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"{ Package: 'stx:libbasic2' }"
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PeekableStream subclass:#MultiReadStream
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instanceVariableNames:'streamStack'
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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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!MultiReadStream class methodsFor:'documentation'!
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documentation
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"
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Stacked streams. At any time, another stream can be stacked onto
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a stream stack. Making this streams contents to be returned before the
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rest. To the stream reader, this looks like a bunch of embedded streams.
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Useful when reading files which include each other, or to handle
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define-macro expansion in a c-parser.
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[instance variables:]
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"
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"Created: / 21-05-2010 / 14:34:48 / cg"
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!
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examples
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"
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|s|
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s := MultiReadStream on:('abcd' readStream).
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self assert:(s peek == $a).
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self assert:(s next == $a).
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s pushInputStream:('1234' readStream).
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self assert:(s next == $1).
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self assert:(s next == $2).
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s pushInputStream:('aa' readStream).
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self assert:(s next == $a).
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self assert:(s next == $a).
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self assert:(s atEnd not).
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self assert:(s next == $3).
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self assert:(s next == $4).
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self assert:(s next == $b).
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self assert:(s next == $c).
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self assert:(s next == $d).
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self assert:(s atEnd).
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self assert:(s peek == nil).
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self assert:(s next == nil).
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"
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"Created: / 21-05-2010 / 14:27:53 / cg"
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! !
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!MultiReadStream class methodsFor:'instance creation'!
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on:aReadStream
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^ self basicNew pushInputStream:aReadStream
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"Created: / 21-05-2010 / 14:26:03 / cg"
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! !
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!MultiReadStream methodsFor:'private'!
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checkCurrentStreamAtEnd
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[streamStack size > 1 and:[streamStack last atEnd]] whileTrue:[
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"keep the last stream, so that the #position kludge will work"
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self popInputStream
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].
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"Created: / 21-05-2010 / 14:30:20 / cg"
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! !
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!MultiReadStream methodsFor:'stream protocol'!
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atEnd
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self checkCurrentStreamAtEnd.
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^ streamStack isEmptyOrNil or:[streamStack last atEnd]
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"Created: / 21-05-2010 / 14:31:48 / cg"
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!
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contentsSpecies
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streamStack isEmptyOrNil ifTrue:[^ super contentsSpecies].
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^ streamStack first contentsSpecies
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"Created: / 21-05-2010 / 14:44:26 / cg"
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!
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next
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self checkCurrentStreamAtEnd.
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streamStack isEmptyOrNil ifTrue:[^ self pastEndRead].
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^ streamStack last next
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"Created: / 21-05-2010 / 14:31:23 / cg"
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!
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peek
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self checkCurrentStreamAtEnd.
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streamStack isEmptyOrNil ifTrue:[^ self pastEndRead].
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^ streamStack last peek
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"Created: / 21-05-2010 / 14:29:06 / cg"
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!
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position
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"/ thats depatable !!
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"/ the code below only makes sense, if we see the multiStream as some kind of
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"/ macro-expanding c-define stream
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streamStack isEmptyOrNil ifTrue:[
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"we assume we are at the beginning"
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^ 0
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].
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^ streamStack first position
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"Created: / 21-05-2010 / 14:52:40 / cg"
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!
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position0Based
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"/ thats depatable !!
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"/ the code below only makes sense, if we see the multiStream as some kind of
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"/ macro-expanding c-define stream
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streamStack isEmptyOrNil ifTrue:[
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"we assume we are at the beginning"
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^ 0
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].
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^ streamStack first position0Based
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"Created: / 21-05-2010 / 14:52:40 / cg"
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!
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position1Based
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"/ thats depatable !!
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"/ the code below only makes sense, if we see the multiStream as some kind of
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"/ macro-expanding c-define stream
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streamStack isEmptyOrNil ifTrue:[
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"we assume we are at the beginning"
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^ 1
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].
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^ streamStack first position1Based
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"Created: / 21-05-2010 / 14:52:40 / cg"
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!
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readStream
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^ self
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"Created: / 21-05-2010 / 14:51:05 / cg"
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! !
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!MultiReadStream methodsFor:'stream stacking'!
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popInputStream
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streamStack removeLast
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"Created: / 21-05-2010 / 14:25:30 / cg"
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!
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pushInputStream:aReadStream
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streamStack isNil ifTrue:[
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streamStack := OrderedCollection new.
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].
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streamStack add:aReadStream
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"Created: / 21-05-2010 / 14:25:17 / cg"
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! !
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!MultiReadStream class methodsFor:'documentation'!
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version_CVS
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^ '$Header: /cvs/stx/stx/libbasic2/MultiReadStream.st,v 1.5 2011-09-26 16:37:32 stefan Exp $'
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! !
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