\section{Read parse tree built by Yacc parser}
\begin{code}
-#include "HsVersions.h"
-
module ReadPrefix ( rdModule ) where
-IMP_Ubiq()
-IMPORT_1_3(IO(hPutStr, stderr))
-#if __GLASGOW_HASKELL__ == 201
-import GHCio(stThen)
-#elif __GLASGOW_HASKELL__ >= 202
-import GlaExts
-import IOBase
-import PrelRead
-#endif
+#include "HsVersions.h"
import UgenAll -- all Yacc parser gumpff...
import PrefixSyn -- and various syntaxen.
import BasicTypes ( Fixity(..), FixityDirection(..), NewOrData(..), IfaceFlavour(..) )
import PrefixToHs
-import CmdLineOpts ( opt_PprUserLength, opt_NoImplicitPrelude )
-import ErrUtils ( addErrLoc, ghcExit )
+import CmdLineOpts ( opt_NoImplicitPrelude )
import FiniteMap ( elemFM, FiniteMap )
-import Name ( OccName(..), SYN_IE(Module) )
+import Name ( OccName(..), Module )
import Lex ( isLexConId )
-import Outputable ( Outputable(..), PprStyle(..) )
+import Outputable
import PrelMods ( pRELUDE )
-import Pretty
-import SrcLoc ( mkGeneratedSrcLoc, noSrcLoc, SrcLoc )
-import Util ( nOfThem, pprError, panic )
+import Util ( nOfThem )
+import FastString ( mkFastCharString )
+import IO ( hPutStr, stderr )
+import PrelRead ( readRational__ )
\end{code}
%************************************************************************
%************************************************************************
\begin{code}
-#if __GLASGOW_HASKELL__ == 201
-# define PACK_STR packCString
-#elif __GLASGOW_HASKELL__ >= 202
-# define PACK_STR mkFastCharString
-#else
-# define PACK_STR mkFastCharString
-#endif
-
rdModule :: IO (Module, -- this module's name
RdrNameHsModule) -- the main goods
rdModule
- = _ccall_ hspmain `CCALL_THEN` \ pt -> -- call the Yacc parser!
+ = _ccall_ hspmain >>= \ pt -> -- call the Yacc parser!
let
- srcfile = PACK_STR ``input_filename'' -- What A Great Hack! (TM)
+ srcfile = mkFastCharString ``input_filename'' -- What A Great Hack! (TM)
in
initUgn $
rdU_tree pt `thenUgn` \ (U_hmodule modname himplist hexplist hfixlist
returnUgn (
HsLam (foldr PatMatch
(GRHSMatch (GRHSsAndBindsIn
- [OtherwiseGRHS body src_loc]
+ (unguardedRHS body src_loc)
EmptyBinds))
pats)
)
U_record con rbinds -> -- record construction
wlkDataId con `thenUgn` \ rcon ->
wlkList rdRbind rbinds `thenUgn` \ recbinds ->
- returnUgn (RecordCon rcon recbinds)
+ returnUgn (RecordCon rcon (HsVar rcon) recbinds)
U_rupdate updexp updbinds -> -- record update
wlkExpr updexp `thenUgn` \ aexp ->
U_dobind _ _ _ -> error "U_dobind"
U_doexp _ _ -> error "U_doexp"
U_rbind _ _ -> error "U_rbind"
- U_fixop _ _ _ -> error "U_fixop"
+ U_fixop _ _ _ _ -> error "U_fixop"
#endif
rdRbind pt
ConPatIn x [] -> returnUgn (x, lpats)
ConOpPatIn x op _ y -> returnUgn (op, x:y:lpats)
_ -> getSrcLocUgn `thenUgn` \ loc ->
- let
- err = addErrLoc loc "Illegal pattern `application'"
- (\sty -> hsep (map (ppr sty) (lpat:lpats)))
- msg = show (err (PprForUser opt_PprUserLength))
- in
-#if __GLASGOW_HASKELL__ == 201
- ioToUgnM (GHCbase.ioToPrimIO (hPutStr stderr msg)) `thenUgn` \ _ ->
- ioToUgnM (GHCbase.ioToPrimIO (ghcExit 1)) `thenUgn` \ _ ->
-#elif __GLASGOW_HASKELL__ >= 202 && __GLASGOW_HASKELL__ < 209
- ioToUgnM (IOBase.ioToPrimIO (hPutStr stderr msg)) `thenUgn` \ _ ->
- ioToUgnM (IOBase.ioToPrimIO (ghcExit 1)) `thenUgn` \ _ ->
-#else
- ioToUgnM (hPutStr stderr msg) `thenUgn` \ _ ->
- ioToUgnM (ghcExit 1) `thenUgn` \ _ ->
-#endif
- returnUgn (error "ReadPrefix")
+ pprPanic "Illegal pattern `application'"
+ (ppr loc <> colon <+> hsep (map ppr (lpat:lpats)))
) `thenUgn` \ (n, arg_pats) ->
returnUgn (ConPatIn n arg_pats)
where
as_char s = _HEAD_ s
as_integer s = readInteger (_UNPK_ s)
-#if __GLASGOW_HASKELL__ == 201
- as_rational s = GHCbase.readRational__ (_UNPK_ s) -- non-std
-#elif __GLASGOW_HASKELL__ == 202
- as_rational s = case readRational (_UNPK_ s) of { [(a,_)] -> a }
-#elif __GLASGOW_HASKELL__ >= 203
as_rational s = readRational__ (_UNPK_ s) -- use non-std readRational__
-- to handle rationals with leading '-'
-#else
- as_rational s = _readRational (_UNPK_ s) -- non-std
-#endif
as_string s = s
\end{code}
U_tbind tctxt ttype tcons tderivs srcline ->
mkSrcLocUgn srcline $ \ src_loc ->
wlkContext tctxt `thenUgn` \ ctxt ->
- wlkTyConAndTyVars ttype `thenUgn` \ (tycon, tyvars) ->
+ wlkConAndTyVars ttype `thenUgn` \ (tycon, tyvars) ->
wlkList rdConDecl tcons `thenUgn` \ cons ->
wlkDerivings tderivs `thenUgn` \ derivings ->
returnUgn (RdrTyDecl (TyData DataType ctxt tycon tyvars cons derivings noDataPragmas src_loc))
U_ntbind ntctxt nttype ntcon ntderivs srcline ->
mkSrcLocUgn srcline $ \ src_loc ->
wlkContext ntctxt `thenUgn` \ ctxt ->
- wlkTyConAndTyVars nttype `thenUgn` \ (tycon, tyvars) ->
+ wlkConAndTyVars nttype `thenUgn` \ (tycon, tyvars) ->
wlkList rdConDecl ntcon `thenUgn` \ cons ->
wlkDerivings ntderivs `thenUgn` \ derivings ->
returnUgn (RdrTyDecl (TyData NewType ctxt tycon tyvars cons derivings noDataPragmas src_loc))
-- "type" declaration
U_nbind nbindid nbindas srcline ->
mkSrcLocUgn srcline $ \ src_loc ->
- wlkTyConAndTyVars nbindid `thenUgn` \ (tycon, tyvars) ->
+ wlkConAndTyVars nbindid `thenUgn` \ (tycon, tyvars) ->
wlkMonoType nbindas `thenUgn` \ expansion ->
returnUgn (RdrTyDecl (TySynonym tycon tyvars expansion src_loc))
-- "class" declaration
U_cbind cbindc cbindid cbindw srcline ->
- mkSrcLocUgn srcline $ \ src_loc ->
- wlkContext cbindc `thenUgn` \ ctxt ->
- wlkClassAssertTy cbindid `thenUgn` \ (clas, tyvar)->
- wlkBinding cbindw `thenUgn` \ binding ->
- getSrcFileUgn `thenUgn` \ sf ->
+ mkSrcLocUgn srcline $ \ src_loc ->
+ wlkContext cbindc `thenUgn` \ ctxt ->
+ wlkConAndTyVars cbindid `thenUgn` \ (clas, tyvars) ->
+ wlkBinding cbindw `thenUgn` \ binding ->
+ getSrcFileUgn `thenUgn` \ sf ->
let
(final_methods, final_sigs) = cvMonoBindsAndSigs sf cvClassOpSig binding
in
returnUgn (RdrClassDecl
- (ClassDecl ctxt clas tyvar final_sigs final_methods noClassPragmas src_loc))
+ (mkClassDecl ctxt clas tyvars final_sigs final_methods noClassPragmas src_loc))
-- "instance" declaration
- U_ibind ibindc iclas ibindi ibindw srcline ->
+ U_ibind ty ibindw srcline ->
+ -- The "ty" contains the instance context too
+ -- So for "instance Eq a => Eq [a]" the type will be
+ -- Eq a => Eq [a]
mkSrcLocUgn srcline $ \ src_loc ->
- wlkContext ibindc `thenUgn` \ ctxt ->
- wlkTCId iclas `thenUgn` \ clas ->
- wlkMonoType ibindi `thenUgn` \ at_ty ->
- wlkBinding ibindw `thenUgn` \ binding ->
- getSrcModUgn `thenUgn` \ modname ->
- getSrcFileUgn `thenUgn` \ sf ->
+ wlkInstType ty `thenUgn` \ inst_ty ->
+ wlkBinding ibindw `thenUgn` \ binding ->
+ getSrcModUgn `thenUgn` \ modname ->
+ getSrcFileUgn `thenUgn` \ sf ->
let
(binds,uprags) = cvMonoBindsAndSigs sf cvInstDeclSig binding
- inst_ty = HsPreForAllTy ctxt (MonoDictTy clas at_ty)
in
returnUgn (RdrInstDecl
(InstDecl inst_ty binds uprags Nothing {- No dfun id -} src_loc))
wlkMonoType targ `thenUgn` \ ty2 ->
returnUgn (MonoFunTy ty1 ty2)
+wlkInstType ttype
+ = case ttype of
+ U_context tcontextl tcontextt -> -- context
+ wlkContext tcontextl `thenUgn` \ ctxt ->
+ wlkConAndTys tcontextt `thenUgn` \ (clas, tys) ->
+ returnUgn (HsPreForAllTy ctxt (MonoDictTy clas tys))
+
+ other -> -- something else
+ wlkConAndTys other `thenUgn` \ (clas, tys) ->
+ returnUgn (HsPreForAllTy [{-no context-}] (MonoDictTy clas tys))
\end{code}
\begin{code}
-wlkTyConAndTyVars :: U_ttype -> UgnM (RdrName, [HsTyVar RdrName])
-wlkContext :: U_list -> UgnM RdrNameContext
-wlkClassAssertTy :: U_ttype -> UgnM (RdrName, HsTyVar RdrName)
-
-wlkTyConAndTyVars ttype
+wlkConAndTyVars :: U_ttype -> UgnM (RdrName, [HsTyVar RdrName])
+wlkConAndTyVars ttype
= wlkMonoType ttype `thenUgn` \ ty ->
let
split (MonoTyApp fun (MonoTyVar arg)) args = split fun (UserTyVar arg : args)
split (MonoTyVar tycon) args = (tycon,args)
+ split other args = pprPanic "ERROR: malformed type: "
+ (ppr other)
in
returnUgn (split ty [])
-wlkContext list
- = wlkList rdMonoType list `thenUgn` \ tys ->
- returnUgn (map mk_class_assertion tys)
-wlkClassAssertTy xs
- = wlkMonoType xs `thenUgn` \ mono_ty ->
- returnUgn (case mk_class_assertion mono_ty of
- (clas, MonoTyVar tyvar) -> (clas, UserTyVar tyvar)
- )
+wlkContext :: U_list -> UgnM RdrNameContext
+rdConAndTys :: ParseTree -> UgnM (RdrName, [HsType RdrName])
-mk_class_assertion :: RdrNameHsType -> (RdrName, RdrNameHsType)
+wlkContext list = wlkList rdConAndTys list
-mk_class_assertion (MonoTyApp (MonoTyVar name) ty@(MonoTyVar tyname)) = (name, ty)
-mk_class_assertion other
- = pprError "ERROR: malformed type context: " (ppr (PprForUser opt_PprUserLength) other)
- -- regrettably, the parser does let some junk past
- -- e.g., f :: Num {-nothing-} => a -> ...
+rdConAndTys pt
+ = rdU_ttype pt `thenUgn` \ ttype ->
+ wlkConAndTys ttype
+
+wlkConAndTys ttype
+ = wlkMonoType ttype `thenUgn` \ ty ->
+ let
+ split (MonoTyApp fun ty) tys = split fun (ty : tys)
+ split (MonoTyVar tycon) tys = (tycon, tys)
+ split other tys = pprPanic "ERROR: malformed type: "
+ (ppr other)
+ in
+ returnUgn (split ty [])
\end{code}
\begin{code}
rdFixOp pt
= rdU_tree pt `thenUgn` \ fix ->
case fix of
- U_fixop op dir_n prec -> wlkVarId op `thenUgn` \ op ->
- returnUgn (FixityDecl op (Fixity prec dir) noSrcLoc)
- -- ToDo: add SrcLoc!
+ U_fixop op dir_n prec srcline -> wlkVarId op `thenUgn` \ op ->
+ mkSrcLocUgn srcline $ \ src_loc ->
+ returnUgn (FixityDecl op (Fixity prec dir) src_loc)
where
dir = case dir_n of
(-1) -> InfixL
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