\begin{code}
-module Convert( convertToHsExpr, convertToHsDecls, convertToHsType ) where
+module Convert( convertToHsExpr, convertToHsDecls, convertToHsType, thRdrName ) where
#include "HsVersions.h"
-import Language.Haskell.TH as TH
+import Language.Haskell.TH as TH hiding (sigP)
import Language.Haskell.TH.Syntax as TH
import HsSyn as Hs
-import RdrName ( RdrName, mkRdrUnqual, mkRdrQual, mkOrig, nameRdrName, getRdrName )
-import Module ( ModuleName, mkModuleName )
-import RdrHsSyn ( mkHsIntegral, mkHsFractional, mkClassDecl, mkTyData )
-import Name ( mkInternalName )
+import qualified Class (FunDep)
+import RdrName ( RdrName, mkRdrUnqual, mkRdrQual, mkOrig, getRdrName, nameRdrName )
+import qualified Name ( Name, mkInternalName, getName )
+import Module ( Module, mkModule )
+import RdrHsSyn ( mkClassDecl, mkTyData )
import qualified OccName
-import SrcLoc ( SrcLoc, generatedSrcLoc, noLoc, unLoc, Located(..),
- noSrcSpan, SrcSpan, srcLocSpan, noSrcLoc )
+import OccName ( startsVarId, startsVarSym, startsConId, startsConSym,
+ pprNameSpace )
+import SrcLoc ( Located(..), SrcSpan )
import Type ( Type )
-import TysWiredIn ( unitTyCon, tupleTyCon, trueDataCon, falseDataCon )
-import BasicTypes( Boxity(..), RecFlag(Recursive) )
+import TysWiredIn ( unitTyCon, tupleTyCon, tupleCon, trueDataCon, nilDataCon, consDataCon )
+import BasicTypes( Boxity(..) )
import ForeignCall ( Safety(..), CCallConv(..), CCallTarget(..),
CExportSpec(..))
-import HsDecls ( CImportSpec(..), ForeignImport(..), ForeignExport(..),
- ForeignDecl(..) )
-import FastString( FastString, mkFastString, nilFS )
-import Char ( ord, isAscii, isAlphaNum, isAlpha )
+import Char ( isAscii, isAlphaNum, isAlpha )
import List ( partition )
import Unique ( Unique, mkUniqueGrimily )
-import ErrUtils (Message)
-import GLAEXTS ( Int#, Int(..) )
-import Bag ( emptyBag, consBag )
+import ErrUtils ( Message )
+import GLAEXTS ( Int(..), Int# )
+import SrcLoc ( noSrcLoc )
+import Bag ( listToBag )
+import FastString
import Outputable
+
-------------------------------------------------------------------
-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
- 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 $ HsPredTy $ 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
+-- The external interface
-cvt_top (InstanceD tys ty decs)
- = Left $ InstD (InstDecl (noLoc inst_ty) binds sigs)
- where
- (binds, sigs) = cvtBindsAndSigs decs
- 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
+convertToHsDecls :: SrcSpan -> [TH.Dec] -> Either Message [LHsDecl RdrName]
+convertToHsDecls loc ds = initCvt loc (mapM cvtTop ds)
+
+convertToHsExpr :: SrcSpan -> TH.Exp -> Either Message (LHsExpr RdrName)
+convertToHsExpr loc e = initCvt loc (cvtl e)
+
+convertToHsType :: SrcSpan -> TH.Type -> Either Message (LHsType RdrName)
+convertToHsType loc t = initCvt loc (cvtType t)
+
+
+-------------------------------------------------------------------
+newtype CvtM a = CvtM { unCvtM :: SrcSpan -> Either Message a }
+ -- Push down the source location;
+ -- Can fail, with a single error message
+
+-- NB: If the conversion succeeds with (Right x), there should
+-- be no exception values hiding in x
+-- Reason: so a (head []) in TH code doesn't subsequently
+-- make GHC crash when it tries to walk the generated tree
+
+-- Use the loc everywhere, for lack of anything better
+-- In particular, we want it on binding locations, so that variables bound in
+-- the spliced-in declarations get a location that at least relates to the splice point
+
+instance Monad CvtM where
+ return x = CvtM $ \loc -> Right x
+ (CvtM m) >>= k = CvtM $ \loc -> case m loc of
+ Left err -> Left err
+ Right v -> unCvtM (k v) loc
+
+initCvt :: SrcSpan -> CvtM a -> Either Message a
+initCvt loc (CvtM m) = m loc
+
+force :: a -> CvtM a
+force a = a `seq` return a
+
+failWith :: Message -> CvtM a
+failWith m = CvtM (\loc -> Left full_msg)
+ where
+ full_msg = m $$ ptext SLIT("When splicing generated code into the program")
+
+returnL :: a -> CvtM (Located a)
+returnL x = CvtM (\loc -> Right (L loc x))
+
+wrapL :: CvtM a -> CvtM (Located a)
+wrapL (CvtM m) = CvtM (\loc -> case m loc of
+ Left err -> Left err
+ Right v -> Right (L loc v))
+
+-------------------------------------------------------------------
+cvtTop :: TH.Dec -> CvtM (LHsDecl RdrName)
+cvtTop d@(TH.ValD _ _ _) = do { L loc d' <- cvtBind d; return (L loc $ Hs.ValD d') }
+cvtTop d@(TH.FunD _ _) = do { L loc d' <- cvtBind d; return (L loc $ Hs.ValD d') }
+cvtTop (TH.SigD nm typ) = do { nm' <- vNameL nm
+ ; ty' <- cvtType typ
+ ; returnL $ Hs.SigD (TypeSig nm' ty') }
+
+cvtTop (TySynD tc tvs rhs)
+ = do { tc' <- tconNameL tc
+ ; tvs' <- cvtTvs tvs
+ ; rhs' <- cvtType rhs
+ ; returnL $ TyClD (TySynonym tc' tvs' rhs') }
+
+cvtTop (DataD ctxt tc tvs constrs derivs)
+ = do { stuff <- cvt_tycl_hdr ctxt tc tvs
+ ; cons' <- mapM cvtConstr constrs
+ ; derivs' <- cvtDerivs derivs
+ ; returnL $ TyClD (mkTyData DataType stuff Nothing cons' derivs') }
+
+
+cvtTop (NewtypeD ctxt tc tvs constr derivs)
+ = do { stuff <- cvt_tycl_hdr ctxt tc tvs
+ ; con' <- cvtConstr constr
+ ; derivs' <- cvtDerivs derivs
+ ; returnL $ TyClD (mkTyData NewType stuff Nothing [con'] derivs') }
+
+cvtTop (ClassD ctxt cl tvs fds decs)
+ = do { stuff <- cvt_tycl_hdr ctxt cl tvs
+ ; fds' <- mapM cvt_fundep fds
+ ; (binds', sigs') <- cvtBindsAndSigs decs
+ ; returnL $ TyClD $ mkClassDecl stuff fds' sigs' binds' }
+
+cvtTop (InstanceD tys ty decs)
+ = do { (binds', sigs') <- cvtBindsAndSigs decs
+ ; ctxt' <- cvtContext tys
+ ; L loc pred' <- cvtPred ty
+ ; inst_ty' <- returnL $ mkImplicitHsForAllTy ctxt' (L loc (HsPredTy pred'))
+ ; returnL $ InstD (InstDecl inst_ty' binds' sigs') }
+
+cvtTop (ForeignD ford) = do { ford' <- cvtForD ford; returnL $ ForD ford' }
+
+cvt_tycl_hdr cxt tc tvs
+ = do { cxt' <- cvtContext cxt
+ ; tc' <- tconNameL tc
+ ; tvs' <- cvtTvs tvs
+ ; return (cxt', tc', tvs') }
+
+---------------------------------------------------
+-- Data types
+-- Can't handle GADTs yet
+---------------------------------------------------
+
+cvtConstr (NormalC c strtys)
+ = do { c' <- cNameL c
+ ; cxt' <- returnL []
+ ; tys' <- mapM cvt_arg strtys
+ ; returnL $ ConDecl c' Explicit noExistentials cxt' (PrefixCon tys') ResTyH98 }
+
+cvtConstr (RecC c varstrtys)
+ = do { c' <- cNameL c
+ ; cxt' <- returnL []
+ ; args' <- mapM cvt_id_arg varstrtys
+ ; returnL $ ConDecl c' Explicit noExistentials cxt' (RecCon args') ResTyH98 }
+
+cvtConstr (InfixC st1 c st2)
+ = do { c' <- cNameL c
+ ; cxt' <- returnL []
+ ; st1' <- cvt_arg st1
+ ; st2' <- cvt_arg st2
+ ; returnL $ ConDecl c' Explicit noExistentials cxt' (InfixCon st1' st2') ResTyH98 }
+
+cvtConstr (ForallC tvs ctxt (ForallC tvs' ctxt' con'))
+ = cvtConstr (ForallC (tvs ++ tvs') (ctxt ++ ctxt') con')
+
+cvtConstr (ForallC tvs ctxt con)
+ = do { L _ con' <- cvtConstr con
+ ; tvs' <- cvtTvs tvs
+ ; ctxt' <- cvtContext ctxt
+ ; case con' of
+ ConDecl l _ [] (L _ []) x ResTyH98
+ -> returnL $ ConDecl l Explicit tvs' ctxt' x ResTyH98
+ c -> panic "ForallC: Can't happen" }
+
+cvt_arg (IsStrict, ty) = do { ty' <- cvtType ty; returnL $ HsBangTy HsStrict ty' }
+cvt_arg (NotStrict, ty) = cvtType ty
+
+cvt_id_arg (i, str, ty) = do { i' <- vNameL i
+ ; ty' <- cvt_arg (str,ty)
+ ; return (i', ty') }
+
+cvtDerivs [] = return Nothing
+cvtDerivs cs = do { cs' <- mapM cvt_one cs
+ ; return (Just cs') }
+ where
+ cvt_one c = do { c' <- tconName c
+ ; returnL $ HsPredTy $ HsClassP c' [] }
+
+cvt_fundep :: FunDep -> CvtM (Located (Class.FunDep RdrName))
+cvt_fundep (FunDep xs ys) = do { xs' <- mapM tName xs; ys' <- mapM tName ys; returnL (xs', ys') }
+
+noExistentials = []
+
+------------------------------------------
+-- Foreign declarations
+------------------------------------------
+
+cvtForD :: Foreign -> CvtM (ForeignDecl RdrName)
+cvtForD (ImportF callconv safety from nm ty)
+ | Just (c_header, cis) <- parse_ccall_impent (TH.nameBase nm) from
+ = do { nm' <- vNameL nm
+ ; ty' <- cvtType ty
+ ; let i = CImport (cvt_conv callconv) safety' c_header nilFS cis
+ ; return $ ForeignImport nm' ty' i False }
+
+ | otherwise
+ = failWith $ text (show from)<+> ptext SLIT("is not a valid ccall impent")
+ where
+ safety' = case safety of
+ Unsafe -> PlayRisky
+ Safe -> PlaySafe False
+ Threadsafe -> PlaySafe True
+
+cvtForD (ExportF callconv as nm ty)
+ = do { nm' <- vNameL nm
+ ; ty' <- cvtType ty
+ ; let e = CExport (CExportStatic (mkFastString as) (cvt_conv callconv))
+ ; return $ ForeignExport nm' ty' e False }
+
+cvt_conv CCall = CCallConv
+cvt_conv StdCall = StdCallConv
parse_ccall_impent :: String -> String -> Maybe (FastString, CImportSpec)
parse_ccall_impent nm s
where is_valid :: Char -> Bool
is_valid c = isAscii c && (isAlphaNum c || c `elem` "._")
-noContext = noLoc []
-noExistentials = []
-noFunDeps = []
--------------------------------------------------------------------
-convertToHsExpr :: TH.Exp -> LHsExpr RdrName
-convertToHsExpr = cvtl
-
-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 (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
+---------------------------------------------------
+-- Declarations
+---------------------------------------------------
+
+cvtDecs :: [TH.Dec] -> CvtM (HsLocalBinds RdrName)
+cvtDecs [] = return EmptyLocalBinds
+cvtDecs ds = do { (binds,sigs) <- cvtBindsAndSigs ds
+ ; return (HsValBinds (ValBindsIn binds sigs)) }
cvtBindsAndSigs ds
- = (cvtds non_sigs, map cvtSig sigs)
+ = do { binds' <- mapM cvtBind binds; sigs' <- mapM cvtSig sigs
+ ; return (listToBag binds', sigs') }
where
- (sigs, non_sigs) = partition sigP ds
+ (sigs, binds) = partition is_sig ds
-cvtSig (TH.SigD nm typ) = noLoc (Hs.Sig (noLoc (vName nm)) (cvtType typ))
+ is_sig (TH.SigD _ _) = True
+ is_sig other = False
-cvtds :: [TH.Dec] -> LHsBinds RdrName
-cvtds [] = emptyBag
-cvtds (d:ds) = cvtd d `consBag` cvtds ds
+cvtSig (TH.SigD nm ty)
+ = do { nm' <- vNameL nm; ty' <- cvtType ty; returnL (Hs.TypeSig nm' ty') }
-cvtd :: TH.Dec -> LHsBind RdrName
+cvtBind :: TH.Dec -> CvtM (LHsBind RdrName)
-- Used only for declarations in a 'let/where' clause,
-- not for top level decls
-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 (TH.pprint d))
-
-
-cvtclause :: TH.Clause -> Hs.LMatch RdrName
-cvtclause (Clause ps body wheres)
- = noLoc $ Hs.Match (map cvtlp ps) Nothing (GRHSs (cvtguard body) (cvtdecs wheres) void)
+cvtBind (TH.ValD (TH.VarP s) body ds)
+ = do { s' <- vNameL s
+ ; cl' <- cvtClause (Clause [] body ds)
+ ; returnL $ mkFunBind s' [cl'] }
+
+cvtBind (TH.FunD nm cls)
+ = do { nm' <- vNameL nm
+ ; cls' <- mapM cvtClause cls
+ ; returnL $ mkFunBind nm' cls' }
+
+cvtBind (TH.ValD p body ds)
+ = do { p' <- cvtPat p
+ ; g' <- cvtGuard body
+ ; ds' <- cvtDecs ds
+ ; returnL $ PatBind { pat_lhs = p', pat_rhs = GRHSs g' ds',
+ pat_rhs_ty = void, bind_fvs = placeHolderNames } }
+
+cvtBind d
+ = failWith (sep [ptext SLIT("Illegal kind of declaration in where clause"),
+ nest 2 (text (TH.pprint d))])
+
+cvtClause :: TH.Clause -> CvtM (Hs.LMatch RdrName)
+cvtClause (Clause ps body wheres)
+ = do { ps' <- cvtPats ps
+ ; g' <- cvtGuard body
+ ; ds' <- cvtDecs wheres
+ ; returnL $ Hs.Match ps' Nothing (GRHSs g' ds') }
+-------------------------------------------------------------------
+-- Expressions
+-------------------------------------------------------------------
-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 :: [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))
-
-cvtguard :: TH.Body -> [LGRHS RdrName]
-cvtguard (GuardedB pairs) = map cvtpair pairs
-cvtguard (NormalB e) = [noLoc (GRHS [ nlResultStmt (cvtl e) ])]
-
-cvtpair :: (TH.Exp,TH.Exp) -> LGRHS RdrName
-cvtpair (x,y) = noLoc (GRHS [nlBindStmt truePat (cvtl x),
- nlResultStmt (cvtl y)])
-
-cvtOverLit :: Lit -> HsOverLit
-cvtOverLit (IntegerL i) = mkHsIntegral i
-cvtOverLit (RationalL r) = mkHsFractional r
+cvtl :: TH.Exp -> CvtM (LHsExpr RdrName)
+cvtl e = wrapL (cvt e)
+ where
+ cvt (VarE s) = do { s' <- vName s; return $ HsVar s' }
+ cvt (ConE s) = do { s' <- cName s; return $ HsVar s' }
+ cvt (LitE l)
+ | overloadedLit l = do { l' <- cvtOverLit l; return $ HsOverLit l' }
+ | otherwise = do { l' <- cvtLit l; return $ HsLit l' }
+
+ cvt (AppE x y) = do { x' <- cvtl x; y' <- cvtl y; return $ HsApp x' y' }
+ cvt (LamE ps e) = do { ps' <- cvtPats ps; e' <- cvtl e
+ ; return $ HsLam (mkMatchGroup [mkSimpleMatch ps' e']) }
+ cvt (TupE [e]) = cvt e
+ cvt (TupE es) = do { es' <- mapM cvtl es; return $ ExplicitTuple es' Boxed }
+ cvt (CondE x y z) = do { x' <- cvtl x; y' <- cvtl y; z' <- cvtl z
+ ; return $ HsIf x' y' z' }
+ cvt (LetE ds e) = do { ds' <- cvtDecs ds; e' <- cvtl e; return $ HsLet ds' e' }
+ cvt (CaseE e ms) = do { e' <- cvtl e; ms' <- mapM cvtMatch ms
+ ; return $ HsCase e' (mkMatchGroup ms') }
+ cvt (DoE ss) = cvtHsDo DoExpr ss
+ cvt (CompE ss) = cvtHsDo ListComp ss
+ cvt (ArithSeqE dd) = do { dd' <- cvtDD dd; return $ ArithSeq noPostTcExpr dd' }
+ cvt (ListE xs) = do { xs' <- mapM cvtl xs; return $ ExplicitList void xs' }
+ cvt (InfixE (Just x) s (Just y)) = do { x' <- cvtl x; s' <- cvtl s; y' <- cvtl y
+ ; e' <- returnL $ OpApp x' s' undefined y'
+ ; return $ HsPar e' }
+ cvt (InfixE Nothing s (Just y)) = do { s' <- cvtl s; y' <- cvtl y
+ ; return $ SectionR s' y' }
+ cvt (InfixE (Just x) s Nothing ) = do { x' <- cvtl x; s' <- cvtl s
+ ; return $ SectionL x' s' }
+ cvt (InfixE Nothing s Nothing ) = cvt s -- Can I indicate this is an infix thing?
+
+ cvt (SigE e t) = do { e' <- cvtl e; t' <- cvtType t
+ ; return $ ExprWithTySig e' t' }
+ cvt (RecConE c flds) = do { c' <- cNameL c
+ ; flds' <- mapM cvtFld flds
+ ; return $ RecordCon c' noPostTcExpr flds' }
+ cvt (RecUpdE e flds) = do { e' <- cvtl e
+ ; flds' <- mapM cvtFld flds
+ ; return $ RecordUpd e' flds' placeHolderType placeHolderType }
+
+cvtFld (v,e) = do { v' <- vNameL v; e' <- cvtl e; return (v',e') }
+
+cvtDD :: Range -> CvtM (ArithSeqInfo RdrName)
+cvtDD (FromR x) = do { x' <- cvtl x; return $ From x' }
+cvtDD (FromThenR x y) = do { x' <- cvtl x; y' <- cvtl y; return $ FromThen x' y' }
+cvtDD (FromToR x y) = do { x' <- cvtl x; y' <- cvtl y; return $ FromTo x' y' }
+cvtDD (FromThenToR x y z) = do { x' <- cvtl x; y' <- cvtl y; z' <- cvtl z; return $ FromThenTo x' y' z' }
+
+-------------------------------------
+-- Do notation and statements
+-------------------------------------
+
+cvtHsDo do_or_lc stmts
+ = do { stmts' <- cvtStmts stmts
+ ; let body = case last stmts' of
+ L _ (ExprStmt body _ _) -> body
+ ; return $ HsDo do_or_lc (init stmts') body void }
+
+cvtStmts = mapM cvtStmt
+
+cvtStmt :: TH.Stmt -> CvtM (Hs.LStmt RdrName)
+cvtStmt (NoBindS e) = do { e' <- cvtl e; returnL $ mkExprStmt e' }
+cvtStmt (TH.BindS p e) = do { p' <- cvtPat p; e' <- cvtl e; returnL $ mkBindStmt p' e' }
+cvtStmt (TH.LetS ds) = do { ds' <- cvtDecs ds; returnL $ LetStmt ds' }
+cvtStmt (TH.ParS dss) = do { dss' <- mapM cvt_one dss; returnL $ ParStmt dss' }
+ where
+ cvt_one ds = do { ds' <- cvtStmts ds; return (ds', undefined) }
+
+cvtMatch :: TH.Match -> CvtM (Hs.LMatch RdrName)
+cvtMatch (TH.Match p body decs)
+ = do { p' <- cvtPat p
+ ; g' <- cvtGuard body
+ ; decs' <- cvtDecs decs
+ ; returnL $ Hs.Match [p'] Nothing (GRHSs g' decs') }
+
+cvtGuard :: TH.Body -> CvtM [LGRHS RdrName]
+cvtGuard (GuardedB pairs) = mapM cvtpair pairs
+cvtGuard (NormalB e) = do { e' <- cvtl e; g' <- returnL $ GRHS [] e'; return [g'] }
+
+cvtpair :: (TH.Guard, TH.Exp) -> CvtM (LGRHS RdrName)
+cvtpair (NormalG ge,rhs) = do { ge' <- cvtl ge; rhs' <- cvtl rhs
+ ; g' <- returnL $ mkBindStmt truePat ge'
+ ; returnL $ GRHS [g'] rhs' }
+cvtpair (PatG gs,rhs) = do { gs' <- cvtStmts gs; rhs' <- cvtl rhs
+ ; returnL $ GRHS gs' rhs' }
+
+cvtOverLit :: Lit -> CvtM (HsOverLit RdrName)
+cvtOverLit (IntegerL i) = do { force i; return $ mkHsIntegral i }
+cvtOverLit (RationalL r) = do { force r; return $ mkHsFractional r }
-- An Integer is like an an (overloaded) '3' in a Haskell source program
-- Similarly 3.5 for fractionals
-cvtLit :: Lit -> HsLit
-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)
+cvtLit :: Lit -> CvtM HsLit
+cvtLit (IntPrimL i) = do { force i; return $ HsIntPrim i }
+cvtLit (FloatPrimL f) = do { force f; return $ HsFloatPrim f }
+cvtLit (DoublePrimL f) = do { force f; return $ HsDoublePrim f }
+cvtLit (CharL c) = do { force c; return $ HsChar c }
+cvtLit (StringL s) = do { let { s' = mkFastString s }; force s'; return $ HsString s' }
-cvtlp :: TH.Pat -> Hs.LPat RdrName
-cvtlp pat = noLoc (cvtp pat)
+cvtPats :: [TH.Pat] -> CvtM [Hs.LPat RdrName]
+cvtPats pats = mapM cvtPat pats
-cvtp :: TH.Pat -> Hs.Pat RdrName
+cvtPat :: TH.Pat -> CvtM (Hs.LPat RdrName)
+cvtPat pat = wrapL (cvtp pat)
+
+cvtp :: TH.Pat -> CvtM (Hs.Pat RdrName)
cvtp (TH.LitP l)
- | overloadedLit l = NPatIn (cvtOverLit l) Nothing -- Not right for negative
- -- patterns; need to think
- -- about that!
- | 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
+ | overloadedLit l = do { l' <- cvtOverLit l
+ ; return (mkNPat l' Nothing) }
+ -- Not right for negative patterns;
+ -- need to think about that!
+ | otherwise = do { l' <- cvtLit l; return $ Hs.LitPat l' }
+cvtp (TH.VarP s) = do { s' <- vName s; return $ Hs.VarPat s' }
+cvtp (TupP [p]) = cvtp p
+cvtp (TupP ps) = do { ps' <- cvtPats ps; return $ TuplePat ps' Boxed }
+cvtp (ConP s ps) = do { s' <- cNameL s; ps' <- cvtPats ps; return $ ConPatIn s' (PrefixCon ps') }
+cvtp (InfixP p1 s p2) = do { s' <- cNameL s; p1' <- cvtPat p1; p2' <- cvtPat p2
+ ; return $ ConPatIn s' (InfixCon p1' p2') }
+cvtp (TildeP p) = do { p' <- cvtPat p; return $ LazyPat p' }
+cvtp (TH.AsP s p) = do { s' <- vNameL s; p' <- cvtPat p; return $ AsPat s' p' }
+cvtp TH.WildP = return $ WildPat void
+cvtp (RecP c fs) = do { c' <- cNameL c; fs' <- mapM cvtPatFld fs
+ ; return $ ConPatIn c' $ Hs.RecCon fs' }
+cvtp (ListP ps) = do { ps' <- cvtPats ps; return $ ListPat ps' void }
+cvtp (SigP p t) = do { p' <- cvtPat p; t' <- cvtType t; return $ SigPatIn p' t' }
+
+cvtPatFld (s,p) = do { s' <- vNameL s; p' <- cvtPat p; return (s',p') }
-----------------------------------------------------------
-- Types and type variables
-cvt_tvs :: [TH.Name] -> [LHsTyVarBndr RdrName]
-cvt_tvs tvs = map (noLoc . UserTyVar . tName) tvs
-
-cvt_context :: Cxt -> LHsContext RdrName
-cvt_context tys = noLoc (map (noLoc . cvt_pred) tys)
-
-cvt_pred :: TH.Type -> HsPred RdrName
-cvt_pred ty = case split_ty_app ty of
- (ConT tc, tys) -> HsClassP (tconName tc) (map cvtType tys)
- (VarT tv, tys) -> HsClassP (tName tv) (map cvtType tys)
- other -> cvtPanic "Malformed predicate" (text (TH.pprint 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)
+cvtTvs :: [TH.Name] -> CvtM [LHsTyVarBndr RdrName]
+cvtTvs tvs = mapM cvt_tv tvs
+
+cvt_tv tv = do { tv' <- tName tv; returnL $ UserTyVar tv' }
+
+cvtContext :: Cxt -> CvtM (LHsContext RdrName)
+cvtContext tys = do { preds' <- mapM cvtPred tys; returnL preds' }
+
+cvtPred :: TH.Type -> CvtM (LHsPred RdrName)
+cvtPred ty
+ = do { (head, tys') <- split_ty_app ty
+ ; case head of
+ ConT tc -> do { tc' <- tconName tc; returnL $ HsClassP tc' tys' }
+ VarT tv -> do { tv' <- tName tv; returnL $ HsClassP tv' tys' }
+ other -> failWith (ptext SLIT("Malformed predicate") <+> text (TH.pprint ty)) }
+
+cvtType :: TH.Type -> CvtM (LHsType RdrName)
+cvtType ty = do { (head, tys') <- split_ty_app ty
+ ; case head of
+ TupleT n | length tys' == n -> returnL (HsTupleTy Boxed tys')
+ | n == 0 -> mk_apps (HsTyVar (getRdrName unitTyCon)) tys'
+ | otherwise -> mk_apps (HsTyVar (getRdrName (tupleTyCon Boxed n))) tys'
+ ArrowT | [x',y'] <- tys' -> returnL (HsFunTy x' y')
+ ListT | [x'] <- tys' -> returnL (HsListTy x')
+ VarT nm -> do { nm' <- tName nm; mk_apps (HsTyVar nm') tys' }
+ ConT nm -> do { nm' <- tconName nm; mk_apps (HsTyVar nm') tys' }
+
+ ForallT tvs cxt ty | null tys' -> do { tvs' <- cvtTvs tvs
+ ; cxt' <- cvtContext cxt
+ ; ty' <- cvtType ty
+ ; returnL $ mkExplicitHsForAllTy tvs' cxt' ty' }
+ otherwise -> failWith (ptext SLIT("Malformed type") <+> text (show ty))
+ }
+ where
+ mk_apps head [] = returnL head
+ mk_apps head (ty:tys) = do { head' <- returnL head; mk_apps (HsAppTy head' ty) tys }
-split_ty_app :: TH.Type -> (TH.Type, [TH.Type])
+split_ty_app :: TH.Type -> CvtM (TH.Type, [LHsType RdrName])
split_ty_app ty = go ty []
where
- go (AppT f a) as = go f (a:as)
- go f as = (f,as)
+ go (AppT f a) as' = do { a' <- cvtType a; go f (a':as') }
+ go f as = return (f,as)
-----------------------------------------------------------
-sigP :: Dec -> Bool
-sigP (TH.SigD _ _) = True
-sigP 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 = nlConPat (getRdrName trueDataCon) []
-falsePat = nlConPat (getRdrName falseDataCon) []
overloadedLit :: Lit -> Bool
-- True for literals that Haskell treats as overloaded
void :: Type.Type
void = placeHolderType
-loc0 :: SrcSpan
-loc0 = srcLocSpan generatedSrcLoc
-
--------------------------------------------------------------------
-- Turning Name back into RdrName
--------------------------------------------------------------------
-- variable names
-vName :: TH.Name -> RdrName
-vName = thRdrName OccName.varName
+vNameL, cNameL, tconNameL :: TH.Name -> CvtM (Located RdrName)
+vName, cName, tName, tconName :: TH.Name -> CvtM RdrName
+
+vNameL n = wrapL (vName n)
+vName n = cvtName OccName.varName n
-- Constructor function names; this is Haskell source, hence srcDataName
-cName :: TH.Name -> RdrName
-cName = thRdrName OccName.srcDataName
+cNameL n = wrapL (cName n)
+cName n = cvtName OccName.dataName n
-- Type variable names
-tName :: TH.Name -> RdrName
-tName = thRdrName OccName.tvName
+tName n = cvtName OccName.tvName n
-- Type Constructor names
-tconName = thRdrName OccName.tcName
+tconNameL n = wrapL (tconName n)
+tconName n = cvtName OccName.tcClsName n
-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.)
+cvtName :: OccName.NameSpace -> TH.Name -> CvtM RdrName
+cvtName ctxt_ns (TH.Name occ flavour)
+ | not (okOcc ctxt_ns occ_str) = failWith (badOcc ctxt_ns occ_str)
+ | otherwise = force (thRdrName ctxt_ns occ_str flavour)
+ where
+ occ_str = TH.occString occ
-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)
+okOcc :: OccName.NameSpace -> String -> Bool
+okOcc _ [] = False
+okOcc ns str@(c:_)
+ | OccName.isVarName ns = startsVarId c || startsVarSym c
+ | otherwise = startsConId c || startsConSym c || str == "[]"
-mk_uniq :: Int# -> Unique
-mk_uniq u = mkUniqueGrimily (I# u)
+badOcc :: OccName.NameSpace -> String -> SDoc
+badOcc ctxt_ns occ
+ = ptext SLIT("Illegal") <+> pprNameSpace ctxt_ns
+ <+> ptext SLIT("name:") <+> quotes (text occ)
+
+thRdrName :: OccName.NameSpace -> String -> TH.NameFlavour -> RdrName
+-- This turns a Name into a RdrName
+-- The passed-in name space tells what the context is expecting;
+-- use it unless the TH name knows what name-space it comes
+-- from, in which case use the latter
+--
+-- ToDo: we may generate silly RdrNames, by passing a name space
+-- that doesn't match the string, like VarName ":+",
+-- which will give confusing error messages later
+--
+-- The strict applications ensure that any buried exceptions get forced
+thRdrName ctxt_ns occ (TH.NameG th_ns mod) = (mkOrig $! (mk_mod mod)) $! (mk_occ (mk_ghc_ns th_ns) occ)
+thRdrName ctxt_ns occ (TH.NameL uniq) = nameRdrName $! (((Name.mkInternalName $! (mk_uniq uniq)) $! (mk_occ ctxt_ns occ)) noSrcLoc)
+thRdrName ctxt_ns occ (TH.NameQ mod) = (mkRdrQual $! (mk_mod mod)) $! (mk_occ ctxt_ns occ)
+thRdrName ctxt_ns occ (TH.NameU uniq) = mkRdrUnqual $! (mk_uniq_occ ctxt_ns occ uniq)
+thRdrName ctxt_ns occ TH.NameS
+ | Just name <- isBuiltInOcc ctxt_ns occ = nameRdrName $! name
+ | otherwise = mkRdrUnqual $! (mk_occ ctxt_ns occ)
+
+isBuiltInOcc :: OccName.NameSpace -> String -> Maybe Name.Name
+-- Built in syntax isn't "in scope" so an Unqual RdrName won't do
+-- We must generate an Exact name, just as the parser does
+isBuiltInOcc ctxt_ns occ
+ = case occ of
+ ":" -> Just (Name.getName consDataCon)
+ "[]" -> Just (Name.getName nilDataCon)
+ "()" -> Just (tup_name 0)
+ '(' : ',' : rest -> go_tuple 2 rest
+ other -> Nothing
+ where
+ go_tuple n ")" = Just (tup_name n)
+ go_tuple n (',' : rest) = go_tuple (n+1) rest
+ go_tuple n other = Nothing
+
+ tup_name n
+ | OccName.isTcClsName ctxt_ns = Name.getName (tupleTyCon Boxed n)
+ | otherwise = Name.getName (tupleCon Boxed n)
+
+mk_uniq_occ :: OccName.NameSpace -> String -> Int# -> OccName.OccName
+mk_uniq_occ ns occ uniq
+ = OccName.mkOccName ns (occ ++ '[' : shows (mk_uniq uniq) "]")
+ -- The idea here is to make a name that
+ -- a) the user could not possibly write, and
+ -- b) cannot clash with another NameU
+ -- Previously I generated an Exact RdrName with mkInternalName.
+ -- This works fine for local binders, but does not work at all for
+ -- top-level binders, which must have External Names, since they are
+ -- rapidly baked into data constructors and the like. Baling out
+ -- and generating an unqualified RdrName here is the simple solution
-- 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_occ :: OccName.NameSpace -> String -> OccName.OccName
+mk_occ ns occ = OccName.mkOccNameFS ns (mkFastString occ)
-mk_mod :: TH.ModName -> ModuleName
-mk_mod mod = mkModuleName (TH.modString mod)
+mk_ghc_ns :: TH.NameSpace -> OccName.NameSpace
+mk_ghc_ns TH.DataName = OccName.dataName
+mk_ghc_ns TH.TcClsName = OccName.tcClsName
+mk_ghc_ns TH.VarName = OccName.varName
+
+mk_mod :: TH.ModName -> Module
+mk_mod mod = mkModule (TH.modString mod)
+
+mk_uniq :: Int# -> Unique
+mk_uniq u = mkUniqueGrimily (I# u)
\end{code}
projects / ghc-hetmet.git / blobdiff