"{ Package: 'stx:goodies/petitparser/compiler' }"

"{ NameSpace: Smalltalk }"

PPCDelegateNode subclass:#PPCOptionalNode
	instanceVariableNames:''
	classVariableNames:''
	poolDictionaries:''
	category:'PetitCompiler-Nodes'
!

!PPCOptionalNode methodsFor:'analyzing'!

isNullable
	^ true
! !

!PPCOptionalNode methodsFor:'as yet unclassified'!

acceptsEpsilon
	^ true
!

acceptsEpsilonOpenSet: set
	^ true
!

compileWith: compiler effect: effect id: id
	compiler startMethod: id.
	compiler addVariable: 'retval'.

	compiler add: 'retval := '.
	compiler callOnLine: (child compileWith: compiler ).
	compiler add: '^ error ifFalse: [ retval ] ifTrue: [ self clearError. nil ]'.
 ^ compiler stopMethod.
!

prefix
	^ #opt
! !