module PprType(
pprKind, pprParendKind,
pprType, pprParendType,
- pprConstraint, pprTheta,
+ pprSourceType, pprPred, pprTheta, pprClassPred,
pprTyVarBndr, pprTyVarBndrs,
- getTyDescription,
-
- nmbrType, nmbrGlobalType
+ -- Junk
+ getTyDescription, showTypeCategory
) where
#include "HsVersions.h"
-- friends:
-- (PprType can see all the representations it's trying to print)
-import Type ( GenType(..), TyNote(..), Kind, Type, ThetaType,
- splitFunTys, splitDictTy_maybe,
- splitForAllTys, splitSigmaTy, splitRhoTy,
- boxedTypeKind
- )
-import Var ( GenTyVar, TyVar, tyVarKind,
- tyVarName, setTyVarName
- )
-import VarEnv
-import TyCon ( TyCon, isTupleTyCon, isUnboxedTupleTyCon, tyConArity )
+import TypeRep ( Type(..), TyNote(..), Kind ) -- friend
+import Type ( SourceType(..) )
+import TcType ( ThetaType, PredType, TyThing(..),
+ tcSplitSigmaTy, isPredTy, isDictTy,
+ tcSplitTyConApp_maybe, tcSplitFunTy_maybe
+ )
+import Var ( TyVar, tyVarKind )
import Class ( Class )
+import TyCon ( TyCon, isPrimTyCon, isTupleTyCon, tupleTyConBoxity,
+ maybeTyConSingleCon, isEnumerationTyCon,
+ tyConArity, tyConName
+ )
-- others:
import Maybes ( maybeToBool )
-import Name ( getOccString, setNameVisibility, NamedThing(..) )
+import Name ( getOccString, getOccName )
+import OccName ( occNameUserString )
import Outputable
-import PprEnv
-import Unique ( Unique, Uniquable(..),
- incrUnique, listTyConKey, initTyVarUnique
- )
-import Util
+import Unique ( Uniquable(..) )
+import Util ( lengthIs )
+import BasicTypes ( IPName(..), tupleParens, ipNameName )
+import PrelNames -- quite a few *Keys
\end{code}
%************************************************************************
works just by setting the initial context precedence very high.
\begin{code}
-pprType, pprParendType :: GenType flexi -> SDoc
-pprType ty = ppr_ty pprTyEnv tOP_PREC ty
-pprParendType ty = ppr_ty pprTyEnv tYCON_PREC ty
+pprType, pprParendType :: Type -> SDoc
+pprType ty = ppr_ty tOP_PREC ty
+pprParendType ty = ppr_ty tYCON_PREC ty
pprKind, pprParendKind :: Kind -> SDoc
pprKind = pprType
pprParendKind = pprParendType
-pprConstraint :: Class -> [GenType flexi] -> SDoc
-pprConstraint clas tys = ppr clas <+> hsep (map (pprParendType) tys)
+pprPred :: PredType -> SDoc
+pprPred = pprSourceType
+
+pprSourceType :: SourceType -> SDoc
+pprSourceType (ClassP clas tys) = pprClassPred clas tys
+pprSourceType (IParam n ty) = hsep [ppr n, dcolon, ppr ty]
+pprSourceType (NType tc tys) = ppr tc <+> sep (map pprParendType tys)
+
+pprClassPred :: Class -> [Type] -> SDoc
+pprClassPred clas tys = ppr clas <+> sep (map pprParendType tys)
pprTheta :: ThetaType -> SDoc
-pprTheta theta = parens (hsep (punctuate comma (map ppr_dict theta)))
- where
- ppr_dict (c,tys) = pprConstraint c tys
+pprTheta theta = parens (sep (punctuate comma (map pprPred theta)))
-instance Outputable (GenType flexi) where
+instance Outputable Type where
ppr ty = pprType ty
+
+instance Outputable SourceType where
+ ppr = pprPred
+
+instance Outputable name => Outputable (IPName name) where
+ ppr (Dupable n) = char '?' <> ppr n -- Ordinary implicit parameters
+ ppr (Linear n) = char '%' <> ppr n -- Splittable implicit parameters
+
+instance Outputable name => OutputableBndr (IPName name) where
+ pprBndr _ n = ppr n -- Simple for now
+
+instance Outputable TyThing where
+ ppr (AnId id) = ptext SLIT("AnId") <+> ppr id
+ ppr (ATyCon tc) = ptext SLIT("ATyCon") <+> ppr tc
+ ppr (AClass cl) = ptext SLIT("AClass") <+> ppr cl
+ ppr (ADataCon dc) = ptext SLIT("ADataCon") <+> ppr dc
\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
\end{code}
\begin{code}
-ppr_ty :: PprEnv (GenTyVar flexi) flexi -> Int
- -> GenType flexi
- -> SDoc
-
-ppr_ty env ctxt_prec (TyVarTy tyvar)
- = pTyVarO env tyvar
+ppr_ty :: Int -> Type -> SDoc
+ppr_ty ctxt_prec (TyVarTy tyvar)
+ = ppr tyvar
+
+ppr_ty ctxt_prec ty@(TyConApp tycon tys)
+ -- KIND CASE; it's of the form (Type x)
+ | tycon `hasKey` typeConKey,
+ [ty] <- tys
+ = -- 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 ty of
+ TyConApp bx [] -> ppr (getOccName bx) -- Always unqualified
+ other -> maybeParen ctxt_prec tYCON_PREC
+ (ppr tycon <+> ppr_ty tYCON_PREC ty)
-- TUPLE CASE (boxed and unboxed)
-ppr_ty env ctxt_prec (TyConApp tycon tys)
- | isTupleTyCon tycon
- && length tys == tyConArity tycon -- no magic if partially applied
- = parens tys_w_commas
-
- | isUnboxedTupleTyCon tycon
- && length tys == tyConArity tycon -- no magic if partially applied
- = parens (char '#' <+> tys_w_commas <+> char '#')
- where
- tys_w_commas = sep (punctuate comma (map (ppr_ty env tOP_PREC) tys))
+ | isTupleTyCon tycon,
+ tys `lengthIs` tyConArity tycon -- No magic if partially applied
+ = tupleParens (tupleTyConBoxity tycon)
+ (sep (punctuate comma (map (ppr_ty tOP_PREC) tys)))
-- LIST CASE
-ppr_ty env ctxt_prec (TyConApp tycon [ty])
- | getUnique tycon == listTyConKey
- = brackets (ppr_ty env tOP_PREC ty)
-
- -- DICTIONARY CASE, prints {C a}
- -- This means that instance decls come out looking right in interfaces
- -- and that in turn means they get "gated" correctly when being slurped in
-ppr_ty env ctxt_prec ty@(TyConApp tycon tys)
- | maybeToBool maybe_dict
- = braces (ppr_dict env tYCON_PREC ctys)
- where
- Just ctys = maybe_dict
- maybe_dict = splitDictTy_maybe ty
-
- -- NO-ARGUMENT CASE (=> no parens)
-ppr_ty env ctxt_prec (TyConApp tycon [])
- = ppr tycon
+ | tycon `hasKey` listTyConKey,
+ [ty] <- tys
+ = brackets (ppr_ty tOP_PREC ty)
+
+ -- PARALLEL ARRAY CASE
+ | tycon `hasKey` parrTyConKey,
+ [ty] <- tys
+ = pabrackets (ppr_ty tOP_PREC ty)
-- GENERAL CASE
-ppr_ty env ctxt_prec (TyConApp tycon tys)
- = maybeParen ctxt_prec tYCON_PREC (hsep [ppr tycon, tys_w_spaces])
+ | otherwise
+ = ppr_tc_app ctxt_prec tycon tys
+
where
- tys_w_spaces = hsep (map (ppr_ty env tYCON_PREC) tys)
+ pabrackets p = ptext SLIT("[:") <> p <> ptext SLIT(":]")
-ppr_ty env ctxt_prec ty@(ForAllTy _ _)
+ppr_ty ctxt_prec ty@(ForAllTy _ _)
= getPprStyle $ \ sty ->
maybeParen ctxt_prec fUN_PREC $
- if userStyle sty then
- sep [ ptext SLIT("forall"), pp_tyvars, ptext SLIT("."), pp_maybe_ctxt, pp_body ]
- else
- sep [ ptext SLIT("__forall"), brackets pp_tyvars, pp_ctxt, pp_body ]
- where
- (tyvars, rho_ty) = splitForAllTys ty
- (theta, body_ty) = splitRhoTy rho_ty
-
- pp_tyvars = hsep (map (pBndr env LambdaBind) tyvars)
- pp_body = ppr_ty env tOP_PREC body_ty
+ sep [ ptext SLIT("forall") <+> pp_tyvars sty <> ptext SLIT("."),
+ ppr_theta theta,
+ ppr_ty tOP_PREC tau
+ ]
+ where
+ (tyvars, theta, tau) = tcSplitSigmaTy ty
+ pp_tyvars sty = sep (map pprTyVarBndr tyvars)
- pp_maybe_ctxt | null theta = empty
- | otherwise = pp_ctxt
+ ppr_theta [] = empty
+ ppr_theta theta = pprTheta theta <+> ptext SLIT("=>")
- pp_ctxt = ppr_theta env theta <+> ptext SLIT("=>")
+ppr_ty ctxt_prec (FunTy ty1 ty2)
+ -- we don't want to lose usage annotations or synonyms,
+ -- so we mustn't use splitFunTys here.
+ = maybeParen ctxt_prec fUN_PREC $
+ sep [ ppr_ty fUN_PREC ty1
+ , ptext arrow <+> ppr_ty tOP_PREC ty2
+ ]
+ where arrow | isPredTy ty1 = SLIT("=>")
+ | otherwise = SLIT("->")
-ppr_ty env ctxt_prec (FunTy ty1 ty2)
- -- We fiddle the precedences passed to left/right branches,
- -- so that right associativity comes out nicely...
- = maybeParen ctxt_prec fUN_PREC (sep (ppr_ty env fUN_PREC ty1 : pp_rest))
- where
- (arg_tys, result_ty) = splitFunTys ty2
- pp_rest = [ ptext SLIT("-> ") <> ppr_ty env fUN_PREC ty | ty <- arg_tys ++ [result_ty] ]
-
-ppr_ty env ctxt_prec (AppTy ty1 ty2)
+ppr_ty ctxt_prec (AppTy ty1 ty2)
= maybeParen ctxt_prec tYCON_PREC $
- ppr_ty env tOP_PREC ty1 <+> ppr_ty env tYCON_PREC ty2
+ ppr_ty fUN_PREC ty1 <+> ppr_ty tYCON_PREC ty2
-ppr_ty env ctxt_prec (NoteTy (SynNote ty) expansion)
- = ppr_ty env ctxt_prec ty
+ppr_ty ctxt_prec (NoteTy (SynNote ty) expansion)
+ = ppr_ty ctxt_prec ty
+-- = ppr_ty ctxt_prec expansion -- if we don't want to see syntys
-ppr_ty env ctxt_prec (NoteTy (FTVNote _) ty) = ppr_ty env ctxt_prec ty
+ppr_ty ctxt_prec (NoteTy (FTVNote _) ty) = ppr_ty ctxt_prec ty
-ppr_theta env [] = empty
-ppr_theta env theta = braces (hsep (punctuate comma (map (ppr_dict env tOP_PREC) theta)))
+ppr_ty ctxt_prec (SourceTy (NType tc tys)) = ppr_tc_app ctxt_prec tc tys
+ppr_ty ctxt_prec (SourceTy pred) = braces (pprPred pred)
-ppr_dict env ctxt (clas, tys) = ppr clas <+>
- hsep (map (ppr_ty env tYCON_PREC) tys)
+ppr_tc_app ctxt_prec tc [] = ppr tc
+ppr_tc_app ctxt_prec tc tys = maybeParen ctxt_prec tYCON_PREC
+ (sep [ppr tc, nest 4 (sep (map (ppr_ty tYCON_PREC) tys))])
\end{code}
-\begin{code}
-pprTyEnv = initPprEnv b b (Just ppr) b (Just (\site -> pprTyVarBndr)) b
- where
- b = panic "PprType:init_ppr_env"
-\end{code}
%************************************************************************
%* *
and when in debug mode.
\begin{code}
+pprTyVarBndr :: TyVar -> SDoc
pprTyVarBndr tyvar
= getPprStyle $ \ sty ->
- if (ifaceStyle sty || debugStyle sty) && kind /= boxedTypeKind then
- hcat [ppr tyvar, text " :: ", pprParendKind kind]
+ if debugStyle sty then
+ hsep [ppr tyvar, dcolon, pprParendKind kind]
-- See comments with ppDcolon in PprCore.lhs
else
ppr tyvar
getTyDescription :: Type -> String
getTyDescription ty
- = case (splitSigmaTy ty) of { (_, _, tau_ty) ->
+ = case (tcSplitSigmaTy ty) of { (_, _, tau_ty) ->
case tau_ty of
- TyVarTy _ -> "*"
- AppTy fun _ -> getTyDescription fun
- FunTy _ res -> '-' : '>' : fun_result res
- TyConApp tycon _ -> getOccString tycon
+ TyVarTy _ -> "*"
+ AppTy fun _ -> getTyDescription fun
+ FunTy _ res -> '-' : '>' : fun_result res
+ TyConApp tycon _ -> occNameUserString (getOccName tycon)
NoteTy (FTVNote _) ty -> getTyDescription ty
NoteTy (SynNote ty1) _ -> getTyDescription ty1
- ForAllTy _ ty -> getTyDescription ty
+ SourceTy sty -> getSourceTyDescription sty
+ ForAllTy _ ty -> getTyDescription ty
}
where
fun_result (FunTy _ res) = '>' : fun_result res
fun_result other = getTyDescription other
-\end{code}
-
-
-%************************************************************************
-%* *
-\subsection{Renumbering types}
-%* *
-%************************************************************************
-
-We tend to {\em renumber} everything before printing, so that we get
-consistent Uniques on everything from run to run.
-
-
-\begin{code}
-nmbrGlobalType :: Type -> Type -- Renumber a top-level type
-nmbrGlobalType ty = nmbrType emptyVarEnv initTyVarUnique ty
-
-nmbrType :: TyVarEnv Type -- Substitution
- -> Unique -- This unique and its successors are not
- -- free in the range of the substitution
- -> Type
- -> Type
-
-nmbrType tyvar_env uniq ty
- = initNmbr tyvar_env uniq (nmbrTy ty)
-
-nmbrTy :: Type -> NmbrM Type
-
-nmbrTy (TyVarTy tv)
- = lookupTyVar tv
-
-nmbrTy (AppTy t1 t2)
- = nmbrTy t1 `thenNmbr` \ new_t1 ->
- nmbrTy t2 `thenNmbr` \ new_t2 ->
- returnNmbr (AppTy new_t1 new_t2)
-
-nmbrTy (TyConApp tc tys)
- = mapNmbr nmbrTy tys `thenNmbr` \ new_tys ->
- returnNmbr (TyConApp tc new_tys)
-
-nmbrTy (NoteTy (SynNote ty1) ty2)
- = nmbrTy ty1 `thenNmbr` \ new_ty1 ->
- nmbrTy ty2 `thenNmbr` \ new_ty2 ->
- returnNmbr (NoteTy (SynNote new_ty1) new_ty2)
-nmbrTy (NoteTy (FTVNote _) ty2) = nmbrTy ty2
-
-nmbrTy (ForAllTy tv ty)
- = addTyVar tv $ \ new_tv ->
- nmbrTy ty `thenNmbr` \ new_ty ->
- returnNmbr (ForAllTy new_tv new_ty)
-
-nmbrTy (FunTy t1 t2)
- = nmbrTy t1 `thenNmbr` \ new_t1 ->
- nmbrTy t2 `thenNmbr` \ new_t2 ->
- returnNmbr (FunTy new_t1 new_t2)
-
-
-lookupTyVar tyvar env uniq
- = (uniq, ty)
- where
- ty = case lookupVarEnv env tyvar of
- Just ty -> ty
- Nothing -> TyVarTy tyvar
-
-addTyVar tv m env u
- = m tv' env' u'
- where
- env' = extendVarEnv env tv (TyVarTy tv')
- tv' = setTyVarName tv (setNameVisibility Nothing u (tyVarName tv))
- u' = incrUnique u
+getSourceTyDescription (ClassP cl tys) = getOccString cl
+getSourceTyDescription (NType tc tys) = getOccString tc
+getSourceTyDescription (IParam ip ty) = getOccString (ipNameName ip)
\end{code}
-Monad stuff
\begin{code}
-type NmbrM a = TyVarEnv Type -> Unique -> (Unique, a) -- Unique is name supply
-
-initNmbr :: TyVarEnv Type -> Unique -> NmbrM a -> a
-initNmbr env uniq m
- = snd (m env uniq)
-
-returnNmbr x nenv u = (u, x)
-
-thenNmbr m k nenv u
- = let
- (u', res) = m nenv u
- in
- k res nenv u'
-
-
-mapNmbr f [] = returnNmbr []
-mapNmbr f (x:xs)
- = f x `thenNmbr` \ r ->
- mapNmbr f xs `thenNmbr` \ rs ->
- returnNmbr (r:rs)
+showTypeCategory :: Type -> Char
+ {-
+ {C,I,F,D} char, int, float, double
+ T tuple
+ S other single-constructor type
+ {c,i,f,d} unboxed ditto
+ t *unpacked* tuple
+ s *unpacked" single-cons...
+
+ v void#
+ a primitive array
+
+ E enumeration type
+ + dictionary, unless it's a ...
+ L List
+ > function
+ M other (multi-constructor) data-con type
+ . other type
+ - reserved for others to mark as "uninteresting"
+ -}
+showTypeCategory ty
+ = if isDictTy ty
+ then '+'
+ else
+ case tcSplitTyConApp_maybe ty of
+ Nothing -> if maybeToBool (tcSplitFunTy_maybe ty)
+ then '>'
+ else '.'
+
+ Just (tycon, _) ->
+ let utc = getUnique tycon in
+ if utc == charDataConKey then 'C'
+ else if utc == intDataConKey then 'I'
+ else if utc == floatDataConKey then 'F'
+ else if utc == doubleDataConKey then 'D'
+ else if utc == smallIntegerDataConKey ||
+ utc == largeIntegerDataConKey then 'J'
+ else if utc == charPrimTyConKey then 'c'
+ else if (utc == intPrimTyConKey || utc == wordPrimTyConKey
+ || utc == addrPrimTyConKey) then 'i'
+ else if utc == floatPrimTyConKey then 'f'
+ else if utc == doublePrimTyConKey then 'd'
+ else if isPrimTyCon tycon {- array, we hope -} then 'A' -- Bogus
+ else if isEnumerationTyCon tycon then 'E'
+ else if isTupleTyCon tycon then 'T'
+ else if maybeToBool (maybeTyConSingleCon tycon) then 'S'
+ else if utc == listTyConKey then 'L'
+ else 'M' -- oh, well...
\end{code}