[Pyparsing] setResultsName on a recursive element of grammar

[Elizabeth M. <eli...@in...>]

Hello,

So I am trying to create a recursive grammar that specifies
RFC1459-style IRC frames for a pet project. This is what I have so far:

---SNIP---
> command = Word(alphanums).setResultsName("command")
> middle = Word(alphanums)  # Middle parameter
> end = Literal(":").suppress()  # Last optional parameter
> param = Forward()
> param << Optional((middle + param) | end)
> param = param.setResultsName("param", listAllMatches=True)
>
> line = command + param + stringEnd()

Unfortunately, the result I get out of it is this:

> l = line.parseString("COMMAND param1 param2 :param3")
> print(l.param)
>> ['param1']

It "works" when I do:

> param = Group(param).setResultsName("param", listAllMatches=True)

But then it nests everything:

>> [['param1', 'param2', 'param last']]

I'm not entirely sure what to do here, or if this is a bug? (or a bug in
my grammar?)

--
Elizabeth