%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1995
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[PrefixToHS]{Support routines for converting ``prefix form'' to Haskell abstract syntax}
Support routines for reading prefix-form from the Lex/Yacc parser.
\begin{code}
-#include "HsVersions.h"
-
module PrefixToHs (
- cvBinds,
+ cvValSig,
cvClassOpSig,
cvInstDeclSig,
- cvInstDecls,
+
+ cvBinds,
+ cvMonoBindsAndSigs,
cvMatches,
- cvMonoBinds,
- cvSepdBinds,
- cvValSig,
- sepDeclsForInterface,
- sepDeclsForTopBinds,
- sepDeclsIntoSigsAndBinds
+ cvOtherDecls,
+ cvForeignDecls -- HACK
+
) where
-IMPORT_Trace -- ToDo: rm
-import Pretty
-
-import AbsSyn
-import HsCore -- ****** NEED TO SEE CONSTRUCTORS ******
-import HsPragmas -- ****** NEED TO SEE CONSTRUCTORS ******
-import Outputable
-import PrefixSyn
-import ProtoName -- ProtoName(..), etc.
-import SrcLoc ( mkSrcLoc2 )
-import Util
+#include "HsVersions.h"
+
+import PrefixSyn -- and various syntaxen.
+import HsSyn
+import RdrHsSyn
+
+import BasicTypes ( RecFlag(..) )
+import SrcLoc ( mkSrcLoc )
+import Util ( mapAndUnzip, panic, assertPanic )
\end{code}
%************************************************************************
%* *
%************************************************************************
-\begin{code}
-cvInstDecls :: Bool -> FAST_STRING -> FAST_STRING
- -> [FAST_STRING -> FAST_STRING -> Bool -> ProtoNameInstDecl] -- incomplete InstDecls
- -> [ProtoNameInstDecl]
-
-cvInstDecls from_here orig_modname informant_modname decls
- = [ decl_almost orig_modname informant_modname from_here
- | decl_almost <- decls ]
-\end{code}
-
We make a point not to throw any user-pragma ``sigs'' at
these conversion functions:
+
\begin{code}
cvValSig, cvClassOpSig, cvInstDeclSig :: SigConverter
-cvValSig (RdrTySig vars poly_ty pragmas src_loc)
- = [ Sig v poly_ty (cvt_pragmas pragmas) src_loc | v <- vars ]
- where
- cvt_pragmas RdrNoPragma = NoGenPragmas
- cvt_pragmas (RdrGenPragmas ps) = ps
+cvValSig sig = sig
-cvClassOpSig (RdrTySig vars poly_ty pragmas src_loc)
- = [ ClassOpSig v poly_ty (cvt_pragmas pragmas) src_loc | v <- vars ]
- where
- cvt_pragmas RdrNoPragma = NoClassOpPragmas
- cvt_pragmas (RdrClassOpPragmas ps) = ps
+cvInstDeclSig sig = sig
-cvInstDeclSig (RdrSpecValSig sigs) = sigs
-cvInstDeclSig (RdrInlineValSig sig) = [ sig ]
-cvInstDeclSig (RdrDeforestSig sig) = [ sig ]
-cvInstDeclSig (RdrMagicUnfoldingSig sig) = [ sig ]
+cvClassOpSig (Sig var poly_ty src_loc) = ClassOpSig var Nothing poly_ty src_loc
+cvClassOpSig sig = sig
\end{code}
+
%************************************************************************
%* *
-\subsection[cvBinds-etc]{Converting to @Binds@, @MonoBinds@, etc.}
+\subsection[cvBinds-etc]{Converting to @HsBinds@, @MonoBinds@, etc.}
%* *
%************************************************************************
analyser.
\begin{code}
-cvBinds :: SrcFile -> SigConverter -> RdrBinding -> ProtoNameBinds
-cvBinds sf sig_cvtr raw_binding
- = cvSepdBinds sf sig_cvtr (sepDeclsForBinds raw_binding)
-
-cvSepdBinds :: SrcFile -> SigConverter -> [RdrBinding] -> ProtoNameBinds
-cvSepdBinds sf sig_cvtr bindings
- = case (mkMonoBindsAndSigs sf sig_cvtr bindings) of { (mbs, sigs) ->
- if (null sigs)
- then SingleBind (RecBind mbs)
- else BindWith (RecBind mbs) sigs
- }
-
-cvMonoBinds :: SrcFile -> [RdrBinding] -> ProtoNameMonoBinds
-cvMonoBinds sf bindings
- = case (mkMonoBindsAndSigs sf bottom bindings) of { (mbs,sigs) ->
- if (null sigs)
- then mbs
- else panic "cvMonoBinds: some sigs present"
+cvBinds :: SrcFile -> SigConverter -> RdrBinding -> RdrNameHsBinds
+cvBinds sf sig_cvtr binding
+ = case (cvMonoBindsAndSigs sf sig_cvtr binding) of { (mbs, sigs) ->
+ MonoBind mbs sigs Recursive
}
- where
- bottom = panic "cvMonoBinds: sig converter!"
\end{code}
\begin{code}
-mkMonoBindsAndSigs :: SrcFile
+cvMonoBindsAndSigs :: SrcFile
-> SigConverter
- -> [RdrBinding]
- -> (ProtoNameMonoBinds, [ProtoNameSig])
+ -> RdrBinding
+ -> (RdrNameMonoBinds, [RdrNameSig])
-mkMonoBindsAndSigs sf sig_cvtr fbs
- = foldl mangle_bind (EmptyMonoBinds, []) fbs
+cvMonoBindsAndSigs sf sig_cvtr fb
+ = mangle_bind (EmptyMonoBinds, []) fb
where
-- If the function being bound has at least one argument, then the
-- guarded right hand sides of each pattern binding are knitted
-- function. Otherwise there is only one pattern, which is paired
-- with a guarded right hand side.
- mangle_bind (b_acc, s_acc) sig@(RdrTySig _ _ _ _)
- = (b_acc, s_acc ++ sig_cvtr sig)
+ mangle_bind acc (RdrAndBindings fb1 fb2)
+ = mangle_bind (mangle_bind acc fb1) fb2
- mangle_bind (b_acc, s_acc) (RdrSpecValSig sig) = (b_acc, sig ++ s_acc)
- mangle_bind (b_acc, s_acc) (RdrInlineValSig sig) = (b_acc, sig : s_acc)
- mangle_bind (b_acc, s_acc) (RdrDeforestSig sig) = (b_acc, sig : s_acc)
- mangle_bind (b_acc, s_acc) (RdrMagicUnfoldingSig sig) = (b_acc, sig : s_acc)
+ mangle_bind (b_acc, s_acc) (RdrSig sig)
+ = (b_acc, sig_cvtr sig : s_acc)
mangle_bind (b_acc, s_acc)
- (RdrPatternBinding lousy_srcline [patbinding@(RdrMatch good_srcline _ _ _ _)])
+ (RdrPatternBinding lousy_srcline [patbinding])
-- WDP: the parser has trouble getting a good line-number on RdrPatternBindings.
= case (cvPatMonoBind sf patbinding) of { (pat, grhss, binds) ->
let
- src_loc = mkSrcLoc2 sf good_srcline
+ src_loc = mkSrcLoc sf good_srcline
in
(b_acc `AndMonoBinds`
PatMonoBind pat (GRHSsAndBindsIn grhss binds) src_loc, s_acc)
}
+ where
+ good_srcline = case patbinding of
+ RdrMatch_NoGuard ln _ _ _ _ -> ln
+ RdrMatch_Guards ln _ _ _ _ -> ln
+
mangle_bind _ (RdrPatternBinding _ _)
= panic "mangleBinding: more than one pattern on a RdrPatternBinding"
mangle_bind (b_acc, s_acc) (RdrFunctionBinding srcline patbindings)
-- must be a function binding...
- = case (cvFunMonoBind sf patbindings) of { (var, matches) ->
+ = case (cvFunMonoBind sf patbindings) of { (var, inf, matches) ->
(b_acc `AndMonoBinds`
- FunMonoBind var matches (mkSrcLoc2 sf srcline), s_acc)
+ FunMonoBind var inf matches (mkSrcLoc sf srcline), s_acc)
}
+
+ mangle_bind (b_acc, s_acc) other = (b_acc, s_acc)
+ -- Ignore class decls, instance decls etc
\end{code}
\begin{code}
-cvPatMonoBind :: SrcFile -> RdrMatch -> (ProtoNamePat, [ProtoNameGRHS], ProtoNameBinds)
+cvPatMonoBind :: SrcFile -> RdrMatch -> (RdrNamePat, [RdrNameGRHS], RdrNameHsBinds)
+
+cvPatMonoBind sf (RdrMatch_NoGuard srcline srcfun pat expr binding)
+ = (pat, unguardedRHS expr (mkSrcLoc sf srcline), cvBinds sf cvValSig binding)
-cvPatMonoBind sf (RdrMatch srcline srcfun pat guardedexprs binding)
- = (pat, cvGRHSs srcfun sf srcline guardedexprs, cvBinds sf cvValSig binding)
+cvPatMonoBind sf (RdrMatch_Guards srcline srcfun pat guardedexprs binding)
+ = (pat, map (cvGRHS sf srcline) guardedexprs, cvBinds sf cvValSig binding)
-cvFunMonoBind :: SrcFile -> [RdrMatch] -> (ProtoName {-VarName-}, [ProtoNameMatch])
+cvFunMonoBind :: SrcFile -> [RdrMatch] -> (RdrName {-VarName-}, Bool {-InfixDefn-}, [RdrNameMatch])
+
+cvFunMonoBind sf matches
+ = (head srcfuns, head infixdefs, cvMatches sf False matches)
+ where
+ (srcfuns, infixdefs) = mapAndUnzip get_mdef matches
+ -- ToDo: Check for consistent srcfun and infixdef
+
+ get_mdef (RdrMatch_NoGuard _ sfun pat _ _) = get_pdef pat
+ get_mdef (RdrMatch_Guards _ sfun pat _ _) = get_pdef pat
+
+ get_pdef (ConPatIn fn _) = (fn, False)
+ get_pdef (ConOpPatIn _ op _ _) = (op, True)
+ get_pdef (ParPatIn pat) = get_pdef pat
-cvFunMonoBind sf matches@((RdrMatch srcline srcfun pat guardedexprs binding):_)
- = ( Unk srcfun, -- cheating ...
- cvMatches sf False matches )
-cvMatches :: SrcFile -> Bool -> [RdrMatch] -> [ProtoNameMatch]
-cvMatch :: SrcFile -> Bool -> RdrMatch -> ProtoNameMatch
+cvMatches :: SrcFile -> Bool -> [RdrMatch] -> [RdrNameMatch]
+cvMatch :: SrcFile -> Bool -> RdrMatch -> RdrNameMatch
cvMatches sf is_case matches = map (cvMatch sf is_case) matches
-cvMatch sf is_case (RdrMatch srcline srcfun pat guardedexprs binding)
+cvMatch sf is_case rdr_match
= foldr PatMatch
- (GRHSMatch (GRHSsAndBindsIn (cvGRHSs srcfun sf srcline guardedexprs)
- (cvBinds sf cvValSig binding)))
+ (GRHSMatch (GRHSsAndBindsIn guarded_exprs (cvBinds sf cvValSig binding)))
-- For a FunMonoBinds, the first flattened "pattern" is
-- just the function name, and we don't want to keep it.
-- For a case expr, it's (presumably) a constructor name -- and
-- we most certainly want to keep it! Hence the monkey busines...
--- (trace ("cvMatch:"++(ppShow 80 (ppr PprDebug pat))) (
(if is_case then -- just one pattern: leave it untouched...
- [pat']
- else
- case pat' of
- ConPatIn _ pats -> pats
+ [pat]
+ else -- function pattern; extract arg patterns...
+ case pat of ConPatIn fn pats -> pats
+ ConOpPatIn p1 op _ p2 -> [p1,p2]
+ ParPatIn pat -> panic "PrefixToHs.cvMatch:ParPatIn"
)
--- ))
where
- pat' = doctor_pat pat
-
- -- a ConOpPatIn in the corner may be handled by converting it to
- -- ConPatIn...
-
- doctor_pat (ConOpPatIn p1 op p2) = ConPatIn op [p1, p2]
- doctor_pat other_pat = other_pat
-
-cvGRHSs :: FAST_STRING -> SrcFile -> SrcLine -> [(ProtoNameExpr, ProtoNameExpr)] -> [ProtoNameGRHS]
-
-cvGRHSs sfun sf sl guarded_exprs = map (cvGRHS sfun sf sl) guarded_exprs
-
-cvGRHS :: FAST_STRING -> SrcFile -> SrcLine -> (ProtoNameExpr, ProtoNameExpr) -> ProtoNameGRHS
-
-cvGRHS sfun sf sl (Var v@(Unk str), e)
- | str == SLIT("__o") -- "__otherwise" ToDo: de-urgh-ify
- = OtherwiseGRHS e (mkSrcLoc2 sf sl)
-
-cvGRHS sfun sf sl (g, e)
- = GRHS g e (mkSrcLoc2 sf sl)
+ (pat, binding, guarded_exprs)
+ = case rdr_match of
+ RdrMatch_NoGuard ln b c expr d -> (c,d, unguardedRHS expr (mkSrcLoc sf ln))
+ RdrMatch_Guards ln b c gd_exps d -> (c,d, map (cvGRHS sf ln) gd_exps)
+
+cvGRHS :: SrcFile -> SrcLine -> ([RdrNameStmt], RdrNameHsExpr) -> RdrNameGRHS
+cvGRHS sf sl (g, e) = GRHS (g ++ [ExprStmt e locn]) locn
+ where
+ locn = mkSrcLoc sf sl
\end{code}
%************************************************************************
%************************************************************************
Separate declarations into all the various kinds:
-\begin{display}
-tys RdrTyData RdrTySynonym
-type "sigs" RdrAbstractTypeSig RdrSpecDataSig
-classes RdrClassDecl
-instances RdrInstDecl
-instance "sigs" RdrSpecInstSig
-defaults RdrDefaultDecl
-binds RdrFunctionBinding RdrPatternBinding RdrTySig
- RdrSpecValSig RdrInlineValSig RdrDeforestSig
- RdrMagicUnfoldingSig
-iimps RdrIfaceImportDecl (interfaces only)
-\end{display}
-
-This function isn't called directly; some other function calls it,
-then checks that what it got is appropriate for that situation.
-(Those functions follow...)
\begin{code}
-sepDecls (RdrTyData a)
- tys tysigs classes insts instsigs defaults binds iimps
- = (a:tys,tysigs,classes,insts,instsigs,defaults,binds,iimps)
-
-sepDecls (RdrTySynonym a)
- tys tysigs classes insts instsigs defaults binds iimps
- = (a:tys,tysigs,classes,insts,instsigs,defaults,binds,iimps)
-
-sepDecls a@(RdrFunctionBinding _ _)
- tys tysigs classes insts instsigs defaults binds iimps
- = (tys,tysigs,classes,insts,instsigs,defaults,a:binds,iimps)
-
-sepDecls a@(RdrPatternBinding _ _)
- tys tysigs classes insts instsigs defaults binds iimps
- = (tys,tysigs,classes,insts,instsigs,defaults,a:binds,iimps)
-
--- RdrAndBindings catered for below...
-
-sepDecls (RdrClassDecl a)
- tys tysigs classes insts instsigs defaults binds iimps
- = (tys,tysigs,a:classes,insts,instsigs,defaults,binds,iimps)
-
-sepDecls (RdrInstDecl a)
- tys tysigs classes insts instsigs defaults binds iimps
- = (tys,tysigs,classes,a:insts,instsigs,defaults,binds,iimps)
-
-sepDecls (RdrDefaultDecl a)
- tys tysigs classes insts instsigs defaults binds iimps
- = (tys,tysigs,classes,insts,instsigs,a:defaults,binds,iimps)
-
-sepDecls a@(RdrTySig _ _ _ _)
- tys tysigs classes insts instsigs defaults binds iimps
- = (tys,tysigs,classes,insts,instsigs,defaults,a:binds,iimps)
-
-sepDecls (RdrIfaceImportDecl a)
- tys tysigs classes insts instsigs defaults binds iimps
- = (tys,tysigs,classes,insts,instsigs,defaults,binds,a:iimps)
-
-sepDecls a@(RdrSpecValSig _)
- tys tysigs classes insts instsigs defaults binds iimps
- = (tys,tysigs,classes,insts,instsigs,defaults,a:binds,iimps)
-
-sepDecls a@(RdrInlineValSig _)
- tys tysigs classes insts instsigs defaults binds iimps
- = (tys,tysigs,classes,insts,instsigs,defaults,a:binds,iimps)
-
-sepDecls a@(RdrDeforestSig _)
- tys tysigs classes insts instsigs defaults binds iimps
- = (tys,tysigs,classes,insts,instsigs,defaults,a:binds,iimps)
-
-sepDecls a@(RdrMagicUnfoldingSig _)
- tys tysigs classes insts instsigs defaults binds iimps
- = (tys,tysigs,classes,insts,instsigs,defaults,a:binds,iimps)
-
-sepDecls (RdrSpecInstSig a)
- tys tysigs classes insts instsigs defaults binds iimps
- = (tys,tysigs,classes,insts,a:instsigs,defaults,binds,iimps)
-
-sepDecls (RdrAbstractTypeSig a)
- tys tysigs classes insts instsigs defaults binds iimps
- = (tys,a:tysigs,classes,insts,instsigs,defaults,binds,iimps)
-
-sepDecls (RdrSpecDataSig a)
- tys tysigs classes insts instsigs defaults binds iimps
- = (tys,a:tysigs,classes,insts,instsigs,defaults,binds,iimps)
-
-sepDecls RdrNullBind
- tys tysigs classes insts instsigs defaults binds iimps
- = (tys,tysigs,classes,insts,instsigs,defaults,binds,iimps)
-
-sepDecls (RdrAndBindings bs1 bs2)
- tys tysigs classes insts instsigs defaults binds iimps
- = case (sepDecls bs2 tys tysigs classes insts instsigs defaults binds iimps) of {
- (tys,tysigs,classes,insts,instsigs,defaults,binds,iimps) ->
- sepDecls bs1 tys tysigs classes insts instsigs defaults binds iimps
- }
-\end{code}
-
-\begin{code}
-sepDeclsForTopBinds binding
- = case (sepDecls binding [] [] [] [] [] [] [] [])
- of { (tys,tysigs,classes,insts,instsigs,defaults,binds,iimps) ->
- ASSERT (null iimps)
- (tys,tysigs,classes,insts,instsigs,defaults,binds)
- }
-
-sepDeclsForBinds binding
- = case (sepDecls binding [] [] [] [] [] [] [] [])
- of { (tys,tysigs,classes,insts,instsigs,defaults,binds,iimps) ->
- ASSERT ((null tys)
- && (null tysigs)
- && (null classes)
- && (null insts)
- && (null instsigs)
- && (null defaults)
- && (null iimps))
- binds
- }
-
-sepDeclsIntoSigsAndBinds binding
- = case (sepDeclsForBinds binding) of { sigs_and_binds ->
- foldr sep_stuff ([],[]) sigs_and_binds
- }
- where
- sep_stuff s@(RdrTySig _ _ _ _) (sigs,defs) = (s:sigs,defs)
- sep_stuff s@(RdrSpecValSig _) (sigs,defs) = (s:sigs,defs)
- sep_stuff s@(RdrInlineValSig _) (sigs,defs) = (s:sigs,defs)
- sep_stuff s@(RdrDeforestSig _) (sigs,defs) = (s:sigs,defs)
- sep_stuff s@(RdrMagicUnfoldingSig _) (sigs,defs) = (s:sigs,defs)
- sep_stuff d@(RdrFunctionBinding _ _) (sigs,defs) = (sigs,d:defs)
- sep_stuff d@(RdrPatternBinding _ _) (sigs,defs) = (sigs,d:defs)
-
-
-sepDeclsForInterface binding
- = case (sepDecls binding [] [] [] [] [] [] [] [])
- of { (tys,tysigs,classes,insts,instsigs,defaults,sigs,iimps) ->
- ASSERT ((null defaults)
- && (null tysigs)
- && (null instsigs))
- ASSERT (not (not_all_sigs sigs))
- (tys,classes,insts,sigs,iimps)
- }
+cvOtherDecls :: RdrBinding -> [RdrNameHsDecl]
+cvOtherDecls b
+ = go [] b
where
- not_all_sigs sigs = not (all is_a_sig sigs)
-
- is_a_sig (RdrTySig _ _ _ _) = True
- is_a_sig anything_else = False
+ go acc (RdrAndBindings b1 b2) = go (go acc b1) b2
+ go acc (RdrTyDecl d) = TyD d : acc
+ go acc (RdrClassDecl d) = ClD d : acc
+ go acc (RdrInstDecl d) = InstD d : acc
+ go acc (RdrDefaultDecl d) = DefD d : acc
+ go acc other = acc
+ -- Ignore value bindings
+
+cvForeignDecls :: RdrBinding -> [RdrNameHsDecl]
+cvForeignDecls b = go [] b
+ where
+ go acc (RdrAndBindings b1 b2) = go (go acc b1) b2
+ go acc (RdrForeignDecl d) = ForD d : acc
+ go acc other = acc
+
\end{code}
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