PPStartOfWordParser.st
author Jan Vrany <jan.vrany@fit.cvut.cz>
Mon, 13 Apr 2015 22:00:44 +0100
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Merged JK's version from Monticello Name: PetitParser-JanKurs.275 Author: JanKurs Time: 31-03-2015, 05:51:24.398 PM UUID: 9ab3be24-8393-4794-a7e6-e318f3195673 Name: PetitTests-JanKurs.73 Author: JanKurs Time: 21-02-2015, 01:10:13.115 PM UUID: de4f77e3-2d07-476b-855e-69f845edfc7c
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"{ Package: 'stx:goodies/petitparser' }"
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"{ NameSpace: Smalltalk }"
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PPParser subclass:#PPStartOfWordParser
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	instanceVariableNames:''
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	classVariableNames:''
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	poolDictionaries:''
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	category:'PetitParser-Parsers'
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!
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!PPStartOfWordParser methodsFor:'as yet unclassified'!
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acceptsEpsilon
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	^ true
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!
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parseOn: aPPContext
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	aPPContext atEnd ifTrue: [  
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		^ PPFailure message: 'Start of word expected' context: aPPContext at: aPPContext position 
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	].
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	(aPPContext position == 0) ifTrue: [ 
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		(aPPContext peek isAlphaNumeric) ifTrue: [ 
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			^ #startOfWord
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		] ifFalse: [ 
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			^ PPFailure message: 'Start of word expected' context: aPPContext at: aPPContext position 
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	 	]
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	].
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	aPPContext back.
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	aPPContext peek isAlphaNumeric ifTrue: [
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		^ PPFailure message: 'Start of word expected' context: aPPContext at: aPPContext position 
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	].
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	aPPContext next.
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	^ aPPContext peek isAlphaNumeric ifTrue: [ #startOfWord ] ifFalse: [ 
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		PPFailure message: 'Start of word expected' context: aPPContext at: aPPContext position 
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	]
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! !
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