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writestream.st
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1992-02-15
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"======================================================================
|
| WriteStream Method Definitions
|
======================================================================"
"======================================================================
|
| Copyright (C) 1990, 1991, 1992 Free Software Foundation, Inc.
| Written by Steve Byrne.
|
| This file is part of GNU Smalltalk.
|
| GNU Smalltalk is free software; you can redistribute it and/or modify it
| under the terms of the GNU General Public License as published by the Free
| Software Foundation; either version 1, or (at your option) any later version.
|
| GNU Smalltalk is distributed in the hope that it will be useful, but WITHOUT
| ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
| FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
| details.
|
| You should have received a copy of the GNU General Public License along with
| GNU Smalltalk; see the file COPYING. If not, write to the Free Software
| Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
======================================================================"
"
| Change Log
| ============================================================================
| Author Date Change
| sbb 16 Mar 91 Class creation now separate statement.
|
| sbb 1 Jan 91 Added print: and store: so that printing and storing
| can be cascaded.
|
| sbyrne 20 May 90 Fixed semantics of write streams so that they return
| only the characters that have been written to them.
|
| sbyrne 19 Sep 89 Changed to use real method categories.
|
| sbyrne 25 Apr 89 created.
|
"
PositionableStream subclass: #WriteStream
instanceVariableNames: 'maxSize'
classVariableNames: ''
poolDictionaries: ''
category: nil
!
WriteStream comment:
'I am the class of writeable streams. I only allow write operations to
my instances; reading is strictly forbidden.' !
!WriteStream class methodsFor: 'instance creation'!
on: aCollection
^(self new initCollection: aCollection) access: 2
!
with: aCollection
| stream |
stream _ self on: aCollection.
stream moveToEnd.
^stream
!
with: aCollection from: firstIndex to: lastIndex
| stream |
stream _ self on: aCollection fromFirstIndex to: lastIndex.
stream moveToEnd.
^stream
!!
!WriteStream methodsFor: 'accessing-writing'!
nextPut: anObject
"(access bitAnd: 2) = 0
ifTrue: [ ^self shouldNotImplement ]."
ptr > maxSize ifTrue: [ self growCollection ].
collection at: ptr put: anObject.
ptr > endPtr ifTrue: [ endPtr _ ptr ].
ptr _ ptr + 1.
^anObject
!!
!WriteStream methodsFor: 'positioning'!
setToEnd
ptr _ endPtr + 1
!!
!WriteStream methodsFor: 'character writing'!
cr
self nextPut: Character cr
!
nl
self nextPut: Character nl
!
crTab
self cr.
self tab
!
nlTab
self nl.
self tab
!
space
self nextPut: Character space
!
tab
self nextPut: Character tab
!!
!WriteStream methodsFor: 'stream printing'!
print: anObject
anObject printOn: self
!
store: anObject
anObject storeOn: self
!!
!WriteStream methodsFor: 'private methods'!
initCollection: aCollection
collection _ aCollection.
ptr _ 1.
endPtr _ 0.
maxSize _ aCollection size
!
moveToEnd
endPtr _ collection size.
self setToEnd
!
workingSize
"Return the actual number of valid elements in the stream"
^ptr max: endPtr
!
growCollection
collection grow.
maxSize _ collection size
!!