Robby...k My "<*>" chunk was called "*" (my mistake) and the e.g. I posted was typed straight into the mail, and not properly tested.
Thanks for taking the time to respond, despite this accumulated muppetry. Regards, Tim On 20/05/11 13:22, Robby Findler wrote:
That should work. When I require that file I get this: compile: unbound identifier in module in: define-empty-tokens and then when I fix it like this: @chunk[<*> (require parser-tools/lex) (define-empty-tokens mt-token-group (<empty-tokens>))] things seem to work fine. Robby On Fri, May 20, 2011 at 6:45 AM, Tim Brown<[email protected]> wrote:Hello, I'm writing a literate program which includes a lexer/parser. I am trying to build up the lexer a token at a time... --------- #lang scribble/lp @section{newlines} A newline is at the end of a line... in fact we'll consume all newlines, since we don't care how many there are. @chunk[<empty-tokens> new-line] @chunk[<lex-rules> ((:+ (:or #\newline #\return)) (token-new-line))] @section{End of file} The parser would like to know when I've run out of file... @chunk[<empty-tokens> end-of-file] @chunk[<lex-rules> ((eof) (token-end-of-file))] @chunk[<*> (define-empty-tokens mt-token-group (<empty-tokens>)) ] ------------- Upon requiring this module; I get: "lex-lp.rkt:5:22: compile: unbound identifier in module in: new-line" Should I be able to do this? Should the LP code replace<*> with: (define-empty-tokens mt-token-group (new-line end-of-file)) and then evaluate it? Or am I doing something horribly wrong (again). Regards, Tim
-- Tim Brown <[email protected]> | City Computing Limited | T: +44 20 8770 2110 | City House, Sutton Park Road | F: +44 20 8770 2130 | Sutton, Surrey, SM1 2AE, GB | -----------------------------------------------------------------------| BEAUTY: What's in your eye when you have a bee in your hand | -----------------------------------------------------------------------' City Computing Limited registered in London No. 1767817. Registered Office: City House, Sutton Park Road, Sutton, Surrey, SM1 2AE VAT number 372 8290 34. _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
