X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fparser%2FParser.y.pp;h=8c4b03fb21a51729cafe2f998fbb58fcaa82045a;hb=351e8d3641128e37d32dd35179a19c0b3350661b;hp=f72c8b9d83f46b2085b40957b5662ba61a73ce8f;hpb=c8732b3c99e93c36ad28e23d2b901b794e89542a;p=ghc-hetmet.git diff --git a/compiler/parser/Parser.y.pp b/compiler/parser/Parser.y.pp index f72c8b9..8c4b03f 100644 --- a/compiler/parser/Parser.y.pp +++ b/compiler/parser/Parser.y.pp @@ -8,6 +8,13 @@ -- --------------------------------------------------------------------------- { +{-# OPTIONS -w #-} +-- The above warning supression flag is a temporary kludge. +-- While working on this module you are encouraged to remove it and fix +-- any warnings in the module. See +-- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings +-- for details + module Parser ( parseModule, parseStmt, parseIdentifier, parseType, parseHeader ) where @@ -20,6 +27,7 @@ import HscTypes ( IsBootInterface, DeprecTxt ) import Lexer import RdrName import TysWiredIn ( unitTyCon, unitDataCon, tupleTyCon, tupleCon, nilDataCon, + unboxedSingletonTyCon, unboxedSingletonDataCon, listTyCon_RDR, parrTyCon_RDR, consDataCon_RDR ) import Type ( funTyCon ) import ForeignCall ( Safety(..), CExportSpec(..), CLabelString, @@ -35,6 +43,7 @@ import StaticFlags ( opt_SccProfilingOn, opt_Hpc ) import Type ( Kind, mkArrowKind, liftedTypeKind, unliftedTypeKind ) import BasicTypes ( Boxity(..), Fixity(..), FixityDirection(..), IPName(..), Activation(..), defaultInlineSpec ) +import DynFlags import OrdList import HaddockParse import {-# SOURCE #-} HaddockLex hiding ( Token ) @@ -44,7 +53,7 @@ import FastString import Maybes ( orElse ) import Outputable -import Control.Monad ( when ) +import Control.Monad ( unless ) import GHC.Exts import Data.Char import Control.Monad ( mplus ) @@ -52,6 +61,28 @@ import Control.Monad ( mplus ) {- ----------------------------------------------------------------------------- +24 Februar 2006 + +Conflicts: 33 shift/reduce + 1 reduce/reduce + +The reduce/reduce conflict is weird. It's between tyconsym and consym, and I +would think the two should never occur in the same context. + + -=chak + +----------------------------------------------------------------------------- +31 December 2006 + +Conflicts: 34 shift/reduce + 1 reduce/reduce + +The reduce/reduce conflict is weird. It's between tyconsym and consym, and I +would think the two should never occur in the same context. + + -=chak + +----------------------------------------------------------------------------- 6 December 2006 Conflicts: 32 shift/reduce @@ -180,7 +211,6 @@ incorrect. 'deriving' { L _ ITderiving } 'do' { L _ ITdo } 'else' { L _ ITelse } - 'for' { L _ ITfor } 'hiding' { L _ IThiding } 'if' { L _ ITif } 'import' { L _ ITimport } @@ -208,13 +238,15 @@ incorrect. 'threadsafe' { L _ ITthreadsafe } 'unsafe' { L _ ITunsafe } 'mdo' { L _ ITmdo } - 'iso' { L _ ITiso } 'family' { L _ ITfamily } 'stdcall' { L _ ITstdcallconv } 'ccall' { L _ ITccallconv } 'dotnet' { L _ ITdotnet } 'proc' { L _ ITproc } -- for arrow notation extension 'rec' { L _ ITrec } -- for arrow notation extension + 'group' { L _ ITgroup } -- for list transform extension + 'by' { L _ ITby } -- for list transform extension + 'using' { L _ ITusing } -- for list transform extension '{-# INLINE' { L _ (ITinline_prag _) } '{-# SPECIALISE' { L _ ITspec_prag } @@ -294,7 +326,6 @@ incorrect. DOCPREV { L _ (ITdocCommentPrev _) } DOCNAMED { L _ (ITdocCommentNamed _) } DOCSECTION { L _ (ITdocSection _ _) } - DOCOPTIONS { L _ (ITdocOptions _) } -- Template Haskell '[|' { L _ ITopenExpQuote } @@ -306,6 +337,7 @@ TH_ID_SPLICE { L _ (ITidEscape _) } -- $x '$(' { L _ ITparenEscape } -- $( exp ) TH_VAR_QUOTE { L _ ITvarQuote } -- 'x TH_TY_QUOTE { L _ ITtyQuote } -- ''T +TH_QUASIQUOTE { L _ (ITquasiQuote _) } %monad { P } { >>= } { return } %lexer { lexer } { L _ ITeof } @@ -324,6 +356,7 @@ identifier :: { Located RdrName } | qcon { $1 } | qvarop { $1 } | qconop { $1 } + | '(' '->' ')' { LL $ getRdrName funTyCon } ----------------------------------------------------------------------------- -- Module Header @@ -336,22 +369,19 @@ identifier :: { Located RdrName } -- know what they are doing. :-) module :: { Located (HsModule RdrName) } - : optdoc 'module' modid maybemoddeprec maybeexports 'where' body - {% fileSrcSpan >>= \ loc -> case $1 of { (opt, info, doc) -> - return (L loc (HsModule (Just $3) $5 (fst $7) (snd $7) $4 - opt info doc) )}} - | missing_module_keyword top close + : maybedocheader 'module' modid maybemoddeprec maybeexports 'where' body + {% fileSrcSpan >>= \ loc -> case $1 of { (info, doc) -> + return (L loc (HsModule (Just $3) $5 (fst $7) (snd $7) $4 + info doc) )}} + | body2 {% fileSrcSpan >>= \ loc -> - return (L loc (HsModule Nothing Nothing - (fst $2) (snd $2) Nothing Nothing emptyHaddockModInfo + return (L loc (HsModule Nothing Nothing + (fst $1) (snd $1) Nothing emptyHaddockModInfo Nothing)) } -optdoc :: { (Maybe String, HaddockModInfo RdrName, Maybe (HsDoc RdrName)) } - : moduleheader { (Nothing, fst $1, snd $1) } - | docoptions { (Just $1, emptyHaddockModInfo, Nothing)} - | docoptions moduleheader { (Just $1, fst $2, snd $2) } - | moduleheader docoptions { (Just $2, fst $1, snd $1) } - | {- empty -} { (Nothing, emptyHaddockModInfo, Nothing) } +maybedocheader :: { (HaddockModInfo RdrName, Maybe (HsDoc RdrName)) } + : moduleheader { (fst $1, snd $1) } + | {- empty -} { (emptyHaddockModInfo, Nothing) } missing_module_keyword :: { () } : {- empty -} {% pushCurrentContext } @@ -364,6 +394,10 @@ body :: { ([LImportDecl RdrName], [LHsDecl RdrName]) } : '{' top '}' { $2 } | vocurly top close { $2 } +body2 :: { ([LImportDecl RdrName], [LHsDecl RdrName]) } + : '{' top '}' { $2 } + | missing_module_keyword top close { $2 } + top :: { ([LImportDecl RdrName], [LHsDecl RdrName]) } : importdecls { (reverse $1,[]) } | importdecls ';' cvtopdecls { (reverse $1,$3) } @@ -376,14 +410,14 @@ cvtopdecls :: { [LHsDecl RdrName] } -- Module declaration & imports only header :: { Located (HsModule RdrName) } - : optdoc 'module' modid maybemoddeprec maybeexports 'where' header_body - {% fileSrcSpan >>= \ loc -> case $1 of { (opt, info, doc) -> - return (L loc (HsModule (Just $3) $5 $7 [] $4 - opt info doc))}} + : maybedocheader 'module' modid maybemoddeprec maybeexports 'where' header_body + {% fileSrcSpan >>= \ loc -> case $1 of { (info, doc) -> + return (L loc (HsModule (Just $3) $5 $7 [] $4 + info doc))}} | missing_module_keyword importdecls {% fileSrcSpan >>= \ loc -> - return (L loc (HsModule Nothing Nothing $2 [] Nothing - Nothing emptyHaddockModInfo Nothing)) } + return (L loc (HsModule Nothing Nothing $2 [] Nothing + emptyHaddockModInfo Nothing)) } header_body :: { [LImportDecl RdrName] } : '{' importdecls { $2 } @@ -547,7 +581,7 @@ ty_decl :: { LTyClDecl RdrName } -- infix type constructors to be declared {% do { (tc, tvs, _) <- checkSynHdr $2 False ; return (L (comb2 $1 $4) - (TySynonym tc tvs Nothing $4)) + (TySynonym tc tvs Nothing $4)) } } -- type family declarations @@ -556,11 +590,8 @@ ty_decl :: { LTyClDecl RdrName } -- infix type constructors to be declared -- {% do { (tc, tvs, _) <- checkSynHdr $3 False - ; let kind = case unLoc $4 of - Nothing -> liftedTypeKind - Just ki -> ki ; return (L (comb3 $1 $3 $4) - (TyFunction tc tvs False kind)) + (TyFamily TypeFamily tc tvs (unLoc $4))) } } -- type instance declarations @@ -596,16 +627,15 @@ ty_decl :: { LTyClDecl RdrName } (unLoc $3) (reverse (unLoc $5)) (unLoc $6)) } } -- data/newtype family - | data_or_newtype 'family' tycl_hdr opt_kind_sig + | 'data' 'family' tycl_hdr opt_kind_sig {% do { let {(ctxt, tc, tvs, tparms) = unLoc $3} - ; checkTyVars tparms -- no type pattern - ; let kind = case unLoc $4 of - Nothing -> liftedTypeKind - Just ki -> ki + ; checkTyVars tparms -- no type pattern + ; unless (null (unLoc ctxt)) $ -- and no context + parseError (getLoc ctxt) + "A family declaration cannot have a context" ; return $ L (comb3 $1 $2 $4) - (mkTyData (unLoc $1) (ctxt, tc, tvs, Nothing) - (Just kind) [] Nothing) } } + (TyFamily DataFamily tc tvs (unLoc $4)) } } -- data/newtype instance declaration | data_or_newtype 'instance' tycl_hdr constrs deriving @@ -645,11 +675,8 @@ at_decl_cls :: { LTyClDecl RdrName } -- infix type constructors to be declared -- {% do { (tc, tvs, _) <- checkSynHdr $2 False - ; let kind = case unLoc $3 of - Nothing -> liftedTypeKind - Just ki -> ki ; return (L (comb3 $1 $2 $3) - (TyFunction tc tvs False kind)) + (TyFamily TypeFamily tc tvs (unLoc $3))) } } -- default type instance @@ -663,16 +690,16 @@ at_decl_cls :: { LTyClDecl RdrName } } } -- data/newtype family declaration - | data_or_newtype tycl_hdr opt_kind_sig + | 'data' tycl_hdr opt_kind_sig {% do { let {(ctxt, tc, tvs, tparms) = unLoc $2} - ; checkTyVars tparms -- no type pattern - ; let kind = case unLoc $3 of - Nothing -> liftedTypeKind - Just ki -> ki + ; checkTyVars tparms -- no type pattern + ; unless (null (unLoc ctxt)) $ -- and no context + parseError (getLoc ctxt) + "A family declaration cannot have a context" ; return $ L (comb3 $1 $2 $3) - (mkTyData (unLoc $1) (ctxt, tc, tvs, Nothing) - (Just kind) [] Nothing) } } + (TyFamily DataFamily tc tvs (unLoc $3)) + } } -- Associate type instances -- @@ -709,10 +736,6 @@ at_decl_inst :: { LTyClDecl RdrName } (mkTyData (unLoc $1) (ctxt, tc, tvs, Just tparms) (unLoc $3) (reverse (unLoc $5)) (unLoc $6)) } } -opt_iso :: { Bool } - : { False } - | 'iso' { True } - data_or_newtype :: { Located NewOrData } : 'data' { L1 DataType } | 'newtype' { L1 NewType } @@ -740,10 +763,7 @@ tycl_hdr :: { Located (LHsContext RdrName, -- Glasgow extension: stand-alone deriving declarations stand_alone_deriving :: { LDerivDecl RdrName } - : 'deriving' qtycon 'for' qtycon {% do { p <- checkInstType (fmap HsTyVar $2) - ; checkDerivDecl (LL (DerivDecl p $4)) } } - - | 'deriving' '(' inst_type ')' 'for' qtycon {% checkDerivDecl (LL (DerivDecl $3 $6)) } + : 'deriving' 'instance' inst_type {% checkDerivDecl (LL (DerivDecl $3)) } ----------------------------------------------------------------------------- -- Nested declarations @@ -802,7 +822,11 @@ where_inst :: { Located (OrdList (LHsDecl RdrName)) } -- Reversed -- Declarations in binding groups other than classes and instances -- decls :: { Located (OrdList (LHsDecl RdrName)) } - : decls ';' decl { LL (unLoc $1 `appOL` unLoc $3) } + : decls ';' decl { let { this = unLoc $3; + rest = unLoc $1; + these = unLoc $1 `appOL` unLoc $3 } + in rest `seq` this `seq` these `seq` + LL these } | decls ';' { LL (unLoc $1) } | decl { $1 } | {- empty -} { noLoc nilOL } @@ -952,7 +976,7 @@ gentypedoc :: { LHsType RdrName } ctypedoc :: { LHsType RdrName } : 'forall' tv_bndrs '.' ctypedoc { LL $ mkExplicitHsForAllTy $2 (noLoc []) $4 } - | context '=>' gentypedoc { LL $ mkImplicitHsForAllTy $1 $3 } + | context '=>' ctypedoc { LL $ mkImplicitHsForAllTy $1 $3 } -- A type of form (context => type) is an *implicit* HsForAllTy | gentypedoc { $1 } @@ -1125,7 +1149,7 @@ forall :: { Located [LHsTyVarBndr RdrName] } : 'forall' tv_bndrs '.' { LL $2 } | {- empty -} { noLoc [] } -constr_stuff :: { Located (Located RdrName, HsConDetails RdrName (LBangType RdrName)) } +constr_stuff :: { Located (Located RdrName, HsConDeclDetails RdrName) } -- We parse the constructor declaration -- C t1 t2 -- as a btype (treating C as a type constructor) and then convert C to be @@ -1138,7 +1162,7 @@ constr_stuff :: { Located (Located RdrName, HsConDetails RdrName (LBangType RdrN | oqtycon '{' fielddecls '}' {% mkRecCon $1 $3 >>= return.LL } | btype conop btype { LL ($2, InfixCon $1 $3) } -constr_stuff_record :: { Located (Located RdrName, HsConDetails RdrName (LBangType RdrName)) } +constr_stuff_record :: { Located (Located RdrName, HsConDeclDetails RdrName) } : oqtycon '{' '}' {% mkRecCon $1 [] >>= return.sL (comb2 $1 $>) } | oqtycon '{' fielddecls '}' {% mkRecCon $1 $3 >>= return.sL (comb2 $1 $>) } @@ -1201,8 +1225,9 @@ decl :: { Located (OrdList (LHsDecl RdrName)) } return (LL $ unitOL $ LL $ ValD ( PatBind (LL $ BangPat pat) (unLoc $3) placeHolderType placeHolderNames)) } } - | infixexp opt_sig rhs {% do { r <- checkValDef $1 $2 $3; - return (LL $ unitOL (LL $ ValD r)) } } + | infixexp opt_sig rhs {% do { r <- checkValDef $1 $2 $3; + let { l = comb2 $1 $> }; + return $! (sL l (unitOL $! (sL l $ ValD r))) } } | docdecl { LL $ unitOL $1 } rhs :: { Located (GRHSs RdrName) } @@ -1214,7 +1239,7 @@ gdrhs :: { Located [LGRHS RdrName] } | gdrh { L1 [$1] } gdrh :: { LGRHS RdrName } - : '|' quals '=' exp { sL (comb2 $1 $>) $ GRHS (reverse (unLoc $2)) $4 } + : '|' guardquals '=' exp { sL (comb2 $1 $>) $ GRHS (unLoc $2) $4 } sigdecl :: { Located (OrdList (LHsDecl RdrName)) } : infixexp '::' sigtypedoc @@ -1259,7 +1284,7 @@ exp10 :: { LHsExpr RdrName } | 'let' binds 'in' exp { LL $ HsLet (unLoc $2) $4 } | 'if' exp 'then' exp 'else' exp { LL $ HsIf $2 $4 $6 } | 'case' exp 'of' altslist { LL $ HsCase $2 (mkMatchGroup (unLoc $4)) } - | '-' fexp { LL $ mkHsNegApp $2 } + | '-' fexp { LL $ NegApp $2 noSyntaxExpr } | 'do' stmtlist {% let loc = comb2 $1 $2 in checkDo loc (unLoc $2) >>= \ (stmts,body) -> @@ -1285,7 +1310,8 @@ exp10 :: { LHsExpr RdrName } | fexp { $1 } scc_annot :: { Located FastString } - : '_scc_' STRING { LL $ getSTRING $2 } + : '_scc_' STRING {% (addWarning Opt_WarnDeprecations (getLoc $1) (text "_scc_ is deprecated; use an SCC pragma instead")) >>= \_ -> + (return $ LL $ getSTRING $2) } | '{-# SCC' STRING '#-}' { LL $ getSTRING $2 } hpc_annot :: { Located (FastString,(Int,Int),(Int,Int)) } @@ -1307,12 +1333,11 @@ fexp :: { LHsExpr RdrName } aexp :: { LHsExpr RdrName } : qvar '@' aexp { LL $ EAsPat $1 $3 } | '~' aexp { LL $ ELazyPat $2 } - | aexp1 { $1 } + | aexp1 { $1 } aexp1 :: { LHsExpr RdrName } - : aexp1 '{' fbinds '}' {% do { r <- mkRecConstrOrUpdate $1 (comb2 $2 $4) - (reverse $3); - return (LL r) }} + : aexp1 '{' fbinds '}' {% do { r <- mkRecConstrOrUpdate $1 (comb2 $2 $4) $3 + ; return (LL r) }} | aexp2 { $1 } -- Here was the syntax for type applications that I was planning @@ -1327,15 +1352,20 @@ aexp2 :: { LHsExpr RdrName } : ipvar { L1 (HsIPVar $! unLoc $1) } | qcname { L1 (HsVar $! unLoc $1) } | literal { L1 (HsLit $! unLoc $1) } - | INTEGER { L1 (HsOverLit $! mkHsIntegral (getINTEGER $1)) } - | RATIONAL { L1 (HsOverLit $! mkHsFractional (getRATIONAL $1)) } - | '(' exp ')' { LL (HsPar $2) } +-- This will enable overloaded strings permanently. Normally the renamer turns HsString +-- into HsOverLit when -foverloaded-strings is on. +-- | STRING { sL (getLoc $1) (HsOverLit $! mkHsIsString (getSTRING $1) placeHolderType) } + | INTEGER { sL (getLoc $1) (HsOverLit $! mkHsIntegral (getINTEGER $1) placeHolderType) } + | RATIONAL { sL (getLoc $1) (HsOverLit $! mkHsFractional (getRATIONAL $1) placeHolderType) } + -- N.B.: sections get parsed by these next two productions. + -- This allows you to write, e.g., '(+ 3, 4 -)', which isn't correct Haskell98 + -- (you'd have to write '((+ 3), (4 -))') + -- but the less cluttered version fell out of having texps. + | '(' texp ')' { LL (HsPar $2) } | '(' texp ',' texps ')' { LL $ ExplicitTuple ($2 : reverse $4) Boxed } | '(#' texps '#)' { LL $ ExplicitTuple (reverse $2) Unboxed } | '[' list ']' { LL (unLoc $2) } | '[:' parr ':]' { LL (unLoc $2) } - | '(' infixexp qop ')' { LL $ SectionL $2 $3 } - | '(' qopm infixexp ')' { LL $ SectionR $2 $3 } | '_' { L1 EWildPat } -- Template Haskell Extension @@ -1344,6 +1374,11 @@ aexp2 :: { LHsExpr RdrName } (getTH_ID_SPLICE $1)))) } -- $x | '$(' exp ')' { LL $ HsSpliceE (mkHsSplice $2) } -- $( exp ) + | TH_QUASIQUOTE { let { loc = getLoc $1 + ; ITquasiQuote (quoter, quote, quoteSpan) = unLoc $1 + ; quoterId = mkUnqual varName quoter + } + in sL loc $ HsQuasiQuoteE (mkHsQuasiQuote quoterId quoteSpan quote) } | TH_VAR_QUOTE qvar { LL $ HsBracket (VarBr (unLoc $2)) } | TH_VAR_QUOTE qcon { LL $ HsBracket (VarBr (unLoc $2)) } | TH_TY_QUOTE tyvar { LL $ HsBracket (VarBr (unLoc $2)) } @@ -1351,8 +1386,9 @@ aexp2 :: { LHsExpr RdrName } | '[|' exp '|]' { LL $ HsBracket (ExpBr $2) } | '[t|' ctype '|]' { LL $ HsBracket (TypBr $2) } | '[p|' infixexp '|]' {% checkPattern $2 >>= \p -> - return (LL $ HsBracket (PatBr p)) } - | '[d|' cvtopbody '|]' { LL $ HsBracket (DecBr (mkGroup $2)) } + return (LL $ HsBracket (PatBr p)) } + | '[d|' cvtopbody '|]' {% checkDecBrGroup $2 >>= \g -> + return (LL $ HsBracket (DecBr g)) } -- arrow notation extension | '(|' aexp2 cmdargs '|)' { LL $ HsArrForm $2 Nothing (reverse $3) } @@ -1372,11 +1408,17 @@ cvtopdecls0 :: { [LHsDecl RdrName] } : {- empty -} { [] } | cvtopdecls { $1 } +-- tuple expressions: things that can appear unparenthesized as long as they're +-- inside parens or delimitted by commas texp :: { LHsExpr RdrName } : exp { $1 } - | qopm infixexp { LL $ SectionR $1 $2 } - -- The second production is really here only for bang patterns - -- but + -- Technically, this should only be used for bang patterns, + -- but we can be a little more liberal here and avoid parens + -- inside tuples + | infixexp qop { LL $ SectionL $1 $2 } + | qopm infixexp { LL $ SectionR $1 $2 } + -- view patterns get parenthesized above + | exp '->' exp { LL $ EViewPat $1 $3 } texps :: { [LHsExpr RdrName] } : texps ',' texp { $3 : $1 } @@ -1396,7 +1438,7 @@ list :: { LHsExpr RdrName } | texp ',' exp '..' { LL $ ArithSeq noPostTcExpr (FromThen $1 $3) } | texp '..' exp { LL $ ArithSeq noPostTcExpr (FromTo $1 $3) } | texp ',' exp '..' exp { LL $ ArithSeq noPostTcExpr (FromThenTo $1 $3 $5) } - | texp pquals { sL (comb2 $1 $>) $ mkHsDo ListComp (reverse (unLoc $2)) $1 } + | texp '|' flattenedpquals { sL (comb2 $1 $>) $ mkHsDo ListComp (unLoc $3) $1 } lexps :: { Located [LHsExpr RdrName] } : lexps ',' texp { LL ($3 : unLoc $1) } @@ -1405,23 +1447,50 @@ lexps :: { Located [LHsExpr RdrName] } ----------------------------------------------------------------------------- -- List Comprehensions -pquals :: { Located [LStmt RdrName] } -- Either a singleton ParStmt, - -- or a reversed list of Stmts - : pquals1 { case unLoc $1 of - [qs] -> L1 qs - qss -> L1 [L1 (ParStmt stmtss)] - where - stmtss = [ (reverse qs, undefined) - | qs <- qss ] - } - +flattenedpquals :: { Located [LStmt RdrName] } + : pquals { case (unLoc $1) of + ParStmt [(qs, _)] -> L1 qs + -- We just had one thing in our "parallel" list so + -- we simply return that thing directly + + _ -> L1 [$1] + -- We actually found some actual parallel lists so + -- we leave them into as a ParStmt + } + +pquals :: { LStmt RdrName } + : pquals1 { L1 (ParStmt [(qs, undefined) | qs <- (reverse (unLoc $1))]) } + pquals1 :: { Located [[LStmt RdrName]] } - : pquals1 '|' quals { LL (unLoc $3 : unLoc $1) } - | '|' quals { L (getLoc $2) [unLoc $2] } + : pquals1 '|' squals { LL (unLoc $3 : unLoc $1) } + | squals { L (getLoc $1) [unLoc $1] } + +squals :: { Located [LStmt RdrName] } + : squals1 { L (getLoc $1) (reverse (unLoc $1)) } -quals :: { Located [LStmt RdrName] } - : quals ',' qual { LL ($3 : unLoc $1) } - | qual { L1 [$1] } +squals1 :: { Located [LStmt RdrName] } + : transformquals1 { LL (unLoc $1) } + +transformquals1 :: { Located [LStmt RdrName] } + : transformquals1 ',' transformqual { LL $ [LL ((unLoc $3) (unLoc $1))] } + | transformquals1 ',' qual { LL ($3 : unLoc $1) } +-- | transformquals1 ',' '{|' pquals '|}' { LL ($4 : unLoc $1) } + | transformqual { LL $ [LL ((unLoc $1) [])] } + | qual { L1 [$1] } +-- | '{|' pquals '|}' { L1 [$2] } + + +-- It is possible to enable bracketing (associating) qualifier lists by uncommenting the lines with {| |} +-- above. Due to a lack of consensus on the syntax, this feature is not being used until we get user +-- demand. Note that the {| |} symbols are reused from -XGenerics and hence if you want to compile +-- a program that makes use of this temporary syntax you must supply that flag to GHC + +transformqual :: { Located ([LStmt RdrName] -> Stmt RdrName) } + : 'then' exp { LL $ \leftStmts -> (mkTransformStmt (reverse leftStmts) $2) } + | 'then' exp 'by' exp { LL $ \leftStmts -> (mkTransformByStmt (reverse leftStmts) $2 $4) } + | 'then' 'group' 'by' exp { LL $ \leftStmts -> (mkGroupByStmt (reverse leftStmts) $4) } + | 'then' 'group' 'using' exp { LL $ \leftStmts -> (mkGroupUsingStmt (reverse leftStmts) $4) } + | 'then' 'group' 'by' exp 'using' exp { LL $ \leftStmts -> (mkGroupByUsingStmt (reverse leftStmts) $4 $6) } ----------------------------------------------------------------------------- -- Parallel array expressions @@ -1433,14 +1502,24 @@ quals :: { Located [LStmt RdrName] } parr :: { LHsExpr RdrName } : { noLoc (ExplicitPArr placeHolderType []) } - | exp { L1 $ ExplicitPArr placeHolderType [$1] } + | texp { L1 $ ExplicitPArr placeHolderType [$1] } | lexps { L1 $ ExplicitPArr placeHolderType (reverse (unLoc $1)) } - | exp '..' exp { LL $ PArrSeq noPostTcExpr (FromTo $1 $3) } - | exp ',' exp '..' exp { LL $ PArrSeq noPostTcExpr (FromThenTo $1 $3 $5) } - | exp pquals { sL (comb2 $1 $>) $ mkHsDo PArrComp (reverse (unLoc $2)) $1 } + | texp '..' exp { LL $ PArrSeq noPostTcExpr (FromTo $1 $3) } + | texp ',' exp '..' exp { LL $ PArrSeq noPostTcExpr (FromThenTo $1 $3 $5) } + | texp '|' flattenedpquals { LL $ mkHsDo PArrComp (unLoc $3) $1 } + +-- We are reusing `lexps' and `flattenedpquals' from the list case. --- We are reusing `lexps' and `pquals' from the list case. +----------------------------------------------------------------------------- +-- Guards + +guardquals :: { Located [LStmt RdrName] } + : guardquals1 { L (getLoc $1) (reverse (unLoc $1)) } + +guardquals1 :: { Located [LStmt RdrName] } + : guardquals1 ',' qual { LL ($3 : unLoc $1) } + | qual { L1 [$1] } ----------------------------------------------------------------------------- -- Case alternatives @@ -1473,14 +1552,14 @@ gdpats :: { Located [LGRHS RdrName] } | gdpat { L1 [$1] } gdpat :: { LGRHS RdrName } - : '|' quals '->' exp { sL (comb2 $1 $>) $ GRHS (reverse (unLoc $2)) $4 } + : '|' guardquals '->' exp { sL (comb2 $1 $>) $ GRHS (unLoc $2) $4 } -- 'pat' recognises a pattern, including one with a bang at the top -- e.g. "!x" or "!(x,y)" or "C a b" etc -- Bangs inside are parsed as infix operator applications, so that -- we parse them right when bang-patterns are off pat :: { LPat RdrName } -pat : infixexp {% checkPattern $1 } +pat : exp {% checkPattern $1 } | '!' aexp {% checkPattern (LL (SectionR (L1 (HsVar bang_RDR)) $2)) } apat :: { LPat RdrName } @@ -1519,38 +1598,41 @@ maybe_stmt :: { Maybe (LStmt RdrName) } | {- nothing -} { Nothing } stmt :: { LStmt RdrName } - : qual { $1 } --- What is this next production doing? I have no clue! SLPJ Dec06 - | infixexp '->' exp {% checkPattern $3 >>= \p -> - return (LL $ mkBindStmt p $1) } + : qual { $1 } | 'rec' stmtlist { LL $ mkRecStmt (unLoc $2) } qual :: { LStmt RdrName } - : pat '<-' exp { LL $ mkBindStmt $1 $3 } - | exp { L1 $ mkExprStmt $1 } - | 'let' binds { LL $ LetStmt (unLoc $2) } + : pat '<-' exp { LL $ mkBindStmt $1 $3 } + | exp { L1 $ mkExprStmt $1 } + | 'let' binds { LL $ LetStmt (unLoc $2) } ----------------------------------------------------------------------------- -- Record Field Update/Construction -fbinds :: { HsRecordBinds RdrName } +fbinds :: { ([HsRecField RdrName (LHsExpr RdrName)], Bool) } : fbinds1 { $1 } - | {- empty -} { [] } + | {- empty -} { ([], False) } -fbinds1 :: { HsRecordBinds RdrName } - : fbinds1 ',' fbind { $3 : $1 } - | fbind { [$1] } +fbinds1 :: { ([HsRecField RdrName (LHsExpr RdrName)], Bool) } + : fbind ',' fbinds1 { case $3 of (flds, dd) -> ($1 : flds, dd) } + | fbind { ([$1], False) } + | '..' { ([], True) } -fbind :: { (Located RdrName, LHsExpr RdrName) } - : qvar '=' exp { ($1,$3) } +fbind :: { HsRecField RdrName (LHsExpr RdrName) } + : qvar '=' exp { HsRecField $1 $3 False } + | qvar { HsRecField $1 (L (getLoc $1) (HsVar (unLoc $1))) True } + -- Here's where we say that plain 'x' + -- means exactly 'x = x'. The pun-flag boolean is + -- there so we can still print it right ----------------------------------------------------------------------------- -- Implicit Parameter Bindings dbinds :: { Located [LIPBind RdrName] } - : dbinds ';' dbind { LL ($3 : unLoc $1) } + : dbinds ';' dbind { let { this = $3; rest = unLoc $1 } + in rest `seq` this `seq` LL (this : rest) } | dbinds ';' { LL (unLoc $1) } - | dbind { L1 [$1] } + | dbind { let this = $1 in this `seq` L1 [this] } -- | {- empty -} { [] } dbind :: { LIPBind RdrName } @@ -1586,6 +1668,8 @@ con :: { Located RdrName } sysdcon :: { Located DataCon } -- Wired in data constructors : '(' ')' { LL unitDataCon } | '(' commas ')' { LL $ tupleCon Boxed $2 } + | '(#' '#)' { LL $ unboxedSingletonDataCon } + | '(#' commas '#)' { LL $ tupleCon Unboxed $2 } | '[' ']' { LL nilDataCon } conop :: { Located RdrName } @@ -1603,6 +1687,8 @@ gtycon :: { Located RdrName } -- A "general" qualified tycon : oqtycon { $1 } | '(' ')' { LL $ getRdrName unitTyCon } | '(' commas ')' { LL $ getRdrName (tupleTyCon Boxed $2) } + | '(#' '#)' { LL $ getRdrName unboxedSingletonTyCon } + | '(#' commas '#)' { LL $ getRdrName (tupleTyCon Unboxed $2) } | '(' '->' ')' { LL $ getRdrName funTyCon } | '[' ']' { LL $ listTyCon_RDR } | '[:' ':]' { LL $ parrTyCon_RDR } @@ -1709,7 +1795,6 @@ varid_no_unsafe :: { Located RdrName } : VARID { L1 $! mkUnqual varName (getVARID $1) } | special_id { L1 $! mkUnqual varName (unLoc $1) } | 'forall' { L1 $! mkUnqual varName FSLIT("forall") } - | 'iso' { L1 $! mkUnqual varName FSLIT("iso") } | 'family' { L1 $! mkUnqual varName FSLIT("family") } qvarsym :: { Located RdrName } @@ -1734,14 +1819,13 @@ varsym_no_minus :: { Located RdrName } -- varsym not including '-' -- These special_ids are treated as keywords in various places, -- but as ordinary ids elsewhere. 'special_id' collects all these --- except 'unsafe', 'forall', 'family', and 'iso' whose treatment differs +-- except 'unsafe', 'forall', and 'family' whose treatment differs -- depending on context special_id :: { Located FastString } special_id : 'as' { L1 FSLIT("as") } | 'qualified' { L1 FSLIT("qualified") } | 'hiding' { L1 FSLIT("hiding") } - | 'for' { L1 FSLIT("for") } | 'export' { L1 FSLIT("export") } | 'label' { L1 FSLIT("label") } | 'dynamic' { L1 FSLIT("dynamic") } @@ -1779,7 +1863,7 @@ consym :: { Located RdrName } literal :: { Located HsLit } : CHAR { L1 $ HsChar $ getCHAR $1 } - | STRING { L1 $ HsString $ getSTRING $1 } + | STRING { L1 $ HsString $ getSTRING $1 } | PRIMINTEGER { L1 $ HsIntPrim $ getPRIMINTEGER $1 } | PRIMCHAR { L1 $ HsCharPrim $ getPRIMCHAR $1 } | PRIMSTRING { L1 $ HsStringPrim $ getPRIMSTRING $1 } @@ -1813,38 +1897,35 @@ commas :: { Int } docnext :: { LHsDoc RdrName } : DOCNEXT {% case parseHaddockParagraphs (tokenise (getDOCNEXT $1)) of { - Left err -> parseError (getLoc $1) err; - Right doc -> return (L1 doc) } } + MyLeft err -> parseError (getLoc $1) err; + MyRight doc -> return (L1 doc) } } docprev :: { LHsDoc RdrName } : DOCPREV {% case parseHaddockParagraphs (tokenise (getDOCPREV $1)) of { - Left err -> parseError (getLoc $1) err; - Right doc -> return (L1 doc) } } + MyLeft err -> parseError (getLoc $1) err; + MyRight doc -> return (L1 doc) } } docnamed :: { Located (String, (HsDoc RdrName)) } : DOCNAMED {% let string = getDOCNAMED $1 (name, rest) = break isSpace string in case parseHaddockParagraphs (tokenise rest) of { - Left err -> parseError (getLoc $1) err; - Right doc -> return (L1 (name, doc)) } } + MyLeft err -> parseError (getLoc $1) err; + MyRight doc -> return (L1 (name, doc)) } } -docsection :: { Located (n, HsDoc RdrName) } +docsection :: { Located (Int, HsDoc RdrName) } : DOCSECTION {% let (n, doc) = getDOCSECTION $1 in case parseHaddockString (tokenise doc) of { - Left err -> parseError (getLoc $1) err; - Right doc -> return (L1 (n, doc)) } } - -docoptions :: { String } - : DOCOPTIONS { getDOCOPTIONS $1 } + MyLeft err -> parseError (getLoc $1) err; + MyRight doc -> return (L1 (n, doc)) } } moduleheader :: { (HaddockModInfo RdrName, Maybe (HsDoc RdrName)) } : DOCNEXT {% let string = getDOCNEXT $1 in case parseModuleHeader string of { Right (str, info) -> case parseHaddockParagraphs (tokenise str) of { - Left err -> parseError (getLoc $1) err; - Right doc -> return (info, Just doc); + MyLeft err -> parseError (getLoc $1) err; + MyRight doc -> return (info, Just doc); }; Left err -> parseError (getLoc $1) err } } @@ -1887,7 +1968,6 @@ getDOCNEXT (L _ (ITdocCommentNext x)) = x getDOCPREV (L _ (ITdocCommentPrev x)) = x getDOCNAMED (L _ (ITdocCommentNamed x)) = x getDOCSECTION (L _ (ITdocSection n x)) = (n, x) -getDOCOPTIONS (L _ (ITdocOptions x)) = x -- Utilities for combining source spans comb2 :: Located a -> Located b -> SrcSpan @@ -1903,7 +1983,7 @@ comb4 a b c d = combineSrcSpans (getLoc a) $ combineSrcSpans (getLoc b) $ -- strict constructor version: {-# INLINE sL #-} sL :: SrcSpan -> a -> Located a -sL span a = span `seq` L span a +sL span a = span `seq` a `seq` L span a -- Make a source location for the file. We're a bit lazy here and just -- make a point SrcSpan at line 1, column 0. Strictly speaking we should