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 }"
PPCDelegateNode subclass:#PPCOptionalNode
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'PetitCompiler-Nodes'
!
!PPCOptionalNode methodsFor:'accessing'!
defaultName
^ #opt
! !
!PPCOptionalNode methodsFor:'analysis'!
acceptsEpsilon
^ true
!
acceptsEpsilonOpenSet: set
^ true
!
isNullable
^ true
! !
!PPCOptionalNode methodsFor:'visiting'!
accept: visitor
^ visitor visitOptionalNode: self
! !