Also try: http://www.codaset.com/pmatos/eboc/source/master/blob/eventb-parser.rkt
It's a parser for the formal language Event-B. Cheers, PMatos Eduardo Bellani <ebell...@gmail.com> writes: > I've just completed a small example for a logo like language using the > parser tools. Take a look at files mech.rkt and test-mech.rkt here: > http://github.com/ebellani/robo > > If you have any doubts just ask. > > On 10/12/2010 03:12 PM, Mark Carter wrote: >> Are there any examples on using lex and yacc, as I'm having trouble getting >> started. I am trying to write a simple calculator. Here's what I've got so >> far: >> >> #lang racket/base >> >> (require parser-tools/lex) >> >> (define lex (lexer >> ((:+ "[0-9]") (values 'int (string->number lexeme))) >> ((:+ whitespace) null) >> ((:: "+") (values 'plus 0)) >> ((:: "-") (values 'minus 0)) >> ((:: "*") (values 'mult 0)) >> ((:: "/") (values 'div 0)))) >> >> When I try to compile it, I get >> regular-expression: undefined operator in: (:+ "[0-9]") >> How do I correct this? >> >> >> >> >> _________________________________________________ >> For list-related administrative tasks: >> http://lists.racket-lang.org/listinfo/users -- PMatos _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users