"
 COPYRIGHT (c) 1996 by eXept Software AG
	      All Rights Reserved

 This software is furnished under a license and may be used
 only in accordance with the terms of that license and with the
 inclusion of the above copyright notice.   This software may not
 be provided or otherwise made available to, or used by, any
 other person.  No title to or ownership of the software is
 hereby transferred.
"



"{ Package: 'stx:goodies' }"

FilteringStream subclass:#LineNumberReadStream
	instanceVariableNames:'lineNumber'
	classVariableNames:''
	poolDictionaries:''
	category:'Streams-Misc'
!

!LineNumberReadStream class methodsFor:'documentation'!

copyright
"
 COPYRIGHT (c) 1996 by eXept Software AG
	      All Rights Reserved

 This software is furnished under a license and may be used
 only in accordance with the terms of that license and with the
 inclusion of the above copyright notice.   This software may not
 be provided or otherwise made available to, or used by, any
 other person.  No title to or ownership of the software is
 hereby transferred.
"


!

documentation
"
    This filter keeps track of the current line, while
    passing text from its inputStream to its outputStream.

    Can be placed in-between text processing and the texts
    input stream, and let it keep track of the lineNumber.

    [see also:]
	ReadStream WriteStream ExternalStream FileStream
	FilteringStream FilteringLineStream

    [author:]
	Claus Gittinger
"
!

examples
"
  count lines in a Makefile:
									[exBegin]
    |in filter|

    in := 'Makefile' asFilename readStream.

    filter := LineNumberReadStream readingFrom:in.

    filter upToEnd.
    filter close.

    Transcript showCR:('Makefile has %1 lines' bindWith:(filter lineNumber - 1)).
									[exEnd]



  find a specific string and output its lineNr:
									[exBegin]
    |in filter|

    in := 'Makefile' asFilename readStream.

    filter := LineNumberReadStream readingFrom:in.

    filter skipThroughAll:'start of'.
    filter close.

    Transcript showCR:('found in line %1' bindWith:(filter lineNumber)).
									[exEnd]
"


! !

!LineNumberReadStream methodsFor:'accessing'!

lineNumber
    "return the current lineNumber"

    ^ lineNumber

    "Created: 11.1.1997 / 16:57:10 / cg"
    "Modified: 11.1.1997 / 16:57:19 / cg"
!

lineNumber:something
    "set the current lineNumber"

    lineNumber := something.

    "Created: 11.1.1997 / 16:57:10 / cg"
    "Modified: 11.1.1997 / 16:57:22 / cg"
! !

!LineNumberReadStream methodsFor:'initialization'!

initialize
    super initialize.

    lineNumber := 1.
    filter := [:char |

		char == Character cr ifTrue:[
		    lineNumber := lineNumber + 1.
		].
		char
	      ].

    "Modified: 11.1.1997 / 16:58:42 / cg"
! !

!LineNumberReadStream class methodsFor:'documentation'!

version
    ^ '$Header: /cvs/stx/stx/libbasic2/LineNumberReadStream.st,v 1.3 2003-06-09 16:20:24 cg Exp $'
! !