compiler/PPCOptimizeChoices.st
author Jan Vrany <jan.vrany@fit.cvut.cz>
Tue, 12 May 2015 01:24:03 +0100
changeset 459 4751c407bb40
parent 452 9f4558b3be66
permissions -rw-r--r--
Merged with PetitCompiler-JanKurs.20150510144201, PetitCompiler-Tests-JanKurs.20150510144201, PetitCompiler-Extras-Tests-JanKurs.20150510144201, PetitCompiler-Benchmarks-JanKurs.20150510144201 Name: PetitCompiler-JanKurs.20150510144201 Author: JanKurs Time: 10-05-2015, 04:42:29.192 PM UUID: 58a4786b-1182-4904-8b44-a13d3918f244 Name: PetitCompiler-Tests-JanKurs.20150510144201 Author: JanKurs Time: 10-05-2015, 04:32:12.870 PM UUID: 2a8fd41a-331b-4dcf-a7a3-752a50ce86e7 Name: PetitCompiler-Extras-Tests-JanKurs.20150510144201 Author: JanKurs Time: 10-05-2015, 04:59:25.308 PM UUID: ef43bd1a-be60-4e88-b749-8b635622c969 Name: PetitCompiler-Benchmarks-JanKurs.20150510144201 Author: JanKurs Time: 10-05-2015, 05:04:54.561 PM UUID: d8e764fd-016b-46e2-9fc1-17c38c18f0e5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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