{-
-----------------------------------------------------------------------------
-$Id: Parser.y,v 1.37 2000/10/03 08:43:02 simonpj Exp $
+$Id: Parser.y,v 1.48 2000/11/16 11:39:37 simonmar Exp $
Haskell grammar.
-}
{
-module Parser ( parse ) where
+module Parser ( ParseStuff(..), parse ) where
import HsSyn
-import HsPragmas
import HsTypes ( mkHsTupCon )
import HsPat ( InPat(..) )
import Lex
import ParseUtil
import RdrName
-import PrelInfo ( mAIN_Name )
+import PrelNames
import OccName ( UserFS, varName, ipName, tcName, dataName, tcClsName, tvName )
import SrcLoc ( SrcLoc )
import Module
'{-# DEPRECATED' { ITdeprecated_prag }
'#-}' { ITclose_prag }
+ '__expr' { ITexpr }
+
{-
'__interface' { ITinterface } -- interface keywords
'__export' { IT__export }
%%
-----------------------------------------------------------------------------
+-- Entry points
+
+parse :: { ParseStuff }
+ : module { PModule $1 }
+ | '__expr' exp { PExpr $2 }
+
+-----------------------------------------------------------------------------
-- Module Header
-- The place for module deprecation is really too restrictive, but if it
importdecl :: { RdrNameImportDecl }
: 'import' srcloc maybe_src optqualified CONID maybeas maybeimpspec
- { ImportDecl (mkSrcModuleFS $5) $3 $4 $6 $7 $2 }
+ { ImportDecl (mkModuleNameFS $5) $3 $4 $6 $7 $2 }
maybe_src :: { WhereFrom }
: '{-# SOURCE' '#-}' { ImportByUserSource }
| srcloc 'data' ctype '=' constrs deriving
{% checkDataHeader $3 `thenP` \(cs,c,ts) ->
returnP (RdrHsDecl (TyClD
- (mkTyData 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
- (mkTyData 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 ] }
-----------------------------------------------------------------------------
-- 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) }
: ipvar { HsIPVar $1 }
| var_or_con { $1 }
| literal { HsLit $1 }
- | INTEGER { HsOverLit (mkHsIntegralLit $1) }
- | RATIONAL { HsOverLit (mkHsFractionalLit $1) }
+ | INTEGER { HsOverLit (HsIntegral $1 fromInteger_RDR) }
+ | RATIONAL { HsOverLit (HsFractional $1 fromRational_RDR) }
| '(' exp ')' { HsPar $2 }
| '(' exp ',' texps ')' { ExplicitTuple ($2 : reverse $4) Boxed}
| '(#' texps '#)' { ExplicitTuple (reverse $2) Unboxed }
| exp ',' exp '..' { ArithSeqIn (FromThen $1 $3) }
| exp '..' exp { ArithSeqIn (FromTo $1 $3) }
| exp ',' exp '..' exp { ArithSeqIn (FromThenTo $1 $3 $5) }
- | exp srcloc '|' quals { HsDo ListComp (reverse
- (ReturnStmt $1 : $4)) $2 }
+ | exp srcloc pquals {% let { body [qs] = qs;
+ body qss = [ParStmt (map reverse qss)] }
+ in
+ returnP ( HsDo ListComp
+ (reverse (ReturnStmt $1 : body $3))
+ $2
+ )
+ }
lexps :: { [RdrNameHsExpr] }
: lexps ',' exp { $3 : $1 }
-----------------------------------------------------------------------------
-- List Comprehensions
+pquals :: { [[RdrNameStmt]] }
+ : pquals '|' quals { $3 : $1 }
+ | '|' quals { [$2] }
+
quals :: { [RdrNameStmt] }
: quals ',' qual { $3 : $1 }
| qual { [$1] }
-----------------------------------------------------------------------------
-- Variables, Constructors and Operators.
+depreclist :: { [RdrName] }
+depreclist : deprec_var { [$1] }
+ | deprec_var ',' depreclist { $1 : $3 }
+
+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 :: { RdrName }
: varid { $1 }
- | QVARID { mkSrcQual varName $1 }
+ | QVARID { mkQual varName $1 }
varid :: { RdrName }
: varid_no_unsafe { $1 }
- | 'unsafe' { mkSrcUnqual varName SLIT("unsafe") }
+ | 'unsafe' { mkUnqual varName SLIT("unsafe") }
varid_no_unsafe :: { RdrName }
- : VARID { mkSrcUnqual varName $1 }
- | special_id { mkSrcUnqual varName $1 }
- | 'forall' { mkSrcUnqual varName SLIT("forall") }
+ : VARID { mkUnqual varName $1 }
+ | special_id { mkUnqual varName $1 }
+ | 'forall' { mkUnqual varName SLIT("forall") }
tyvar :: { RdrName }
- : VARID { mkSrcUnqual tvName $1 }
- | special_id { mkSrcUnqual tvName $1 }
- | 'unsafe' { mkSrcUnqual tvName SLIT("unsafe") }
+ : 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
qconid :: { RdrName }
: conid { $1 }
- | QCONID { mkSrcQual dataName $1 }
+ | QCONID { mkQual dataName $1 }
conid :: { RdrName }
- : CONID { mkSrcUnqual dataName $1 }
+ : CONID { mkUnqual dataName $1 }
-----------------------------------------------------------------------------
-- ConSyms
qconsym :: { RdrName }
: consym { $1 }
- | QCONSYM { mkSrcQual dataName $1 }
+ | QCONSYM { mkQual dataName $1 }
consym :: { RdrName }
- : CONSYM { mkSrcUnqual dataName $1 }
+ : CONSYM { mkUnqual dataName $1 }
-----------------------------------------------------------------------------
-- VarSyms
| qvarsym1 { $1 }
qvarsym1 :: { RdrName }
-qvarsym1 : QVARSYM { mkSrcQual varName $1 }
+qvarsym1 : QVARSYM { mkQual varName $1 }
varsym :: { RdrName }
: varsym_no_minus { $1 }
- | '-' { mkSrcUnqual varName SLIT("-") }
+ | '-' { mkUnqual varName SLIT("-") }
varsym_no_minus :: { RdrName } -- varsym not including '-'
- : VARSYM { mkSrcUnqual varName $1 }
- | special_sym { mkSrcUnqual varName $1 }
+ : VARSYM { mkUnqual varName $1 }
+ | special_sym { mkUnqual varName $1 }
-- See comments with special_id
-- Miscellaneous (mostly renamings)
modid :: { ModuleName }
- : CONID { mkSrcModuleFS $1 }
+ : CONID { mkModuleNameFS $1 }
tycon :: { RdrName }
- : CONID { mkSrcUnqual tcClsName $1 }
+ : CONID { mkUnqual tcClsName $1 }
tyconop :: { RdrName }
- : CONSYM { mkSrcUnqual tcClsName $1 }
+ : CONSYM { mkUnqual tcClsName $1 }
qtycon :: { RdrName }
: tycon { $1 }
- | QCONID { mkSrcQual tcClsName $1 }
+ | QCONID { mkQual tcClsName $1 }
+
+qtyconop :: { RdrName }
+ : tyconop { $1 }
+ | QCONSYM { mkQual tcClsName $1 }
qtycls :: { RdrName }
: qtycon { $1 }
-----------------------------------------------------------------------------
{
+data ParseStuff = PModule RdrNameHsModule | PExpr RdrNameHsExpr
+
happyError :: P a
happyError buf PState{ loc = loc } = PFailed (srcParseErr buf loc)
}
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