--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/PPConditionalParser.st Mon Apr 13 22:00:44 2015 +0100
@@ -0,0 +1,33 @@
+"{ Package: 'stx:goodies/petitparser' }"
+
+"{ NameSpace: Smalltalk }"
+
+PPDelegateParser subclass:#PPConditionalParser
+ instanceVariableNames:'block'
+ classVariableNames:''
+ poolDictionaries:''
+ category:'PetitParser-Parsers'
+!
+
+!PPConditionalParser class methodsFor:'as yet unclassified'!
+
+on: aPPParser block: block
+ ^ (PPConditionalParser on: aPPParser)
+ block: block;
+ yourself
+! !
+
+!PPConditionalParser methodsFor:'accessing'!
+
+block: aBlock
+ block := aBlock
+! !
+
+!PPConditionalParser methodsFor:'parsing'!
+
+parseOn: aPPContext
+ ^ (block value: aPPContext)
+ ifTrue: [ parser parseOn: aPPContext ]
+ ifFalse: [ PPFailure message: block asString, ' was not evaluated to true.' context: aPPContext ]
+! !
+