"{ Package: 'stx:goodies/petitparser' }"
PPCompositeParser subclass:#PPArithmeticParser
instanceVariableNames:'terms addition factors multiplication power primary parentheses
number'
classVariableNames:''
poolDictionaries:''
category:'PetitTests-Examples'
!
!PPArithmeticParser methodsFor:'accessing'!
start
^ terms end
! !
!PPArithmeticParser methodsFor:'grammar'!
addition
^ (factors separatedBy: ($+ asParser / $- asParser) token trim)
foldLeft: [ :a :op :b | a perform: op value asSymbol with: b ]
!
factors
^ multiplication / power
!
multiplication
^ (power separatedBy: ($* asParser / $/ asParser) token trim)
foldLeft: [ :a :op :b | a perform: op value asSymbol with: b ]
!
number
^ ($- asParser optional , #digit asParser plus , ($. asParser , #digit asParser plus) optional) token trim ==> [ :token | token value asNumber ]
!
parentheses
^ $( asParser flatten trim , terms , $) asParser flatten trim ==> #second
!
power
^ (primary separatedBy: $^ asParser token trim) foldRight: [ :a :op :b | a raisedTo: b ]
!
primary
^ number / parentheses
!
terms
^ addition / factors
! !
!PPArithmeticParser class methodsFor:'documentation'!
version_SVN
^ '$Id: PPArithmeticParser.st,v 1.2 2012-01-13 11:22:50 cg Exp $'
! !