{- -*-haskell-*- ----------------------------------------------------------------------------- $Id: Parser.y,v 1.131 2003/11/27 13:26:39 simonmar Exp $ Haskell grammar. Author(s): Simon Marlow, Sven Panne 1997, 1998, 1999 ----------------------------------------------------------------------------- -} { module Parser ( parseModule, parseStmt, parseIdentifier, parseIface ) where #include "HsVersions.h" import HsSyn import RdrHsSyn import HscTypes ( ModIface, IsBootInterface, DeprecTxt ) import Lexer import RdrName import TysWiredIn ( unitTyCon, unitDataCon, tupleTyCon, tupleCon, nilDataCon, listTyCon_RDR, parrTyCon_RDR, consDataCon_RDR ) import Type ( funTyCon ) import ForeignCall ( Safety(..), CExportSpec(..), CCallConv(..), CCallTarget(..), defaultCCallConv ) import OccName ( UserFS, varName, dataName, tcClsName, tvName ) import DataCon ( DataCon, dataConName ) import SrcLoc ( SrcLoc, noSrcLoc ) import Module import CmdLineOpts ( opt_SccProfilingOn ) import Type ( Kind, mkArrowKind, liftedTypeKind ) import BasicTypes ( Boxity(..), Fixity(..), FixityDirection(..), IPName(..), NewOrData(..), Activation(..) ) import Panic import GLAEXTS import CStrings ( CLabelString ) import FastString import Maybes ( orElse ) import Outputable import Char ( ord ) } {- ----------------------------------------------------------------------------- Conflicts: 29 shift/reduce, [SDM 19/9/2002] 10 for abiguity in 'if x then y else z + 1' [State 136] (shift parses as 'if x then y else (z + 1)', as per longest-parse rule) 10 because op might be: : - ! * . `x` VARSYM CONSYM QVARSYM QCONSYM 1 for ambiguity in 'if x then y else z with ?x=3' [State 136] (shift parses as 'if x then y else (z with ?x=3)' 1 for ambiguity in 'if x then y else z :: T' [State 136] (shift parses as 'if x then y else (z :: T)', as per longest-parse rule) 8 for ambiguity in 'e :: a `b` c'. Does this mean [States 160,246] (e::a) `b` c, or (e :: (a `b` c)) 1 for ambiguity in 'let ?x ...' [State 268] the parser can't tell whether the ?x is the lhs of a normal binding or an implicit binding. Fortunately resolving as shift gives it the only sensible meaning, namely the lhs of an implicit binding. 1 for ambiguity in '{-# RULES "name" [ ... #-} [State 332] we don't know whether the '[' starts the activation or not: it might be the start of the declaration with the activation being empty. --SDM 1/4/2002 1 for ambiguity in '{-# RULES "name" forall = ... #-}' [State 394] since 'forall' is a valid variable name, we don't know whether to treat a forall on the input as the beginning of a quantifier or the beginning of the rule itself. Resolving to shift means it's always treated as a quantifier, hence the above is disallowed. This saves explicitly defining a grammar for the rule lhs that doesn't include 'forall'. 6 for conflicts between `fdecl' and `fdeclDEPRECATED', [States 384,385] which are resolved correctly, and moreover, should go away when `fdeclDEPRECATED' is removed. ----------------------------------------------------------------------------- -} %token '_' { T _ _ ITunderscore } -- Haskell keywords 'as' { T _ _ ITas } 'case' { T _ _ ITcase } 'class' { T _ _ ITclass } 'data' { T _ _ ITdata } 'default' { T _ _ ITdefault } 'deriving' { T _ _ ITderiving } 'do' { T _ _ ITdo } 'else' { T _ _ ITelse } 'hiding' { T _ _ IThiding } 'if' { T _ _ ITif } 'import' { T _ _ ITimport } 'in' { T _ _ ITin } 'infix' { T _ _ ITinfix } 'infixl' { T _ _ ITinfixl } 'infixr' { T _ _ ITinfixr } 'instance' { T _ _ ITinstance } 'let' { T _ _ ITlet } 'module' { T _ _ ITmodule } 'newtype' { T _ _ ITnewtype } 'of' { T _ _ ITof } 'qualified' { T _ _ ITqualified } 'then' { T _ _ ITthen } 'type' { T _ _ ITtype } 'where' { T _ _ ITwhere } '_scc_' { T _ _ ITscc } -- ToDo: remove 'forall' { T _ _ ITforall } -- GHC extension keywords 'foreign' { T _ _ ITforeign } 'export' { T _ _ ITexport } 'label' { T _ _ ITlabel } 'dynamic' { T _ _ ITdynamic } 'safe' { T _ _ ITsafe } 'threadsafe' { T _ _ ITthreadsafe } 'unsafe' { T _ _ ITunsafe } 'mdo' { T _ _ ITmdo } 'stdcall' { T _ _ ITstdcallconv } 'ccall' { T _ _ ITccallconv } 'dotnet' { T _ _ ITdotnet } 'proc' { T _ _ ITproc } -- for arrow notation extension 'rec' { T _ _ ITrec } -- for arrow notation extension '{-# SPECIALISE' { T _ _ ITspecialise_prag } '{-# SOURCE' { T _ _ ITsource_prag } '{-# INLINE' { T _ _ ITinline_prag } '{-# NOINLINE' { T _ _ ITnoinline_prag } '{-# RULES' { T _ _ ITrules_prag } '{-# CORE' { T _ _ ITcore_prag } -- hdaume: annotated core '{-# SCC' { T _ _ ITscc_prag } '{-# DEPRECATED' { T _ _ ITdeprecated_prag } '{-# UNPACK' { T _ _ ITunpack_prag } '#-}' { T _ _ ITclose_prag } '..' { T _ _ ITdotdot } -- reserved symbols ':' { T _ _ ITcolon } '::' { T _ _ ITdcolon } '=' { T _ _ ITequal } '\\' { T _ _ ITlam } '|' { T _ _ ITvbar } '<-' { T _ _ ITlarrow } '->' { T _ _ ITrarrow } '@' { T _ _ ITat } '~' { T _ _ ITtilde } '=>' { T _ _ ITdarrow } '-' { T _ _ ITminus } '!' { T _ _ ITbang } '*' { T _ _ ITstar } '-<' { T _ _ ITlarrowtail } -- for arrow notation '>-' { T _ _ ITrarrowtail } -- for arrow notation '-<<' { T _ _ ITLarrowtail } -- for arrow notation '>>-' { T _ _ ITRarrowtail } -- for arrow notation '.' { T _ _ ITdot } '{' { T _ _ ITocurly } -- special symbols '}' { T _ _ ITccurly } '{|' { T _ _ ITocurlybar } '|}' { T _ _ ITccurlybar } vocurly { T _ _ ITvocurly } -- virtual open curly (from layout) vccurly { T _ _ ITvccurly } -- virtual close curly (from layout) '[' { T _ _ ITobrack } ']' { T _ _ ITcbrack } '[:' { T _ _ ITopabrack } ':]' { T _ _ ITcpabrack } '(' { T _ _ IToparen } ')' { T _ _ ITcparen } '(#' { T _ _ IToubxparen } '#)' { T _ _ ITcubxparen } '(|' { T _ _ IToparenbar } '|)' { T _ _ ITcparenbar } ';' { T _ _ ITsemi } ',' { T _ _ ITcomma } '`' { T _ _ ITbackquote } VARID { T _ _ (ITvarid $$) } -- identifiers CONID { T _ _ (ITconid $$) } VARSYM { T _ _ (ITvarsym $$) } CONSYM { T _ _ (ITconsym $$) } QVARID { T _ _ (ITqvarid $$) } QCONID { T _ _ (ITqconid $$) } QVARSYM { T _ _ (ITqvarsym $$) } QCONSYM { T _ _ (ITqconsym $$) } IPDUPVARID { T _ _ (ITdupipvarid $$) } -- GHC extension IPSPLITVARID { T _ _ (ITsplitipvarid $$) } -- GHC extension CHAR { T _ _ (ITchar $$) } STRING { T _ _ (ITstring $$) } INTEGER { T _ _ (ITinteger $$) } RATIONAL { T _ _ (ITrational $$) } PRIMCHAR { T _ _ (ITprimchar $$) } PRIMSTRING { T _ _ (ITprimstring $$) } PRIMINTEGER { T _ _ (ITprimint $$) } PRIMFLOAT { T _ _ (ITprimfloat $$) } PRIMDOUBLE { T _ _ (ITprimdouble $$) } -- Template Haskell '[|' { T _ _ ITopenExpQuote } '[p|' { T _ _ ITopenPatQuote } '[t|' { T _ _ ITopenTypQuote } '[d|' { T _ _ ITopenDecQuote } '|]' { T _ _ ITcloseQuote } TH_ID_SPLICE { T _ _ (ITidEscape $$) } -- $x '$(' { T _ _ ITparenEscape } -- $( exp ) TH_VAR_QUOTE { T _ _ ITvarQuote } -- 'x TH_TY_QUOTE { T _ _ ITtyQuote } -- ''T %monad { P } { >>= } { return } %lexer { lexer } { T _ _ ITeof } %name parseModule module %name parseStmt maybe_stmt %name parseIdentifier identifier %name parseIface iface %tokentype { Token } %% ----------------------------------------------------------------------------- -- Module Header -- The place for module deprecation is really too restrictive, but if it -- was allowed at its natural place just before 'module', we get an ugly -- s/r conflict with the second alternative. Another solution would be the -- introduction of a new pragma DEPRECATED_MODULE, but this is not very nice, -- either, and DEPRECATED is only expected to be used by people who really -- know what they are doing. :-) module :: { RdrNameHsModule } : srcloc 'module' modid maybemoddeprec maybeexports 'where' body { HsModule (Just (mkHomeModule $3)) $5 (fst $7) (snd $7) $4 $1 } | srcloc missing_module_keyword top close { HsModule Nothing Nothing (fst $3) (snd $3) Nothing $1 } missing_module_keyword :: { () } : {- empty -} {% pushCurrentContext } maybemoddeprec :: { Maybe DeprecTxt } : '{-# DEPRECATED' STRING '#-}' { Just $2 } | {- empty -} { Nothing } body :: { ([RdrNameImportDecl], [RdrNameHsDecl]) } : '{' top '}' { $2 } | vocurly top close { $2 } top :: { ([RdrNameImportDecl], [RdrNameHsDecl]) } : importdecls { (reverse $1,[]) } | importdecls ';' cvtopdecls { (reverse $1,$3) } | cvtopdecls { ([],$1) } cvtopdecls :: { [RdrNameHsDecl] } : topdecls { cvTopDecls $1 } ----------------------------------------------------------------------------- -- Interfaces (.hi-boot files) iface :: { ModIface } : 'module' modid 'where' ifacebody { mkBootIface $2 $4 } ifacebody :: { [HsDecl RdrName] } : '{' ifacedecls '}' { $2 } | vocurly ifacedecls close { $2 } ifacedecls :: { [HsDecl RdrName] } : ifacedecl ';' ifacedecls { $1 : $3 } | ';' ifacedecls { $2 } | ifacedecl { [$1] } | {- empty -} { [] } ifacedecl :: { HsDecl RdrName } : var '::' sigtype { SigD (Sig $1 $3 noSrcLoc) } | 'type' syn_hdr '=' ctype { let (tc,tvs) = $2 in TyClD (TySynonym tc tvs $4 noSrcLoc) } | new_or_data tycl_hdr { TyClD (mkTyData $1 $2 [] Nothing noSrcLoc) } | 'class' tycl_hdr fds { TyClD (mkClassDecl $2 $3 [] EmptyMonoBinds noSrcLoc) } new_or_data :: { NewOrData } : 'data' { DataType } | 'newtype' { NewType } ----------------------------------------------------------------------------- -- The Export List maybeexports :: { Maybe [RdrNameIE] } : '(' exportlist ')' { Just $2 } | {- empty -} { Nothing } exportlist :: { [RdrNameIE] } : exportlist ',' export { $3 : $1 } | exportlist ',' { $1 } | export { [$1] } | {- empty -} { [] } -- No longer allow things like [] and (,,,) to be exported -- They are built in syntax, always available export :: { RdrNameIE } : qvar { IEVar $1 } | oqtycon { IEThingAbs $1 } | oqtycon '(' '..' ')' { IEThingAll $1 } | oqtycon '(' ')' { IEThingWith $1 [] } | oqtycon '(' qcnames ')' { IEThingWith $1 (reverse $3) } | 'module' modid { IEModuleContents $2 } qcnames :: { [RdrName] } : qcnames ',' qcname { $3 : $1 } | qcname { [$1] } qcname :: { RdrName } -- Variable or data constructor : qvar { $1 } | gcon { $1 } ----------------------------------------------------------------------------- -- Import Declarations -- import decls can be *empty*, or even just a string of semicolons -- whereas topdecls must contain at least one topdecl. importdecls :: { [RdrNameImportDecl] } : importdecls ';' importdecl { $3 : $1 } | importdecls ';' { $1 } | importdecl { [ $1 ] } | {- empty -} { [] } importdecl :: { RdrNameImportDecl } : 'import' srcloc maybe_src optqualified modid maybeas maybeimpspec { ImportDecl $5 $3 $4 $6 $7 $2 } maybe_src :: { IsBootInterface } : '{-# SOURCE' '#-}' { True } | {- empty -} { False } optqualified :: { Bool } : 'qualified' { True } | {- empty -} { False } maybeas :: { Maybe ModuleName } : 'as' modid { Just $2 } | {- empty -} { Nothing } maybeimpspec :: { Maybe (Bool, [RdrNameIE]) } : impspec { Just $1 } | {- empty -} { Nothing } impspec :: { (Bool, [RdrNameIE]) } : '(' exportlist ')' { (False, reverse $2) } | 'hiding' '(' exportlist ')' { (True, reverse $3) } ----------------------------------------------------------------------------- -- Fixity Declarations prec :: { Int } : {- empty -} { 9 } | INTEGER {% checkPrecP (fromInteger $1) } infix :: { FixityDirection } : 'infix' { InfixN } | 'infixl' { InfixL } | 'infixr' { InfixR } ops :: { [RdrName] } : ops ',' op { $3 : $1 } | op { [$1] } ----------------------------------------------------------------------------- -- Top-Level Declarations topdecls :: { [RdrBinding] } -- Reversed : topdecls ';' topdecl { $3 : $1 } | topdecls ';' { $1 } | topdecl { [$1] } topdecl :: { RdrBinding } : tycl_decl { RdrHsDecl (TyClD $1) } | srcloc 'instance' inst_type where { let (binds,sigs) = cvMonoBindsAndSigs $4 in RdrHsDecl (InstD (InstDecl $3 binds sigs $1)) } | srcloc 'default' '(' comma_types0 ')' { RdrHsDecl (DefD (DefaultDecl $4 $1)) } | 'foreign' fdecl { RdrHsDecl $2 } | '{-# DEPRECATED' deprecations '#-}' { RdrBindings (reverse $2) } | '{-# RULES' rules '#-}' { RdrBindings (reverse $2) } | srcloc '$(' exp ')' { RdrHsDecl (SpliceD (SpliceDecl $3 $1)) } | decl { $1 } tycl_decl :: { RdrNameTyClDecl } : srcloc 'type' syn_hdr '=' ctype -- Note ctype, not sigtype. -- We allow an explicit for-all but we don't insert one -- in type Foo a = (b,b) -- Instead we just say b is out of scope { let (tc,tvs) = $3 in TySynonym tc tvs $5 $1 } | srcloc 'data' tycl_hdr constrs deriving { mkTyData DataType $3 (reverse $4) $5 $1 } | srcloc 'newtype' tycl_hdr '=' newconstr deriving { mkTyData NewType $3 [$5] $6 $1 } | srcloc 'class' tycl_hdr fds where { let (binds,sigs) = cvMonoBindsAndSigs $5 in mkClassDecl $3 $4 sigs binds $1 } syn_hdr :: { (RdrName, [RdrNameHsTyVar]) } -- We don't retain the syntax of an infix -- type synonym declaration. Oh well. : tycon tv_bndrs { ($1, $2) } | tv_bndr tyconop tv_bndr { ($2, [$1,$3]) } -- tycl_hdr parses the header of a type or class decl, -- which takes the form -- T a b -- Eq a => T a -- (Eq a, Ord b) => T a b -- Rather a lot of inlining here, else we get reduce/reduce errors tycl_hdr :: { (RdrNameContext, RdrName, [RdrNameHsTyVar]) } : context '=>' type {% checkTyClHdr $1 $3 } | type {% checkTyClHdr [] $1 } ----------------------------------------------------------------------------- -- Nested declarations decls :: { [RdrBinding] } -- Reversed : decls ';' decl { $3 : $1 } | decls ';' { $1 } | decl { [$1] } | {- empty -} { [] } decllist :: { [RdrBinding] } -- Reversed : '{' decls '}' { $2 } | vocurly decls close { $2 } where :: { [RdrBinding] } -- Reversed -- No implicit parameters : 'where' decllist { $2 } | {- empty -} { [] } binds :: { RdrNameHsBinds } -- May have implicit parameters : decllist { cvBinds $1 } | '{' dbinds '}' { IPBinds $2 } | vocurly dbinds close { IPBinds $2 } wherebinds :: { RdrNameHsBinds } -- May have implicit parameters : 'where' binds { $2 } | {- empty -} { EmptyBinds } ----------------------------------------------------------------------------- -- Transformation Rules rules :: { [RdrBinding] } -- Reversed : rules ';' rule { $3 : $1 } | rules ';' { $1 } | rule { [$1] } | {- empty -} { [] } rule :: { RdrBinding } : STRING activation rule_forall infixexp '=' srcloc exp { RdrHsDecl (RuleD (HsRule $1 $2 $3 $4 $7 $6)) } activation :: { Activation } -- Omitted means AlwaysActive : {- empty -} { AlwaysActive } | explicit_activation { $1 } inverse_activation :: { Activation } -- Omitted means NeverActive : {- empty -} { NeverActive } | explicit_activation { $1 } explicit_activation :: { Activation } -- In brackets : '[' INTEGER ']' { ActiveAfter (fromInteger $2) } | '[' '~' INTEGER ']' { ActiveBefore (fromInteger $3) } rule_forall :: { [RdrNameRuleBndr] } : 'forall' rule_var_list '.' { $2 } | {- empty -} { [] } rule_var_list :: { [RdrNameRuleBndr] } : rule_var { [$1] } | rule_var rule_var_list { $1 : $2 } rule_var :: { RdrNameRuleBndr } : varid { RuleBndr $1 } | '(' varid '::' ctype ')' { RuleBndrSig $2 $4 } ----------------------------------------------------------------------------- -- Deprecations (c.f. rules) deprecations :: { [RdrBinding] } -- Reversed : deprecations ';' deprecation { $3 : $1 } | deprecations ';' { $1 } | deprecation { [$1] } | {- empty -} { [] } -- SUP: TEMPORARY HACK, not checking for `module Foo' deprecation :: { RdrBinding } : srcloc depreclist STRING { RdrBindings [ RdrHsDecl (DeprecD (Deprecation n $3 $1)) | n <- $2 ] } ----------------------------------------------------------------------------- -- Foreign import and export declarations -- for the time being, the following accepts foreign declarations conforming -- to the FFI Addendum, Version 1.0 as well as pre-standard declarations -- -- * a flag indicates whether pre-standard declarations have been used and -- triggers a deprecation warning further down the road -- -- NB: The first two rules could be combined into one by replacing `safety1' -- with `safety'. However, the combined rule conflicts with the -- DEPRECATED rules. -- fdecl :: { RdrNameHsDecl } fdecl : srcloc 'import' callconv safety1 fspec {% mkImport $3 $4 $5 $1 } | srcloc 'import' callconv fspec {% mkImport $3 (PlaySafe False) $4 $1 } | srcloc 'export' callconv fspec {% mkExport $3 $4 $1 } -- the following syntax is DEPRECATED | srcloc fdecl1DEPRECATED { ForD ($2 True $1) } | srcloc fdecl2DEPRECATED { $2 $1 } fdecl1DEPRECATED :: { Bool -> SrcLoc -> ForeignDecl RdrName } fdecl1DEPRECATED ----------- DEPRECATED label decls ------------ : 'label' ext_name varid '::' sigtype { ForeignImport $3 $5 (CImport defaultCCallConv (PlaySafe False) nilFS nilFS (CLabel ($2 `orElse` mkExtName $3))) } ----------- DEPRECATED ccall/stdcall decls ------------ -- -- NB: This business with the case expression below may seem overly -- complicated, but it is necessary to avoid some conflicts. -- DEPRECATED variant #1: lack of a calling convention specification -- (import) | 'import' {-no callconv-} ext_name safety varid_no_unsafe '::' sigtype { let target = StaticTarget ($2 `orElse` mkExtName $4) in ForeignImport $4 $6 (CImport defaultCCallConv $3 nilFS nilFS (CFunction target)) } -- DEPRECATED variant #2: external name consists of two separate strings -- (module name and function name) (import) | 'import' callconv STRING STRING safety varid_no_unsafe '::' sigtype {% case $2 of DNCall -> parseError "Illegal format of .NET foreign import" CCall cconv -> return $ let imp = CFunction (StaticTarget $4) in ForeignImport $6 $8 (CImport cconv $5 nilFS nilFS imp) } -- DEPRECATED variant #3: `unsafe' after entity | 'import' callconv STRING 'unsafe' varid_no_unsafe '::' sigtype {% case $2 of DNCall -> parseError "Illegal format of .NET foreign import" CCall cconv -> return $ let imp = CFunction (StaticTarget $3) in ForeignImport $5 $7 (CImport cconv PlayRisky nilFS nilFS imp) } -- DEPRECATED variant #4: use of the special identifier `dynamic' without -- an explicit calling convention (import) | 'import' {-no callconv-} 'dynamic' safety varid_no_unsafe '::' sigtype { ForeignImport $4 $6 (CImport defaultCCallConv $3 nilFS nilFS (CFunction DynamicTarget)) } -- DEPRECATED variant #5: use of the special identifier `dynamic' (import) | 'import' callconv 'dynamic' safety varid_no_unsafe '::' sigtype {% case $2 of DNCall -> parseError "Illegal format of .NET foreign import" CCall cconv -> return $ ForeignImport $5 $7 (CImport cconv $4 nilFS nilFS (CFunction DynamicTarget)) } -- DEPRECATED variant #6: lack of a calling convention specification -- (export) | 'export' {-no callconv-} ext_name varid '::' sigtype { ForeignExport $3 $5 (CExport (CExportStatic ($2 `orElse` mkExtName $3) defaultCCallConv)) } -- DEPRECATED variant #7: external name consists of two separate strings -- (module name and function name) (export) | 'export' callconv STRING STRING varid '::' sigtype {% case $2 of DNCall -> parseError "Illegal format of .NET foreign import" CCall cconv -> return $ ForeignExport $5 $7 (CExport (CExportStatic $4 cconv)) } -- DEPRECATED variant #8: use of the special identifier `dynamic' without -- an explicit calling convention (export) | 'export' {-no callconv-} 'dynamic' varid '::' sigtype { ForeignImport $3 $5 (CImport defaultCCallConv (PlaySafe False) nilFS nilFS CWrapper) } -- DEPRECATED variant #9: use of the special identifier `dynamic' (export) | 'export' callconv 'dynamic' varid '::' sigtype {% case $2 of DNCall -> parseError "Illegal format of .NET foreign import" CCall cconv -> return $ ForeignImport $4 $6 (CImport cconv (PlaySafe False) nilFS nilFS CWrapper) } ----------- DEPRECATED .NET decls ------------ -- NB: removed the .NET call declaration, as it is entirely subsumed -- by the new standard FFI declarations fdecl2DEPRECATED :: { SrcLoc -> RdrNameHsDecl } fdecl2DEPRECATED : 'import' 'dotnet' 'type' ext_name tycon { \loc -> TyClD (ForeignType $5 $4 DNType loc) } -- left this one unchanged for the moment as type imports are not -- covered currently by the FFI standard -=chak callconv :: { CallConv } : 'stdcall' { CCall StdCallConv } | 'ccall' { CCall CCallConv } | 'dotnet' { DNCall } safety :: { Safety } : 'unsafe' { PlayRisky } | 'safe' { PlaySafe False } | 'threadsafe' { PlaySafe True } | {- empty -} { PlaySafe False } safety1 :: { Safety } : 'unsafe' { PlayRisky } | 'safe' { PlaySafe False } | 'threadsafe' { PlaySafe True } -- only needed to avoid conflicts with the DEPRECATED rules fspec :: { (FastString, RdrName, RdrNameHsType) } : STRING var '::' sigtype { ($1 , $2, $4) } | var '::' sigtype { (nilFS, $1, $3) } -- if the entity string is missing, it defaults to the empty string; -- the meaning of an empty entity string depends on the calling -- convention -- DEPRECATED syntax ext_name :: { Maybe CLabelString } : STRING { Just $1 } | STRING STRING { Just $2 } -- Ignore "module name" for now | {- empty -} { Nothing } ----------------------------------------------------------------------------- -- Type signatures opt_sig :: { Maybe RdrNameHsType } : {- empty -} { Nothing } | '::' sigtype { Just $2 } opt_asig :: { Maybe RdrNameHsType } : {- empty -} { Nothing } | '::' atype { Just $2 } sigtypes :: { [RdrNameHsType] } : sigtype { [ $1 ] } | sigtypes ',' sigtype { $3 : $1 } sigtype :: { RdrNameHsType } : ctype { mkImplicitHsForAllTy [] $1 } -- Wrap an Implicit forall if there isn't one there already sig_vars :: { [RdrName] } : sig_vars ',' var { $3 : $1 } | var { [ $1 ] } ----------------------------------------------------------------------------- -- Types -- A ctype is a for-all type ctype :: { RdrNameHsType } : 'forall' tv_bndrs '.' ctype { mkExplicitHsForAllTy $2 [] $4 } | context '=>' type { mkImplicitHsForAllTy $1 $3 } -- A type of form (context => type) is an *implicit* HsForAllTy | type { $1 } -- We parse a context as a btype so that we don't get reduce/reduce -- errors in ctype. The basic problem is that -- (Eq a, Ord a) -- looks so much like a tuple type. We can't tell until we find the => context :: { RdrNameContext } : btype {% checkContext $1 } type :: { RdrNameHsType } : ipvar '::' gentype { mkHsIParamTy $1 $3 } | gentype { $1 } gentype :: { RdrNameHsType } : btype { $1 } | btype qtyconop gentype { HsOpTy $1 $2 $3 } | btype '`' tyvar '`' gentype { HsOpTy $1 $3 $5 } | btype '->' gentype { HsFunTy $1 $3 } btype :: { RdrNameHsType } : btype atype { HsAppTy $1 $2 } | atype { $1 } atype :: { RdrNameHsType } : gtycon { HsTyVar $1 } | tyvar { HsTyVar $1 } | '(' type ',' comma_types1 ')' { HsTupleTy Boxed ($2:$4) } | '(#' comma_types1 '#)' { HsTupleTy Unboxed $2 } | '[' type ']' { HsListTy $2 } | '[:' type ':]' { HsPArrTy $2 } | '(' ctype ')' { HsParTy $2 } | '(' ctype '::' kind ')' { HsKindSig $2 $4 } -- Generics | INTEGER { HsNumTy $1 } -- An inst_type is what occurs in the head of an instance decl -- e.g. (Foo a, Gaz b) => Wibble a b -- It's kept as a single type, with a MonoDictTy at the right -- hand corner, for convenience. inst_type :: { RdrNameHsType } : ctype {% checkInstType $1 } comma_types0 :: { [RdrNameHsType] } : comma_types1 { $1 } | {- empty -} { [] } comma_types1 :: { [RdrNameHsType] } : type { [$1] } | type ',' comma_types1 { $1 : $3 } tv_bndrs :: { [RdrNameHsTyVar] } : tv_bndr tv_bndrs { $1 : $2 } | {- empty -} { [] } tv_bndr :: { RdrNameHsTyVar } : tyvar { UserTyVar $1 } | '(' tyvar '::' kind ')' { KindedTyVar $2 $4 } fds :: { [([RdrName], [RdrName])] } : {- empty -} { [] } | '|' fds1 { reverse $2 } fds1 :: { [([RdrName], [RdrName])] } : fds1 ',' fd { $3 : $1 } | fd { [$1] } fd :: { ([RdrName], [RdrName]) } : varids0 '->' varids0 { (reverse $1, reverse $3) } varids0 :: { [RdrName] } : {- empty -} { [] } | varids0 tyvar { $2 : $1 } ----------------------------------------------------------------------------- -- Kinds kind :: { Kind } : akind { $1 } | akind '->' kind { mkArrowKind $1 $3 } akind :: { Kind } : '*' { liftedTypeKind } | '(' kind ')' { $2 } ----------------------------------------------------------------------------- -- Datatype declarations newconstr :: { RdrNameConDecl } : srcloc conid atype { ConDecl $2 [] [] (PrefixCon [unbangedType $3]) $1 } | srcloc conid '{' var '::' ctype '}' { ConDecl $2 [] [] (RecCon [($4, unbangedType $6)]) $1 } constrs :: { [RdrNameConDecl] } : {- empty; a GHC extension -} { [] } | '=' constrs1 { $2 } constrs1 :: { [RdrNameConDecl] } : constrs1 '|' constr { $3 : $1 } | constr { [$1] } constr :: { RdrNameConDecl } : srcloc forall context '=>' constr_stuff { ConDecl (fst $5) $2 $3 (snd $5) $1 } | srcloc forall constr_stuff { ConDecl (fst $3) $2 [] (snd $3) $1 } forall :: { [RdrNameHsTyVar] } : 'forall' tv_bndrs '.' { $2 } | {- empty -} { [] } constr_stuff :: { (RdrName, RdrNameConDetails) } : btype {% mkPrefixCon $1 [] } | btype strict_mark atype satypes {% mkPrefixCon $1 (BangType $2 $3 : $4) } | oqtycon '{' '}' {% mkRecCon $1 [] } | oqtycon '{' fielddecls '}' {% mkRecCon $1 $3 } | sbtype conop sbtype { ($2, InfixCon $1 $3) } satypes :: { [RdrNameBangType] } : atype satypes { unbangedType $1 : $2 } | strict_mark atype satypes { BangType $1 $2 : $3 } | {- empty -} { [] } sbtype :: { RdrNameBangType } : btype { unbangedType $1 } | strict_mark atype { BangType $1 $2 } fielddecls :: { [([RdrName],RdrNameBangType)] } : fielddecl ',' fielddecls { $1 : $3 } | fielddecl { [$1] } fielddecl :: { ([RdrName],RdrNameBangType) } : sig_vars '::' stype { (reverse $1, $3) } stype :: { RdrNameBangType } : ctype { unbangedType $1 } | strict_mark atype { BangType $1 $2 } strict_mark :: { HsBang } : '!' { HsStrict } | '{-# UNPACK' '#-}' '!' { HsUnbox } deriving :: { Maybe RdrNameContext } : {- empty -} { Nothing } | 'deriving' context { Just $2 } -- Glasgow extension: allow partial -- applications in derivings ----------------------------------------------------------------------------- -- Value definitions {- There's an awkward overlap with a type signature. Consider f :: Int -> Int = ...rhs... Then we can't tell whether it's a type signature or a value definition with a result signature until we see the '='. So we have to inline enough to postpone reductions until we know. -} {- ATTENTION: Dirty Hackery Ahead! If the second alternative of vars is var instead of qvar, we get another shift/reduce-conflict. Consider the following programs: { (^^) :: Int->Int ; } Type signature; only var allowed { (^^) :: Int->Int = ... ; } Value defn with result signature; qvar allowed (because of instance decls) We can't tell whether to reduce var to qvar until after we've read the signatures. -} decl :: { RdrBinding } : sigdecl { $1 } | infixexp srcloc opt_sig rhs {% checkValDef $1 $3 $4 $2 } rhs :: { RdrNameGRHSs } : '=' srcloc exp wherebinds { GRHSs (unguardedRHS $3 $2) $4 placeHolderType } | gdrhs wherebinds { GRHSs (reverse $1) $2 placeHolderType } gdrhs :: { [RdrNameGRHS] } : gdrhs gdrh { $2 : $1 } | gdrh { [$1] } gdrh :: { RdrNameGRHS } : '|' srcloc quals '=' exp { GRHS (reverse (ResultStmt $5 $2 : $3)) $2 } sigdecl :: { RdrBinding } : infixexp srcloc '::' sigtype {% checkValSig $1 $4 $2 } -- See the above notes for why we need infixexp here | var ',' sig_vars srcloc '::' sigtype { mkSigDecls [ Sig n $6 $4 | n <- $1:$3 ] } | srcloc infix prec ops { mkSigDecls [ FixSig (FixitySig n (Fixity $3 $2) $1) | n <- $4 ] } | '{-# INLINE' srcloc activation qvar '#-}' { RdrHsDecl (SigD (InlineSig True $4 $3 $2)) } | '{-# NOINLINE' srcloc inverse_activation qvar '#-}' { RdrHsDecl (SigD (InlineSig False $4 $3 $2)) } | '{-# SPECIALISE' srcloc qvar '::' sigtypes '#-}' { mkSigDecls [ SpecSig $3 t $2 | t <- $5] } | '{-# SPECIALISE' srcloc 'instance' inst_type '#-}' { RdrHsDecl (SigD (SpecInstSig $4 $2)) } ----------------------------------------------------------------------------- -- Expressions exp :: { RdrNameHsExpr } : infixexp '::' sigtype { ExprWithTySig $1 $3 } | fexp srcloc '-<' exp { HsArrApp $1 $4 placeHolderType HsFirstOrderApp True $2 } | fexp srcloc '>-' exp { HsArrApp $4 $1 placeHolderType HsFirstOrderApp False $2 } | fexp srcloc '-<<' exp { HsArrApp $1 $4 placeHolderType HsHigherOrderApp True $2 } | fexp srcloc '>>-' exp { HsArrApp $4 $1 placeHolderType HsHigherOrderApp False $2 } | infixexp { $1 } infixexp :: { RdrNameHsExpr } : exp10 { $1 } | infixexp qop exp10 { (OpApp $1 (HsVar $2) (panic "fixity") $3 )} exp10 :: { RdrNameHsExpr } : '\\' srcloc aexp aexps opt_asig '->' srcloc exp {% checkPatterns $2 ($3 : reverse $4) >>= \ ps -> return (HsLam (Match ps $5 (GRHSs (unguardedRHS $8 $7) EmptyBinds placeHolderType))) } | 'let' binds 'in' exp { HsLet $2 $4 } | 'if' srcloc exp 'then' exp 'else' exp { HsIf $3 $5 $7 $2 } | 'case' srcloc exp 'of' altslist { HsCase $3 $5 $2 } | '-' fexp { mkHsNegApp $2 } | srcloc 'do' stmtlist {% checkDo $3 >>= \ stmts -> return (mkHsDo DoExpr stmts $1) } | srcloc 'mdo' stmtlist {% checkMDo $3 >>= \ stmts -> return (mkHsDo MDoExpr stmts $1) } | scc_annot exp { if opt_SccProfilingOn then HsSCC $1 $2 else HsPar $2 } | 'proc' srcloc aexp '->' srcloc exp {% checkPattern $2 $3 >>= \ p -> return (HsProc p (HsCmdTop $6 [] placeHolderType undefined) $5) } | '{-# CORE' STRING '#-}' exp { HsCoreAnn $2 $4 } -- hdaume: core annotation | fexp { $1 } scc_annot :: { FastString } : '_scc_' STRING { $2 } | '{-# SCC' STRING '#-}' { $2 } fexp :: { RdrNameHsExpr } : fexp aexp { HsApp $1 $2 } | aexp { $1 } aexps :: { [RdrNameHsExpr] } : aexps aexp { $2 : $1 } | {- empty -} { [] } aexp :: { RdrNameHsExpr } : qvar '@' aexp { EAsPat $1 $3 } | '~' aexp { ELazyPat $2 } | aexp1 { $1 } aexp1 :: { RdrNameHsExpr } : aexp1 '{' fbinds '}' {% (mkRecConstrOrUpdate $1 (reverse $3)) } | aexp2 { $1 } -- Here was the syntax for type applications that I was planning -- but there are difficulties (e.g. what order for type args) -- so it's not enabled yet. -- But this case *is* used for the left hand side of a generic definition, -- which is parsed as an expression before being munged into a pattern | qcname '{|' gentype '|}' { (HsApp (HsVar $1) (HsType $3)) } aexp2 :: { RdrNameHsExpr } : ipvar { HsIPVar $1 } | qcname { HsVar $1 } | literal { HsLit $1 } | INTEGER { HsOverLit $! mkHsIntegral $1 } | RATIONAL { HsOverLit $! mkHsFractional $1 } | '(' exp ')' { HsPar $2 } | '(' exp ',' texps ')' { ExplicitTuple ($2 : reverse $4) Boxed} | '(#' texps '#)' { ExplicitTuple (reverse $2) Unboxed } | '[' list ']' { $2 } | '[:' parr ':]' { $2 } | '(' infixexp qop ')' { (SectionL $2 (HsVar $3)) } | '(' qopm infixexp ')' { (SectionR $2 $3) } | '_' { EWildPat } -- MetaHaskell Extension | srcloc TH_ID_SPLICE { mkHsSplice (HsVar (mkUnqual varName $2)) $1 } -- $x | srcloc '$(' exp ')' { mkHsSplice $3 $1 } -- $( exp ) | srcloc TH_VAR_QUOTE qvar { HsBracket (VarBr $3) $1 } | srcloc TH_VAR_QUOTE qcon { HsBracket (VarBr $3) $1 } | srcloc TH_TY_QUOTE tyvar { HsBracket (VarBr $3) $1 } | srcloc TH_TY_QUOTE gtycon { HsBracket (VarBr $3) $1 } | srcloc '[|' exp '|]' { HsBracket (ExpBr $3) $1 } | srcloc '[t|' ctype '|]' { HsBracket (TypBr $3) $1 } | srcloc '[p|' infixexp '|]' {% checkPattern $1 $3 >>= \p -> return (HsBracket (PatBr p) $1) } | srcloc '[d|' cvtopbody '|]' { HsBracket (DecBr (mkGroup $3)) $1 } -- arrow notation extension | srcloc '(|' aexp2 cmdargs '|)' { HsArrForm $3 Nothing (reverse $4) $1 } cmdargs :: { [RdrNameHsCmdTop] } : cmdargs acmd { $2 : $1 } | {- empty -} { [] } acmd :: { RdrNameHsCmdTop } : aexp2 { HsCmdTop $1 [] placeHolderType undefined } cvtopbody :: { [RdrNameHsDecl] } : '{' cvtopdecls '}' { $2 } | vocurly cvtopdecls close { $2 } texps :: { [RdrNameHsExpr] } : texps ',' exp { $3 : $1 } | exp { [$1] } ----------------------------------------------------------------------------- -- List expressions -- The rules below are little bit contorted to keep lexps left-recursive while -- avoiding another shift/reduce-conflict. list :: { RdrNameHsExpr } : exp { ExplicitList placeHolderType [$1] } | lexps { ExplicitList placeHolderType (reverse $1) } | exp '..' { ArithSeqIn (From $1) } | exp ',' exp '..' { ArithSeqIn (FromThen $1 $3) } | exp '..' exp { ArithSeqIn (FromTo $1 $3) } | exp ',' exp '..' exp { ArithSeqIn (FromThenTo $1 $3 $5) } | exp srcloc pquals { mkHsDo ListComp (reverse (ResultStmt $1 $2 : $3)) $2 } lexps :: { [RdrNameHsExpr] } : lexps ',' exp { $3 : $1 } | exp ',' exp { [$3,$1] } ----------------------------------------------------------------------------- -- List Comprehensions pquals :: { [RdrNameStmt] } -- Either a singleton ParStmt, or a reversed list of Stmts : pquals1 { case $1 of [qs] -> qs qss -> [ParStmt stmtss] where stmtss = [ (reverse qs, undefined) | qs <- qss ] } pquals1 :: { [[RdrNameStmt]] } : pquals1 '|' quals { $3 : $1 } | '|' quals { [$2] } quals :: { [RdrNameStmt] } : quals ',' qual { $3 : $1 } | qual { [$1] } ----------------------------------------------------------------------------- -- Parallel array expressions -- The rules below are little bit contorted; see the list case for details. -- Note that, in contrast to lists, we only have finite arithmetic sequences. -- Moreover, we allow explicit arrays with no element (represented by the nil -- constructor in the list case). parr :: { RdrNameHsExpr } : { ExplicitPArr placeHolderType [] } | exp { ExplicitPArr placeHolderType [$1] } | lexps { ExplicitPArr placeHolderType (reverse $1) } | exp '..' exp { PArrSeqIn (FromTo $1 $3) } | exp ',' exp '..' exp { PArrSeqIn (FromThenTo $1 $3 $5) } | exp srcloc pquals { mkHsDo PArrComp (reverse (ResultStmt $1 $2 : $3)) $2 } -- We are reusing `lexps' and `pquals' from the list case. ----------------------------------------------------------------------------- -- Case alternatives altslist :: { [RdrNameMatch] } : '{' alts '}' { reverse $2 } | vocurly alts close { reverse $2 } alts :: { [RdrNameMatch] } : alts1 { $1 } | ';' alts { $2 } alts1 :: { [RdrNameMatch] } : alts1 ';' alt { $3 : $1 } | alts1 ';' { $1 } | alt { [$1] } alt :: { RdrNameMatch } : srcloc infixexp opt_sig ralt wherebinds {% (checkPattern $1 $2 >>= \p -> return (Match [p] $3 (GRHSs $4 $5 placeHolderType)) )} ralt :: { [RdrNameGRHS] } : '->' srcloc exp { [GRHS [ResultStmt $3 $2] $2] } | gdpats { reverse $1 } gdpats :: { [RdrNameGRHS] } : gdpats gdpat { $2 : $1 } | gdpat { [$1] } gdpat :: { RdrNameGRHS } : srcloc '|' quals '->' exp { GRHS (reverse (ResultStmt $5 $1:$3)) $1} ----------------------------------------------------------------------------- -- Statement sequences stmtlist :: { [RdrNameStmt] } : '{' stmts '}' { $2 } | vocurly stmts close { $2 } -- do { ;; s ; s ; ; s ;; } -- The last Stmt should be a ResultStmt, but that's hard to enforce -- here, because we need too much lookahead if we see do { e ; } -- So we use ExprStmts throughout, and switch the last one over -- in ParseUtils.checkDo instead stmts :: { [RdrNameStmt] } : stmt stmts_help { $1 : $2 } | ';' stmts { $2 } | {- empty -} { [] } stmts_help :: { [RdrNameStmt] } : ';' stmts { $2 } | {- empty -} { [] } -- For typing stmts at the GHCi prompt, where -- the input may consist of just comments. maybe_stmt :: { Maybe RdrNameStmt } : stmt { Just $1 } | {- nothing -} { Nothing } stmt :: { RdrNameStmt } : qual { $1 } | srcloc infixexp '->' exp {% checkPattern $1 $4 >>= \p -> return (BindStmt p $2 $1) } | srcloc 'rec' stmtlist { RecStmt $3 undefined undefined undefined } qual :: { RdrNameStmt } : srcloc infixexp '<-' exp {% checkPattern $1 $2 >>= \p -> return (BindStmt p $4 $1) } | srcloc exp { ExprStmt $2 placeHolderType $1 } | srcloc 'let' binds { LetStmt $3 } ----------------------------------------------------------------------------- -- Record Field Update/Construction fbinds :: { RdrNameHsRecordBinds } : fbinds1 { $1 } | {- empty -} { [] } fbinds1 :: { RdrNameHsRecordBinds } : fbinds1 ',' fbind { $3 : $1 } | fbind { [$1] } fbind :: { (RdrName, RdrNameHsExpr) } : qvar '=' exp { ($1,$3) } ----------------------------------------------------------------------------- -- Implicit Parameter Bindings dbinds :: { [(IPName RdrName, RdrNameHsExpr)] } : dbinds ';' dbind { $3 : $1 } | dbinds ';' { $1 } | dbind { [$1] } -- | {- empty -} { [] } dbind :: { (IPName RdrName, RdrNameHsExpr) } dbind : ipvar '=' exp { ($1, $3) } ----------------------------------------------------------------------------- -- Variables, Constructors and Operators. identifier :: { RdrName } : qvar { $1 } | gcon { $1 } | qop { $1 } depreclist :: { [RdrName] } depreclist : deprec_var { [$1] } | deprec_var ',' depreclist { $1 : $3 } deprec_var :: { RdrName } deprec_var : var { $1 } | tycon { $1 } gcon :: { RdrName } -- Data constructor namespace : sysdcon { nameRdrName (dataConName $1) } | qcon { $1 } -- the case of '[:' ':]' is part of the production `parr' sysdcon :: { DataCon } -- Wired in data constructors : '(' ')' { unitDataCon } | '(' commas ')' { tupleCon Boxed $2 } | '[' ']' { nilDataCon } var :: { RdrName } : varid { $1 } | '(' varsym ')' { $2 } qvar :: { RdrName } : qvarid { $1 } | '(' varsym ')' { $2 } | '(' qvarsym1 ')' { $2 } -- We've inlined qvarsym here so that the decision about -- whether it's a qvar or a var can be postponed until -- *after* we see the close paren. ipvar :: { IPName RdrName } : IPDUPVARID { Dupable (mkUnqual varName $1) } | IPSPLITVARID { Linear (mkUnqual varName $1) } qcon :: { RdrName } : qconid { $1 } | '(' qconsym ')' { $2 } varop :: { RdrName } : varsym { $1 } | '`' varid '`' { $2 } qvarop :: { RdrName } : qvarsym { $1 } | '`' qvarid '`' { $2 } qvaropm :: { RdrName } : qvarsym_no_minus { $1 } | '`' qvarid '`' { $2 } conop :: { RdrName } : consym { $1 } | '`' conid '`' { $2 } qconop :: { RdrName } : qconsym { $1 } | '`' qconid '`' { $2 } ----------------------------------------------------------------------------- -- Type constructors gtycon :: { RdrName } -- A "general" qualified tycon : oqtycon { $1 } | '(' ')' { getRdrName unitTyCon } | '(' commas ')' { getRdrName (tupleTyCon Boxed $2) } | '(' '->' ')' { getRdrName funTyCon } | '[' ']' { listTyCon_RDR } | '[:' ':]' { parrTyCon_RDR } oqtycon :: { RdrName } -- An "ordinary" qualified tycon : qtycon { $1 } | '(' qtyconsym ')' { $2 } qtyconop :: { RdrName } -- Qualified or unqualified : qtyconsym { $1 } | '`' qtycon '`' { $2 } tyconop :: { RdrName } -- Unqualified : tyconsym { $1 } | '`' tycon '`' { $2 } qtycon :: { RdrName } -- Qualified or unqualified : QCONID { mkQual tcClsName $1 } | tycon { $1 } tycon :: { RdrName } -- Unqualified : CONID { mkUnqual tcClsName $1 } qtyconsym :: { RdrName } : QCONSYM { mkQual tcClsName $1 } | tyconsym { $1 } tyconsym :: { RdrName } : CONSYM { mkUnqual tcClsName $1 } ----------------------------------------------------------------------------- -- Any operator op :: { RdrName } -- used in infix decls : varop { $1 } | conop { $1 } qop :: { RdrName {-HsExpr-} } -- used in sections : qvarop { $1 } | qconop { $1 } qopm :: { RdrNameHsExpr } -- used in sections : qvaropm { HsVar $1 } | qconop { HsVar $1 } ----------------------------------------------------------------------------- -- VarIds qvarid :: { RdrName } : varid { $1 } | QVARID { mkQual varName $1 } varid :: { RdrName } : varid_no_unsafe { $1 } | 'unsafe' { mkUnqual varName FSLIT("unsafe") } | 'safe' { mkUnqual varName FSLIT("safe") } | 'threadsafe' { mkUnqual varName FSLIT("threadsafe") } varid_no_unsafe :: { RdrName } : VARID { mkUnqual varName $1 } | special_id { mkUnqual varName $1 } | 'forall' { mkUnqual varName FSLIT("forall") } tyvar :: { RdrName } : VARID { mkUnqual tvName $1 } | special_id { mkUnqual tvName $1 } | 'unsafe' { mkUnqual tvName FSLIT("unsafe") } | 'safe' { mkUnqual tvName FSLIT("safe") } | 'threadsafe' { mkUnqual tvName FSLIT("threadsafe") } -- These special_ids are treated as keywords in various places, -- but as ordinary ids elsewhere. 'special_id' collects all these -- except 'unsafe' and 'forall' whose treatment differs depending on context special_id :: { UserFS } special_id : 'as' { FSLIT("as") } | 'qualified' { FSLIT("qualified") } | 'hiding' { FSLIT("hiding") } | 'export' { FSLIT("export") } | 'label' { FSLIT("label") } | 'dynamic' { FSLIT("dynamic") } | 'stdcall' { FSLIT("stdcall") } | 'ccall' { FSLIT("ccall") } ----------------------------------------------------------------------------- -- Variables qvarsym :: { RdrName } : varsym { $1 } | qvarsym1 { $1 } qvarsym_no_minus :: { RdrName } : varsym_no_minus { $1 } | qvarsym1 { $1 } qvarsym1 :: { RdrName } qvarsym1 : QVARSYM { mkQual varName $1 } varsym :: { RdrName } : varsym_no_minus { $1 } | '-' { mkUnqual varName FSLIT("-") } varsym_no_minus :: { RdrName } -- varsym not including '-' : VARSYM { mkUnqual varName $1 } | special_sym { mkUnqual varName $1 } -- See comments with special_id special_sym :: { UserFS } special_sym : '!' { FSLIT("!") } | '.' { FSLIT(".") } | '*' { FSLIT("*") } ----------------------------------------------------------------------------- -- Data constructors qconid :: { RdrName } -- Qualified or unqualifiedb : conid { $1 } | QCONID { mkQual dataName $1 } conid :: { RdrName } : CONID { mkUnqual dataName $1 } qconsym :: { RdrName } -- Qualified or unqualified : consym { $1 } | QCONSYM { mkQual dataName $1 } consym :: { RdrName } : CONSYM { mkUnqual dataName $1 } -- ':' means only list cons | ':' { consDataCon_RDR } ----------------------------------------------------------------------------- -- Literals literal :: { HsLit } : CHAR { HsChar (ord $1) } --TODO remove ord | STRING { HsString $1 } | PRIMINTEGER { HsIntPrim $1 } | PRIMCHAR { HsCharPrim (ord $1) } --TODO remove ord | PRIMSTRING { HsStringPrim $1 } | PRIMFLOAT { HsFloatPrim $1 } | PRIMDOUBLE { HsDoublePrim $1 } srcloc :: { SrcLoc } : {% getSrcLoc } ----------------------------------------------------------------------------- -- Layout close :: { () } : vccurly { () } -- context popped in lexer. | error {% popContext } ----------------------------------------------------------------------------- -- Miscellaneous (mostly renamings) modid :: { ModuleName } : CONID { mkModuleNameFS $1 } | QCONID { mkModuleNameFS (mkFastString (unpackFS (fst $1) ++ '.':unpackFS (snd $1))) } commas :: { Int } : commas ',' { $1 + 1 } | ',' { 2 } ----------------------------------------------------------------------------- { happyError :: P a happyError = srcParseFail }