I've ended up with this concoction:
class PLYParser(object):
def _create_opt_rule(self, rulename):
""" Given a rule name, creates an optional ply.yacc rule
for it. The name of the optional rule is
<rulename>_opt
"""
optname = rulename + '_opt'
def optrule(self, p):
p[0] = p[1]
optrule.__doc__ = '%s : empty\n| %s' % (optname, rulename)
optrule.__name__ = 'p_%s' % optname
setattr(self.__class__, optrule.__name__, optrule)
if __name__ == '__main__':
pp = PLYParser()
pp._create_opt_rule('java')
ar = [4, 6]
pp.p_java_opt(ar)
print ar
print pp.p_java_opt.__doc__
print dir(pp)
---------------------
._create_opt_rule creates a ply.yacc valid rule, with a correct
docstring.
Tried it in my parsing code (using PLY 2.5) - it works, and saves
quite a bit of boilerplate code. So I'm putting it here in the hope
that it will be useful.
Dave - adding rule? and rule* to PLY would still be much cooler :-)
Eli
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