compiler/PPCMergingVisitor.st
author Jan Vrany <jan.vrany@fit.cvut.cz>
Thu, 30 Apr 2015 23:43:14 +0200
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child 452 9f4558b3be66
permissions -rw-r--r--
Updated to PetitCompiler-JanKurs.100, PetitCompiler-Tests-JanKurs.44 and PetitCompiler-Benchmarks-JanKurs.4 Name: PetitCompiler-JanKurs.100 Author: JanKurs Time: 30-04-2015, 10:48:52.165 AM UUID: 80196870-5921-46d9-ac20-a43bf5c2f3c2 Name: PetitCompiler-Tests-JanKurs.44 Author: JanKurs Time: 30-04-2015, 10:49:22.489 AM UUID: 348c02e8-18ce-48f6-885d-fcff4516a298 Name: PetitCompiler-Benchmarks-JanKurs.4 Author: JanKurs Time: 30-04-2015, 10:58:44.890 AM UUID: 18cadb42-f9ef-45fb-82e9-8469ade56c8b
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"{ Package: 'stx:goodies/petitparser/compiler' }"
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"{ NameSpace: Smalltalk }"
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PPCRewritingVisitor subclass:#PPCMergingVisitor
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	instanceVariableNames:'nodeSet'
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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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!PPCMergingVisitor methodsFor:'as yet unclassified'!
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equivalentNode: node
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	^  nodeSet detect: [ :e | e = node ]
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!
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hasEquivalentNode: node
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	^ nodeSet includes: node
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!
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initialize
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	super initialize.
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	nodeSet := Set new
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!
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store: node
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	self assert: (self hasEquivalentNode: node) not.
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	nodeSet add: node
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!
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visitNode: node
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	super visitNode: node.
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	(self hasEquivalentNode: node) ifTrue: [
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		self change.
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		^ self equivalentNode: node
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	] ifFalse: [  
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		self store: node
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	].
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	^ node
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! !
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