{-
-----------------------------------------------------------------------------
-$Id: Parser.y,v 1.35 2000/09/14 13:46:40 simonpj Exp $
+$Id: Parser.y,v 1.43 2000/10/24 08:40:10 simonpj Exp $
Haskell grammar.
import HsSyn
import HsPragmas
import HsTypes ( mkHsTupCon )
+import HsPat ( InPat(..) )
import RdrHsSyn
import Lex
import ParseUtil
import RdrName
import PrelInfo ( mAIN_Name )
-import OccName ( varName, ipName, tcName, dataName, tcClsName, tvName )
+import OccName ( UserFS, varName, ipName, tcName, dataName, tcClsName, tvName )
import SrcLoc ( SrcLoc )
import Module
import CallConv
import GlaExts
import FastString ( tailFS )
+import Outputable
#include "HsVersions.h"
}
'!' { ITbang }
'.' { ITdot }
- '/\\' { ITbiglam } -- GHC-extension symbols
-
'{' { ITocurly } -- special symbols
'}' { ITccurly }
+ '{|' { ITocurlybar }
+ '|}' { ITccurlybar }
vccurly { ITvccurly } -- virtual close curly (from layout)
'[' { ITobrack }
']' { ITcbrack }
IPVARID { ITipvarid $$ } -- GHC extension
- PRAGMA { ITpragma $$ }
-
CHAR { ITchar $$ }
STRING { ITstring $$ }
INTEGER { ITinteger $$ }
PRIMDOUBLE { ITprimdouble $$ }
CLITLIT { ITlitlit $$ }
- UNKNOWN { ITunknown $$ }
-
%monad { P } { thenP } { returnP }
%lexer { lexer } { ITeof }
%name parse
| srcloc 'data' ctype '=' constrs deriving
{% checkDataHeader $3 `thenP` \(cs,c,ts) ->
returnP (RdrHsDecl (TyClD
- (TyData DataType cs c ts (reverse $5) (length $5) $6
- NoDataPragmas $1))) }
+ (mkTyData DataType cs c ts (reverse $5) (length $5) $6 $1))) }
| srcloc 'newtype' ctype '=' newconstr deriving
{% checkDataHeader $3 `thenP` \(cs,c,ts) ->
returnP (RdrHsDecl (TyClD
- (TyData NewType cs c ts [$5] 1 $6
- NoDataPragmas $1))) }
+ (mkTyData NewType cs c ts [$5] 1 $6 $1))) }
| srcloc 'class' ctype fds where
{% checkDataHeader $3 `thenP` \(cs,c,ts) ->
(binds,sigs) = cvMonoBindsAndSigs cvClassOpSig (groupBindings $5)
in
returnP (RdrHsDecl (TyClD
- (mkClassDecl cs c ts $4 sigs binds
- NoClassPragmas $1))) }
+ (mkClassDecl cs c ts $4 sigs binds $1))) }
| srcloc 'instance' inst_type where
{ let (binds,sigs)
-- SUP: TEMPORARY HACK, not checking for `module Foo'
deprecation :: { RdrBinding }
- : srcloc exportlist STRING
+ : srcloc depreclist STRING
{ foldr RdrAndBindings RdrNullBind
[ RdrHsDecl (DeprecD (Deprecation n $3 $1)) | n <- $2 ] }
| sigtypes ',' sigtype { $3 : $1 }
sigtype :: { RdrNameHsType }
- : ctype { mkHsForAllTy Nothing [] $1 }
+ : ctype { (mkHsForAllTy Nothing [] $1) }
sig_vars :: { [RdrName] }
: sig_vars ',' var { $3 : $1 }
ctype :: { RdrNameHsType }
: 'forall' tyvars '.' ctype { mkHsForAllTy (Just $2) [] $4 }
| context type { mkHsForAllTy Nothing $1 $2 }
- -- A type of form (context => type) is an *implicit* HsForAllTy
+ -- A type of form (context => type) is an *implicit* HsForAllTy
| type { $1 }
type :: { RdrNameHsType }
- : btype '->' type { HsFunTy $1 $3 }
+ : gentype '->' type { HsFunTy $1 $3 }
| ipvar '::' type { mkHsIParamTy $1 $3 }
- | btype { $1 }
+ | gentype { $1 }
+
+gentype :: { RdrNameHsType }
+ : btype { $1 }
+-- Generics
+ | atype tyconop atype { HsOpTy $1 $2 $3 }
btype :: { RdrNameHsType }
- : btype atype { HsAppTy $1 $2 }
+ : btype atype { (HsAppTy $1 $2) }
| atype { $1 }
atype :: { RdrNameHsType }
| '(' type ',' types ')' { HsTupleTy (mkHsTupCon tcName Boxed ($2:$4)) ($2 : reverse $4) }
| '(#' types '#)' { HsTupleTy (mkHsTupCon tcName Unboxed $2) (reverse $2) }
| '[' type ']' { HsListTy $2 }
- | '(' ctype ')' { $2 }
+ | '(' ctype ')' { $2 }
+-- 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
-----------------------------------------------------------------------------
-- Datatype declarations
+newconstr :: { RdrNameConDecl }
+ : srcloc conid atype { mkConDecl $2 [] [] (VanillaCon [Unbanged $3]) $1 }
+ | srcloc conid '{' var '::' type '}'
+ { mkConDecl $2 [] [] (RecCon [([$4], Unbanged $6)]) $1 }
+
constrs :: { [RdrNameConDecl] }
: constrs '|' constr { $3 : $1 }
| constr { [$1] }
: btype '=>' {% checkContext $1 }
constr_stuff :: { (RdrName, RdrNameConDetails) }
- : scontype { (fst $1, VanillaCon (snd $1)) }
+ : btype {% mkVanillaCon $1 [] }
+ | btype '!' atype satypes {% mkVanillaCon $1 (Banged $3 : $4) }
+ | gtycon '{' fielddecls '}' {% mkRecCon $1 $3 }
| sbtype conop sbtype { ($2, InfixCon $1 $3) }
- | con '{' fielddecls '}' { ($1, RecCon (reverse $3)) }
-
-newconstr :: { RdrNameConDecl }
- : srcloc conid atype { mkConDecl $2 [] [] (VanillaCon [Unbanged $3]) $1 }
- | srcloc conid '{' var '::' type '}'
- { mkConDecl $2 [] [] (RecCon [([$4], Unbanged $6)]) $1 }
-
-scontype :: { (RdrName, [RdrNameBangType]) }
- : btype {% splitForConApp $1 [] }
- | scontype1 { $1 }
-scontype1 :: { (RdrName, [RdrNameBangType]) }
- : btype '!' atype {% splitForConApp $1 [Banged $3] }
- | scontype1 satype { (fst $1, snd $1 ++ [$2] ) }
- | '(' consym ')' { ($2,[]) }
-
-satype :: { RdrNameBangType }
- : atype { Unbanged $1 }
- | '!' atype { Banged $2 }
+satypes :: { [RdrNameBangType] }
+ : atype satypes { Unbanged $1 : $2 }
+ | '!' atype satypes { Banged $2 : $3 }
+ | {- empty -} { [] }
sbtype :: { RdrNameBangType }
: btype { Unbanged $1 }
| '!' atype { Banged $2 }
fielddecls :: { [([RdrName],RdrNameBangType)] }
- : fielddecls ',' fielddecl { $3 : $1 }
+ : fielddecl ',' fielddecls { $1 : $3 }
| fielddecl { [$1] }
fielddecl :: { ([RdrName],RdrNameBangType) }
-}
valdef :: { RdrBinding }
- : infixexp srcloc opt_sig rhs {% checkValDef $1 $3 $4 $2 }
- | infixexp srcloc '::' sigtype {% checkValSig $1 $4 $2 }
+ : infixexp srcloc opt_sig rhs {% (checkValDef $1 $3 $4 $2) }
+ | infixexp srcloc '::' sigtype {% (checkValSig $1 $4 $2) }
| var ',' sig_vars srcloc '::' sigtype { foldr1 RdrAndBindings
[ RdrSig (Sig n $6 $4) | n <- $1:$3 ]
- }
+ }
+
rhs :: { RdrNameGRHSs }
- : '=' srcloc exp wherebinds { GRHSs (unguardedRHS $3 $2)
- $4 Nothing}
+ : '=' srcloc exp wherebinds { (GRHSs (unguardedRHS $3 $2)
+ $4 Nothing)}
| gdrhs wherebinds { GRHSs (reverse $1) $2 Nothing }
gdrhs :: { [RdrNameGRHS] }
-- Expressions
exp :: { RdrNameHsExpr }
- : infixexp '::' sigtype { ExprWithTySig $1 $3 }
+ : infixexp '::' sigtype { (ExprWithTySig $1 $3) }
| infixexp 'with' dbinding { HsWith $1 $3 }
| infixexp { $1 }
infixexp :: { RdrNameHsExpr }
: exp10 { $1 }
- | infixexp qop exp10 { OpApp $1 $2 (panic "fixity") $3 }
+ | infixexp qop exp10 { (OpApp $1 (HsVar $2)
+ (panic "fixity") $3 )}
exp10 :: { RdrNameHsExpr }
: '\\' aexp aexps opt_asig '->' srcloc exp
| 'let' declbinds '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 { NegApp $2 (error "NegApp") }
+ | '-' fexp { mkHsNegApp $2 }
| srcloc 'do' stmtlist { HsDo DoStmt $3 $1 }
| '_ccall_' ccallid aexps0 { HsCCall $2 $3 False False cbot }
| CONID { $1 }
fexp :: { RdrNameHsExpr }
- : fexp aexp { HsApp $1 $2 }
+ : fexp aexp { (HsApp $1 $2) }
| aexp { $1 }
aexps0 :: { [RdrNameHsExpr] }
- : aexps { reverse $1 }
+ : aexps { (reverse $1) }
aexps :: { [RdrNameHsExpr] }
: aexps aexp { $2 : $1 }
| {- empty -} { [] }
aexp :: { RdrNameHsExpr }
- : aexp '{' fbinds '}' {% mkRecConstrOrUpdate $1 (reverse $3) }
- | aexp1 { $1 }
+ : var_or_con '{|' gentype '|}' { (HsApp $1 (HsType $3)) }
+ | aexp '{' fbinds '}' {% (mkRecConstrOrUpdate $1
+ (reverse $3)) }
+ | aexp1 { $1 }
+
+var_or_con :: { RdrNameHsExpr }
+ : qvar { HsVar $1 }
+ | gcon { HsVar $1 }
aexp1 :: { RdrNameHsExpr }
- : qvar { HsVar $1 }
- | ipvar { HsIPVar $1 }
- | gcon { HsVar $1 }
- | literal { HsLit $1 }
+ : ipvar { HsIPVar $1 }
+ | var_or_con { $1 }
+ | literal { HsLit $1 }
+ | INTEGER { HsOverLit (mkHsIntegralLit $1) }
+ | RATIONAL { HsOverLit (mkHsFractionalLit $1) }
| '(' exp ')' { HsPar $2 }
| '(' exp ',' texps ')' { ExplicitTuple ($2 : reverse $4) Boxed}
| '(#' texps '#)' { ExplicitTuple (reverse $2) Unboxed }
| '[' list ']' { $2 }
- | '(' infixexp qop ')' { SectionL $2 $3 }
- | '(' qopm infixexp ')' { SectionR $2 $3 }
+ | '(' infixexp qop ')' { (SectionL $2 (HsVar $3)) }
+ | '(' qopm infixexp ')' { (SectionR $2 $3) }
| qvar '@' aexp { EAsPat $1 $3 }
| '_' { EWildPat }
| '~' aexp1 { ELazyPat $2 }
: texps ',' exp { $3 : $1 }
| exp { [$1] }
+
-----------------------------------------------------------------------------
-- List expressions
alt :: { RdrNameMatch }
: infixexp opt_sig ralt wherebinds
- {% checkPattern $1 `thenP` \p ->
+ {% (checkPattern $1 `thenP` \p ->
returnP (Match [] [p] $2
- (GRHSs $3 $4 Nothing)) }
+ (GRHSs $3 $4 Nothing)) )}
ralt :: { [RdrNameGRHS] }
: '->' srcloc exp { [GRHS [ExprStmt $3 $2] $2] }
-----------------------------------------------------------------------------
-- Variables, Constructors and Operators.
+depreclist :: { [RdrName] }
+depreclist : deprec_var { [$1] }
+ | deprec_var ',' depreclist { $1 : $2 }
+
+deprec_var :: { RdrName }
+deprec_var : var { $1 }
+ | tycon { $1 }
+
gtycon :: { RdrName }
: qtycon { $1 }
+ | '(' qtyconop ')' { $2 }
| '(' ')' { unitTyCon_RDR }
| '(' '->' ')' { funTyCon_RDR }
| '[' ']' { listTyCon_RDR }
-- *after* we see the close paren.
ipvar :: { RdrName }
- : IPVARID { (mkSrcUnqual ipName (tailFS $1)) }
-
-con :: { RdrName }
- : conid { $1 }
- | '(' consym ')' { $2 }
+ : IPVARID { (mkUnqual ipName (tailFS $1)) }
qcon :: { RdrName }
: qconid { $1 }
| '`' qvarid '`' { $2 }
qvaropm :: { RdrName }
- : qvarsymm { $1 }
+ : qvarsym_no_minus { $1 }
| '`' qvarid '`' { $2 }
conop :: { RdrName }
: varop { $1 }
| conop { $1 }
-qop :: { RdrNameHsExpr } -- used in sections
- : qvarop { HsVar $1 }
- | qconop { HsVar $1 }
+qop :: { RdrName {-HsExpr-} } -- used in sections
+ : qvarop { $1 }
+ | qconop { $1 }
qopm :: { RdrNameHsExpr } -- used in sections
: qvaropm { HsVar $1 }
qvarid :: { RdrName }
: varid { $1 }
- | QVARID { case $1 of { (mod,n) ->
- mkSrcQual varName mod n } }
+ | QVARID { mkQual varName $1 }
varid :: { RdrName }
- : VARID { mkSrcUnqual varName $1 }
- | 'as' { as_var_RDR }
- | 'qualified' { qualified_var_RDR }
- | 'hiding' { hiding_var_RDR }
- | 'forall' { forall_var_RDR }
- | 'export' { export_var_RDR }
- | 'label' { label_var_RDR }
- | 'dynamic' { dynamic_var_RDR }
- | 'unsafe' { unsafe_var_RDR }
- | 'stdcall' { stdcall_var_RDR }
- | 'ccall' { ccall_var_RDR }
+ : varid_no_unsafe { $1 }
+ | 'unsafe' { mkUnqual varName SLIT("unsafe") }
varid_no_unsafe :: { RdrName }
- : VARID { mkSrcUnqual varName $1 }
- | 'as' { as_var_RDR }
- | 'qualified' { qualified_var_RDR }
- | 'hiding' { hiding_var_RDR }
- | 'forall' { forall_var_RDR }
- | 'export' { export_var_RDR }
- | 'label' { label_var_RDR }
- | 'dynamic' { dynamic_var_RDR }
- | 'stdcall' { stdcall_var_RDR }
- | 'ccall' { ccall_var_RDR }
+ : VARID { mkUnqual varName $1 }
+ | special_id { mkUnqual varName $1 }
+ | 'forall' { mkUnqual varName SLIT("forall") }
+
+tyvar :: { RdrName }
+ : VARID { mkUnqual tvName $1 }
+ | special_id { mkUnqual tvName $1 }
+ | 'unsafe' { mkUnqual tvName SLIT("unsafe") }
+
+-- These special_ids are treated as keywords in various places,
+-- but as ordinary ids elsewhere. A special_id collects all thsee
+-- except 'unsafe' and 'forall' whose treatment differs depending on context
+special_id :: { UserFS }
+special_id
+ : 'as' { SLIT("as") }
+ | 'qualified' { SLIT("qualified") }
+ | 'hiding' { SLIT("hiding") }
+ | 'export' { SLIT("export") }
+ | 'label' { SLIT("label") }
+ | 'dynamic' { SLIT("dynamic") }
+ | 'stdcall' { SLIT("stdcall") }
+ | 'ccall' { SLIT("ccall") }
-----------------------------------------------------------------------------
-- ConIds
qconid :: { RdrName }
: conid { $1 }
- | QCONID { case $1 of { (mod,n) ->
- mkSrcQual dataName mod n } }
+ | QCONID { mkQual dataName $1 }
conid :: { RdrName }
- : CONID { mkSrcUnqual dataName $1 }
+ : CONID { mkUnqual dataName $1 }
-----------------------------------------------------------------------------
-- ConSyms
qconsym :: { RdrName }
: consym { $1 }
- | QCONSYM { case $1 of { (mod,n) ->
- mkSrcQual dataName mod n } }
+ | QCONSYM { mkQual dataName $1 }
consym :: { RdrName }
- : CONSYM { mkSrcUnqual dataName $1 }
+ : CONSYM { mkUnqual dataName $1 }
-----------------------------------------------------------------------------
-- VarSyms
: varsym { $1 }
| qvarsym1 { $1 }
-qvarsymm :: { RdrName }
- : varsymm { $1 }
+qvarsym_no_minus :: { RdrName }
+ : varsym_no_minus { $1 }
| qvarsym1 { $1 }
+qvarsym1 :: { RdrName }
+qvarsym1 : QVARSYM { mkQual varName $1 }
+
varsym :: { RdrName }
- : VARSYM { mkSrcUnqual varName $1 }
- | '-' { minus_RDR }
- | '!' { pling_RDR }
- | '.' { dot_RDR }
+ : varsym_no_minus { $1 }
+ | '-' { mkUnqual varName SLIT("-") }
-varsymm :: { RdrName } -- varsym not including '-'
- : VARSYM { mkSrcUnqual varName $1 }
- | '!' { pling_RDR }
- | '.' { dot_RDR }
+varsym_no_minus :: { RdrName } -- varsym not including '-'
+ : VARSYM { mkUnqual varName $1 }
+ | special_sym { mkUnqual varName $1 }
-qvarsym1 :: { RdrName }
- : QVARSYM { case $1 of { (mod,n) ->
- mkSrcQual varName mod n } }
-literal :: { HsLit }
- : INTEGER { HsInt $1 }
- | CHAR { HsChar $1 }
- | RATIONAL { HsFrac $1 }
- | STRING { HsString $1 }
+-- See comments with special_id
+special_sym :: { UserFS }
+special_sym : '!' { SLIT("!") }
+ | '.' { SLIT(".") }
+-----------------------------------------------------------------------------
+-- Literals
+
+literal :: { HsLit }
+ : CHAR { HsChar $1 }
+ | STRING { HsString $1 }
| PRIMINTEGER { HsIntPrim $1 }
| PRIMCHAR { HsCharPrim $1 }
| PRIMSTRING { HsStringPrim $1 }
| PRIMFLOAT { HsFloatPrim $1 }
| PRIMDOUBLE { HsDoublePrim $1 }
- | CLITLIT { HsLitLit $1 }
+ | CLITLIT { HsLitLit $1 (error "Parser.y: CLITLIT") }
srcloc :: { SrcLoc } : {% getSrcLocP }
: CONID { mkSrcModuleFS $1 }
tycon :: { RdrName }
- : CONID { mkSrcUnqual tcClsName $1 }
+ : CONID { mkUnqual tcClsName $1 }
+
+tyconop :: { RdrName }
+ : CONSYM { mkUnqual tcClsName $1 }
qtycon :: { RdrName }
: tycon { $1 }
- | QCONID { case $1 of { (mod,n) ->
- mkSrcQual tcClsName mod n } }
+ | QCONID { mkQual tcClsName $1 }
+
+qtyconop :: { RdrName }
+ : tyconop { $1 }
+ | QCONSYM { mkQual tcClsName $1 }
qtycls :: { RdrName }
: qtycon { $1 }
-tyvar :: { RdrName }
- : VARID { mkSrcUnqual tvName $1 }
- | 'as' { as_tyvar_RDR }
- | 'qualified' { qualified_tyvar_RDR }
- | 'hiding' { hiding_tyvar_RDR }
- | 'export' { export_tyvar_RDR }
- | 'label' { label_tyvar_RDR }
- | 'dynamic' { dynamic_tyvar_RDR }
- | 'unsafe' { unsafe_tyvar_RDR }
- | 'stdcall' { stdcall_tyvar_RDR }
- | 'ccall' { ccall_tyvar_RDR }
- -- NOTE: no 'forall'
-
commas :: { Int }
: commas ',' { $1 + 1 }
| ',' { 2 }
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