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"
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COPYRIGHT (c) 1989 by Claus Gittinger
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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Text subclass:#FileText
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instanceVariableNames:'myStream lastLineKnown lastLineOfFile
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cachedLines cacheLineNr'
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classVariableNames:''
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poolDictionaries:''
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category:'Collections-Text'
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!
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FileText comment:'
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COPYRIGHT (c) 1989 by Claus Gittinger
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All Rights Reserved
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$Header: /cvs/stx/stx/libbasic2/FileText.st,v 1.5 1994-06-02 11:35:33 claus Exp $
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'!
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!FileText class methodsFor:'documentation'!
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documentation
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"
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FileText represents the contents of a text-file;
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in core only the offsets of the text-lines are stored in an array
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to save space; the at: method fetches the line from the file.
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Individual textlines may be replaced by strings.
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the underlying file is NOT updated in this case.
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Care should be taken, if the underlying file is rewritten -
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you have to manually update/flush the pointers.
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Never rewrite the file using the data from a FileText.
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"
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! !
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!FileText class methodsFor:'instance creation'!
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of:aStream
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"return a new FileText object for the stream aStream"
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^ (self new:1) of:aStream
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!
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ofFile:aFileName
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"return a new FileText object for the named file"
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|aStream|
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aStream := FileStream readonlyFileNamed:aFileName.
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aStream isNil ifTrue:[^ nil].
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^ (self new:1) of:aStream
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! !
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!FileText methodsFor:'accessing'!
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of:aStream
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myStream := aStream.
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lastLineOfFile := nil.
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lastLineKnown := 0.
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cachedLines := nil
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! !
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!FileText methodsFor:'accessing'!
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at:index
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|entry oldPosition|
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(index > lastLineKnown) ifTrue:[
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self scanUpToLine:index.
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(lastLineOfFile notNil) ifTrue:[
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(index > lastLineOfFile) ifTrue:[
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1
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^ self subscriptBoundsError
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]
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]
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].
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entry := super at:index.
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(entry isMemberOf:String) ifTrue:[^ entry].
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cachedLines isNil ifTrue:[
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cachedLines := Array new:50.
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cacheLineNr := -9999
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].
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((index < cacheLineNr)
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or:[index >= (cacheLineNr + cachedLines size)]) ifTrue:[
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oldPosition := myStream position.
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myStream position:entry.
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1 to:(cachedLines size) do:[:cacheIndex|
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cachedLines at:cacheIndex put:(myStream nextLine)
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].
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myStream position:oldPosition.
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cacheLineNr := index
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].
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^ cachedLines at:(index - cacheLineNr + 1)
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!
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size
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"return the number of text-lines - have to scan file the first time"
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(lastLineOfFile isNil) ifTrue:[
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self scanUpToEnd
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].
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^ lastLineOfFile
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! !
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!FileText methodsFor:'enumerating'!
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do:aBlock
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self from:1 to:(self size) do:aBlock
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!
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from:index1 to:index2 do:aBlock
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"must be redefined back since elements are indices into file, not the elements themselfes"
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|index "{ Class: SmallInteger }"
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stop "{ Class: SmallInteger }" |
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index := index1.
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stop := index2.
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[index <= stop] whileTrue:[
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aBlock value:(self at:index).
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index := index + 1
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]
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! !
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!FileText methodsFor:'private'!
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scanUpToEnd
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"scan myStream up to the end of file"
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(lastLineOfFile notNil) ifTrue:[^ self].
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[true] whileTrue:[
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lastLineKnown := lastLineKnown + 1.
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(super size < lastLineKnown) ifTrue:[
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super grow:(super size * 2 + 1)
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].
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super at:lastLineKnown put:(myStream position).
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myStream skipLine isNil ifTrue:[
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lastLineOfFile := lastLineKnown.
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^ self
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]
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]
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!
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scanUpToLine:index
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"scan myStream up to line index and save line-start-positions"
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(lastLineOfFile notNil) ifTrue:[
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(index > lastLineOfFile) ifTrue:[^ self]
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].
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[lastLineKnown <= index] whileTrue:[
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lastLineKnown := lastLineKnown + 1.
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(super size < lastLineKnown) ifTrue:[
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super grow:(super size * 2 + 1)
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].
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super at:lastLineKnown put:(myStream position).
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myStream skipLine isNil ifTrue:[
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lastLineOfFile := lastLineKnown.
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^ self
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]
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]
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! !
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