"
 COPYRIGHT (c) 2004 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:libbasic' }"

PeekableStream subclass:#EncodedStream
	instanceVariableNames:'encoder stream'
	classVariableNames:''
	poolDictionaries:''
	category:'Collections-Text-Encodings'
!

!EncodedStream class methodsFor:'documentation'!

copyright
"
 COPYRIGHT (c) 2004 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.
"
! !

!EncodedStream class methodsFor:'instance creation'!

stream:streamArg encoder:encoder
    ^ (self basicNew) stream:streamArg; encoder:encoder
! !

!EncodedStream class methodsFor:'utilities'!

decodedStreamFor:aStream
    |encoding decoder decodedStream|

    "/ setup for no-encoding; allows for a later switch to a real encoder,
    "/ whenever an encoding pragma is encountered later.
    decoder := CharacterEncoder nullEncoderInstance.

    aStream isPositionable ifTrue:[
        encoding := CharacterEncoder guessEncodingOfStream:aStream.
        (encoding notNil
        and:[ encoding ~= #'iso8859-1' 
        and:[ encoding ~= #'ascii' ]]) ifTrue:[
            decoder := CharacterEncoder encoderFor:encoding.
        ].
    ].
    decodedStream := EncodedStream stream:aStream encoder:decoder.
    decodedStream skipEncodingChunk.
    ^ decodedStream
! !

!EncodedStream methodsFor:'accessing'!

contentsSpecies

    "Not sure if this is ok"

    ^ stream contentsSpecies.

"/    ^UnicodeString

    "Created: / 14-06-2005 / 17:11:01 / janfrog"
!

encoder
    ^ encoder
!

encoder:something
    encoder := something.
!

pathName
    "if our base stream hat a pathname, delegate..."

    stream isNil ifTrue:[
        ^ nil.
    ].
    ^ stream pathName.
!

readStream
    ^ self
!

stream
    ^ stream
!

stream:something
    stream := something.
! !

!EncodedStream methodsFor:'stream protocol'!

atEnd
    ^ stream atEnd
!

close
    stream close
!

cr
    self nextPutAll:(Character cr asString)
!

emphasis:anObject

    stream emphasis:anObject

    "Created: / 15-06-2005 / 11:16:33 / janfrog"
!

isOpen
    ^ stream isOpen
!

next

    ^encoder readNextCharacterFrom:stream

    "Created: / 14-06-2005 / 17:01:39 / janfrog"
!

next:charactersToRead

    ^encoder readNext:charactersToRead charactersFrom:stream

    "Created: / 16-06-2005 / 11:43:43 / masca"
!

nextChunk
    |chunk|

    chunk := stream nextChunk.
    chunk isNil ifTrue:[^ chunk].
    ^ encoder decodeString:chunk
!

nextChunkPut:chunk
    stream nextChunkPut:(encoder encodeString:chunk)
!

nextPut:aCharacter
    self nextPutAll:(aCharacter asString).
!

nextPutAll:aCollection
    stream nextPutAll:(encoder encodeString:aCollection).
!

peek

    ^stream peek

    "Created: / 20-06-2005 / 10:13:03 / masca"
    "Modified: / 20-06-2005 / 13:06:14 / masca"
!

peekFor:aCharacter
    ^ stream peekFor:aCharacter
!

position
    ^ stream position
!

position0Based
    "to be obsoleted - use position"

    ^ stream position0Based
!

position0Based:newPosition
    "to be obsoleted - use position"

    stream position0Based:newPosition
!

position1Based
    "to be obsoleted - use position"

    ^ stream position1Based
!

position1Based:newPosition
    "to be obsoleted - use position"

    stream position1Based:newPosition
!

position:newPosition
    stream position:newPosition
!

setToEnd
    stream setToEnd
!

skip: anInteger

    "/ Should skip on character basis, not on bytes. This works for XML reader
    ^stream skip: anInteger

    "Created: / 20-06-2005 / 13:06:06 / masca"
!

skipSeparators
    ^ stream skipSeparators
! !

!EncodedStream methodsFor:'utilities'!

skipEncodingChunk
    |pos chunk tree|

    pos := self position.
    chunk := self nextChunk.
    tree := (Parser parseExpression:chunk).
    "/ if this is a valid chunk (i.e. not a comment or encoding-directive),
    "/ then position back, so it will be processed as usual.
    tree notNil ifTrue:[
        self position:pos
    ]
! !

!EncodedStream class methodsFor:'documentation'!

version
    ^ '$Header: /cvs/stx/stx/libbasic/EncodedStream.st,v 1.17 2010-01-18 13:55:20 stefan Exp $'
!

version_CVS
    ^ '$Header: /cvs/stx/stx/libbasic/EncodedStream.st,v 1.17 2010-01-18 13:55:20 stefan Exp $'
! !