compiler/PPCRewritingVisitor.st
author Jan Vrany <jan.vrany@fit.cvut.cz>
Wed, 26 Aug 2015 23:01:00 +0100
changeset 532 132d7898a2a1
parent 452 9f4558b3be66
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.
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"{ Package: 'stx:goodies/petitparser/compiler' }"
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"{ NameSpace: Smalltalk }"
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132d7898a2a1 PPCConfiguration refactoring: [4/10]: introduced a class - PPCPass
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PPCPass subclass:#PPCRewritingVisitor
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	instanceVariableNames:'change'
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	classVariableNames:''
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	poolDictionaries:''
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	category:'PetitCompiler-Visitors'
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!
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!PPCRewritingVisitor methodsFor:'as yet unclassified'!
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change
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    self flag: 'JK: Do we need this?'.
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    change := true.
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!
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visitChild: child of: node
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    | newChild |
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    (self isOpen: child) ifTrue: [ 
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        "already processing..."
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        ^ nil
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    ].
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    (self isCached: child) ifTrue: [ 
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        "Use Cached Value"
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        node replace: child with: (self cachedValue: child).
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        ^ nil
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    ]. 
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    change := false.
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    newChild := self visit: child.
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    change ifTrue: [ 
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        node replace: child with: newChild.
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    ].
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!
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visitChildren: node
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    node children do: [ :child | 
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        self visitChild: child of: node
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    ]
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! !
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