Codegen refactoring [1/x]: Introduced a PPCCodeBlock
A PPCCodeBlock is an abstraction of a block of statements with temporaries. This will
allow for scoped temporary management in code generator - temporary variables could
be allocated for block only. (i.e., make them block-temporaries)
"{ Package: 'stx:goodies/petitparser/compiler' }"
"{ NameSpace: Smalltalk }"
PPCStarNode subclass:#PPCStarAnyNode
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'PetitCompiler-Nodes'
!
!PPCStarAnyNode methodsFor:'as yet unclassified'!
prefix
^ #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
! !