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' }"
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 $'
! !