Use #deepCopy instead of #copy when copying RB parse tree
...because #copy make a copy if child nodes but does not set their parents properly.
Therefore node replacing does not work because it replaces it in wrong tree (original,
not the copy).
"{ Package: 'stx:goodies/petitparser/compiler' }"
"{ NameSpace: Smalltalk }"
Object subclass:#PPCTokenGuard
instanceVariableNames:'node'
classVariableNames:''
poolDictionaries:''
category:'PetitCompiler-Guards'
!
!PPCTokenGuard class methodsFor:'as yet unclassified'!
on: node
^ self new
node: node;
yourself
! !
!PPCTokenGuard methodsFor:'as yet unclassified'!
firstToken
self assert: node firstSetWithTokens size = 1.
^ node firstSetWithTokens anyOne
!
makesSense
^ node firstSetWithTokens size = 1 and: [ node firstSetWithTokens anyOne isTokenNode ]
!
node
^ node
!
node: aPPCNode
node := aPPCNode
! !