factor/library/platform/native/unparser.factor

!:folding=indent:collapseFolds=1:

! $Id$
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! Copyright (C) 2004 Slava Pestov.
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IN: unparser
USE: arithmetic
USE: combinators
USE: kernel
USE: lists
USE: logic
USE: namespaces
USE: parser
USE: stack
USE: stdio
USE: strings
USE: words
USE: vocabularies

: fixnum% ( num -- )
    base /mod swap dup 0 > [ fixnum% ] [ drop ] ifte >digit % ;

: fixnum- ( num -- num )
    dup 0 < [ "-" % neg ] when ;

: fixnum>str ( num -- str )
    <% fixnum- fixnum% %> ;

: unparse-str ( str -- str )
    #! Not done
    <% #\" % % #\" % %> ;

: unparse-word ( word -- str )
    word-name dup "#<unnamed>" ? ;

: unparse ( obj -- str )
    [
        [ t eq?   ] [ drop "t" ]
        [ f eq?   ] [ drop "f" ]
        [ word?   ] [ unparse-word ]
        [ fixnum? ] [ fixnum>str ]
        [ string? ] [ unparse-str ]
        [ drop t  ] [ drop "#<unknown>" ]
    ] cond ;

: . ( expr -- )
    unparse print ;

: [.] ( list -- )
    #! Unparse each element on its own line.
    [ . ] each ;