind) some_tyvars)
+ where
+ some_tyvars | userStyle sty && not opt_PprStyle_RawTypes
+ = filter (not . isUTyVar) tyvars -- hide uvars from user
+ | otherwise
+ = tyvars
ppr_theta [] = empty
- ppr_theta theta = parens (hsep (punctuate comma (map ppr_pred theta)))
+ ppr_theta theta = parens (hsep (punctuate comma (map (ppr_pred env) theta)))
<+> ptext SLIT("=>")
- ppr_pred (Class clas tys) = ppr clas <+> hsep (map (ppr_ty env tYCON_PREC) tys)
- ppr_pred (IParam n ty) = hsep [char '?' <> ppr n, text "::",
- ppr_ty env tYCON_PREC ty]
ppr_ty env ctxt_prec (FunTy ty1 ty2)
- = maybeParen ctxt_prec fUN_PREC (sep (ppr_ty env fUN_PREC ty1 : pp_rest ty2))
-- we don't want to lose usage annotations or synonyms,
-- so we mustn't use splitFunTys here.
- where
- pp_rest (FunTy ty1 ty2) = pp_codom ty1 : pp_rest ty2
- pp_rest ty = [pp_codom ty]
- pp_codom ty = ptext SLIT("->") <+> ppr_ty env fUN_PREC ty
+ = maybeParen ctxt_prec fUN_PREC $
+ sep [ ppr_ty env fUN_PREC ty1
+ , ptext SLIT("->") <+> ppr_ty env tOP_PREC ty2
+ ]
ppr_ty env ctxt_prec (AppTy ty1 ty2)
= maybeParen ctxt_prec tYCON_PREC $
- ppr_ty env tOP_PREC ty1 <+> ppr_ty env tYCON_PREC ty2
+ ppr_ty env fUN_PREC ty1 <+> ppr_ty env tYCON_PREC ty2
+
+ppr_ty env ctxt_prec (UsageTy u ty)
+ = maybeParen ctxt_prec tYCON_PREC $
+ ptext SLIT("__u") <+> ppr_ty env tYCON_PREC u
+ <+> ppr_ty env tYCON_PREC ty
+ -- fUN_PREC would be logical for u, but it yields a reduce/reduce conflict with AppTy
ppr_ty env ctxt_prec (NoteTy (SynNote ty) expansion)
= ppr_ty env ctxt_prec ty
ppr_ty env ctxt_prec (NoteTy (FTVNote _) ty) = ppr_ty env ctxt_prec ty
-ppr_ty env ctxt_prec ty@(NoteTy (UsgForAll _) _)
- = maybeParen ctxt_prec fUN_PREC $
- sep [ ptext SLIT("__fuall") <+> brackets pp_uvars <+> ptext SLIT("=>"),
- ppr_ty env tOP_PREC sigma
- ]
- where
- (uvars,sigma) = splitUsForAllTys ty
- pp_uvars = hsep (map ppr uvars)
-
-ppr_ty env ctxt_prec (NoteTy (UsgNote u) ty)
- = maybeParen ctxt_prec tYCON_PREC $
- ptext SLIT("__u") <+> ppr u <+> ppr_ty env tYCON_PREC ty
-
-ppr_ty env ctxt_prec (NoteTy (IPNote nm) ty)
- = braces (ppr_pred env (IParam nm ty))
-
-ppr_theta env [] = empty
-ppr_theta env theta = braces (hsep (punctuate comma (map (ppr_pred env) theta)))
+ppr_ty env ctxt_prec (PredTy p) = braces (ppr_pred env p)
ppr_pred env (Class clas tys) = ppr clas <+>
hsep (map (ppr_ty env tYCON_PREC) tys)
ppr_pred env (IParam n ty) = hsep [char '?' <> ppr n, text "::",
ppr_ty env tYCON_PREC ty]
-
-{-
-ppr_dict env ctxt (clas, tys) = ppr clas <+>
- hsep (map (ppr_ty env tYCON_PREC) tys)
--}
\end{code}
\begin{code}
-pprTyEnv = initPprEnv b b (Just ppr) b (Just (\site -> pprTyVarBndr)) b
+pprTyEnv = initPprEnv b (Just ppr) b (Just (\site -> pprTyVarBndr)) b
where
b = panic "PprType:init_ppr_env"
\end{code}
-\begin{code}
-instance Outputable UsageAnn where
- ppr UsOnce = ptext SLIT("-")
- ppr UsMany = ptext SLIT("!")
- ppr (UsVar uv) = ppr uv
-\end{code}
-
%************************************************************************
%* *
\begin{code}
pprTyVarBndr tyvar
= getPprStyle $ \ sty ->
- if (ifaceStyle sty || debugStyle sty) && kind /= boxedTypeKind then
+ if (ifaceStyle sty && kind /= boxedTypeKind) || debugStyle sty then
hsep [ppr tyvar, dcolon, pprParendKind kind]
-- See comments with ppDcolon in PprCore.lhs
else
TyConApp tycon _ -> getOccString tycon
NoteTy (FTVNote _) ty -> getTyDescription ty
NoteTy (SynNote ty1) _ -> getTyDescription ty1
- NoteTy (UsgNote _) ty -> getTyDescription ty
+ PredTy p -> getTyDescription (predRepTy p)
ForAllTy _ ty -> getTyDescription ty
}
where
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