[racket] parser-tools help

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Hi Timothy,

On 30-11-11 15:14, Timothy Nelson wrote:
> Hi Marijn,
> 
> Two quick points:
> 
> (1) The parser works with token structs, not symbols. Whenever you
> declare a token, a cooresponding "token-<name>" form is made
> available to you when using lexer.

Actually the parser will accept symbols instead of tokens, but you
won't be able to store any data IN the token/symbol.

> (2) Parsers expect a nullary function that invokes the lexer on a
> port, so you need a small modification:
> 
> (define (main port) (write (turn0-parser (lambda () (turn0-lexer
> port)))))
> 
> If you instead write
> 
> (define (main port) (write (turn0-parser (turn0-lexer port))))
> 
> the parser is passed the first token itself, not a thunk it can
> call to get successive tokens, which is what it wants.

Thanks, that was real useful!

After fixing this I was able to figure out the rest of the problems.

Marijn
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