compiler/PPCOptimizeChoices.st
author Jan Vrany <jan.vrany@fit.cvut.cz>
Mon, 18 Jan 2016 08:05:03 +0000
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permissions -rw-r--r--
For tests on Pharo 5.0, use Spur VM
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"{ Package: 'stx:goodies/petitparser/compiler' }"
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"{ NameSpace: Smalltalk }"
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PPCRewritingVisitor subclass:#PPCOptimizeChoices
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	instanceVariableNames:''
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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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!PPCOptimizeChoices methodsFor:'as yet unclassified'!
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hasCommonPrefix: nodes
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    | firstSets firstSetValues |
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    firstSets := IdentityDictionary new.
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    nodes do: [ :node |
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        firstSets at: node put: node firstSetWithProductions.
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    ].
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    firstSetValues := firstSets values.
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    firstSetValues do: [ :p1 |
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        firstSetValues do:[ :p2 | 
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            (p1 = p2) ifFalse: [ ^ false ] 
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        ].
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    ].
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    ^ true
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    "Modified: / 10-05-2015 / 07:32:39 / Jan Vrany <jan.vrany@fit.cvut.cz>"
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!
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visitChoiceNode: node
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    | firstSets commonPrefix |
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    firstSets := IdentityDictionary new.
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    node children do: [ :child |
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        firstSets at: child put: child firstProductions.
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    ].
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    commonPrefix := true.
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    firstSets values allPairsDo: [ :p1 :p2 | (p1 = p2) ifFalse: [ commonPrefix := false ] ].
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! !
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