Hello!
I am guilty of any omissions in the NIST-SIP parser. If you find that there
are cases that are not correctly handled, I urge you to bring it to our
attention (via the [EMAIL PROTECTED] mailing list).
As written in the RFC, the grammar is not context free. Perhaps it can be
converted to be context free by handling keywords in the "action" part of a
rule. As written in the RFC, keywords are context sensitive. That is why the
NIST-SIP parser keeps switching lexical analyzers.
Clearly the NIST-SIP parser is an existence proof of the correctness your
assessment (I exist, therefore I am).
Thanks for using it and I hope you will report bugs.
Regards,
Ranga.
--
M. Ranganathan
National Institute of Standards and Technology
Advanced Networking Technologies Division
100 Bureau Drive, Stop 8920,
Gaithersburg, MD 20899, U.S.A.
Tel:(301)975-3664 Fax:(301)590-0932
Advanced Networking Technologies For the People!
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Ganesh
Jayadevan
Sent: Sunday, July 15, 2001 12:10 AM
To: [EMAIL PROTECTED]
Subject: [Sip-implementors] question about SIP grammar
All,
>From what I understand, the SIP grammar is pretty
much a context-free grammar and can be captured in
lex/yacc or antlr. The NIST SIP parser in java uses
antlr.
Or does the NIST parser leave something out? Have you
had any experience with the NIST SIP parser?
I am new to SIP but having looked at the grammar very
briefly, my esitmation is that one can use a parser
generator and not have to 'hand-write' the code to do
the parsing.
Am I correct in my assesment?
Regards,
Ganesh
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