islands/PPNonEmptyParser.st
author Jan Vrany <jan.vrany@fit.cvut.cz>
Sun, 10 May 2015 14:20:24 +0100
changeset 454 a9cd5ea7cc36
parent 387 e2b2ccaa4de6
child 504 0fb1f0799fc1
permissions -rw-r--r--
Portability: fixes for Smalltalk/X * Do not use detect:ifFound: - not present in Smalltalk/X * Removed leftover debugging code (Halt if:, ...) * Do not use `aClass methods`, use `aClass methodDictionary values` * Do not use #allPairsDo; - not present in Smalltalk/X * Do not use #crShow: - not present in Smalltalk/X * On Smalltalk?X use Filename - there's no FileReference in Smalltalk/X * Do not use CharacterSet, use String
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"{ Package: 'stx:goodies/petitparser/islands' }"
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"{ NameSpace: Smalltalk }"
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PPDelegateParser subclass:#PPNonEmptyParser
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	instanceVariableNames:''
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	classVariableNames:''
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	poolDictionaries:''
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	category:'PetitIslands-Parsers'
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!
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PPNonEmptyParser comment:'I return failure, if the delegate parser did not consumed any input.'
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!
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!PPNonEmptyParser methodsFor:'parsing'!
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parseOn: aPPContext
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	| position result |
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	position := aPPContext position.
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	result := parser parseOn: aPPContext.
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	(((position == aPPContext position) and: [ aPPContext atEnd not ]) and: [ result isPetitFailure not ]) ifTrue: [ 
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		^ PPFailure message: 'Epsilon parse not allowed' context: aPPContext at: position
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	].
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	^ result
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! !
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