X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FhsSyn%2FConvert.lhs;h=fc724de564709308c78b81842fb9bcd75574f91e;hb=6da2fdc8c83b7f3f400496216f06c9b14ab5efc2;hp=bbe56ade5cd0959807e32ddeb276a6e49a0225de;hpb=dbc254c3dcd64761015a3d1c191ac742caafbf4c;p=ghc-hetmet.git diff --git a/ghc/compiler/hsSyn/Convert.lhs b/ghc/compiler/hsSyn/Convert.lhs index bbe56ad..fc724de 100644 --- a/ghc/compiler/hsSyn/Convert.lhs +++ b/ghc/compiler/hsSyn/Convert.lhs @@ -6,109 +6,205 @@ This module converts Template Haskell syntax into HsSyn \begin{code} -module Convert( convertToHsExpr, convertToHsDecls ) where +module Convert( convertToHsExpr, convertToHsDecls, convertToHsType ) where #include "HsVersions.h" -import Language.Haskell.THSyntax as Meta +import Language.Haskell.TH as TH +import Language.Haskell.TH.Syntax as TH import HsSyn as Hs - ( HsExpr(..), HsLit(..), ArithSeqInfo(..), - HsStmtContext(..), - Match(..), GRHSs(..), GRHS(..), HsPred(..), - HsDecl(..), TyClDecl(..), InstDecl(..), ConDecl(..), - Stmt(..), HsBinds(..), MonoBinds(..), Sig(..), - Pat(..), HsConDetails(..), HsOverLit, BangType(..), - placeHolderType, HsType(..), HsTupCon(..), - HsTyVarBndr(..), HsContext, - mkSimpleMatch - ) - -import RdrName ( RdrName, mkRdrUnqual, mkRdrQual, mkOrig ) -import Module ( mkModuleName ) -import RdrHsSyn ( mkHsIntegral, mkClassDecl, mkTyData ) -import OccName -import SrcLoc ( SrcLoc, generatedSrcLoc ) -import TyCon ( DataConDetails(..) ) +import RdrName ( RdrName, mkRdrUnqual, mkRdrQual, mkOrig, nameRdrName, getRdrName ) +import Module ( ModuleName, mkModuleName ) +import RdrHsSyn ( mkHsIntegral, mkHsFractional, mkClassDecl, mkTyData ) +import Name ( mkInternalName ) +import qualified OccName +import SrcLoc ( SrcLoc, generatedSrcLoc, noLoc, unLoc, Located(..), + noSrcSpan, SrcSpan, srcLocSpan, noSrcLoc ) import Type ( Type ) -import BasicTypes( Boxity(..), RecFlag(Recursive), - NewOrData(..), StrictnessMark(..) ) -import FastString( mkFastString ) -import Char ( ord, isAlphaNum ) +import TysWiredIn ( unitTyCon, tupleTyCon, trueDataCon, falseDataCon ) +import BasicTypes( Boxity(..), RecFlag(Recursive), NewOrData(..) ) +import ForeignCall ( Safety(..), CCallConv(..), CCallTarget(..), + CExportSpec(..)) +import HsDecls ( CImportSpec(..), ForeignImport(..), ForeignExport(..), + ForeignDecl(..) ) +import FastString( FastString, mkFastString, nilFS ) +import Char ( ord, isAscii, isAlphaNum, isAlpha ) import List ( partition ) +import Unique ( Unique, mkUniqueGrimily ) +import ErrUtils (Message) +import GLAEXTS ( Int#, Int(..) ) +import Bag ( emptyBag, consBag ) import Outputable ------------------------------------------------------------------- -convertToHsDecls :: [Meta.Dec] -> [HsDecl RdrName] -convertToHsDecls ds - = ValD (cvtdecs binds_and_sigs) : map cvt_top top_decls +convertToHsDecls :: [TH.Dec] -> [Either (LHsDecl RdrName) Message] +convertToHsDecls ds = map cvt_ltop ds + +mk_con con = L loc0 $ case con of + NormalC c strtys + -> ConDecl (noLoc (cName c)) noExistentials noContext + (PrefixCon (map mk_arg strtys)) + RecC c varstrtys + -> ConDecl (noLoc (cName c)) noExistentials noContext + (RecCon (map mk_id_arg varstrtys)) + InfixC st1 c st2 + -> ConDecl (noLoc (cName c)) noExistentials noContext + (InfixCon (mk_arg st1) (mk_arg st2)) where - (binds_and_sigs, top_decls) = partition sigOrBindP ds - -cvt_top (Data tc tvs constrs derivs) - = TyClD (mkTyData DataType - (noContext, tconName tc, cvt_tvs tvs) - (DataCons (map mk_con constrs)) - (mk_derivs derivs) loc0) - where - mk_con (Constr c tys) - = ConDecl (cName c) noExistentials noContext - (PrefixCon (map mk_arg tys)) loc0 - - mk_arg ty = BangType NotMarkedStrict (cvtType ty) - - mk_derivs [] = Nothing - mk_derivs cs = Just [HsClassP (tconName c) [] | c <- cs] - -cvt_top (Class ctxt cl tvs decs) - = TyClD (mkClassDecl (cvt_context ctxt, tconName cl, cvt_tvs tvs) - noFunDeps - sigs (Just binds) loc0) + mk_arg (IsStrict, ty) = noLoc $ BangType HsStrict (cvtType ty) + mk_arg (NotStrict, ty) = noLoc $ BangType HsNoBang (cvtType ty) + + mk_id_arg (i, IsStrict, ty) + = (noLoc (vName i), noLoc $ BangType HsStrict (cvtType ty)) + mk_id_arg (i, NotStrict, ty) + = (noLoc (vName i), noLoc $ BangType HsNoBang (cvtType ty)) + +mk_derivs [] = Nothing +mk_derivs cs = Just (noLoc [noLoc $ HsClassP (tconName c) [] | c <- cs]) + +cvt_ltop :: TH.Dec -> Either (LHsDecl RdrName) Message +cvt_ltop d = case cvt_top d of + Left d -> Left (L loc0 d) + Right m -> Right m + +cvt_top :: TH.Dec -> Either (HsDecl RdrName) Message +cvt_top d@(TH.ValD _ _ _) = Left $ Hs.ValD (unLoc (cvtd d)) +cvt_top d@(TH.FunD _ _) = Left $ Hs.ValD (unLoc (cvtd d)) + +cvt_top (TySynD tc tvs rhs) + = Left $ TyClD (TySynonym (noLoc (tconName tc)) (cvt_tvs tvs) (cvtType rhs)) + +cvt_top (DataD ctxt tc tvs constrs derivs) + = Left $ TyClD (mkTyData DataType + (cvt_context ctxt, noLoc (tconName tc), cvt_tvs tvs) + (map mk_con constrs) + (mk_derivs derivs)) + +cvt_top (NewtypeD ctxt tc tvs constr derivs) + = Left $ TyClD (mkTyData NewType + (cvt_context ctxt, noLoc (tconName tc), cvt_tvs tvs) + [mk_con constr] + (mk_derivs derivs)) + +cvt_top (ClassD ctxt cl tvs decs) + = Left $ TyClD (mkClassDecl (cvt_context ctxt, noLoc (tconName cl), cvt_tvs tvs) + noFunDeps sigs + binds) where (binds,sigs) = cvtBindsAndSigs decs -cvt_top (Instance tys ty decs) - = InstD (InstDecl inst_ty binds sigs Nothing loc0) +cvt_top (InstanceD tys ty decs) + = Left $ InstD (InstDecl (noLoc inst_ty) binds sigs) where (binds, sigs) = cvtBindsAndSigs decs - inst_ty = HsForAllTy Nothing - (cvt_context tys) - (HsPredTy (cvt_pred ty)) - -noContext = [] + inst_ty = mkImplicitHsForAllTy (cvt_context tys) (noLoc (HsPredTy (cvt_pred ty))) + +cvt_top (TH.SigD nm typ) = Left $ Hs.SigD (Sig (noLoc (vName nm)) (cvtType typ)) + +cvt_top (ForeignD (ImportF callconv safety from nm typ)) + = case parsed of + Just (c_header, cis) -> + let i = CImport callconv' safety' c_header nilFS cis + in Left $ ForD (ForeignImport (noLoc (vName nm)) (cvtType typ) i False) + Nothing -> Right $ text (show from) + <+> ptext SLIT("is not a valid ccall impent") + where callconv' = case callconv of + CCall -> CCallConv + StdCall -> StdCallConv + safety' = case safety of + Unsafe -> PlayRisky + Safe -> PlaySafe False + Threadsafe -> PlaySafe True + parsed = parse_ccall_impent (TH.nameBase nm) from + +cvt_top (ForeignD (ExportF callconv as nm typ)) + = let e = CExport (CExportStatic (mkFastString as) callconv') + in Left $ ForD (ForeignExport (noLoc (vName nm)) (cvtType typ) e False) + where callconv' = case callconv of + CCall -> CCallConv + StdCall -> StdCallConv + +parse_ccall_impent :: String -> String -> Maybe (FastString, CImportSpec) +parse_ccall_impent nm s + = case lex_ccall_impent s of + Just ["dynamic"] -> Just (nilFS, CFunction DynamicTarget) + Just ["wrapper"] -> Just (nilFS, CWrapper) + Just ("static":ts) -> parse_ccall_impent_static nm ts + Just ts -> parse_ccall_impent_static nm ts + Nothing -> Nothing + +parse_ccall_impent_static :: String + -> [String] + -> Maybe (FastString, CImportSpec) +parse_ccall_impent_static nm ts + = let ts' = case ts of + [ "&", cid] -> [ cid] + [fname, "&" ] -> [fname ] + [fname, "&", cid] -> [fname, cid] + _ -> ts + in case ts' of + [ cid] | is_cid cid -> Just (nilFS, mk_cid cid) + [fname, cid] | is_cid cid -> Just (mkFastString fname, mk_cid cid) + [ ] -> Just (nilFS, mk_cid nm) + [fname ] -> Just (mkFastString fname, mk_cid nm) + _ -> Nothing + where is_cid :: String -> Bool + is_cid x = all (/= '.') x && (isAlpha (head x) || head x == '_') + mk_cid :: String -> CImportSpec + mk_cid = CFunction . StaticTarget . mkFastString + +lex_ccall_impent :: String -> Maybe [String] +lex_ccall_impent "" = Just [] +lex_ccall_impent ('&':xs) = fmap ("&":) $ lex_ccall_impent xs +lex_ccall_impent (' ':xs) = lex_ccall_impent xs +lex_ccall_impent ('\t':xs) = lex_ccall_impent xs +lex_ccall_impent xs = case span is_valid xs of + ("", _) -> Nothing + (t, xs') -> fmap (t:) $ lex_ccall_impent xs' + where is_valid :: Char -> Bool + is_valid c = isAscii c && (isAlphaNum c || c `elem` "._") + +noContext = noLoc [] noExistentials = [] noFunDeps = [] ------------------------------------------------------------------- -convertToHsExpr :: Meta.Exp -> HsExpr RdrName -convertToHsExpr = cvt +convertToHsExpr :: TH.Exp -> LHsExpr RdrName +convertToHsExpr = cvtl -cvt (Var s) = HsVar(vName s) -cvt (Con s) = HsVar(cName s) -cvt (Lit l) +cvtl e = noLoc (cvt e) + +cvt (VarE s) = HsVar (vName s) +cvt (ConE s) = HsVar (cName s) +cvt (LitE l) | overloadedLit l = HsOverLit (cvtOverLit l) | otherwise = HsLit (cvtLit l) -cvt (App x y) = HsApp (cvt x) (cvt y) -cvt (Lam ps e) = HsLam (mkSimpleMatch (map cvtp ps) (cvt e) void loc0) -cvt (Tup es) = ExplicitTuple(map cvt es) Boxed -cvt (Cond x y z) = HsIf (cvt x) (cvt y) (cvt z) loc0 -cvt (Let ds e) = HsLet (cvtdecs ds) (cvt e) -cvt (Case e ms) = HsCase (cvt e) (map cvtm ms) loc0 -cvt (Do ss) = HsDo DoExpr (cvtstmts ss) [] void loc0 -cvt (Comp ss) = HsDo ListComp (cvtstmts ss) [] void loc0 -cvt (ArithSeq dd) = ArithSeqIn (cvtdd dd) -cvt (ListExp xs) = ExplicitList void (map cvt xs) -cvt (Infix (Just x) s (Just y)) = OpApp (cvt x) (HsVar(vName s)) undefined (cvt y) -cvt (Infix Nothing s (Just y)) = SectionR (HsVar(vName s)) (cvt y) -cvt (Infix (Just x) s Nothing ) = SectionL (cvt x) (HsVar(vName s)) -cvt (Infix Nothing s Nothing ) = HsVar(vName s) -- Can I indicate this is an infix thing? - - -cvtdecs :: [Meta.Dec] -> HsBinds RdrName -cvtdecs [] = EmptyBinds -cvtdecs ds = MonoBind binds sigs Recursive +cvt (AppE x y) = HsApp (cvtl x) (cvtl y) +cvt (LamE ps e) = HsLam (mkSimpleMatch (map cvtlp ps) (cvtl e) void) +cvt (TupE [e]) = cvt e +cvt (TupE es) = ExplicitTuple(map cvtl es) Boxed +cvt (CondE x y z) = HsIf (cvtl x) (cvtl y) (cvtl z) +cvt (LetE ds e) = HsLet (cvtdecs ds) (cvtl e) +cvt (CaseE e ms) = HsCase (cvtl e) (map cvtm ms) +cvt (DoE ss) = HsDo DoExpr (cvtstmts ss) [] void +cvt (CompE ss) = HsDo ListComp (cvtstmts ss) [] void +cvt (ArithSeqE dd) = ArithSeqIn (cvtdd dd) +cvt (ListE xs) = ExplicitList void (map cvtl xs) +cvt (InfixE (Just x) s (Just y)) + = HsPar (noLoc $ OpApp (cvtl x) (cvtl s) undefined (cvtl y)) +cvt (InfixE Nothing s (Just y)) = SectionR (cvtl s) (cvtl y) +cvt (InfixE (Just x) s Nothing ) = SectionL (cvtl x) (cvtl s) +cvt (InfixE Nothing s Nothing ) = cvt s -- Can I indicate this is an infix thing? +cvt (SigE e t) = ExprWithTySig (cvtl e) (cvtType t) +cvt (RecConE c flds) = RecordCon (noLoc (cName c)) (map (\(x,y) -> (noLoc (vName x), cvtl y)) flds) +cvt (RecUpdE e flds) = RecordUpd (cvtl e) (map (\(x,y) -> (noLoc (vName x), cvtl y)) flds) + +cvtdecs :: [TH.Dec] -> [HsBindGroup RdrName] +cvtdecs [] = [] +cvtdecs ds = [HsBindGroup binds sigs Recursive] where (binds, sigs) = cvtBindsAndSigs ds @@ -117,181 +213,199 @@ cvtBindsAndSigs ds where (sigs, non_sigs) = partition sigP ds -cvtSig (Proto nm typ) = Sig (vName nm) (cvtType typ) loc0 +cvtSig (TH.SigD nm typ) = noLoc (Hs.Sig (noLoc (vName nm)) (cvtType typ)) -cvtds :: [Meta.Dec] -> MonoBinds RdrName -cvtds [] = EmptyMonoBinds -cvtds (d:ds) = AndMonoBinds (cvtd d) (cvtds ds) +cvtds :: [TH.Dec] -> LHsBinds RdrName +cvtds [] = emptyBag +cvtds (d:ds) = cvtd d `consBag` cvtds ds -cvtd :: Meta.Dec -> MonoBinds RdrName +cvtd :: TH.Dec -> LHsBind RdrName -- Used only for declarations in a 'let/where' clause, -- not for top level decls -cvtd (Val (Pvar s) body ds) = FunMonoBind (vName s) False - (panic "what now?") loc0 -cvtd (Fun nm cls) = FunMonoBind (vName nm) False (map cvtclause cls) loc0 -cvtd (Val p body ds) = PatMonoBind (cvtp p) (GRHSs (cvtguard body) - (cvtdecs ds) - void) loc0 -cvtd x = panic "Illegal kind of declaration in where clause" +cvtd (TH.ValD (TH.VarP s) body ds) + = noLoc $ FunBind (noLoc (vName s)) False [cvtclause (Clause [] body ds)] +cvtd (FunD nm cls) + = noLoc $ FunBind (noLoc (vName nm)) False (map cvtclause cls) +cvtd (TH.ValD p body ds) + = noLoc $ PatBind (cvtlp p) (GRHSs (cvtguard body) (cvtdecs ds) void) + +cvtd d = cvtPanic "Illegal kind of declaration in where clause" + (text (show (TH.pprDec d))) -cvtclause :: Meta.Clause (Meta.Pat) (Meta.Exp) (Meta.Dec) -> Hs.Match RdrName -cvtclause (ps,body,wheres) = Match (map cvtp ps) Nothing - (GRHSs (cvtguard body) (cvtdecs wheres) void) +cvtclause :: TH.Clause -> Hs.LMatch RdrName +cvtclause (Clause ps body wheres) + = noLoc $ Hs.Match (map cvtlp ps) Nothing (GRHSs (cvtguard body) (cvtdecs wheres) void) -cvtdd :: Meta.DDt -> ArithSeqInfo RdrName -cvtdd (Meta.From x) = (Hs.From (cvt x)) -cvtdd (Meta.FromThen x y) = (Hs.FromThen (cvt x) (cvt y)) -cvtdd (Meta.FromTo x y) = (Hs.FromTo (cvt x) (cvt y)) -cvtdd (Meta.FromThenTo x y z) = (Hs.FromThenTo (cvt x) (cvt y) (cvt z)) +cvtdd :: Range -> ArithSeqInfo RdrName +cvtdd (FromR x) = (From (cvtl x)) +cvtdd (FromThenR x y) = (FromThen (cvtl x) (cvtl y)) +cvtdd (FromToR x y) = (FromTo (cvtl x) (cvtl y)) +cvtdd (FromThenToR x y z) = (FromThenTo (cvtl x) (cvtl y) (cvtl z)) -cvtstmts :: [Meta.Stm] -> [Hs.Stmt RdrName] -cvtstmts [] = [] -- this is probably an error as every [stmt] should end with ResultStmt -cvtstmts [NoBindSt e] = [ResultStmt (cvt e) loc0] -- when its the last element use ResultStmt -cvtstmts (NoBindSt e : ss) = ExprStmt (cvt e) void loc0 : cvtstmts ss -cvtstmts (BindSt p e : ss) = BindStmt (cvtp p) (cvt e) loc0 : cvtstmts ss -cvtstmts (LetSt ds : ss) = LetStmt (cvtdecs ds) : cvtstmts ss -cvtstmts (ParSt dss : ss) = ParStmt(map cvtstmts dss) : cvtstmts ss +cvtstmts :: [TH.Stmt] -> [Hs.LStmt RdrName] +cvtstmts [] = [] -- this is probably an error as every [stmt] should end with ResultStmt +cvtstmts [NoBindS e] = [nlResultStmt (cvtl e)] -- when its the last element use ResultStmt +cvtstmts (NoBindS e : ss) = nlExprStmt (cvtl e) : cvtstmts ss +cvtstmts (TH.BindS p e : ss) = nlBindStmt (cvtlp p) (cvtl e) : cvtstmts ss +cvtstmts (TH.LetS ds : ss) = nlLetStmt (cvtdecs ds) : cvtstmts ss +cvtstmts (TH.ParS dss : ss) = nlParStmt [(cvtstmts ds, undefined) | ds <- dss] : cvtstmts ss +cvtm :: TH.Match -> Hs.LMatch RdrName +cvtm (TH.Match p body wheres) + = noLoc (Hs.Match [cvtlp p] Nothing (GRHSs (cvtguard body) (cvtdecs wheres) void)) -cvtm :: Meta.Mat -> Hs.Match RdrName -cvtm (p,body,wheres) = Match [cvtp p] Nothing - (GRHSs (cvtguard body) (cvtdecs wheres) void) - -cvtguard :: Meta.Rhs -> [GRHS RdrName] -cvtguard (Guarded pairs) = map cvtpair pairs -cvtguard (Normal e) = [GRHS [ ResultStmt (cvt e) loc0 ] loc0] +cvtguard :: TH.Body -> [LGRHS RdrName] +cvtguard (GuardedB pairs) = map cvtpair pairs +cvtguard (NormalB e) = [noLoc (GRHS [ nlResultStmt (cvtl e) ])] -cvtpair :: (Meta.Exp,Meta.Exp) -> GRHS RdrName -cvtpair (x,y) = GRHS [BindStmt truePat (cvt x) loc0, - ResultStmt (cvt y) loc0] loc0 +cvtpair :: (TH.Exp,TH.Exp) -> LGRHS RdrName +cvtpair (x,y) = noLoc (GRHS [nlBindStmt truePat (cvtl x), + nlResultStmt (cvtl y)]) cvtOverLit :: Lit -> HsOverLit -cvtOverLit (Int i) = mkHsIntegral (fromInt i) --- An Int is like an an (overloaded) '3' in a Haskell source program +cvtOverLit (IntegerL i) = mkHsIntegral i +cvtOverLit (RationalL r) = mkHsFractional r +-- An Integer is like an an (overloaded) '3' in a Haskell source program +-- Similarly 3.5 for fractionals cvtLit :: Lit -> HsLit -cvtLit (Char c) = HsChar (ord c) -cvtLit (CrossStage s) = error "What do we do about crossStage constants?" +cvtLit (IntPrimL i) = HsIntPrim i +cvtLit (FloatPrimL f) = HsFloatPrim f +cvtLit (DoublePrimL f) = HsDoublePrim f +cvtLit (CharL c) = HsChar c +cvtLit (StringL s) = HsString (mkFastString s) + +cvtlp :: TH.Pat -> Hs.LPat RdrName +cvtlp pat = noLoc (cvtp pat) -cvtp :: Meta.Pat -> Hs.Pat RdrName -cvtp (Plit l) +cvtp :: TH.Pat -> Hs.Pat RdrName +cvtp (TH.LitP l) | overloadedLit l = NPatIn (cvtOverLit l) Nothing -- Not right for negative -- patterns; need to think -- about that! - | otherwise = LitPat (cvtLit l) -cvtp (Pvar s) = VarPat(vName s) -cvtp (Ptup ps) = TuplePat (map cvtp ps) Boxed -cvtp (Pcon s ps) = ConPatIn (cName s) (PrefixCon (map cvtp ps)) -cvtp (Ptilde p) = LazyPat (cvtp p) -cvtp (Paspat s p) = AsPat (vName s) (cvtp p) -cvtp Pwild = WildPat void + | otherwise = Hs.LitPat (cvtLit l) +cvtp (TH.VarP s) = Hs.VarPat(vName s) +cvtp (TupP [p]) = cvtp p +cvtp (TupP ps) = TuplePat (map cvtlp ps) Boxed +cvtp (ConP s ps) = ConPatIn (noLoc (cName s)) (PrefixCon (map cvtlp ps)) +cvtp (TildeP p) = LazyPat (cvtlp p) +cvtp (TH.AsP s p) = AsPat (noLoc (vName s)) (cvtlp p) +cvtp TH.WildP = WildPat void +cvtp (RecP c fs) = ConPatIn (noLoc (cName c)) $ Hs.RecCon (map (\(s,p) -> (noLoc (vName s),cvtlp p)) fs) +cvtp (ListP ps) = ListPat (map cvtlp ps) void ----------------------------------------------------------- -- Types and type variables -cvt_tvs :: [String] -> [HsTyVarBndr RdrName] -cvt_tvs tvs = map (UserTyVar . tName) tvs +cvt_tvs :: [TH.Name] -> [LHsTyVarBndr RdrName] +cvt_tvs tvs = map (noLoc . UserTyVar . tName) tvs -cvt_context :: Context -> HsContext RdrName -cvt_context tys = map cvt_pred tys +cvt_context :: Cxt -> LHsContext RdrName +cvt_context tys = noLoc (map cvt_pred tys) -cvt_pred :: Typ -> HsPred RdrName +cvt_pred :: TH.Type -> LHsPred RdrName cvt_pred ty = case split_ty_app ty of - (Tvar tc, tys) -> HsClassP (tconName tc) (map cvtType tys) - other -> panic "Malformed predicate" - -cvtType :: Meta.Typ -> HsType RdrName -cvtType (Tvar nm) = HsTyVar(tName nm) -cvtType (Tapp x y) = trans (root x [y]) - where root (Tapp a b) zs = root a (b:zs) - root t zs = (t,zs) - trans (Tcon (Tuple n),args) = HsTupleTy (HsTupCon Boxed n) (map cvtType args) - trans (Tcon Arrow,[x,y]) = HsFunTy (cvtType x) (cvtType y) - trans (Tcon List,[x]) = HsListTy (cvtType x) - trans (Tcon (Name nm),args) = HsTyVar(tconName nm) - trans (t,args) = panic "bad type application" - -split_ty_app :: Typ -> (Typ, [Typ]) + (ConT tc, tys) -> noLoc (HsClassP (tconName tc) (map cvtType tys)) + (VarT tv, tys) -> noLoc (HsClassP (tName tv) (map cvtType tys)) + other -> cvtPanic "Malformed predicate" (text (show (TH.pprType ty))) + +convertToHsType = cvtType + +cvtType :: TH.Type -> LHsType RdrName +cvtType ty = trans (root ty []) + where root (AppT a b) zs = root a (cvtType b : zs) + root t zs = (t,zs) + + trans (TupleT n,args) + | length args == n = noLoc (HsTupleTy Boxed args) + | n == 0 = foldl nlHsAppTy (nlHsTyVar (getRdrName unitTyCon)) args + | otherwise = foldl nlHsAppTy (nlHsTyVar (getRdrName (tupleTyCon Boxed n))) args + trans (ArrowT, [x,y]) = nlHsFunTy x y + trans (ListT, [x]) = noLoc (HsListTy x) + + trans (VarT nm, args) = foldl nlHsAppTy (nlHsTyVar (tName nm)) args + trans (ConT tc, args) = foldl nlHsAppTy (nlHsTyVar (tconName tc)) args + + trans (ForallT tvs cxt ty, []) = noLoc $ mkExplicitHsForAllTy + (cvt_tvs tvs) (cvt_context cxt) (cvtType ty) + +split_ty_app :: TH.Type -> (TH.Type, [TH.Type]) split_ty_app ty = go ty [] where - go (Tapp f a) as = go f (a:as) + go (AppT f a) as = go f (a:as) go f as = (f,as) ----------------------------------------------------------- sigP :: Dec -> Bool -sigP (Proto _ _) = True +sigP (TH.SigD _ _) = True sigP other = False -sigOrBindP :: Dec -> Bool -sigOrBindP (Proto _ _) = True -sigOrBindP (Val _ _ _) = True -sigOrBindP (Fun _ _) = True -sigOrBindP other = False +----------------------------------------------------------- +cvtPanic :: String -> SDoc -> b +cvtPanic herald thing + = pprPanic herald (thing $$ ptext SLIT("When splicing generated code into the program")) ----------------------------------------------------------- -- some useful things -truePat = ConPatIn (cName "True") (PrefixCon []) -falsePat = ConPatIn (cName "False") (PrefixCon []) +truePat = nlConPat (getRdrName trueDataCon) [] +falsePat = nlConPat (getRdrName falseDataCon) [] overloadedLit :: Lit -> Bool -- True for literals that Haskell treats as overloaded -overloadedLit (Int l) = True -overloadedLit l = False +overloadedLit (IntegerL l) = True +overloadedLit (RationalL l) = True +overloadedLit l = False void :: Type.Type void = placeHolderType -loc0 :: SrcLoc -loc0 = generatedSrcLoc +loc0 :: SrcSpan +loc0 = srcLocSpan generatedSrcLoc -fromInt :: Int -> Integer -fromInt x = toInteger x +-------------------------------------------------------------------- +-- Turning Name back into RdrName +-------------------------------------------------------------------- -- variable names -vName :: String -> RdrName -vName = mkName varName +vName :: TH.Name -> RdrName +vName = thRdrName OccName.varName --- Constructor function names -cName :: String -> RdrName -cName = mkName dataName +-- Constructor function names; this is Haskell source, hence srcDataName +cName :: TH.Name -> RdrName +cName = thRdrName OccName.srcDataName -- Type variable names -tName :: String -> RdrName -tName = mkName tvName +tName :: TH.Name -> RdrName +tName = thRdrName OccName.tvName -- Type Constructor names -tconName = mkName tcName +tconName = thRdrName OccName.tcName -mkName :: NameSpace -> String -> RdrName --- Parse the string to see if it has a "." or ":" in it --- so we know whether to generate a qualified or original name --- It's a bit tricky because we need to parse --- Foo.Baz.x as Qual Foo.Baz x --- So we parse it from back to front +thRdrName :: OccName.NameSpace -> TH.Name -> RdrName +-- This turns a Name into a RdrName +-- The last case is slightly interesting. It constructs a +-- unique name from the unique in the TH thingy, so that the renamer +-- won't mess about. I hope. (Another possiblity would be to generate +-- "x_77" etc, but that could conceivably clash.) -mkName ns str - = split [] (reverse str) - where - split occ [] = mkRdrUnqual (mk_occ occ) - split occ (c:d:rev) -- 'd' is the last char before the separator - | is_sep c -- E.g. Fo.x d='o' - && isAlphaNum d -- Fo.+: d='+' perhaps - = mk_qual (reverse (d:rev)) c occ - split occ (c:rev) = split (c:occ) rev - - mk_qual mod '.' occ = mkRdrQual (mk_mod mod) (mk_occ occ) - mk_qual mod ':' occ = mkOrig (mk_mod mod) (mk_occ occ) - - mk_occ occ = mkOccFS ns (mkFastString occ) - mk_mod mod = mkModuleName mod - - is_sep '.' = True - is_sep ':' = True - is_sep other = False +thRdrName ns (TH.Name occ (TH.NameG ns' mod)) = mkOrig (mk_mod mod) (mk_occ ns occ) +thRdrName ns (TH.Name occ TH.NameS) = mkRdrUnqual (mk_occ ns occ) +thRdrName ns (TH.Name occ (TH.NameU uniq)) = nameRdrName (mkInternalName (mk_uniq uniq) (mk_occ ns occ) noSrcLoc) + +mk_uniq :: Int# -> Unique +mk_uniq u = mkUniqueGrimily (I# u) + +-- The packing and unpacking is rather turgid :-( +mk_occ :: OccName.NameSpace -> TH.OccName -> OccName.OccName +mk_occ ns occ = OccName.mkOccFS ns (mkFastString (TH.occString occ)) + +mk_mod :: TH.ModName -> ModuleName +mk_mod mod = mkModuleName (TH.modString mod) \end{code} +