X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FhsSyn%2FHsSyn.lhs;h=7255d1b7f681a08d2ec596d57b9293eee9bb0e6f;hb=550421384b8364cdaf3135f7859c9f7d7ee1fff1;hp=ea103620c7359e0a2e686cc2c79f0104c971acee;hpb=57d07fb8c739fb50f957c25e8987632d04da3969;p=ghc-hetmet.git diff --git a/ghc/compiler/hsSyn/HsSyn.lhs b/ghc/compiler/hsSyn/HsSyn.lhs index ea10362..7255d1b 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} @@ -9,96 +9,97 @@ therefore, is almost nothing but re-exporting. \begin{code} module HsSyn ( - - -- NB: don't reexport HsCore or HsPragmas; - -- this module tells about "real Haskell" - - module HsSyn, module HsBinds, module HsDecls, module HsExpr, module HsImpExp, - module HsBasic, - module HsMatches, + module HsLit, module HsPat, module HsTypes, - Fixity, NewOrData, IfaceFlavour, - - collectTopBinders, collectMonoBinders + module HsUtils, + Fixity, NewOrData, + + HsModule(..), HsExtCore(..), + collectStmtsBinders, collectStmtBinders, collectLStmtBinders, + collectGroupBinders, collectHsBindLocatedBinders, + collectHsBindBinders, + collectSigTysFromHsBind, collectSigTysFromHsBinds ) where #include "HsVersions.h" -- friends: +import HsDecls import HsBinds -import HsDecls ( HsDecl(..), TyDecl(..), InstDecl(..), ClassDecl(..), - DefaultDecl(..), ForeignDecl(..), ForKind(..), - ExtName(..), isDynamic, FixityDecl(..), - ConDecl(..), ConDetails(..), BangType(..), - IfaceSig(..), HsIdInfo, SpecDataSig(..), - hsDeclName - ) import HsExpr import HsImpExp -import HsBasic -import HsMatches +import HsLit import HsPat import HsTypes -import HsPragmas ( ClassPragmas, ClassOpPragmas, - DataPragmas, GenPragmas, InstancePragmas ) -import HsCore -import BasicTypes ( Fixity, Version, NewOrData, IfaceFlavour, Module ) +import HscTypes ( DeprecTxt ) +import BasicTypes ( Fixity, NewOrData ) +import HsUtils -- others: -import FiniteMap ( FiniteMap ) +import IfaceSyn ( IfaceBinding ) import Outputable -import SrcLoc ( SrcLoc ) -import Bag -import Name ( NamedThing ) +import SrcLoc ( Located(..), unLoc, noLoc ) +import Module ( Module ) +import Bag ( Bag, foldrBag ) \end{code} All we actually declare here is the top-level structure for a module. \begin{code} -data HsModule flexi name pat +data HsModule name = HsModule - Module -- module name - (Maybe Version) -- source interface version number - (Maybe [IE name]) -- export list; Nothing => export everything - -- Just [] => export *nothing* (???) + (Maybe (Located Module))-- Nothing => "module X where" is omitted + -- (in which case the next field is Nothing too) + (Maybe [LIE name]) -- Export list; Nothing => export list omitted, so export everything + -- Just [] => export *nothing* -- Just [...] => as you would expect... - [ImportDecl name] -- We snaffle interesting stuff out of the + [LImportDecl name] -- We snaffle interesting stuff out of the -- imported interfaces early on, adding that -- info to TyDecls/etc; so this list is -- often empty, downstream. - [FixityDecl name] - [HsDecl flexi name pat] -- Type, class, value, and interface signature decls - SrcLoc + [LHsDecl name] -- Type, class, value, and interface signature decls + (Maybe DeprecTxt) -- reason/explanation for deprecation of this module + +data HsExtCore name -- Read from Foo.hcr + = HsExtCore + Module + [TyClDecl name] -- Type declarations only; just as in Haskell source, + -- so that we can infer kinds etc + [IfaceBinding] -- And the bindings \end{code} \begin{code} -instance (NamedThing name, Outputable name, Outputable pat) - => Outputable (HsModule flexi name pat) where +instance (OutputableBndr name) + => Outputable (HsModule name) where - ppr (HsModule name iface_version exports imports fixities - decls src_loc) + ppr (HsModule Nothing _ imports decls _) + = pp_nonnull imports $$ pp_nonnull decls + + ppr (HsModule (Just name) exports imports decls deprec) = vcat [ case exports of - Nothing -> hsep [ptext SLIT("module"), ptext name, ptext SLIT("where")] + Nothing -> pp_header (ptext SLIT("where")) Just es -> vcat [ - hsep [ptext SLIT("module"), ptext name, lparen], - nest 8 (interpp'SP es), - nest 4 (ptext SLIT(") where")) + pp_header lparen, + nest 8 (fsep (punctuate comma (map ppr es))), + nest 4 (ptext SLIT(") where")) ], pp_nonnull imports, - pp_nonnull fixities, pp_nonnull decls ] where - pp_nonnull [] = empty - pp_nonnull xs = vcat (map ppr 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_iface_version Nothing = empty - pp_iface_version (Just n) = hsep [text "{-# INTERFACE", int n, text "#-}"] +pp_nonnull [] = empty +pp_nonnull xs = vcat (map ppr xs) \end{code} @@ -122,19 +123,72 @@ where it should return @[x, y, f, a, b]@ (remember, order important). \begin{code} -collectTopBinders :: HsBinds flexi name (InPat name) -> Bag (name,SrcLoc) -collectTopBinders EmptyBinds = emptyBag -collectTopBinders (MonoBind b _ _) = collectMonoBinders b -collectTopBinders (ThenBinds b1 b2) - = collectTopBinders b1 `unionBags` collectTopBinders b2 - -collectMonoBinders :: MonoBinds flexi name (InPat name) -> Bag (name,SrcLoc) -collectMonoBinders EmptyMonoBinds = emptyBag -collectMonoBinders (PatMonoBind pat grhss_w_binds loc) = listToBag (map (\v->(v,loc)) (collectPatBinders pat)) -collectMonoBinders (FunMonoBind f _ matches loc) = unitBag (f,loc) -collectMonoBinders (VarMonoBind v expr) = error "collectMonoBinders" -collectMonoBinders (CoreMonoBind v expr) = error "collectMonoBinders" -collectMonoBinders (AndMonoBinds bs1 bs2) - = collectMonoBinders bs1 `unionBags` collectMonoBinders bs2 +collectGroupBinders :: [HsBindGroup name] -> [Located name] +collectGroupBinders groups = foldr collect_group [] groups + where + collect_group (HsBindGroup bag sigs is_rec) acc + = foldrBag (collectAcc . unLoc) acc bag + collect_group (HsIPBinds _) acc = acc + + +collectAcc :: HsBind name -> [Located name] -> [Located name] +collectAcc (PatBind pat _) acc = collectLocatedPatBinders pat ++ acc +collectAcc (FunBind f _ _) acc = f : acc +collectAcc (VarBind f _) acc = noLoc f : acc +collectAcc (AbsBinds _ _ dbinds _ binds) acc + = [noLoc dp | (_,dp,_) <- dbinds] ++ acc + -- ++ foldr collectAcc acc binds + -- I don't think we want the binders from the nested binds + -- The only time we collect binders from a typechecked + -- binding (hence see AbsBinds) is in zonking in TcHsSyn + +collectHsBindBinders :: Bag (LHsBind name) -> [name] +collectHsBindBinders binds = map unLoc (collectHsBindLocatedBinders binds) + +collectHsBindLocatedBinders :: Bag (LHsBind name) -> [Located name] +collectHsBindLocatedBinders binds = foldrBag (collectAcc . unLoc) [] binds \end{code} + +%************************************************************************ +%* * +\subsection{Getting patterns out of bindings} +%* * +%************************************************************************ + +Get all the pattern type signatures out of a bunch of bindings + +\begin{code} +collectSigTysFromHsBinds :: [LHsBind name] -> [LHsType name] +collectSigTysFromHsBinds binds = concat (map collectSigTysFromHsBind binds) + +collectSigTysFromHsBind :: LHsBind name -> [LHsType name] +collectSigTysFromHsBind bind + = go (unLoc bind) + where + go (PatBind pat _) = collectSigTysFromPat pat + go (FunBind f _ ms) = go_matches (map unLoc ms) + + -- A binding like x :: a = f y + -- is parsed as FunMonoBind, but for this purpose we + -- want to treat it as a pattern binding + go_matches [] = [] + go_matches (Match [] (Just sig) _ : matches) = sig : go_matches matches + go_matches (match : matches) = go_matches matches +\end{code} + +\begin{code} +collectStmtsBinders :: [LStmt id] -> [Located id] +collectStmtsBinders = concatMap collectLStmtBinders + +collectLStmtBinders = collectStmtBinders . unLoc + +collectStmtBinders :: Stmt id -> [Located id] + -- Id Binders for a Stmt... [but what about pattern-sig type vars]? +collectStmtBinders (BindStmt pat _) = collectLocatedPatBinders pat +collectStmtBinders (LetStmt binds) = collectGroupBinders binds +collectStmtBinders (ExprStmt _ _) = [] +collectStmtBinders (ResultStmt _) = [] +collectStmtBinders (RecStmt ss _ _ _) = collectStmtsBinders ss +collectStmtBinders other = panic "collectStmtBinders" +\end{code}