%
-% (c) The AQUA Project, Glasgow University, 1996
+% (c) The AQUA Project, Glasgow University, 1996-1998
%
\section[PprType]{Printing Types, TyVars, Classes, TyCons}
\begin{code}
module PprType(
- pprTyVar, pprTyVarBndr, pprTyVarBndrs,
- TyCon, pprTyCon, showTyCon,
+ pprKind, pprParendKind,
pprType, pprParendType,
- pprMaybeTy,
- getTyDescription,
pprConstraint, pprTheta,
+ pprTyVarBndr, pprTyVarBndrs,
- nmbrType, nmbrGlobalType
+ -- Junk
+ getTyDescription, showTypeCategory
) where
#include "HsVersions.h"
-- friends:
-- (PprType can see all the representations it's trying to print)
-import Type ( GenType(..), Type, ThetaType, splitFunTys, splitDictTy_maybe,
- splitForAllTys, splitSigmaTy, splitRhoTy, splitAppTys )
-import TyVar ( GenTyVar(..), TyVar, cloneTyVar )
-import TyCon ( TyCon, NewOrData, isFunTyCon, isTupleTyCon, tyConArity )
+import Type ( Type(..), TyNote(..), Kind, ThetaType,
+ splitFunTys, splitDictTy_maybe,
+ splitForAllTys, splitSigmaTy, splitRhoTy,
+ isDictTy, splitTyConApp_maybe, splitFunTy_maybe,
+ boxedTypeKind
+ )
+import Var ( TyVar, tyVarKind,
+ tyVarName, setTyVarName
+ )
+import VarEnv
+import TyCon ( TyCon, isPrimTyCon, isTupleTyCon, isUnboxedTupleTyCon,
+ maybeTyConSingleCon, isEnumerationTyCon,
+ tyConArity, tyConUnique
+ )
import Class ( Class )
-import Kind ( GenKind(..), isBoxedTypeKind, pprParendKind )
-- others:
-import CmdLineOpts ( opt_PprUserLength )
import Maybes ( maybeToBool )
-import Name ( nameString, pprOccName, getOccString, OccName, NamedThing(..) )
+import Name ( getOccString, NamedThing(..) )
import Outputable
import PprEnv
-import BasicTypes ( Unused )
-import UniqFM ( UniqFM, addToUFM, emptyUFM, lookupUFM )
-import Unique ( Unique, Uniquable(..), pprUnique,
- incrUnique, listTyConKey, initTyVarUnique
- )
+import Unique ( Uniquable(..) )
+import Unique -- quite a few *Keys
import Util
\end{code}
+%************************************************************************
+%* *
+\subsection{The external interface}
+%* *
+%************************************************************************
+
+@pprType@ is the standard @Type@ printer; the overloaded @ppr@ function is
+defined to use this. @pprParendType@ is the same, except it puts
+parens around the type, except for the atomic cases. @pprParendType@
+works just by setting the initial context precedence very high.
+
\begin{code}
-instance Outputable (GenType flexi) where
- ppr ty = pprType ty
+pprType, pprParendType :: Type -> SDoc
+pprType ty = ppr_ty pprTyEnv tOP_PREC ty
+pprParendType ty = ppr_ty pprTyEnv tYCON_PREC ty
-instance Outputable TyCon where
- ppr tycon = pprTyCon tycon
+pprKind, pprParendKind :: Kind -> SDoc
+pprKind = pprType
+pprParendKind = pprParendType
-instance Outputable Class where
- -- we use pprIfaceClass for printing in interfaces
- ppr clas = ppr (getName clas)
+pprConstraint :: Class -> [Type] -> SDoc
+pprConstraint clas tys = ppr clas <+> hsep (map (pprParendType) tys)
-instance Outputable (GenTyVar flexi) where
- ppr tv = pprTyVar tv
+pprTheta :: ThetaType -> SDoc
+pprTheta theta = parens (hsep (punctuate comma (map ppr_dict theta)))
+ where
+ ppr_dict (c,tys) = pprConstraint c tys
+
+instance Outputable Type where
+ ppr ty = pprType ty
\end{code}
+
%************************************************************************
%* *
-\subsection[Type]{@Type@}
+\subsection{Pretty printing}
%* *
%************************************************************************
| otherwise = parens pretty
\end{code}
-@pprType@ is the std @Type@ printer; the overloaded @ppr@ function is
-defined to use this. @pprParendType@ is the same, except it puts
-parens around the type, except for the atomic cases. @pprParendType@
-works just by setting the initial context precedence very high.
-
-\begin{code}
-pprType, pprParendType :: GenType flexi -> SDoc
-
-pprType ty = ppr_ty init_ppr_env tOP_PREC ty
-pprParendType ty = ppr_ty init_ppr_env tYCON_PREC ty
-
-pprConstraint :: Class -> [GenType flexi] -> SDoc
-pprConstraint clas tys = hsep [ppr clas, hsep (map (pprParendType) tys)]
-
-pprTheta :: ThetaType -> SDoc
-pprTheta theta = parens (hsep (punctuate comma (map ppr_dict theta)))
- where
- ppr_dict (c,tys) = pprConstraint c tys
-
-pprMaybeTy :: Maybe (GenType flexi) -> SDoc
-pprMaybeTy Nothing = char '*'
-pprMaybeTy (Just ty) = pprParendType ty
-\end{code}
-
\begin{code}
-ppr_ty :: PprEnv flexi bndr occ -> Int
- -> GenType flexi
- -> SDoc
-
+ppr_ty :: PprEnv TyVar -> Int -> Type -> SDoc
ppr_ty env ctxt_prec (TyVarTy tyvar)
= pTyVarO env tyvar
- -- TUPLE CASE
-ppr_ty env ctxt_prec (TyConApp tycon tys)
+ppr_ty env ctxt_prec ty@(TyConApp tycon tys)
+ -- KIND CASE; it's of the form (Type x)
+ | tycon_uniq == 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
+ other -> maybeParen ctxt_prec tYCON_PREC
+ (ppr tycon <+> tys_w_spaces)
+
+
+ -- TUPLE CASE (boxed and unboxed)
| isTupleTyCon tycon
- && length tys == tyConArity tycon -- no magic if partially applied
+ && length tys == tyConArity tycon -- no magic if partially applied
= parens tys_w_commas
- where
- tys_w_commas = hsep (punctuate comma (map (ppr_ty env tOP_PREC) tys))
+
+ | isUnboxedTupleTyCon tycon
+ && length tys == tyConArity tycon -- no magic if partially applied
+ = parens (char '#' <+> tys_w_commas <+> char '#')
-- LIST CASE
-ppr_ty env ctxt_prec (TyConApp tycon [ty])
- | uniqueOf tycon == listTyConKey
- = brackets (ppr_ty env tOP_PREC ty)
+ | tycon_uniq == listTyConKey && n_tys == 1
+ = brackets (ppr_ty env tOP_PREC ty1)
-- 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 env tycon
+ | null tys
+ = ppr tycon
-- GENERAL CASE
-ppr_ty env ctxt_prec (TyConApp tycon tys)
- = maybeParen ctxt_prec tYCON_PREC (hsep [ppr_tycon env tycon, tys_w_spaces])
+ | otherwise
+ = maybeParen ctxt_prec tYCON_PREC (hsep [ppr tycon, tys_w_spaces])
+
where
+ tycon_uniq = tyConUnique tycon
+ n_tys = length tys
+ (ty1:_) = tys
+ Just ctys = maybe_dict
+ maybe_dict = splitDictTy_maybe ty -- Checks class and arity
+ tys_w_commas = sep (punctuate comma (map (ppr_ty env tOP_PREC) tys))
tys_w_spaces = hsep (map (ppr_ty env tYCON_PREC) tys)
+
ppr_ty env ctxt_prec ty@(ForAllTy _ _)
= getPprStyle $ \ sty ->
- let
- (tyvars, rho_ty) = splitForAllTys ty
- (theta, body_ty) | show_context = splitRhoTy rho_ty
- | otherwise = ([], rho_ty)
+ maybeParen ctxt_prec fUN_PREC $
+ if ifaceStyle sty then
+ sep [ ptext SLIT("__forall"), brackets pp_tyvars, pp_ctxt, pp_body ]
+ else
+ sep [ ptext SLIT("forall"), pp_tyvars <> ptext SLIT("."), pp_maybe_ctxt, pp_body ]
+ where
+ (tyvars, rho_ty) = splitForAllTys ty
+ (theta, body_ty) = splitRhoTy rho_ty
- pp_tyvars = brackets (hsep (map (pTyVarB env) tyvars))
- pp_body = ppr_ty env tOP_PREC body_ty
+ pp_tyvars = hsep (map (pBndr env LambdaBind) tyvars)
+ pp_body = ppr_ty env tOP_PREC body_ty
- show_forall = not (userStyle sty)
- show_context = ifaceStyle sty || userStyle sty
- in
- if show_forall then
- maybeParen ctxt_prec fUN_PREC $
- sep [ ptext SLIT("_forall_"), pp_tyvars,
- ppr_theta env theta, ptext SLIT("=>"), pp_body
- ]
-
- else if null theta then
- ppr_ty env ctxt_prec body_ty
+ pp_maybe_ctxt | null theta = empty
+ | otherwise = pp_ctxt
+
+ pp_ctxt = ppr_theta env theta <+> ptext SLIT("=>")
- else
- maybeParen ctxt_prec fUN_PREC $
- sep [ppr_theta env theta, ptext SLIT("=>"), pp_body]
ppr_ty env ctxt_prec (FunTy ty1 ty2)
-- We fiddle the precedences passed to left/right branches,
= maybeParen ctxt_prec tYCON_PREC $
ppr_ty env tOP_PREC ty1 <+> ppr_ty env tYCON_PREC ty2
-ppr_ty env ctxt_prec (SynTy ty expansion)
+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_theta env [] = empty
ppr_theta env theta = braces (hsep (punctuate comma (map (ppr_dict env tOP_PREC) theta)))
-ppr_dict env ctxt (clas, tys) = ppr_class env clas <+>
+ppr_dict env ctxt (clas, tys) = ppr clas <+>
hsep (map (ppr_ty env tYCON_PREC) tys)
\end{code}
\begin{code}
-init_ppr_env
- = initPprEnv b b b b (Just pprTyVarBndr) (Just ppr) b b b
+pprTyEnv = initPprEnv b b (Just ppr) b (Just (\site -> pprTyVarBndr)) b
where
b = panic "PprType:init_ppr_env"
-
-ppr_tycon env tycon = ppr tycon
-ppr_class env clas = ppr clas
\end{code}
%************************************************************************
%* *
%************************************************************************
-\begin{code}
-pprTyVar (TyVar uniq kind maybe_name _)
- = case maybe_name of
- -- If the tyvar has a name we can safely use just it, I think
- Just n -> pprOccName (getOccName n) <> ifPprDebug pp_debug
- Nothing -> pprUnique uniq
- where
- pp_debug = text "_" <> pp_kind <> pprUnique uniq
-
- pp_kind = case kind of
- TypeKind -> char 'o'
- BoxedTypeKind -> char 't'
- UnboxedTypeKind -> char 'u'
- ArrowKind _ _ -> char 'a'
-\end{code}
-
-We print type-variable binders with their kinds in interface files.
+We print type-variable binders with their kinds in interface files,
+and when in debug mode.
\begin{code}
-pprTyVarBndr tyvar@(TyVar uniq kind name _)
+pprTyVarBndr tyvar
= getPprStyle $ \ sty ->
- if ifaceStyle sty && not (isBoxedTypeKind kind) then
- hcat [pprTyVar tyvar, text " :: ", pprParendKind kind]
- -- See comments with ppDcolon in PprCore.lhs
+ if (ifaceStyle sty || debugStyle sty) && kind /= boxedTypeKind then
+ hsep [ppr tyvar, dcolon, pprParendKind kind]
+ -- See comments with ppDcolon in PprCore.lhs
else
- pprTyVar tyvar
+ ppr tyvar
+ where
+ kind = tyVarKind tyvar
pprTyVarBndrs tyvars = hsep (map pprTyVarBndr tyvars)
\end{code}
-%************************************************************************
-%* *
-\subsection[TyCon]{@TyCon@}
-%* *
-%************************************************************************
-
-ToDo; all this is suspiciously like getOccName!
-
-\begin{code}
-showTyCon :: TyCon -> String
-showTyCon tycon = showSDoc (pprTyCon tycon)
-
-pprTyCon :: TyCon -> SDoc
-pprTyCon tycon = ppr (getName tycon)
-\end{code}
-
-
%************************************************************************
%* *
Grab a name for the type. This is used to determine the type
description for profiling.
+
\begin{code}
getTyDescription :: Type -> String
AppTy fun _ -> getTyDescription fun
FunTy _ res -> '-' : '>' : fun_result res
TyConApp tycon _ -> getOccString tycon
- SynTy ty1 _ -> getTyDescription ty1
+ NoteTy (FTVNote _) ty -> getTyDescription ty
+ NoteTy (SynNote ty1) _ -> getTyDescription ty1
ForAllTy _ ty -> getTyDescription ty
}
where
\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 (\tyvar -> tyvar) initTyVarUnique ty
-
-nmbrType :: (TyVar -> TyVar) -- Mapping for free vars
- -> Unique
- -> Type
- -> Type
-
-nmbrType tyvar_env uniq ty
- = initNmbr tyvar_env uniq (nmbrTy ty)
-
-nmbrTy :: Type -> NmbrM Type
-
-nmbrTy (TyVarTy tv)
- = lookupTyVar tv `thenNmbr` \ new_tv ->
- returnNmbr (TyVarTy new_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)
- = nmbrTys tys `thenNmbr` \ new_tys ->
- returnNmbr (TyConApp tc new_tys)
-
-nmbrTy (SynTy ty1 ty2)
- = nmbrTy ty1 `thenNmbr` \ new_ty1 ->
- nmbrTy ty2 `thenNmbr` \ new_ty2 ->
- returnNmbr (SynTy new_ty1 new_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)
-
-
-nmbrTys tys = mapNmbr nmbrTy tys
-
-lookupTyVar tyvar (NmbrEnv tv_fn tv_env) uniq
- = (uniq, tyvar')
- where
- tyvar' = case lookupUFM tv_env tyvar of
- Just tyvar' -> tyvar'
- Nothing -> tv_fn tyvar
-
-addTyVar tv m (NmbrEnv f_tv tv_ufm) u
- = m tv' nenv u'
- where
- nenv = NmbrEnv f_tv tv_ufm'
- tv_ufm' = addToUFM tv_ufm tv tv'
- tv' = cloneTyVar tv u
- u' = incrUnique u
-\end{code}
-
-Monad stuff
-
-\begin{code}
-data NmbrEnv
- = NmbrEnv (TyVar -> TyVar) (UniqFM TyVar) -- Global and local map for tyvars
-
-type NmbrM a = NmbrEnv -> Unique -> (Unique, a) -- Unique is name supply
-
-initNmbr :: (TyVar -> TyVar) -> Unique -> NmbrM a -> a
-initNmbr tyvar_env uniq m
- = let
- init_nmbr_env = NmbrEnv tyvar_env emptyUFM
- in
- snd (m init_nmbr_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 splitTyConApp_maybe ty of
+ Nothing -> if maybeToBool (splitFunTy_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 == integerDataConKey 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'
+ 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}
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