Slava,

This is from listener.factor :

: parse-interactive-step ( lines -- quot/f )
    [ parse-lines ] catch {
        { [ dup [ unexpected-eof? ] is? ] [ 2drop f ] }
        { [ dup not ] [ drop ] }
        { [ t ] [ rethrow ] }
    } cond ;

Since it calls parse-lines, it's hardcoded to use the default lexer and I 
don't have a chance to override which lexer it uses. What do you think about 
having the listener's lexer be replaceable? Something like this:

VAR: listener-lexer

[ <lexer> ] >listener-lexer

: listener-parse-lines ( lines -- quot ) listener-lexer> call (parse-lines) ;

: parse-interactive-step ( lines -- quot/f )
    [ listener-parse-lines ] catch {
        { [ dup [ unexpected-eof? ] is? ] [ 2drop f ] }
        { [ dup not ] [ drop ] }
        { [ t ] [ rethrow ] }
    } cond ;

So that I can supply a lexer that works with sexps:

        [ <sexp-lexer> ] >listener-lexer

Ed

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