compiler/PPCStarAnyNode.st
author Jan Vrany <jan.vrany@fit.cvut.cz>
Wed, 26 Aug 2015 23:01:00 +0100
changeset 532 132d7898a2a1
parent 515 b5316ef15274
child 534 a949c4fe44df
permissions -rw-r--r--
PPCConfiguration refactoring: [4/10]: introduced a class - PPCPass ... representing a compilation pass over the PPCNode tree. The pass has a common api method: #run:in: which is not used in PPCConfiguration. This simplifed the code and removed some code duplication.

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

"{ NameSpace: Smalltalk }"

PPCStarNode subclass:#PPCStarAnyNode
	instanceVariableNames:''
	classVariableNames:''
	poolDictionaries:''
	category:'PetitCompiler-Nodes'
!

!PPCStarAnyNode methodsFor:'as yet unclassified'!

defaultName
    ^ #starAny
! !

!PPCStarAnyNode methodsFor:'first follow next'!

firstSets: aFirstDictionary into: aSet suchThat: aBlock
    "
        First and follow should be performed on the non-specialized tree, i.e. on a tree
        with star -> messageNode. Not on myself.
        
        The reason for that is, that:
        - I am terminal
        - I am nullable
        
        This means, I look like epsilon node for the first follow analysis. And epsilons 
        are ignored in sequences, thus sequence of StarMessagePredicate, Literal
        leads to { Literal } as firstSet and not expected { MessagePredicate, Literal }
    "
    ^ self error: 'Cannot perform first/follow analysis on myself, sorry for that :('
! !

!PPCStarAnyNode methodsFor:'visiting'!

accept: visitor
    ^ visitor visitStarAnyNode: self
! !