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"{ Package: 'stx:libbasic' }"
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WriteStream subclass:#TextCollectorStream
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instanceVariableNames:'access lineLimit partialLastLine'
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classVariableNames:''
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poolDictionaries:''
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category:'Streams-Misc'
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!
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!TextCollectorStream class methodsFor:'documentation'!
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documentation
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"
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a textCollectorStream is much like a regular writeStream.
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In addition to collecting characters, it does a delayed update
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of its collection, and may be used as a model for a TextView to
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work like a TextCollector.
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Currently ListViews are optimezed for StringCollections as model.
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So stream on a StringCollection for best performance.
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[author:]
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Stefan Vogel
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[see also:]
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WriteStream
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TextCollector StringCollection
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"
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!
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examples
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"
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[exBegin]
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|s|
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s := TextCollectorStream on:StringCollection new.
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s show:'Hello '.
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s showCR:'World'.
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s contents inspect
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[exEnd]
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"
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!
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history
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"Created: 18.2.1997 / 13:18:17 / stefan"
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! !
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!TextCollectorStream class methodsFor:'defaults'!
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defaultLineLimit
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"the number of lines remembered by default"
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^ 600
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"Created: 18.2.1997 / 14:41:38 / stefan"
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! !
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!TextCollectorStream methodsFor:'accessing'!
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access
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"return the value of the instance variable 'access' (automatically generated)"
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^ access
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"Created: 19.2.1997 / 09:01:21 / stefan"
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!
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access:something
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"set the value of the instance variable 'access' (automatically generated)"
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access := something.
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"Created: 19.2.1997 / 09:01:21 / stefan"
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!
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lineLimit
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"return the value of the instance variable 'lineLimit' (automatically generated)"
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^ lineLimit
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"Created: 19.2.1997 / 09:01:21 / stefan"
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!
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lineLimit:something
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"set the value of the instance variable 'lineLimit' (automatically generated)"
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lineLimit := something.
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"Created: 19.2.1997 / 09:01:21 / stefan"
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! !
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!TextCollectorStream methodsFor:'initialization'!
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initialize
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super initialize.
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"/ access := RecursionLock new.
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lineLimit := self class defaultLineLimit.
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"first line is empty"
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partialLastLine := false.
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"Created: 18.2.1997 / 14:39:50 / stefan"
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"Modified: 19.2.1997 / 11:59:01 / stefan"
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!
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on:aCollection
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self initialize.
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^ super on:aCollection.
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"Created: 19.2.1997 / 08:59:45 / stefan"
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!
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on:aCollection from:start to:end
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self initialize.
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^ super on:aCollection from:start to:end.
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"Created: 19.2.1997 / 09:00:07 / stefan"
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!
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with:aCollection
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self initialize.
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^ super with:aCollection.
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"Created: 19.2.1997 / 09:00:24 / stefan"
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! !
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!TextCollectorStream methodsFor:'writing'!
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nextPut:anObject
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"an Object may be a Character (cr or nl), or anything
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responding to #printString."
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|string newPartialLastLine size|
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(writeLimit notNil
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and:[position >= writeLimit]) ifTrue:[
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WriteError raiseErrorString:'write beyond writeLimit'
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].
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anObject isCharacter ifTrue:[
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((anObject == Character cr) or:[anObject == Character nl]) ifTrue:[
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partialLastLine ifFalse:[
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collection add:''. "add empty line"
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position := position + 1.
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].
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partialLastLine := false.
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^ anObject.
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].
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].
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string := anObject printString.
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(string includes:Character cr) ifTrue:[
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newPartialLastLine := (string last ~= Character cr).
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string := string asStringCollection.
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partialLastLine ifTrue:[
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string at:1 put:((collection removeLast ? ''), (string at:1)).
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].
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size := collection size + string size.
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size > lineLimit ifTrue:[
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collection removeFirst:(size - lineLimit min:(collection size)).
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position := lineLimit.
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].
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collection addAll:string.
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position := position + string size.
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partialLastLine := newPartialLastLine.
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] ifFalse:[
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partialLastLine ifTrue:[
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collection add:((collection removeLast ? ''), string).
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] ifFalse:[
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collection add:string.
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position := position + 1.
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].
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partialLastLine := true.
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].
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^ anObject
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"Created: 18.2.1997 / 14:29:51 / stefan"
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"Modified: 19.2.1997 / 11:47:37 / stefan"
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!
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show:anObject
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self nextPut:anObject
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"Created: 18.2.1997 / 17:20:53 / stefan"
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!
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showCR:anObject
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self nextPut:anObject; nextPut:Character cr
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"Created: 18.2.1997 / 17:21:12 / stefan"
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! !
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!TextCollectorStream class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libbasic/TextCollectorStream.st,v 1.2 2006-04-06 10:54:06 stefan Exp $'
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! !
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