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"{ Package: 'stx:goodies/petitparser' }"
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Object subclass:#PPToken
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instanceVariableNames:'collection start stop'
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classVariableNames:''
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poolDictionaries:''
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category:'PetitParser-Core'
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!
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PPToken comment:'PPToken represents a parsed part of the input stream. Contrary to a simple String it remembers where it came from, the original collection and its start and stop position.
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Instance Variables:
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collection <SequenceableCollection> The collection this token comes from.
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start <Integer> The start position in the collection.
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stop <Integer> The stop position in the collection.'
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!
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!PPToken class methodsFor:'instance creation'!
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new
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self error: 'Token can only be created using a dedicated constructor.'
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!
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on: aSequenceableCollection
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^ self on: aSequenceableCollection start: 1 stop: aSequenceableCollection size
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!
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on: aSequenceableCollection start: aStartInteger stop: aStopInteger
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^ self basicNew
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initializeOn: aSequenceableCollection
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start: aStartInteger stop: aStopInteger
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! !
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!PPToken methodsFor:'accessing'!
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collection
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"Answer the underlying collection of this token."
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^ collection
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size
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"Answer the size of this token."
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^ stop - start + 1
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start
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"Answer the start position of this token in the underlying collection."
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^ start
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stop
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"Answer the stop position of this token in the underlying collection."
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^ stop
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value
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"Answer the contents of this token."
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^ collection copyFrom: start to: stop
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! !
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!PPToken methodsFor:'comparing'!
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= anObject
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^ self class = anObject class and: [ self value = anObject value ]
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!
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hash
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^ self value hash
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! !
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!PPToken methodsFor:'copying'!
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copyFrom: aStartInteger to: aStopInteger
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^ self class on: collection start: start + aStartInteger - 1 stop: stop + aStopInteger - 3
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! !
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!PPToken methodsFor:'initialization'!
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initializeOn: aSequenceableCollection start: aStartInteger stop: aStopInteger
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collection := aSequenceableCollection.
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start := aStartInteger.
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stop := aStopInteger
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! !
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!PPToken methodsFor:'printing'!
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printOn: aStream
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super printOn: aStream.
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aStream nextPut: $(; nextPutAll: self value; nextPut: $)
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! !
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!PPToken methodsFor:'private'!
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newline
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"Parser a platform independent newline sequence. LF: Unix, CR+LF: Windows, and CR: Apple."
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^ (Character lf asParser)
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/ (Character cr asParser , Character lf asParser optional)
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! !
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!PPToken methodsFor:'querying'!
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column
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"Answer the column number of this token in the underlying collection."
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4
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0
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| position |
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position := 0.
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(self newline , [ :stream |
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start <= stream position
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ifTrue: [ ^ start - position ].
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position := stream position ] asParser
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/ #any asParser) star
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parse: collection.
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^ start - position
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!
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line
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"Answer the line number of this token in the underlying collection."
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0
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| line |
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line := 1.
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(self newline , [ :stream |
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start <= stream position
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ifTrue: [ ^ line ].
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line := line + 1 ] asParser
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/ #any asParser) star
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parse: collection.
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^ line
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! !
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!PPToken class methodsFor:'documentation'!
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version_SVN
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^ '$Id: PPToken.st,v 1.2 2012-01-13 11:22:50 cg Exp $'
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! !
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