English version
Accueil     À propos     Téléchargement     Ressources     Contactez-nous    

Ce site est rarement mis à jour. Pour les informations les plus récentes, rendez-vous sur le nouveau site OCaml à l'adresse ocaml.org.

Browse thread
[Caml-list] debugging ocamllex/ocamlyacc specifications?
[ Home ] [ Index: by date | by threads ]
[ Search: ]

[ Message by date: previous | next ] [ Message in thread: previous | next ] [ Thread: previous | next ]
Date: 2001-12-28 (06:40)
From: Will Benton <willb@c...>
Subject: [Caml-list] debugging ocamllex/ocamlyacc specifications?
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.


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

Bug reports: http://caml.inria.fr/bin/caml-bugs  FAQ: http://caml.inria.fr/FAQ/
To unsubscribe, mail caml-list-request@inria.fr  Archives: http://caml.inria.fr