[Caml-list] debugging ocamllex/ocamlyacc specifications?

[Will Benton <willb@cs.wisc.edu>]

Hello, all.  I am writing a simple interpreter for fun but am having
trouble with ocamllex and ocamlyacc.  To test my lexer and parser, I am
using the test program from the desk calculator example in the manual, but
I when I type in an expression and press EOL, it does nothing (my "main"
rule in the parser is "exp EOL"); I know it's doing something because
if I type in a garbage expression, it gives me a parse error
exception.  When I type in an expression and press EOF, on the other hand,
it gives me a Failure("lexing: empty token") exception.

If anyone knows what might cause these problems, that would be nice to
know.  Otherwise, if there is some way to put the lexer and parser in a
"verbose debug mode", detailing what tokens are produced and/or what
productions are applied, that would be really helpful.


thanks,
wb

---
Will Benton      | "Nicht wie die Welt ist, ist das Mystische, 
willb@acm.org    |  sondern daß sie ist." --L. Wittgenstein

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