"
 COPYRIGHT (c) 2006 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' }"

Object subclass:#ReadEvalPrintLoop
	instanceVariableNames:'inputStream outputStream errorStream compiler prompt chunkFormat'
	classVariableNames:''
	poolDictionaries:''
	category:'* uncategorized *'
!

!ReadEvalPrintLoop class methodsFor:'documentation'!

copyright
"
 COPYRIGHT (c) 2006 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.
"
! !

!ReadEvalPrintLoop methodsFor:'accessing'!

chunkFormat:something
    chunkFormat := something.
!

compiler:something
    compiler := something.
!

error:something
    errorStream := something.

    "Created: / 07-12-2006 / 17:33:39 / cg"
!

input:something
    inputStream := something.

    "Modified: / 07-12-2006 / 17:33:31 / cg"
!

output:something
    outputStream := something.

    "Created: / 07-12-2006 / 17:27:48 / cg"
!

prompt:something
    prompt := something.
! !

!ReadEvalPrintLoop methodsFor:'evaluation'!

readEvalPrintLoop
    "{ Pragma: +optSpace }"

    "simple read-eval-print loop for non-graphical Minitalk.
     If the chunkFormat-argument is true, chunks are read.
     Otherwise, lines up to an empty line (or EOF) are read."

    [
        |input output error lines chunk|

        input := inputStream ? Stdin.
        output := outputStream ? Stdout.
        error := errorStream ? Stderr.

        prompt notNil ifTrue:[
            output nextPutAll:prompt.
        ].

        input atEnd ifTrue:[
            ^ self.
        ].

        (chunkFormat ? true) ifTrue:[
            input skipSeparators.
            chunk := input nextChunk.
        ] ifFalse:[
            lines := OrderedCollection new.
            [
                |line|

                line := input nextLine.
                line notEmptyOrNil ifTrue:[
                    (line startsWith:'#') ifFalse:[
                        lines add:line.
                    ]
                ].
                line notEmptyOrNil.
            ] whileTrue.
            chunk := lines asStringWith:Character cr.
        ].

        chunk notEmptyOrNil ifTrue:[
            AbortAllOperationRequest handle:[:ex |
                error nextPutLine:('Evaluation aborted: ', ex description)
            ] do:[
                |value|

                value := (compiler new requestor:self) evaluate:chunk.
                value printOn:output
            ].
        ].
    ] loop.

    "Created: / 07-12-2006 / 17:27:21 / cg"
! !

!ReadEvalPrintLoop class methodsFor:'documentation'!

version
    ^ '$Header: /cvs/stx/stx/libbasic/ReadEvalPrintLoop.st,v 1.2 2006-12-07 16:52:33 cg Exp $'
! !