compiler/PEGFsaEpsilonTransition.st
author Jan Vrany <jan.vrany@fit.cvut.cz>
Tue, 24 Nov 2015 19:37:14 +0100
changeset 553 d83cb4945d5e
parent 515 b5316ef15274
permissions -rw-r--r--
Oops, forgot to export PETITCOMPILER_DATA_DIRECTORY variable ...so Smalltalk code could not read it. Also fixed test for "include" scripts so they are not downloaded again when already downloaded.

"{ Package: 'stx:goodies/petitparser/compiler' }"

"{ NameSpace: Smalltalk }"

PEGFsaTransition subclass:#PEGFsaEpsilonTransition
	instanceVariableNames:''
	classVariableNames:''
	poolDictionaries:''
	category:'PetitCompiler-FSA'
!

!PEGFsaEpsilonTransition methodsFor:'gt'!

gtName
    | gtName |
    gtName := '<eps>'.
    priority < 0 ifTrue: [ gtName := gtName, ',', priority asString ].
    ^ gtName
! !

!PEGFsaEpsilonTransition methodsFor:'modifications'!

decreasePriorityBy: value
    "
        My value has special semantics, when I have negative priority, all the reachable states and transitions should
        be decreased by that value.
        
        In case I am preceded by another epsilon with negative priority, I do not decrease my value, that would multiply
        the the negative priority effect....
    "
    ^ self
! !

!PEGFsaEpsilonTransition methodsFor:'set operations'!

intersection: anotherState
    ^ anotherState
! !

!PEGFsaEpsilonTransition methodsFor:'testing'!

isEpsilon
    ^ true
!

isEpsilonTransition
    ^ true
! !