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 }"
PPCPass subclass:#PPCRewritingVisitor
instanceVariableNames:'change'
classVariableNames:''
poolDictionaries:''
category:'PetitCompiler-Visitors'
!
!PPCRewritingVisitor methodsFor:'as yet unclassified'!
change
self flag: 'JK: Do we need this?'.
change := true.
!
visitChild: child of: node
| newChild |
(self isOpen: child) ifTrue: [
"already processing..."
^ nil
].
(self isCached: child) ifTrue: [
"Use Cached Value"
node replace: child with: (self cachedValue: child).
^ nil
].
change := false.
newChild := self visit: child.
change ifTrue: [
node replace: child with: newChild.
].
!
visitChildren: node
node children do: [ :child |
self visitChild: child of: node
]
! !