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"{ Package: 'stx:libbasic2' }"
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Stream subclass:#InternalPipeStream
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instanceVariableNames:'queue'
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classVariableNames:''
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poolDictionaries:''
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category:'Streams'
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!
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1016
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!InternalPipeStream class methodsFor:'documentation'!
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documentation
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"
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not useful on its own, but can be used to talk to a vt100
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terminal view ...
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See example.
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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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|p|
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p := InternalPipeStream new.
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[
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10 timesRepeat:[
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p nextPutLine:'hello'
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].
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] fork.
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[
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10 timesRepeat:[
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Transcript showCR:p nextLine
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].
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] fork.
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[exEnd]
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[exBegin]
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|userInput elizasOutput|
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userInput := InternalPipeStream new.
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elizasOutput := InternalPipeStream new.
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top := StandardSystemView new.
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terminal := VT100TerminalView openOnInput: userInput output:elizasOutput in:top.
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top extent:(terminal preferredExtent).
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top label:'The doctor is in'.
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top iconLabel:'doctor'.
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top open.
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top waitUntilVisible.
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terminal translateNLToCRNL:true.
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terminal inputTranslateCRToNL:true.
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terminal localEcho:true.
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elizasOutput nextPutLine:'Hi, I am Eliza'.
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elizasOutput nextPutLine:'What is your problem ?'.
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elizasOutput nextPutLine:''.
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elizasOutput nextPutAll:'>'.
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[top realized] whileTrue:[
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|line answer matchingRule|
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line := userInput nextLine.
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(#('quit' 'exit' 'end' 'bye') includes:line) ifTrue:[
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top destroy.
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^ self
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].
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answer := 'Tell me more.'
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elizasOutput nextPutLine:answer.
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elizasOutput nextPutAll:'>'.
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].
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[exEnd]
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"
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! !
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!InternalPipeStream class methodsFor:'instance creation'!
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new
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^ self basicNew initialize
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! !
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!InternalPipeStream methodsFor:'accessing'!
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atEnd
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^ false . "/ queue notNil
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!
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close
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queue := nil
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!
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next
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"return the next element from the stream (might block until something is written)"
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^ queue next
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!
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nextAvailableBytes:nMax into:aBuffer startingAt:startIndex
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|n idx ch|
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n := 0.
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idx := startIndex.
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[n <= nMax] whileTrue:[
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ch := queue nextIfEmpty:[^ n ].
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aBuffer at:idx put:ch.
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idx := idx + 1.
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n := n + 1
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].
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^ n
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!
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nextPut:something
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"write an element (might wakeup readers)"
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queue nextPut:something
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3128
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!
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size
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^ queue size
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! !
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!InternalPipeStream methodsFor:'initialization'!
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initialize
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queue := SharedQueue new.
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! !
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!InternalPipeStream methodsFor:'synchronization'!
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readWait
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queue readSemaphore wait
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! !
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!InternalPipeStream class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libbasic2/InternalPipeStream.st,v 1.3 2013-10-17 13:03:59 cg Exp $'
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! !
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3128
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