author | Claus Gittinger <cg@exept.de> |
Mon, 03 Jun 2013 20:39:54 +0200 | |
changeset 15357 | 10a1cd767648 |
parent 15353 | 0a60d904c4c0 |
child 15615 | f67e9f5cd22a |
child 18066 | 89d51443ba6f |
permissions | -rw-r--r-- |
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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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"{ Package: 'stx:libbasic' }" |
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PeekableStream subclass:#PositionableStream |
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instanceVariableNames:'collection position readLimit writeLimit' |
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classVariableNames:'ZeroPosition InvalidPositionErrorSignal' |
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poolDictionaries:'' |
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category:'Streams' |
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! |
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||
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!PositionableStream class methodsFor:'documentation'! |
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copyright |
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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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|
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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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! |
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|
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documentation |
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" |
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Instances of PositionableStream allow positioning the read pointer. |
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The PositionableStream class also adds methods for source-chunk reading |
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and writing, and for filing-in/out of source code. |
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This is an abstract class. |
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Compatibility Notice: |
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In previous versions of ST/X, streams started with a 1-position (i.e. as in collections), |
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while ST-80 has always been using 0-based postions for streams and 1-based positions for collections. |
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THIS CERTAINLY IS BAD. |
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Although this is confusing ST/X has been changed to now also use 0-based stream positioning. |
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[author:] |
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Claus Gittinger |
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" |
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! ! |
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!PositionableStream class methodsFor:'initialization'! |
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initialize |
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ZeroPosition := 0. "/ changed with stx rel5.1; |
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"/ rel6.2: no longer used (i.e. 0 has now ben hardcoded) |
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"/ class variable to be eliminated. |
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InvalidPositionErrorSignal isNil ifTrue:[ |
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InvalidPositionErrorSignal := PositionOutOfBoundsError. |
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InvalidPositionErrorSignal notifierString:'position out of bounds: '. |
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] |
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! ! |
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!PositionableStream class methodsFor:'instance creation'! |
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on:aCollection |
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"return a new PositionableStream streaming on aCollection" |
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^ (self basicNew) on:aCollection |
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! |
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on:aCollection from:first to:last |
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"return a new PositionableStream streaming on aCollection |
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from first to last" |
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^ (self basicNew) on:aCollection from:first to:last |
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! |
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with:aCollection |
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"return a new PositionableStream streaming on aCollection, |
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the stream is positioned to the end of the collection." |
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^ (self basicNew) with:aCollection |
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! ! |
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!PositionableStream class methodsFor:'Signal constants'! |
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invalidPositionErrorSignal |
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"return the signal raised if positioning is attempted to an |
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invalid position (i.e. before the begin of the stream or after |
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the end)" |
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^ PositionOutOfBoundsError |
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! ! |
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!PositionableStream class methodsFor:'constants'! |
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zeroPosition |
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"return the number, which marks the initial position. |
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Compatibility Notice: |
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In previous versions of ST/X, streams started with a 1-position (i.e. as in collections), |
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while ST-80 has always been using 0-based postions for streams and 1-based positions for collections. |
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|
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Although this is confusing ST/X has been changed to now also use 0-based stream positioning. |
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" |
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^ 0 |
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"Modified: / 13-07-2006 / 20:36:54 / cg" |
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! ! |
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!PositionableStream methodsFor:'Compatibility-Dolphin'! |
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endChunk |
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self nextPutChunkSeparator |
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! ! |
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!PositionableStream methodsFor:'Compatibility-ST/V'! |
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skipTo:anElement |
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"ST/V compatibility: |
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skip for the element given by the argument, anElement; |
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return nil if not found, self otherwise. |
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On a successful match, the next read will return the element after anElement." |
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^ self skipThrough:anElement |
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" |
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|s| |
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s := ReadStream on:'12345678901234567890'. |
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s skipTo:$5. |
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s copyFrom:1 to:(s position). |
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s upToEnd |
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" |
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! ! |
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||
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!PositionableStream methodsFor:'accessing'! |
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String new -> uninitializedNew: / basicNew:
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collection |
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String new -> uninitializedNew: / basicNew:
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^ collection |
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! |
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contents |
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"return the entire contents of the stream" |
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^ collection |
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! |
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peek |
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"look ahead for and return the next element" |
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|peekObject| |
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peekObject := self next. |
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self backStep. |
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^ peekObject |
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! |
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||
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peekForAll:aCollection |
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"return true and advance if the next elements are the same |
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as aCollection. |
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otherwise stay and let the position unchanged" |
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|oldPos| |
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oldPos := self position. |
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(self next:(aCollection size)) = aCollection ifTrue:[ |
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^ true |
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]. |
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self position:oldPos. |
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^ false |
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"Created: 1.3.1997 / 15:11:25 / cg" |
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! |
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readLimit |
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"return the read-limit; thats the position at which EOF is returned" |
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|
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^ readLimit |
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"Created: / 30.10.1998 / 16:47:04 / cg" |
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! |
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|
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readLimit:aNumber |
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"set the read-limit; thats the position at which EOF is returned" |
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readLimit := aNumber |
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! |
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setCollection:newCollection |
199 |
collection := newCollection |
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! |
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writeLimit:aNumber |
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"set the writeLimit; thats the position after which writing is prohibited" |
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writeLimit := aNumber |
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" |
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|s| |
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s := WriteStream on:String new. |
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s nextPutAll:'hello world'. |
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s contents. |
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|s| |
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s := WriteStream on:String new. |
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s writeLimit:5. |
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s nextPutAll:'hello world'. |
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s contents. |
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" |
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"Modified: / 04-06-2007 / 17:21:55 / cg" |
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! ! |
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||
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!PositionableStream methodsFor:'positioning'! |
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backStep |
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"move backward read position by one" |
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self position:(self position - 1) |
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! |
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position |
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"return the read position" |
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||
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^ self position0Based |
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! |
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position0Based |
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"return the read position 0-based" |
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^ position |
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! |
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|
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position0Based:index0Based |
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"set the read (or write) position" |
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((index0Based > readLimit) or:[index0Based < 0]) ifTrue: [^ self positionError:index0Based]. |
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position := index0Based |
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! |
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|
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position1Based |
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"return the read position 1-based" |
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^ self position0Based + 1 |
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! |
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|
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position1Based:index1Based |
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"set the read (or write) position" |
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self position0Based:(index1Based - 1) |
4405 | 261 |
|
262 |
" |
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263 |
|s| |
|
264 |
||
265 |
s := '1234567890' readStream. |
|
266 |
s next:5. |
|
267 |
s position:1. |
|
268 |
s next:7. |
|
269 |
" |
|
270 |
||
271 |
" |
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272 |
|s| |
|
273 |
||
274 |
s := '' writeStream. |
|
275 |
s nextPutAll:'1234567890'. |
|
276 |
s position:5. |
|
277 |
s nextPutAll:'abcdefg'. |
|
278 |
s contents |
|
279 |
" |
|
280 |
||
281 |
" |
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282 |
|s| |
|
283 |
||
284 |
s := '' writeStream. |
|
285 |
s nextPutAll:'1234567890'. |
|
286 |
s position:0. |
|
287 |
s nextPutAll:'abcdefg'. |
|
288 |
s contents |
|
289 |
" |
|
611 | 290 |
! |
291 |
||
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position:newPos |
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"set the read (or write) position" |
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|
15348 | 295 |
^ self position0Based:newPos |
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|
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" |
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|s| |
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|
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300 |
s := '1234567890' readStream. |
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301 |
s next:5. |
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s position:1. |
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s next:7. |
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" |
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#positionStartingAt0 and #positionStartingAt1
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|
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" |
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|s| |
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|
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309 |
s := '' writeStream. |
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310 |
s nextPutAll:'1234567890'. |
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311 |
s position:5. |
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312 |
s nextPutAll:'abcdefg'. |
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313 |
s contents |
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314 |
" |
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#positionStartingAt0 and #positionStartingAt1
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|
7052
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
316 |
" |
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
317 |
|s| |
6626
f7b08d6bee3f
#positionStartingAt0 and #positionStartingAt1
Stefan Vogel <sv@exept.de>
parents:
6538
diff
changeset
|
318 |
|
7052
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
319 |
s := '' writeStream. |
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
320 |
s nextPutAll:'1234567890'. |
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
321 |
s position:0. |
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
322 |
s nextPutAll:'abcdefg'. |
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
323 |
s contents |
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
324 |
" |
6626
f7b08d6bee3f
#positionStartingAt0 and #positionStartingAt1
Stefan Vogel <sv@exept.de>
parents:
6538
diff
changeset
|
325 |
! |
f7b08d6bee3f
#positionStartingAt0 and #positionStartingAt1
Stefan Vogel <sv@exept.de>
parents:
6538
diff
changeset
|
326 |
|
611 | 327 |
reset |
328 |
"set the read position to the beginning of the collection" |
|
329 |
||
5308 | 330 |
self resetPosition |
331 |
||
332 |
" |
|
333 |
|s| |
|
334 |
||
335 |
s := 'hello world' readStream. |
|
336 |
Transcript showCR:(s next:5). |
|
337 |
s reset. |
|
338 |
Transcript showCR:(s next:10). |
|
339 |
" |
|
340 |
! |
|
341 |
||
342 |
resetPosition |
|
343 |
"set the read position to the beginning of the collection" |
|
344 |
||
15348 | 345 |
position := 0 |
4405 | 346 |
|
347 |
" |
|
348 |
|s| |
|
349 |
||
350 |
s := 'hello world' readStream. |
|
351 |
Transcript showCR:(s next:5). |
|
352 |
s reset. |
|
353 |
Transcript showCR:(s next:10). |
|
354 |
" |
|
611 | 355 |
! |
356 |
||
357 |
setToEnd |
|
11433 | 358 |
"set the read position to the end of the collection. |
359 |
#next will return EOF, #nextPut: will append to the stream. |
|
360 |
(same Behavior as FileStream." |
|
611 | 361 |
|
15348 | 362 |
position := readLimit |
611 | 363 |
! |
364 |
||
365 |
skip:numberToSkip |
|
366 |
"skip the next numberToSkip elements" |
|
367 |
||
5774 | 368 |
numberToSkip ~~ 0 ifTrue:[ |
7051
984d8271d06b
preps for 0-based stream positions
Claus Gittinger <cg@exept.de>
parents:
6924
diff
changeset
|
369 |
self position:(self position + numberToSkip) |
5774 | 370 |
] |
1489
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
371 |
! |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
372 |
|
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
373 |
skipThroughAll:aCollection |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
374 |
"skip for and through the sequence given by the argument, aCollection; |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
375 |
return nil if not found, self otherwise. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
376 |
On a successful match, the next read will return elements after aCollection; |
2153
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
377 |
if no match was found, the receiver will be positioned at the end. |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
378 |
This is redefined here, to make use of positioning." |
1489
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
379 |
|
7054
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
380 |
|buffer len first idx| |
1489
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
381 |
|
7054
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
382 |
len := aCollection size. |
1489
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
383 |
first := aCollection at:1. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
384 |
[self atEnd] whileFalse:[ |
7054
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
385 |
buffer := self nextAvailable:len. |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
386 |
buffer = aCollection ifTrue:[ |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
387 |
^ self |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
388 |
]. |
10357
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
389 |
buffer size == len ifTrue:[ |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
390 |
"expect more input" |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
391 |
idx := buffer indexOf:first startingAt:2. |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
392 |
idx == 0 ifFalse:[ |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
393 |
self position:(self position - len + idx - 1) |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
394 |
]. |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
395 |
]. |
1489
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
396 |
]. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
397 |
^ nil |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
398 |
|
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
399 |
" |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
400 |
|s| |
10357
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
401 |
s := ReadStream on:'12345678901234567890a'. |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
402 |
s skipThroughAll:'90ab'. |
1489
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
403 |
s upToEnd |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
404 |
" |
2153
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
405 |
" |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
406 |
|s| |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
407 |
s := ReadStream on:'12345678901234567890'. |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
408 |
s skipThroughAll:'1234'. |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
409 |
s upToEnd |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
410 |
" |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
411 |
" |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
412 |
|s| |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
413 |
s := ReadStream on:'12345678901234567890'. |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
414 |
s skipThroughAll:'999'. |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
415 |
s atEnd |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
416 |
" |
1489
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
417 |
|
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
418 |
"Created: 26.6.1996 / 09:35:35 / cg" |
2154
89e96599e1e2
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2153
diff
changeset
|
419 |
"Modified: 11.1.1997 / 19:16:38 / cg" |
1489
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
420 |
! |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
421 |
|
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
422 |
skipToAll:aCollection |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
423 |
"skip for the sequence given by the argument, aCollection; |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
424 |
return nil if not found, self otherwise. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
425 |
On a successful match, the next read will return elements of aCollection." |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
426 |
|
7054
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
427 |
|oldPos buffer len first idx| |
1489
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
428 |
|
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
429 |
oldPos := self position. |
7054
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
430 |
len := aCollection size. |
1489
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
431 |
first := aCollection at:1. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
432 |
[self atEnd] whileFalse:[ |
10357
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
433 |
buffer := self nextAvailable:len. |
7054
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
434 |
buffer = aCollection ifTrue:[ |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
435 |
self position:(self position - len). |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
436 |
^ self |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
437 |
]. |
10357
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
438 |
buffer size == len ifTrue:[ |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
439 |
"more input can be expected" |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
440 |
idx := buffer indexOf:first startingAt:2. |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
441 |
idx == 0 ifFalse:[ |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
442 |
self position:(self position - len + idx - 1) |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
443 |
]. |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
444 |
]. |
1489
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
445 |
]. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
446 |
self position:oldPos. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
447 |
^ nil |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
448 |
|
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
449 |
" |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
450 |
|s| |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
451 |
s := ReadStream on:'12345678901234567890'. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
452 |
s skipToAll:'901'. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
453 |
s upToEnd |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
454 |
" |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
455 |
|
10357
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
456 |
" |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
457 |
|s| |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
458 |
s := ReadStream on:'1234567890'. |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
459 |
s skipToAll:'901'. |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
460 |
s upToEnd |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
461 |
" |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
462 |
|
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
463 |
" |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
464 |
|s| |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
465 |
s := 'Makefile' asFilename readStream. |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
466 |
[ |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
467 |
(s skipToAll:'EDIT') notNil ifTrue:[ |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
468 |
s next:100. |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
469 |
]. |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
470 |
] ensure:[ |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
471 |
s close. |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
472 |
] |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
473 |
" |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
474 |
|
1489
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
475 |
"Modified: 26.6.1996 / 09:28:27 / cg" |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
476 |
"Created: 26.6.1996 / 09:35:06 / cg" |
44 | 477 |
! ! |
611 | 478 |
|
10357
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
479 |
!PositionableStream methodsFor:'printing & storing'! |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
480 |
|
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
481 |
printOn:aStream |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
482 |
aStream nextPutAll:self className; nextPutAll:'(on:'; nextPutAll:collection classNameWithArticle; nextPut:$) |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
483 |
|
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
484 |
" |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
485 |
'' readStream printString |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
486 |
'' writeStream printString |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
487 |
" |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
488 |
! ! |
66543e405aa4
Fix #skipToAll: (partial match at end of stream
Stefan Vogel <sv@exept.de>
parents:
10001
diff
changeset
|
489 |
|
611 | 490 |
!PositionableStream methodsFor:'private'! |
491 |
||
492 |
contentsSpecies |
|
493 |
"return a class of which instances will be returned, when |
|
494 |
parts of the collection are asked for. |
|
495 |
(see upTo-kind of methods in subclasses)" |
|
496 |
||
497 |
^ collection species |
|
498 |
! |
|
499 |
||
500 |
on:aCollection |
|
501 |
"setup for streaming on aCollection" |
|
502 |
||
503 |
collection := aCollection. |
|
504 |
readLimit := aCollection size. |
|
13379 | 505 |
readLimit == 0 ifTrue:[ |
506 |
self assert:(aCollection isCollection) |
|
507 |
]. |
|
15348 | 508 |
position := 0 |
611 | 509 |
! |
510 |
||
511 |
on:aCollection from:first to:last |
|
512 |
"setup for streaming on aCollection from first to last" |
|
513 |
||
514 |
collection := aCollection. |
|
15348 | 515 |
position := first - 1. |
611 | 516 |
readLimit := last |
517 |
! |
|
518 |
||
519 |
positionError |
|
1998 | 520 |
"{ Pragma: +optSpace }" |
521 |
||
2966 | 522 |
"report an error when positioning past the end |
523 |
or before the beginning." |
|
611 | 524 |
|
8320
229adaeaf183
Use exception classes instead of class vars
Stefan Vogel <sv@exept.de>
parents:
8318
diff
changeset
|
525 |
^ PositionOutOfBoundsError raiseRequestWith:nil |
4452
3d050f505a0a
Raise proceedable signals proceedable.
Stefan Vogel <sv@exept.de>
parents:
4416
diff
changeset
|
526 |
|
3d050f505a0a
Raise proceedable signals proceedable.
Stefan Vogel <sv@exept.de>
parents:
4416
diff
changeset
|
527 |
"Modified: / 26.7.1999 / 10:59:13 / stefan" |
611 | 528 |
! |
529 |
||
6314 | 530 |
positionError:badPostition |
531 |
"{ Pragma: +optSpace }" |
|
532 |
||
533 |
"report an error when positioning past the end |
|
534 |
or before the beginning." |
|
535 |
||
8320
229adaeaf183
Use exception classes instead of class vars
Stefan Vogel <sv@exept.de>
parents:
8318
diff
changeset
|
536 |
^ PositionOutOfBoundsError raiseRequestWith:badPostition |
6314 | 537 |
! |
538 |
||
611 | 539 |
with:aCollection |
540 |
"setup for streaming to the end of aCollection" |
|
541 |
||
542 |
collection := aCollection. |
|
11434 | 543 |
readLimit := aCollection size. |
611 | 544 |
self setToEnd |
11434 | 545 |
|
546 |
" |
|
547 |
(WriteStream with:#(1 2 3 4 5)) |
|
548 |
nextPut:6; |
|
549 |
contents |
|
550 |
" |
|
611 | 551 |
! ! |
552 |
||
3170
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
553 |
!PositionableStream methodsFor:'reading'! |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
554 |
|
9003 | 555 |
nextAvailable:count |
556 |
|end result| |
|
557 |
||
558 |
end := position + count. |
|
15357 | 559 |
end >= readLimit ifTrue:[ |
9003 | 560 |
end := readLimit. |
561 |
]. |
|
562 |
||
15348 | 563 |
result := collection copyFrom:position+1 to:end. |
9003 | 564 |
position := end. |
565 |
^ result. |
|
566 |
||
567 |
" |
|
568 |
'abc' readStream nextAvailable:1. |
|
569 |
'abc' readStream nextAvailable:2. |
|
570 |
'abc' readStream nextAvailable:3. |
|
571 |
'abc' readStream nextAvailable:4. |
|
572 |
||
573 |
'abc' readStream nextAvailable:2; nextAvailable:2. |
|
574 |
'abc' readStream nextAvailable:3; nextAvailable:3. |
|
575 |
" |
|
576 |
! |
|
577 |
||
3170
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
578 |
upToAll:aCollection |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
579 |
"read until a subcollection consisisting of the elements in aCollection |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
580 |
is encountered. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
581 |
Return everything read excluding the elements in aCollection. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
582 |
The position is left before the collection; i.e. the next |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
583 |
read operations will return those elements. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
584 |
If no such subcollection is encountered, all elements up to the end |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
585 |
are read and returned. |
6494 | 586 |
See also #throughAll: which also reads up to some objects |
3170
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
587 |
but positions behind it and DOES include it in the returned |
3184
d99302322139
Ok, #upToAll: positions after the collection.
Stefan Vogel <sv@exept.de>
parents:
3170
diff
changeset
|
588 |
collection. |
6494 | 589 |
See also #upToAllExcluding:, which returns the same, but leaves the |
590 |
read pointer after the matched subcollection. |
|
3184
d99302322139
Ok, #upToAll: positions after the collection.
Stefan Vogel <sv@exept.de>
parents:
3170
diff
changeset
|
591 |
|
d99302322139
Ok, #upToAll: positions after the collection.
Stefan Vogel <sv@exept.de>
parents:
3170
diff
changeset
|
592 |
Note: this behavior is inconsistent with the other upTo.. methods, |
15159
b94bdee97afa
Changed usage of deprecated #copyWithoutLast: to #copyButLast:
Stefan Vogel <sv@exept.de>
parents:
14934
diff
changeset
|
593 |
which position after the found item. We implement the method |
b94bdee97afa
Changed usage of deprecated #copyWithoutLast: to #copyButLast:
Stefan Vogel <sv@exept.de>
parents:
14934
diff
changeset
|
594 |
this way for the sake of ST80-compatibility." |
3170
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
595 |
|
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
596 |
|answerStream element last rslt| |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
597 |
|
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
598 |
last := aCollection last. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
599 |
answerStream := WriteStream on:(self contentsSpecies new). |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
600 |
[self atEnd] whileFalse:[ |
15159
b94bdee97afa
Changed usage of deprecated #copyWithoutLast: to #copyButLast:
Stefan Vogel <sv@exept.de>
parents:
14934
diff
changeset
|
601 |
element := self next. |
b94bdee97afa
Changed usage of deprecated #copyWithoutLast: to #copyButLast:
Stefan Vogel <sv@exept.de>
parents:
14934
diff
changeset
|
602 |
answerStream nextPut:element. |
b94bdee97afa
Changed usage of deprecated #copyWithoutLast: to #copyButLast:
Stefan Vogel <sv@exept.de>
parents:
14934
diff
changeset
|
603 |
element == last ifTrue:[ |
b94bdee97afa
Changed usage of deprecated #copyWithoutLast: to #copyButLast:
Stefan Vogel <sv@exept.de>
parents:
14934
diff
changeset
|
604 |
((rslt := answerStream contents) endsWith:aCollection) ifTrue:[ |
b94bdee97afa
Changed usage of deprecated #copyWithoutLast: to #copyButLast:
Stefan Vogel <sv@exept.de>
parents:
14934
diff
changeset
|
605 |
self position:(self position - aCollection size). |
b94bdee97afa
Changed usage of deprecated #copyWithoutLast: to #copyButLast:
Stefan Vogel <sv@exept.de>
parents:
14934
diff
changeset
|
606 |
^ rslt copyButLast:aCollection size |
b94bdee97afa
Changed usage of deprecated #copyWithoutLast: to #copyButLast:
Stefan Vogel <sv@exept.de>
parents:
14934
diff
changeset
|
607 |
] |
b94bdee97afa
Changed usage of deprecated #copyWithoutLast: to #copyButLast:
Stefan Vogel <sv@exept.de>
parents:
14934
diff
changeset
|
608 |
]. |
3170
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
609 |
]. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
610 |
^ answerStream contents |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
611 |
|
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
612 |
" |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
613 |
|s| |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
614 |
s := ReadStream on:'hello world'. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
615 |
Transcript show:'<'; show:(s upToAll:'wo'); showCR:'>'. |
6494 | 616 |
Transcript showCR:s atEnd. |
3170
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
617 |
Transcript show:'<'; show:(s upToEnd); showCR:'>'. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
618 |
" |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
619 |
" |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
620 |
|s| |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
621 |
s := ReadStream on:'hello world'. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
622 |
Transcript show:'<'; show:(s upToAll:'xx'); showCR:'>'. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
623 |
Transcript showCR:s atEnd. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
624 |
Transcript show:'<'; show:(s upToEnd); showCR:'>'. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
625 |
" |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
626 |
|
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
627 |
"Modified: / 12.1.1998 / 22:06:42 / cg" |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
628 |
"Created: / 12.1.1998 / 22:07:01 / cg" |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
629 |
! ! |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
630 |
|
611 | 631 |
!PositionableStream methodsFor:'testing'! |
632 |
||
633 |
atEnd |
|
634 |
"return true, if the read-position is at the end" |
|
635 |
||
15357 | 636 |
^ position >= readLimit |
611 | 637 |
! |
638 |
||
639 |
isEmpty |
|
640 |
"return true, if the contents of the stream is empty" |
|
641 |
||
642 |
^ readLimit == 0 |
|
9006 | 643 |
! |
644 |
||
10577 | 645 |
isInternalByteStream |
646 |
"return true, if the stream is an internal stream reading bytes" |
|
647 |
||
648 |
^ collection class isBytes |
|
649 |
||
650 |
"Created: / 30-05-2007 / 16:16:12 / cg" |
|
651 |
! |
|
652 |
||
9006 | 653 |
isPositionable |
654 |
"return true, if the stream supports positioning (this one is)" |
|
655 |
||
656 |
^ true |
|
611 | 657 |
! ! |
658 |
||
1897 | 659 |
!PositionableStream class methodsFor:'documentation'! |
701 | 660 |
|
661 |
version |
|
15357 | 662 |
^ '$Header: /cvs/stx/stx/libbasic/PositionableStream.st,v 1.159 2013-06-03 18:39:54 cg Exp $' |
13379 | 663 |
! |
664 |
||
665 |
version_CVS |
|
15357 | 666 |
^ '$Header: /cvs/stx/stx/libbasic/PositionableStream.st,v 1.159 2013-06-03 18:39:54 cg Exp $' |
701 | 667 |
! ! |
6777
5efddf5358b2
currentFileInDirectory query
Claus Gittinger <cg@exept.de>
parents:
6707
diff
changeset
|
668 |
|
14934 | 669 |
|
611 | 670 |
PositionableStream initialize! |