author | Stefan Vogel <sv@exept.de> |
Thu, 21 Sep 2006 17:42:44 +0200 | |
changeset 10001 | 3f9586203b24 |
parent 9434 | 8700cca5c249 |
child 10357 | 66543e405aa4 |
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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!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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32 |
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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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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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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|
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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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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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^ ZeroPosition |
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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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!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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String new -> uninitializedNew: / basicNew:
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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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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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|
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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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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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!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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ZeroPosition == 0 ifTrue:[ |
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^ self position0Based |
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] ifFalse:[ |
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^ self position1Based |
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]. |
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! |
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position0Based |
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"return the read position 0-based" |
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|
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^ position - ZeroPosition |
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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 + ZeroPosition |
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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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242 |
self position0Based:(index1Based - 1) |
4405 | 243 |
|
244 |
" |
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245 |
|s| |
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246 |
||
247 |
s := '1234567890' readStream. |
|
248 |
s next:5. |
|
249 |
s position:1. |
|
250 |
s next:7. |
|
251 |
" |
|
252 |
||
253 |
" |
|
254 |
|s| |
|
255 |
||
256 |
s := '' writeStream. |
|
257 |
s nextPutAll:'1234567890'. |
|
258 |
s position:5. |
|
259 |
s nextPutAll:'abcdefg'. |
|
260 |
s contents |
|
261 |
" |
|
262 |
||
263 |
" |
|
264 |
|s| |
|
265 |
||
266 |
s := '' writeStream. |
|
267 |
s nextPutAll:'1234567890'. |
|
268 |
s position:0. |
|
269 |
s nextPutAll:'abcdefg'. |
|
270 |
s contents |
|
271 |
" |
|
611 | 272 |
! |
273 |
||
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274 |
position:newPos |
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275 |
"set the read (or write) position" |
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|
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ZeroPosition == 0 ifTrue:[ |
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278 |
^ self position0Based:newPos |
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279 |
] ifFalse:[ |
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280 |
^ self position1Based:newPos |
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281 |
]. |
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|
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" |
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|s| |
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|
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s := '1234567890' readStream. |
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287 |
s next:5. |
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288 |
s position:1. |
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289 |
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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293 |
|s| |
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|
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295 |
s := '' writeStream. |
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diff
changeset
|
296 |
s nextPutAll:'1234567890'. |
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
297 |
s position:5. |
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
298 |
s nextPutAll:'abcdefg'. |
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
299 |
s contents |
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
300 |
" |
6626
f7b08d6bee3f
#positionStartingAt0 and #positionStartingAt1
Stefan Vogel <sv@exept.de>
parents:
6538
diff
changeset
|
301 |
|
7052
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
302 |
" |
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
303 |
|s| |
6626
f7b08d6bee3f
#positionStartingAt0 and #positionStartingAt1
Stefan Vogel <sv@exept.de>
parents:
6538
diff
changeset
|
304 |
|
7052
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
305 |
s := '' writeStream. |
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
306 |
s nextPutAll:'1234567890'. |
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
307 |
s position:0. |
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
308 |
s nextPutAll:'abcdefg'. |
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
309 |
s contents |
207cc9c62982
prep for 0-based stream position
Claus Gittinger <cg@exept.de>
parents:
7051
diff
changeset
|
310 |
" |
6626
f7b08d6bee3f
#positionStartingAt0 and #positionStartingAt1
Stefan Vogel <sv@exept.de>
parents:
6538
diff
changeset
|
311 |
! |
f7b08d6bee3f
#positionStartingAt0 and #positionStartingAt1
Stefan Vogel <sv@exept.de>
parents:
6538
diff
changeset
|
312 |
|
611 | 313 |
reset |
314 |
"set the read position to the beginning of the collection" |
|
315 |
||
5308 | 316 |
self resetPosition |
317 |
||
318 |
" |
|
319 |
|s| |
|
320 |
||
321 |
s := 'hello world' readStream. |
|
322 |
Transcript showCR:(s next:5). |
|
323 |
s reset. |
|
324 |
Transcript showCR:(s next:10). |
|
325 |
" |
|
326 |
! |
|
327 |
||
328 |
resetPosition |
|
329 |
"set the read position to the beginning of the collection" |
|
330 |
||
7114 | 331 |
position := ZeroPosition |
4405 | 332 |
|
333 |
" |
|
334 |
|s| |
|
335 |
||
336 |
s := 'hello world' readStream. |
|
337 |
Transcript showCR:(s next:5). |
|
338 |
s reset. |
|
339 |
Transcript showCR:(s next:10). |
|
340 |
" |
|
611 | 341 |
! |
342 |
||
343 |
setToEnd |
|
344 |
"set the read position to the end of the collection" |
|
345 |
||
7114 | 346 |
position := readLimit - 1 + ZeroPosition |
611 | 347 |
! |
348 |
||
349 |
skip:numberToSkip |
|
350 |
"skip the next numberToSkip elements" |
|
351 |
||
5774 | 352 |
numberToSkip ~~ 0 ifTrue:[ |
7051
984d8271d06b
preps for 0-based stream positions
Claus Gittinger <cg@exept.de>
parents:
6924
diff
changeset
|
353 |
self position:(self position + numberToSkip) |
5774 | 354 |
] |
1489
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
355 |
! |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
356 |
|
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
357 |
skipThroughAll:aCollection |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
358 |
"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
|
359 |
return nil if not found, self otherwise. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
360 |
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
|
361 |
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
|
362 |
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
|
363 |
|
7054
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
364 |
|buffer len first idx| |
1489
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
365 |
|
7054
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
366 |
len := aCollection size. |
1489
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
367 |
first := aCollection at:1. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
368 |
[self atEnd] whileFalse:[ |
7054
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
369 |
buffer := self nextAvailable:len. |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
370 |
buffer = aCollection ifTrue:[ |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
371 |
^ self |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
372 |
]. |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
373 |
idx := buffer indexOf:first startingAt:2. |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
374 |
idx == 0 ifFalse:[ |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
375 |
self position:(self position - len + idx - 1) |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
376 |
] |
1489
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
377 |
]. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
378 |
^ nil |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
379 |
|
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
380 |
" |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
381 |
|s| |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
382 |
s := ReadStream on:'12345678901234567890'. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
383 |
s skipThroughAll:'901'. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
384 |
s upToEnd |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
385 |
" |
2153
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
386 |
" |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
387 |
|s| |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
388 |
s := ReadStream on:'12345678901234567890'. |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
389 |
s skipThroughAll:'1234'. |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
390 |
s upToEnd |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
391 |
" |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
392 |
" |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
393 |
|s| |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
394 |
s := ReadStream on:'12345678901234567890'. |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
395 |
s skipThroughAll:'999'. |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
396 |
s atEnd |
244e36cbbd9b
skipThroughAll: does not need the old position
Claus Gittinger <cg@exept.de>
parents:
2130
diff
changeset
|
397 |
" |
1489
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 |
"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
|
400 |
"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
|
401 |
! |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
402 |
|
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
403 |
skipToAll:aCollection |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
404 |
"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
|
405 |
return nil if not found, self otherwise. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
406 |
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
|
407 |
|
7054
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
408 |
|oldPos buffer len first idx| |
1489
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
409 |
|
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
410 |
oldPos := self position. |
7054
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
411 |
len := aCollection size. |
1489
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
412 |
first := aCollection at:1. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
413 |
[self atEnd] whileFalse:[ |
7054
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
414 |
buffer := self next:len. |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
415 |
buffer = aCollection ifTrue:[ |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
416 |
self position:(self position - len). |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
417 |
^ self |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
418 |
]. |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
419 |
idx := buffer indexOf:first startingAt:2. |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
420 |
idx == 0 ifFalse:[ |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
421 |
self position:(self position - len + idx - 1) |
685d359f9847
code rewritten to be independent of stream zero-base
Claus Gittinger <cg@exept.de>
parents:
7053
diff
changeset
|
422 |
] |
1489
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
423 |
]. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
424 |
self position:oldPos. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
425 |
^ nil |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
426 |
|
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
427 |
" |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
428 |
|s| |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
429 |
s := ReadStream on:'12345678901234567890'. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
430 |
s skipToAll:'901'. |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
431 |
s upToEnd |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
432 |
" |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
433 |
|
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
434 |
"Modified: 26.6.1996 / 09:28:27 / cg" |
9e3b166483fb
moved some skip methods from readStream;
Claus Gittinger <cg@exept.de>
parents:
1420
diff
changeset
|
435 |
"Created: 26.6.1996 / 09:35:06 / cg" |
44 | 436 |
! ! |
611 | 437 |
|
438 |
!PositionableStream methodsFor:'private'! |
|
439 |
||
440 |
contentsSpecies |
|
441 |
"return a class of which instances will be returned, when |
|
442 |
parts of the collection are asked for. |
|
443 |
(see upTo-kind of methods in subclasses)" |
|
444 |
||
445 |
^ collection species |
|
446 |
! |
|
447 |
||
448 |
on:aCollection |
|
449 |
"setup for streaming on aCollection" |
|
450 |
||
451 |
collection := aCollection. |
|
452 |
readLimit := aCollection size. |
|
7114 | 453 |
position := ZeroPosition |
611 | 454 |
! |
455 |
||
456 |
on:aCollection from:first to:last |
|
457 |
"setup for streaming on aCollection from first to last" |
|
458 |
||
459 |
collection := aCollection. |
|
7114 | 460 |
position := first - 1 + ZeroPosition. |
611 | 461 |
readLimit := last |
462 |
! |
|
463 |
||
464 |
positionError |
|
1998 | 465 |
"{ Pragma: +optSpace }" |
466 |
||
2966 | 467 |
"report an error when positioning past the end |
468 |
or before the beginning." |
|
611 | 469 |
|
8320
229adaeaf183
Use exception classes instead of class vars
Stefan Vogel <sv@exept.de>
parents:
8318
diff
changeset
|
470 |
^ PositionOutOfBoundsError raiseRequestWith:nil |
4452
3d050f505a0a
Raise proceedable signals proceedable.
Stefan Vogel <sv@exept.de>
parents:
4416
diff
changeset
|
471 |
|
3d050f505a0a
Raise proceedable signals proceedable.
Stefan Vogel <sv@exept.de>
parents:
4416
diff
changeset
|
472 |
"Modified: / 26.7.1999 / 10:59:13 / stefan" |
611 | 473 |
! |
474 |
||
6314 | 475 |
positionError:badPostition |
476 |
"{ Pragma: +optSpace }" |
|
477 |
||
478 |
"report an error when positioning past the end |
|
479 |
or before the beginning." |
|
480 |
||
8320
229adaeaf183
Use exception classes instead of class vars
Stefan Vogel <sv@exept.de>
parents:
8318
diff
changeset
|
481 |
^ PositionOutOfBoundsError raiseRequestWith:badPostition |
6314 | 482 |
! |
483 |
||
611 | 484 |
with:aCollection |
485 |
"setup for streaming to the end of aCollection" |
|
486 |
||
487 |
collection := aCollection. |
|
6230 | 488 |
readLimit := aCollection size + 1. |
611 | 489 |
self setToEnd |
490 |
! ! |
|
491 |
||
3170
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
492 |
!PositionableStream methodsFor:'reading'! |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
493 |
|
9003 | 494 |
nextAvailable:count |
495 |
|end result| |
|
496 |
||
497 |
end := position + count. |
|
498 |
(end - ZeroPosition + 1) > readLimit ifTrue:[ |
|
499 |
end := readLimit. |
|
500 |
]. |
|
501 |
||
502 |
result := collection copyFrom:position+1-ZeroPosition to:end. |
|
503 |
position := end. |
|
504 |
^ result. |
|
505 |
||
506 |
" |
|
507 |
'abc' readStream nextAvailable:1. |
|
508 |
'abc' readStream nextAvailable:2. |
|
509 |
'abc' readStream nextAvailable:3. |
|
510 |
'abc' readStream nextAvailable:4. |
|
511 |
||
512 |
'abc' readStream nextAvailable:2; nextAvailable:2. |
|
513 |
'abc' readStream nextAvailable:3; nextAvailable:3. |
|
514 |
" |
|
515 |
! |
|
516 |
||
3170
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
517 |
upToAll:aCollection |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
518 |
"read until a subcollection consisisting of the elements in aCollection |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
519 |
is encountered. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
520 |
Return everything read excluding the elements in aCollection. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
521 |
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
|
522 |
read operations will return those elements. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
523 |
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
|
524 |
are read and returned. |
6494 | 525 |
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
|
526 |
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
|
527 |
collection. |
6494 | 528 |
See also #upToAllExcluding:, which returns the same, but leaves the |
529 |
read pointer after the matched subcollection. |
|
3184
d99302322139
Ok, #upToAll: positions after the collection.
Stefan Vogel <sv@exept.de>
parents:
3170
diff
changeset
|
530 |
|
d99302322139
Ok, #upToAll: positions after the collection.
Stefan Vogel <sv@exept.de>
parents:
3170
diff
changeset
|
531 |
Note: this behavior is inconsistent with the other upTo.. methods, |
7051
984d8271d06b
preps for 0-based stream positions
Claus Gittinger <cg@exept.de>
parents:
6924
diff
changeset
|
532 |
which position after the found item. We implement the method |
984d8271d06b
preps for 0-based stream positions
Claus Gittinger <cg@exept.de>
parents:
6924
diff
changeset
|
533 |
this way for the sake of ST80-compatibility." |
3170
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
534 |
|
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
535 |
|answerStream element last rslt| |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
536 |
|
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
537 |
last := aCollection last. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
538 |
answerStream := WriteStream on:(self contentsSpecies new). |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
539 |
[self atEnd] whileFalse:[ |
7051
984d8271d06b
preps for 0-based stream positions
Claus Gittinger <cg@exept.de>
parents:
6924
diff
changeset
|
540 |
element := self next. |
984d8271d06b
preps for 0-based stream positions
Claus Gittinger <cg@exept.de>
parents:
6924
diff
changeset
|
541 |
answerStream nextPut:element. |
984d8271d06b
preps for 0-based stream positions
Claus Gittinger <cg@exept.de>
parents:
6924
diff
changeset
|
542 |
element == last ifTrue:[ |
984d8271d06b
preps for 0-based stream positions
Claus Gittinger <cg@exept.de>
parents:
6924
diff
changeset
|
543 |
((rslt := answerStream contents) endsWith:aCollection) ifTrue:[ |
984d8271d06b
preps for 0-based stream positions
Claus Gittinger <cg@exept.de>
parents:
6924
diff
changeset
|
544 |
self position:(self position - aCollection size). |
984d8271d06b
preps for 0-based stream positions
Claus Gittinger <cg@exept.de>
parents:
6924
diff
changeset
|
545 |
^ rslt copyWithoutLast:aCollection size |
984d8271d06b
preps for 0-based stream positions
Claus Gittinger <cg@exept.de>
parents:
6924
diff
changeset
|
546 |
] |
984d8271d06b
preps for 0-based stream positions
Claus Gittinger <cg@exept.de>
parents:
6924
diff
changeset
|
547 |
]. |
3170
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
548 |
]. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
549 |
^ answerStream contents |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
550 |
|
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
551 |
" |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
552 |
|s| |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
553 |
s := ReadStream on:'hello world'. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
554 |
Transcript show:'<'; show:(s upToAll:'wo'); showCR:'>'. |
6494 | 555 |
Transcript showCR:s atEnd. |
3170
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
556 |
Transcript show:'<'; show:(s upToEnd); showCR:'>'. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
557 |
" |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
558 |
" |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
559 |
|s| |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
560 |
s := ReadStream on:'hello world'. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
561 |
Transcript show:'<'; show:(s upToAll:'xx'); showCR:'>'. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
562 |
Transcript showCR:s atEnd. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
563 |
Transcript show:'<'; show:(s upToEnd); showCR:'>'. |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
564 |
" |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
565 |
|
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
566 |
"Modified: / 12.1.1998 / 22:06:42 / cg" |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
567 |
"Created: / 12.1.1998 / 22:07:01 / cg" |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
568 |
! ! |
7b299d83c45a
moved upToAll: to positionableStream.
Claus Gittinger <cg@exept.de>
parents:
3032
diff
changeset
|
569 |
|
611 | 570 |
!PositionableStream methodsFor:'testing'! |
571 |
||
572 |
atEnd |
|
573 |
"return true, if the read-position is at the end" |
|
574 |
||
7114 | 575 |
^ (position - ZeroPosition + 1) > readLimit |
611 | 576 |
! |
577 |
||
578 |
isEmpty |
|
579 |
"return true, if the contents of the stream is empty" |
|
580 |
||
581 |
^ readLimit == 0 |
|
9006 | 582 |
! |
583 |
||
584 |
isPositionable |
|
585 |
"return true, if the stream supports positioning (this one is)" |
|
586 |
||
587 |
^ true |
|
611 | 588 |
! ! |
589 |
||
1897 | 590 |
!PositionableStream class methodsFor:'documentation'! |
701 | 591 |
|
592 |
version |
|
10001
3f9586203b24
remove methods that are the identical to superclasses methods
Stefan Vogel <sv@exept.de>
parents:
9434
diff
changeset
|
593 |
^ '$Header: /cvs/stx/stx/libbasic/PositionableStream.st,v 1.148 2006-09-21 15:42:44 stefan Exp $' |
701 | 594 |
! ! |
6777
5efddf5358b2
currentFileInDirectory query
Claus Gittinger <cg@exept.de>
parents:
6707
diff
changeset
|
595 |
|
611 | 596 |
PositionableStream initialize! |