" The and-predicate, a parser that succeeds whenever its delegate does, but does not consume the input stream [Parr 1994, 1995]. " Class { #name : 'PPAndParser', #superclass : 'PPDelegateParser', #category : 'PetitParser-Parsers' } { #category : 'operators' } PPAndParser >> and [ ^ self ] { #category : 'parsing' } PPAndParser >> parseOn: aPPContext [ | element memento | memento := aPPContext remember. element := parser parseOn: aPPContext. aPPContext restore: memento. ^ element ]