[Pyparsing] boot-strapping grammars?

[Duncan M. <dun...@gm...>]

Hello Paul and all :-)

Has anyone done any work with bootstrapping one grammar with another
using PyParsing?

Here's a concrete example of what I'm hoping to accomplish:

 * I've copied the OpenBSD pf (packet filter) grammar (from its man page)
 * I've adapted Paul's python BNF parser example to parse it (only
partially working so far)
 * Once it's done, I'd like to use it to create a PyParsing grammar
that can parse any legal (according to the BNF) pf commands

Is this even possible?

Or would it be better just to create a PyParsing grammar from scratch
for the 81 identities in the pf BNF...?

Thanks!

d