X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Ftypes%2FPprType.lhs;h=fc80b5035d163858644449ae01e1d52d493ca49c;hb=e663f7b8508aac0df712250bee90488429fcbad6;hp=be52e99e5ec7b73bfe5de239d790d528ab949d4a;hpb=7d61cb61daa5e433a0cb85b34b7f0c58b2f961ff;p=ghc-hetmet.git diff --git a/ghc/compiler/types/PprType.lhs b/ghc/compiler/types/PprType.lhs index be52e99..fc80b50 100644 --- a/ghc/compiler/types/PprType.lhs +++ b/ghc/compiler/types/PprType.lhs @@ -1,591 +1,334 @@ % -% (c) The AQUA Project, Glasgow University, 1996 +% (c) The AQUA Project, Glasgow University, 1996-1998 % -\section[PprType]{Printing Types, TyVars, Classes, ClassOps, TyCons} +\section[PprType]{Printing Types, TyVars, Classes, TyCons} \begin{code} -#include "HsVersions.h" - module PprType( - GenTyVar, pprGenTyVar, - TyCon, pprTyCon, showTyCon, - GenType, - pprGenType, pprParendGenType, + pprKind, pprParendKind, pprType, pprParendType, - pprMaybeTy, - getTypeString, - typeMaybeString, - specMaybeTysSuffix, - GenClass, - GenClassOp, pprGenClassOp + pprConstraint, pprPred, pprTheta, + pprTyVarBndr, pprTyVarBndrs, + + -- Junk + getTyDescription, showTypeCategory ) where -import Ubiq -import IdLoop -- for paranoia checking -import TyLoop -- for paranoia checking -import NameLoop -- for paranoia checking +#include "HsVersions.h" -- friends: -- (PprType can see all the representations it's trying to print) -import Type ( GenType(..), maybeAppTyCon, - splitForAllTy, splitSigmaTy, splitRhoTy, splitAppTy ) -import TyVar ( GenTyVar(..) ) -import TyCon ( TyCon(..), NewOrData ) -import Class ( Class(..), GenClass(..), - ClassOp(..), GenClassOp(..) ) -import Kind ( Kind(..) ) +import TypeRep ( Type(..), TyNote(..), Kind, boxedTypeKind ) -- friend +import Type ( PredType(..), ThetaType, + splitPredTy_maybe, + splitForAllTys, splitSigmaTy, splitRhoTy, + isDictTy, splitTyConApp_maybe, splitFunTy_maybe, + predRepTy, isUTyVar + ) +import Var ( TyVar, tyVarKind ) +import TyCon ( TyCon, isPrimTyCon, isTupleTyCon, isUnboxedTupleTyCon, + maybeTyConSingleCon, isEnumerationTyCon, + tyConArity, tyConName + ) +import Class ( Class ) -- others: -import CStrings ( identToC ) -import CmdLineOpts ( opt_OmitInterfacePragmas ) +import CmdLineOpts ( opt_PprStyle_RawTypes ) import Maybes ( maybeToBool ) -import NameTypes ( ShortName, FullName ) -import Outputable ( ifPprShowAll, isAvarop, interpp'SP ) -import PprStyle ( PprStyle(..), codeStyle, showUserishTypes ) -import Pretty -import TysWiredIn ( listTyCon ) -import Unique ( pprUnique10, pprUnique ) -import Usage ( UVar(..), pprUVar ) -import Util -\end{code} - -\begin{code} -instance (Eq tyvar, Outputable tyvar, - Eq uvar, Outputable uvar ) => Outputable (GenType tyvar uvar) where - ppr sty ty = pprGenType sty ty - -instance Outputable TyCon where - ppr sty tycon = pprTyCon sty tycon - -instance Outputable (GenClass tyvar uvar) where - -- we use pprIfaceClass for printing in interfaces - ppr sty (Class u n _ _ _ _ _ _ _ _) = ppr sty n - -instance Outputable ty => Outputable (GenClassOp ty) where - ppr sty clsop = pprGenClassOp sty clsop - -instance Outputable (GenTyVar flexi) where - ppr sty tv = pprGenTyVar sty tv - --- and two SPECIALIZEd ones: -instance Outputable {-Type, i.e.:-}(GenType TyVar UVar) where - ppr sty ty = pprGenType sty ty - -instance Outputable {-TyVar, i.e.:-}(GenTyVar Usage) where - ppr sty ty = pprGenTyVar sty ty +import Name ( getOccString, getOccName ) +import Outputable +import PprEnv +import Unique ( Uniquable(..) ) +import PrelNames -- quite a few *Keys \end{code} %************************************************************************ %* * -\subsection[Type]{@Type@} +\subsection{The external interface} %* * %************************************************************************ -@pprGenType@ is the std @Type@ printer; the overloaded @ppr@ function is -defined to use this. @pprParendGenType@ is the same, except it puts -parens around the type, except for the atomic cases. @pprParendGenType@ +@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} -pprGenType, pprParendGenType :: (Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar) - => PprStyle -> GenType tyvar uvar -> Pretty - -pprGenType sty ty = ppr_ty sty (initial_ve sty) tOP_PREC ty -pprParendGenType sty ty = ppr_ty sty (initial_ve sty) tYCON_PREC ty - -pprType sty ty = ppr_ty sty (initial_ve sty) tOP_PREC (ty :: Type) -pprParendType sty ty = ppr_ty sty (initial_ve sty) tYCON_PREC (ty :: Type) - -pprMaybeTy :: (Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar) - => PprStyle -> Maybe (GenType tyvar uvar) -> Pretty -pprMaybeTy sty Nothing = ppChar '*' -pprMaybeTy sty (Just ty) = pprParendGenType sty ty -\end{code} - -\begin{code} -ppr_ty :: (Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar) - => PprStyle -> VarEnv tyvar uvar -> Int - -> GenType tyvar uvar - -> Pretty +pprType, pprParendType :: Type -> SDoc +pprType ty = ppr_ty pprTyEnv tOP_PREC ty +pprParendType ty = ppr_ty pprTyEnv tYCON_PREC ty -ppr_ty sty env ctxt_prec (TyVarTy tyvar) - = ppr_tyvar env tyvar +pprKind, pprParendKind :: Kind -> SDoc +pprKind = pprType +pprParendKind = pprParendType -ppr_ty sty env ctxt_prec (TyConTy tycon usage) - = ppr sty tycon +pprPred :: PredType -> SDoc +pprPred (Class clas tys) = pprConstraint clas tys +pprPred (IParam n ty) = hsep [ptext SLIT("?") <> ppr n, + ptext SLIT("::"), ppr ty] -ppr_ty sty env ctxt_prec ty@(ForAllTy _ _) - | showUserishTypes sty = ppr_ty sty env' ctxt_prec body_ty - - | otherwise = ppSep [ ppPStr SLIT("_forall_"), - ppIntersperse pp'SP pp_tyvars, - ppPStr SLIT("=>"), - ppr_ty sty env' ctxt_prec body_ty - ] - where - (tyvars, body_ty) = splitForAllTy ty - env' = foldl add_tyvar env tyvars - pp_tyvars = map (ppr_tyvar env') tyvars - -ppr_ty sty env ctxt_prec (ForAllUsageTy uv uvs ty) - = panic "ppr_ty:ForAllUsageTy" - -ppr_ty sty env ctxt_prec ty@(FunTy (DictTy _ _ _) _ _) - | showUserishTypes sty - -- Print a nice looking context (Eq a, Text b) => ... - = ppSep [ppBesides [ppLparen, - ppIntersperse pp'SP (map (ppr_dict sty env tOP_PREC) theta), - ppRparen], - ppPStr SLIT("=>"), - ppr_ty sty env ctxt_prec body_ty - ] - where - (theta, body_ty) = splitRhoTy ty - -ppr_ty sty env ctxt_prec (FunTy ty1 ty2 usage) - -- We fiddle the precedences passed to left/right branches, - -- so that right associativity comes out nicely... - = maybeParen ctxt_prec fUN_PREC - (ppCat [ppr_ty sty env fUN_PREC ty1, - ppPStr SLIT("->"), - ppr_ty sty env tOP_PREC ty2]) - -ppr_ty sty env ctxt_prec ty@(AppTy _ _) - = ppr_corner sty env ctxt_prec fun_ty arg_tys - where - (fun_ty, arg_tys) = splitAppTy ty +pprConstraint :: Class -> [Type] -> SDoc +pprConstraint clas tys = ppr clas <+> hsep (map pprParendType tys) -ppr_ty PprInterface env ctxt_prec (SynTy tycon tys expansion) - -- always expand types in an interface - = ppr_ty PprInterface env ctxt_prec expansion +pprTheta :: ThetaType -> SDoc +pprTheta theta = parens (hsep (punctuate comma (map pprPred theta))) -ppr_ty sty env ctxt_prec (SynTy tycon tys expansion) - = ppBeside - (ppr_app sty env ctxt_prec (ppr sty tycon) tys) - (ifPprShowAll sty (ppCat [ppStr " {- expansion:", - ppr_ty sty env tOP_PREC expansion, - ppStr "-}"])) +instance Outputable Type where + ppr ty = pprType ty -ppr_ty sty env ctxt_prec (DictTy clas ty usage) - = ppr_dict sty env ctxt_prec (clas, ty) +instance Outputable PredType where + ppr = pprPred +\end{code} --- Some help functions -ppr_corner sty env ctxt_prec (TyConTy FunTyCon usage) arg_tys - = ASSERT(length arg_tys == 2) - ppr_ty sty env ctxt_prec (FunTy ty1 ty2 usage) - where - (ty1:ty2:_) = arg_tys +%************************************************************************ +%* * +\subsection{Pretty printing} +%* * +%************************************************************************ -ppr_corner sty env ctxt_prec (TyConTy (TupleTyCon a) usage) arg_tys - = ASSERT(length arg_tys == a) - ppBesides [ppLparen, arg_tys_w_commas, ppRparen] - where - arg_tys_w_commas = ppIntersperse pp'SP (map (ppr_ty sty env tOP_PREC) arg_tys) +Precedence +~~~~~~~~~~ +@ppr_ty@ takes an @Int@ that is the precedence of the context. +The precedence levels are: +\begin{description} +\item[tOP_PREC] No parens required. +\item[fUN_PREC] Left hand argument of a function arrow. +\item[tYCON_PREC] Argument of a type constructor. +\end{description} -ppr_corner sty env ctxt_prec (TyConTy tycon usage) arg_tys - | tycon == listTyCon - = ASSERT(length arg_tys == 1) - ppBesides [ppLbrack, ppr_ty sty env tOP_PREC ty1, ppRbrack] - where - (ty1:_) = arg_tys - -ppr_corner sty env ctxt_prec (TyConTy tycon usage) arg_tys - = ppr_app sty env ctxt_prec (ppr sty tycon) arg_tys - -ppr_corner sty env ctxt_prec (TyVarTy tyvar) arg_tys - = ppr_app sty env ctxt_prec (ppr_tyvar env tyvar) arg_tys - - -ppr_app sty env ctxt_prec pp_fun [] - = pp_fun -ppr_app sty env ctxt_prec pp_fun arg_tys - = maybeParen ctxt_prec tYCON_PREC (ppCat [pp_fun, arg_tys_w_spaces]) - where - arg_tys_w_spaces = ppIntersperse ppSP (map (ppr_ty sty env tYCON_PREC) arg_tys) +\begin{code} +tOP_PREC = (0 :: Int) -- type in ParseIface.y +fUN_PREC = (1 :: Int) -- btype in ParseIface.y +tYCON_PREC = (2 :: Int) -- atype in ParseIface.y -ppr_dict sty env ctxt_prec (clas, ty) - = maybeParen ctxt_prec tYCON_PREC - (ppCat [ppr sty clas, ppr_ty sty env tYCON_PREC ty]) +maybeParen ctxt_prec inner_prec pretty + | ctxt_prec < inner_prec = pretty + | otherwise = parens pretty \end{code} -Nota Bene: we must assign print-names to the forall'd type variables -alphabetically, with the first forall'd variable having the alphabetically -first name. Reason: so anyone reading the type signature printed without -explicit forall's will be able to reconstruct them in the right order. - \begin{code} --- Entirely local to this module -data VarEnv tyvar uvar - = VE [Pretty] -- Tyvar pretty names - (tyvar -> Pretty) -- Tyvar lookup function - [Pretty] -- Uvar pretty names - (uvar -> Pretty) -- Uvar lookup function - -initial_ve PprForC = VE [] (\tv -> ppChar '*') - [] (\tv -> ppChar '#') - -initial_ve sty = VE tv_pretties (ppr sty) - uv_pretties (ppr sty) +ppr_ty :: PprEnv TyVar -> Int -> Type -> SDoc +ppr_ty env ctxt_prec (TyVarTy tyvar) + = pTyVarO env tyvar + +ppr_ty env ctxt_prec ty@(TyConApp tycon tys) + -- KIND CASE; it's of the form (Type x) + | 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 (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 + && 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 '#') + + -- LIST CASE + | tycon `hasKey` 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 + | maybeToBool maybe_pred + = braces (ppr_pred env pred) + + -- NO-ARGUMENT CASE (=> no parens) + | null tys + = ppr tycon + + -- GENERAL CASE + | otherwise + = maybeParen ctxt_prec tYCON_PREC (sep [ppr tycon, nest 4 tys_w_spaces]) + where - tv_pretties = map (\ c -> ppChar c ) ['a' .. 'h'] - ++ - map (\ n -> ppBeside (ppChar 'a') (ppInt n)) - ([0 .. ] :: [Int]) -- a0 ... aN + n_tys = length tys + (ty1:_) = tys + Just pred = maybe_pred + maybe_pred = splitPredTy_maybe ty -- Checks class and arity + tys_w_commas = sep (punctuate comma (map (ppr_ty env tOP_PREC) tys)) + tys_w_spaces = sep (map (ppr_ty env tYCON_PREC) tys) + + + +ppr_ty env ctxt_prec ty@(ForAllTy _ _) + = getPprStyle $ \ sty -> + maybeParen ctxt_prec fUN_PREC $ + 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 - uv_pretties = map (\ c -> ppChar c ) ['u' .. 'y'] - ++ - map (\ n -> ppBeside (ppChar 'u') (ppInt n)) - ([0 .. ] :: [Int]) -- u0 ... uN + 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 env) theta))) + <+> ptext SLIT("=>") -ppr_tyvar (VE _ ppr _ _) tyvar = ppr tyvar -ppr_uvar (VE _ _ _ ppr) uvar = ppr uvar -add_tyvar ve@(VE [] _ _ _) tyvar = ve -add_tyvar (VE (tv_pp:tv_supply') tv_ppr uv_supply uv_ppr) tyvar - = VE tv_supply' tv_ppr' uv_supply uv_ppr - where - tv_ppr' tv | tv==tyvar = tv_pp - | otherwise = tv_ppr tv +ppr_ty env 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 env fUN_PREC ty1 + , ptext SLIT("->") <+> ppr_ty env tOP_PREC ty2 + ] -add_uvar ve@(VE _ _ [] _) uvar = ve -add_uvar (VE tv_supply tv_ppr (uv_pp:uv_supply') uv_ppr) uvar - = VE tv_supply tv_ppr uv_supply' uv_ppr' - where - uv_ppr' uv | uv==uvar = uv_pp - | otherwise = uv_ppr uv -\end{code} +ppr_ty env ctxt_prec (AppTy ty1 ty2) + = maybeParen ctxt_prec tYCON_PREC $ + ppr_ty env fUN_PREC ty1 <+> ppr_ty env tYCON_PREC ty2 -@ppr_ty@ takes an @Int@ that is the precedence of the context. -The precedence levels are: -\begin{description} -\item[0:] What we start with. -\item[1:] Function application (@FunTys@). -\item[2:] Type constructors. -\end{description} +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 expansion -- if we don't want to see syntys -\begin{code} -tOP_PREC = (0 :: Int) -fUN_PREC = (1 :: Int) -tYCON_PREC = (2 :: Int) +ppr_ty env ctxt_prec (NoteTy (FTVNote _) ty) = ppr_ty env ctxt_prec ty -maybeParen ctxt_prec inner_prec pretty - | ctxt_prec < inner_prec = pretty - | otherwise = ppParens pretty -\end{code} +ppr_ty env ctxt_prec (PredTy p) = braces (ppr_pred env p) -%************************************************************************ -%* * -\subsection[TyVar]{@TyVar@} -%* * -%************************************************************************ +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] +\end{code} \begin{code} -pprGenTyVar sty (TyVar uniq kind name usage) - = ppBesides [pp_name, pprUnique10 uniq] +pprTyEnv = initPprEnv b (Just ppr) b (Just (\site -> pprTyVarBndr)) b where - pp_name = case name of - Just n -> ppr sty n - Nothing -> case kind of - TypeKind -> ppChar 'o' - BoxedTypeKind -> ppChar 't' - UnboxedTypeKind -> ppChar 'u' - ArrowKind _ _ -> ppChar 'a' + b = panic "PprType:init_ppr_env" \end{code} + %************************************************************************ %* * -\subsection[TyCon]{@TyCon@} +\subsection[TyVar]{@TyVar@} %* * %************************************************************************ -ToDo; all this is suspiciously like getOccurrenceName! +We print type-variable binders with their kinds in interface files, +and when in debug mode. \begin{code} -showTyCon :: PprStyle -> TyCon -> String -showTyCon sty tycon = ppShow 80 (pprTyCon sty tycon) - -pprTyCon :: PprStyle -> TyCon -> Pretty - -pprTyCon sty FunTyCon = ppStr "(->)" -pprTyCon sty (TupleTyCon arity) = ppBeside (ppPStr SLIT("Tuple")) (ppInt arity) -pprTyCon sty (PrimTyCon uniq name kind) = ppr sty name - -pprTyCon sty tycon@(DataTyCon uniq kind name tyvars ctxt cons derivings nd) - = case sty of - PprDebug -> pp_tycon_and_uniq - PprShowAll -> pp_tycon_and_uniq - _ -> pp_tycon +pprTyVarBndr tyvar + = getPprStyle $ \ sty -> + if (ifaceStyle sty && kind /= boxedTypeKind) || debugStyle sty then + hsep [ppr tyvar, dcolon, pprParendKind kind] + -- See comments with ppDcolon in PprCore.lhs + else + ppr tyvar where - pp_tycon_and_uniq = ppBesides [pp_tycon, ppChar '.', pprUnique uniq] - pp_tycon = ppr sty name - -pprTyCon sty (SpecTyCon tc ty_maybes) - = ppBeside (pprTyCon sty tc) - (if (codeStyle sty) - then identToC tys_stuff - else ppPStr tys_stuff) - where - tys_stuff = specMaybeTysSuffix ty_maybes - -pprTyCon sty (SynTyCon uniq name kind arity tyvars expansion) - = ppBeside (ppr sty name) - (ifPprShowAll sty - (ppCat [ ppStr " {-", - ppInt arity, - interpp'SP sty tyvars, - pprParendGenType sty expansion, - ppStr "-}"])) + kind = tyVarKind tyvar + +pprTyVarBndrs tyvars = hsep (map pprTyVarBndr tyvars) \end{code} %************************************************************************ %* * -\subsection[Class]{@Class@} +\subsection{Mumbo jumbo} %* * %************************************************************************ -\begin{code} -pprGenClassOp :: Outputable ty => PprStyle -> GenClassOp ty -> Pretty - -pprGenClassOp sty op = ppr_class_op sty [] op +Grab a name for the type. This is used to determine the type +description for profiling. -ppr_class_op sty tyvars (ClassOp op_name i ty) - = case sty of - PprForC -> pp_C - PprForAsm _ _ -> pp_C - PprInterface -> ppCat [pp_user, ppPStr SLIT("::"), ppr sty ty] - PprShowAll -> ppCat [pp_user, ppPStr SLIT("::"), ppr sty ty] - _ -> pp_user +\begin{code} +getTyDescription :: Type -> String + +getTyDescription ty + = case (splitSigmaTy ty) of { (_, _, tau_ty) -> + case tau_ty of + TyVarTy _ -> "*" + AppTy fun _ -> getTyDescription fun + FunTy _ res -> '-' : '>' : fun_result res + TyConApp tycon _ -> getOccString tycon + NoteTy (FTVNote _) ty -> getTyDescription ty + NoteTy (SynNote ty1) _ -> getTyDescription ty1 + PredTy p -> getTyDescription (predRepTy p) + ForAllTy _ ty -> getTyDescription ty + } where - pp_C = ppPStr op_name - pp_user = if isAvarop op_name - then ppBesides [ppLparen, pp_C, ppRparen] - else pp_C + fun_result (FunTy _ res) = '>' : fun_result res + fun_result other = getTyDescription other \end{code} -%************************************************************************ -%* * -\subsection[]{Mumbo jumbo} -%* * -%************************************************************************ - \begin{code} - -- Shallowly magical; converts a type into something - -- vaguely close to what can be used in C identifier. - -- Don't forget to include the module name!!! -getTypeString :: Type -> [FAST_STRING] -getTypeString ty - | is_prelude_ty = [string] - | otherwise = [mod, string] - where - string = _PK_ (tidy (ppShow 1000 ppr_t)) - ppr_t = pprGenType PprForC ty - -- PprForC expands type synonyms as it goes - - (is_prelude_ty, mod) - = case (maybeAppTyCon ty) of - Nothing -> true_bottom - Just (tycon,_) -> - if fromPreludeCore tycon - then true_bottom - else (False, fst (getOrigName tycon)) - - true_bottom = (True, panic "getTypeString") - - -------------------------------------------------- - -- tidy: very ad-hoc - tidy [] = [] -- done - - tidy (' ' : more) - = case more of - ' ' : _ -> tidy more - '-' : '>' : xs -> '-' : '>' : tidy (no_leading_sps xs) - other -> ' ' : tidy more - - tidy (',' : more) = ',' : tidy (no_leading_sps more) - - tidy (x : xs) = x : tidy xs -- catch all - - no_leading_sps [] = [] - no_leading_sps (' ':xs) = no_leading_sps xs - no_leading_sps other = other - -typeMaybeString :: Maybe Type -> [FAST_STRING] -typeMaybeString Nothing = [SLIT("!")] -typeMaybeString (Just t) = getTypeString t - -specMaybeTysSuffix :: [Maybe Type] -> FAST_STRING -specMaybeTysSuffix ty_maybes - = let - ty_strs = concat (map typeMaybeString ty_maybes) - dotted_tys = [ _CONS_ '.' str | str <- ty_strs ] - in - _CONCAT_ dotted_tys +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 == 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' + 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} - -======================================================== - INTERFACE STUFF; move it out - - -\begin{pseudocode} -pprTyCon sty@PprInterface (SynonymTyCon k n a vs exp unabstract) specs - = ASSERT (null specs) - let - lookup_fn = mk_lookup_tyvar_fn sty vs - pp_tyvars = map lookup_fn vs - in - ppCat [ppPStr SLIT("type"), ppr sty n, ppIntersperse ppSP pp_tyvars, - ppEquals, ppr_ty sty lookup_fn tOP_PREC exp] - -pprTyCon sty@PprInterface this_tycon@(DataTyCon k n a vs ctxt cons derivings data_or_new) specs - = ppHang (ppCat [pp_data_or_new, - pprContext sty ctxt, - ppr sty n, - ppIntersperse ppSP (map lookup_fn vs)]) - 4 - (ppCat [pp_unabstract_condecls, - pp_pragma]) - -- NB: we do not print deriving info in interfaces - where - lookup_fn = mk_lookup_tyvar_fn sty vs - - pp_data_or_new = case data_or_new of - DataType -> ppPStr SLIT("data") - NewType -> ppPStr SLIT("newtype") - - yes_we_print_condecls - = unabstract - && not (null cons) -- we know what they are - && (case (getExportFlag n) of - ExportAbs -> False - other -> True) - - yes_we_print_pragma_condecls - = not yes_we_print_condecls - && not opt_OmitInterfacePragmas - && not (null cons) - && not (maybeToBool (maybePurelyLocalTyCon this_tycon)) - {- && not (any (dataConMentionsNonPreludeTyCon this_tycon) cons) -} - - yes_we_print_pragma_specs - = not (null specs) - - pp_unabstract_condecls - = if yes_we_print_condecls - then ppCat [ppSP, ppEquals, pp_condecls] - else ppNil - - pp_pragma_condecls - = if yes_we_print_pragma_condecls - then pp_condecls - else ppNil - - pp_pragma_specs - = if yes_we_print_pragma_specs - then pp_specs - else ppNil - - pp_pragma - = if (yes_we_print_pragma_condecls || yes_we_print_pragma_specs) - then ppCat [ppStr "\t{-# GHC_PRAGMA", pp_pragma_condecls, pp_pragma_specs, ppStr "#-}"] - else ppNil - - pp_condecls - = let - (c:cs) = cons - in - ppCat ((ppr_con c) : (map ppr_next_con cs)) - where - ppr_con con - = let - (_, _, con_arg_tys, _) = dataConSig con - in - ppCat [pprNonOp PprForUser con, -- the data con's name... - ppIntersperse ppSP (map (ppr_ty sty lookup_fn tYCON_PREC) con_arg_tys)] - - ppr_next_con con = ppCat [ppChar '|', ppr_con con] - - pp_specs - = ppBesides [ppPStr SLIT("_SPECIALIZE_ "), pp_the_list [ - ppCat [ppLbrack, ppInterleave ppComma (map pp_maybe ty_maybes), ppRbrack] - | ty_maybes <- specs ]] - - pp_the_list [p] = p - pp_the_list (p:ps) = ppAbove (ppBeside p ppComma) (pp_the_list ps) - - pp_maybe Nothing = pp_NONE - pp_maybe (Just ty) = pprParendGenType sty ty - - pp_NONE = ppPStr SLIT("_N_") - -pprTyCon PprInterface (TupleTyCon a) specs - = ASSERT (null specs) - ppCat [ ppStr "{- Tuple", ppInt a, ppStr "-}" ] - -pprTyCon PprInterface (PrimTyCon k n a kind_fn) specs - = ASSERT (null specs) - ppCat [ ppStr "{- data", ppr PprForUser n, ppStr " *built-in* -}" ] - - - - - -pprIfaceClass :: (Id -> Id) -> IdEnv UnfoldingDetails -> Class -> Pretty - -pprIfaceClass better_id_fn inline_env - (Class k n tyvar super_classes sdsels ops sels defms insts links) - = let - sdsel_infos = map (getIdInfo . better_id_fn) sdsels - in - ppAboves [ ppCat [ppPStr SLIT("class"), ppr_theta tyvar super_classes, - ppr sty n, lookup_fn tyvar, - if null sdsel_infos - || opt_OmitInterfacePragmas - || (any boringIdInfo sdsel_infos) - -- ToDo: really should be "all bor..." - -- but then parsing is more tedious, - -- and this is really as good in practice. - then ppNil - else pp_sdsel_pragmas (sdsels `zip` sdsel_infos), - if (null ops) - then ppNil - else ppPStr SLIT("where")], - ppNest 8 (ppAboves - [ ppr_op op (better_id_fn sel) (better_id_fn defm) - | (op,sel,defm) <- zip3 ops sels defms]) ] - where - lookup_fn = mk_lookup_tyvar_fn sty [tyvar] - - ppr_theta :: TyVar -> [Class] -> Pretty - ppr_theta tv [] = ppNil - ppr_theta tv super_classes - = ppBesides [ppLparen, - ppIntersperse pp'SP{-'-} (map ppr_assert super_classes), - ppStr ") =>"] - where - ppr_assert (Class _ n _ _ _ _ _ _ _ _) = ppCat [ppr sty n, lookup_fn tv] - - pp_sdsel_pragmas sdsels_and_infos - = ppCat [ppStr "{-# GHC_PRAGMA {-superdicts-}", - ppIntersperse pp'SP{-'-} - [ppIdInfo sty sdsel False{-NO specs-} better_id_fn inline_env info - | (sdsel, info) <- sdsels_and_infos ], - ppStr "#-}"] - - ppr_op op opsel_id defm_id - = let - stuff = ppBeside (ppChar '\t') (ppr_class_op sty [tyvar] op) - in - if opt_OmitInterfacePragmas - then stuff - else ppAbove stuff - (ppCat [ppStr "\t {-# GHC_PRAGMA", ppAbove pp_opsel pp_defm, ppStr "#-}"]) - where - pp_opsel = ppCat [ppPStr SLIT("{-meth-}"), ppIdInfo sty opsel_id False{-no specs-} better_id_fn inline_env (getIdInfo opsel_id)] - pp_defm = ppCat [ppPStr SLIT("\t\t{-defm-}"), ppIdInfo sty defm_id False{-no specs-} better_id_fn inline_env (getIdInfo defm_id)] -\end{pseudocode}