"{ Package: 'stx:goodies/petitparser' }"
PPCompositeParser subclass:#PPLambdaParser
instanceVariableNames:'expression abstraction application variable'
classVariableNames:''
poolDictionaries:''
category:'PetitTests-Examples'
!
!PPLambdaParser class methodsFor:'curch-booleans'!
and
^ self parse: '\p.\q.((p q) p)'
!
false
^ self parse: '\x.\y.y'
!
ifthenelse
^ self parse: '\p.p'
!
not
^ self parse: '\p.\a.\b.((p b) a)'
!
or
^ self parse: '\p.\q.((p p) q)'
!
true
^ self parse: '\x.\y.x'
! !
!PPLambdaParser methodsFor:'accessing'!
start
^ expression end
! !
!PPLambdaParser methodsFor:'productions'!
abstraction
^ $\ asParser token trim , variable , $. asParser token trim , expression ==> [ :node | Array with: node second with: node fourth ]
!
application
^ $( asParser token trim , expression , expression , $) asParser token trim ==> [ :node | Array with: node second with: node third ]
!
expression
^ variable / abstraction / application
!
variable
^ (#letter asParser , #word asParser star) token trim ==> [ :token | token value ]
! !
!PPLambdaParser class methodsFor:'documentation'!
version_SVN
^ '$Id: PPLambdaParser.st,v 1.2 2012-01-13 11:22:50 cg Exp $'
! !