[TransWarp] fmtparse - recursive grammar

[Oleg Broytmann]

Hello!

   Can I parse a recursive grammar using fmtparse?

   For example, I want to parse queries like this:
and(1, or(xxx, yyy))
or(month, and(ttt, uuu))
   and so on. EBNF grammar is something like

query -> and_or(query, ...)
and_or -> and | or

   (without all annoying details).

   Now I am trying to write a parser:

from peak.util.fmtparse import *

and_or = Alternatives("and", "or")
query = Sequence(and_or, '(', query, ')')

   Oops, query referenced before assignment...

Oleg.
-- 
     Oleg Broytmann            http://phd.pp.ru/            phd at phd.pp.ru
           Programmers don't die, they just GOSUB without RETURN.