Portability fixes
* do not use Object>>asString. Not all Smalltalks implement it.
* do not use Object>>name. Not all Smalltalks implement it.
* do not use Dictionary keysAndValuesRemove:. Not all Smalltalks implement it.
* do not use Class>>methods The semantics is different among Smalltalks.
Use `Class methodDictionary values` instead.
* do not modify dictionary in #at:ifAbsentPut: block!
"{ Package: 'stx:goodies/petitparser/compiler' }"
"{ NameSpace: Smalltalk }"
PPCNode subclass:#PPCNilNode
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'PetitCompiler-Nodes'
!
!PPCNilNode methodsFor:'accessing'!
defaultName
^ #nil
! !
!PPCNilNode methodsFor:'analysis'!
acceptsEpsilon
^ true
!
firstCharSet
^ PPCharSetPredicate on: [:e | false ]
!
isNullable
^ true
! !
!PPCNilNode methodsFor:'visiting'!
accept: visitor
^ visitor visitNilNode: self
! !
!PPCNilNode class methodsFor:'documentation'!
version_HG
^ '$Changeset: <not expanded> $'
! !