X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FhsSyn%2FHsSyn.lhs;h=c2feb2af26a4ce2d4782cba58d55b739e0d20686;hb=9fdd90b00f159463165f739c44943e53fb553c19;hp=aa4a6bdc9ba00e520292e24f263d9c386f52628d;hpb=f9120c200bcf613b58d742802172fb4c08171f0d;p=ghc-hetmet.git diff --git a/ghc/compiler/hsSyn/HsSyn.lhs b/ghc/compiler/hsSyn/HsSyn.lhs index aa4a6bd..c2feb2a 100644 --- a/ghc/compiler/hsSyn/HsSyn.lhs +++ b/ghc/compiler/hsSyn/HsSyn.lhs @@ -1,5 +1,5 @@ % -% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996 +% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998 % \section{Haskell abstract syntax definition} @@ -8,59 +8,50 @@ which is declared in the various \tr{Hs*} modules. This module, therefore, is almost nothing but re-exporting. \begin{code} -#include "HsVersions.h" - module HsSyn ( - -- NB: don't reexport HsCore or HsPragmas; + -- NB: don't reexport HsCore -- this module tells about "real Haskell" - HsSyn.. , - HsBinds.. , - HsDecls.. , - HsExpr.. , - HsImpExp.. , - HsLit.. , - HsMatches.. , - HsPat.. , - HsTypes.. + module HsSyn, + module HsBinds, + module HsDecls, + module HsExpr, + module HsImpExp, + module HsLit, + module HsPat, + module HsTypes, + Fixity, NewOrData, + collectHsBinders, collectLocatedHsBinders, + collectMonoBinders, collectLocatedMonoBinders, + hsModuleName, hsModuleImports ) where -import Ubiq +#include "HsVersions.h" -- friends: +import HsDecls import HsBinds -import HsDecls import HsExpr import HsImpExp import HsLit -import HsMatches import HsPat import HsTypes -import HsPragmas ( ClassPragmas, ClassOpPragmas, - DataPragmas, GenPragmas, InstancePragmas ) +import BasicTypes ( Fixity, Version, NewOrData ) + -- others: -import FiniteMap ( FiniteMap ) -import Outputable ( ifPprShowAll, ifnotPprForUser, interpp'SP, Outputable(..) ) -import Pretty +import Name ( NamedThing ) +import Outputable import SrcLoc ( SrcLoc ) -\end{code} - -@Fake@ is a placeholder type; for when tyvars and uvars aren't used. -\begin{code} -data Fake = Fake -instance Eq Fake -instance Outputable Fake +import Module ( ModuleName ) \end{code} All we actually declare here is the top-level structure for a module. \begin{code} -type Version = Int - -data HsModule tyvar uvar name pat +data HsModule name pat = HsModule - Module -- module name + ModuleName -- module name (Maybe Version) -- source interface version number (Maybe [IE name]) -- export list; Nothing => export everything -- Just [] => export *nothing* (???) @@ -69,51 +60,92 @@ data HsModule tyvar uvar name pat -- imported interfaces early on, adding that -- info to TyDecls/etc; so this list is -- often empty, downstream. - [FixityDecl name] - [TyDecl name] - [SpecDataSig name] -- user pragmas that modify TyDecls - [ClassDecl tyvar uvar name pat] - [InstDecl tyvar uvar name pat] - [SpecInstSig name] -- user pragmas that modify InstDecls - [DefaultDecl name] - (HsBinds tyvar uvar name pat) -- the main stuff, includes source sigs - [Sig name] -- interface sigs + [HsDecl name pat] -- Type, class, value, and interface signature decls + (Maybe DeprecTxt) -- reason/explanation for deprecation of this module SrcLoc \end{code} \begin{code} -instance (NamedThing name, Outputable name, Outputable pat, - Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar) - => Outputable (HsModule tyvar uvar name pat) where - - ppr sty (HsModule name iface_version exports imports fixities - typedecls typesigs classdecls instdecls instsigs - defdecls binds sigs src_loc) - = ppAboves [ - ifPprShowAll sty (ppr sty src_loc), - ifnotPprForUser sty (pp_iface_version iface_version), +instance (NamedThing name, Outputable name, Outputable pat) + => Outputable (HsModule name pat) where + + ppr (HsModule name iface_version exports imports + decls deprec src_loc) + = vcat [ case exports of - Nothing -> ppCat [ppPStr SLIT("module"), ppPStr name, ppPStr SLIT("where")] - Just es -> ppAboves [ - ppCat [ppPStr SLIT("module"), ppPStr name, ppLparen], - ppNest 8 (interpp'SP sty es), - ppNest 4 (ppPStr SLIT(") where")) + Nothing -> pp_header (ptext SLIT("where")) + Just es -> vcat [ + pp_header lparen, + nest 8 (fsep (punctuate comma (map ppr es))), + nest 4 (ptext SLIT(") where")) ], pp_nonnull imports, - pp_nonnull fixities, - pp_nonnull typedecls, - pp_nonnull typesigs, - pp_nonnull classdecls, - pp_nonnull instdecls, - pp_nonnull instsigs, - pp_nonnull defdecls, - ppr sty binds, - pp_nonnull sigs + pp_nonnull decls ] where - pp_nonnull [] = ppNil - pp_nonnull xs = ppAboves (map (ppr sty) xs) + pp_header rest = case deprec of + Nothing -> pp_modname <+> rest + Just d -> vcat [ pp_modname, ppr d, rest ] + + pp_modname = ptext SLIT("module") <+> ppr name + + pp_nonnull [] = empty + pp_nonnull xs = vcat (map ppr xs) + +hsModuleName (HsModule mod_name _ _ _ _ _ _) = mod_name +hsModuleImports (HsModule mod_name vers exports imports decls deprec src_loc) = imports +\end{code} + + +%************************************************************************ +%* * +\subsection{Collecting binders from @HsBinds@} +%* * +%************************************************************************ + +Get all the binders in some @MonoBinds@, IN THE ORDER OF APPEARANCE. + +These functions are here, rather than in HsBinds, to avoid a loop between HsPat and HsBinds. + +\begin{verbatim} +... +where + (x, y) = ... + f i j = ... + [a, b] = ... +\end{verbatim} +it should return @[x, y, f, a, b]@ (remember, order important). + +\begin{code} +collectLocatedHsBinders :: HsBinds name (InPat name) -> [(name,SrcLoc)] +collectLocatedHsBinders EmptyBinds = [] +collectLocatedHsBinders (MonoBind b _ _) + = collectLocatedMonoBinders b +collectLocatedHsBinders (ThenBinds b1 b2) + = collectLocatedHsBinders b1 ++ collectLocatedHsBinders b2 + +collectHsBinders :: HsBinds name (InPat name) -> [name] +collectHsBinders EmptyBinds = [] +collectHsBinders (MonoBind b _ _) + = collectMonoBinders b +collectHsBinders (ThenBinds b1 b2) + = collectHsBinders b1 ++ collectHsBinders b2 + +collectLocatedMonoBinders :: MonoBinds name (InPat name) -> [(name,SrcLoc)] +collectLocatedMonoBinders binds + = go binds [] + where + go EmptyMonoBinds acc = acc + go (PatMonoBind pat _ loc) acc = map (\v->(v,loc)) (collectPatBinders pat) ++ acc + go (FunMonoBind f _ _ loc) acc = (f,loc) : acc + go (AndMonoBinds bs1 bs2) acc = go bs1 (go bs2 acc) - pp_iface_version Nothing = ppNil - pp_iface_version (Just n) = ppCat [ppStr "{-# INTERFACE", ppInt n, ppStr "#-}"] +collectMonoBinders :: MonoBinds name (InPat name) -> [name] +collectMonoBinders binds + = go binds [] + where + go EmptyMonoBinds acc = acc + go (PatMonoBind pat _ loc) acc = collectPatBinders pat ++ acc + go (FunMonoBind f _ _ loc) acc = f : acc + go (AndMonoBinds bs1 bs2) acc = go bs1 (go bs2 acc) \end{code}