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"{ Package: 'squeak:petitparser' }"
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PPPredicateParser subclass:#PPPredicateSequenceParser
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instanceVariableNames:'size'
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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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PPPredicateSequenceParser comment:'A parser that accepts if a given predicate on an arbitrary number of elements of the input sequence holds.
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Instance Variables:
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size <Integer> The number of elements to consume.'
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!
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!PPPredicateSequenceParser class methodsFor:'instance creation'!
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on: aBlock message: aString negated: aNegatedBlock message: aNegatedString size: anInteger
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^ self new initializeOn: aBlock message: aString negated: aNegatedBlock message: aNegatedString size: anInteger
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!
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on: aBlock message: aString size: anInteger
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^ self on: aBlock message: aString negated: [ :each | (aBlock value: each) not ] message: 'no ' , aString size: anInteger
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! !
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!PPPredicateSequenceParser methodsFor:'accessing'!
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size
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"Answer the sequence size of the receiver."
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^ size
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! !
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!PPPredicateSequenceParser methodsFor:'initialization'!
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initializeOn: aBlock message: aString negated: aNegatedBlock message: aNegatedString size: anInteger
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predicate := aBlock.
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predicateMessage := aString.
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negated := aNegatedBlock.
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negatedMessage := aNegatedString.
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size := anInteger
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! !
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!PPPredicateSequenceParser methodsFor:'operators'!
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negate
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"Answer a parser that is the negation of the receiving predicate parser."
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^ self class
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on: negated message: negatedMessage
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negated: predicate message: predicateMessage
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size: size
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! !
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!PPPredicateSequenceParser methodsFor:'parsing'!
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parseOn: aStream
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| position result |
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position := aStream position.
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result := aStream next: size.
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(result size = size and: [ predicate value: result ])
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ifTrue: [ ^ result ].
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aStream position: position.
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^ PPFailure message: predicateMessage at: aStream position
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! !
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!PPPredicateSequenceParser class methodsFor:'documentation'!
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version_SVN
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^ '$Id: PPPredicateSequenceParser.st,v 1.1 2011-08-18 18:56:17 cg Exp $'
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! !
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