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400
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FilteringStream subclass:#FilteringLineStream
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instanceVariableNames:'lineBuffer'
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399
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classVariableNames:''
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poolDictionaries:''
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category:'Streams'
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!
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!FilteringLineStream class methodsFor:'documentation'!
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examples
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"
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400
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filter all comments from a file:
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|in filter|
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in := 'Makefile' asFilename readStream.
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filter := FilteringLineStream basicNew.
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filter inputStream:in.
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filter filter:[:line | (line startsWith:'#') ifTrue:[line] ifFalse:[nil]].
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filter outputStream:Transcript.
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filter filterUpToEnd
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feed a second filter from the first filters output:
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399
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|in filter1 filter2|
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in := 'Makefile' asFilename readStream.
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filter1 := FilteringLineStream basicNew.
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filter1 inputStream:in.
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filter1 filter:[:line | (line startsWith:'#') ifTrue:[line] ifFalse:[nil]].
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filter2 := FilteringLineStream basicNew.
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filter2 filter:[:line | (line startsWith:'#-') ifTrue:[line] ifFalse:[nil]].
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filter1 outputStream:filter2.
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filter2 outputStream:Transcript.
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filter1 filterUpToEnd
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"
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! !
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!FilteringLineStream methodsFor:'access - push-writing'!
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cr
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"finish a line, push it filtered into the outputStream"
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|output|
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lineBuffer isNil ifTrue:[lineBuffer := ''].
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output := filter value:lineBuffer.
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output notNil ifTrue:[
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outputStream nextPutAll:output.
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outputStream cr.
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].
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lineBuffer := ''.
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"Created: 2.7.1996 / 20:55:53 / cg"
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"Modified: 2.7.1996 / 21:03:07 / cg"
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!
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nextPut:something
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"collect a line and push it when a cr arrives"
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something == Character cr ifTrue:[
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self cr
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] ifFalse:[
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lineBuffer isNil ifTrue:[lineBuffer := ''].
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lineBuffer := lineBuffer copyWith:something.
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]
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"Created: 2.7.1996 / 20:54:38 / cg"
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"Modified: 2.7.1996 / 21:03:26 / cg"
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!
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nextPutAll:something
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"collect a line and push it when a cr arrives"
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lineBuffer isNil ifTrue:[lineBuffer := ''].
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lineBuffer := lineBuffer , something.
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"Created: 2.7.1996 / 20:54:45 / cg"
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"Modified: 2.7.1996 / 21:03:30 / cg"
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! !
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91 |
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!FilteringLineStream class methodsFor:'documentation'!
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version
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400
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^ '$Header: /cvs/stx/stx/libbasic2/FilteringLineStream.st,v 1.2 1996-07-02 19:27:59 cg Exp $'
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399
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! !
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