Poratbility: do not use #removeAtIndex: under Pharo.
Pharo does not have #removeAtIndex: which is actually
and ANSI protocol. But Pharoers do not like ANSI and don't
give a shit about compatibility.
To workaround it, use super-ugly #respondsTo: test.
"{ Package: 'stx:goodies/petitparser' }"
PPDelegateParser subclass:#PPOptionalParser
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'PetitParser-Parsers'
!
!PPOptionalParser methodsFor:'parsing'!
parseOn: aPPContext
| element |
element := parser parseOn: aPPContext.
^ element isPetitFailure ifFalse: [ element ]
! !
!PPOptionalParser class methodsFor:'documentation'!
version_SVN
^ '$Id: PPOptionalParser.st,v 1.4 2014-03-04 14:33:10 cg Exp $'
! !