Is there a library to parse Mozilla "mork" documents?

[John Reese]

Mozilla, Firefox, Thunderbird, and so forth use this awful format
called MORK to store all kinds of things: which messages you've read
in a newsgroup, headers and indexes into the mbox file of messages in
a mail folder, and address books.  It's documented to some extent
here:
http://www.mozilla.org/mailnews/arch/mork/primer.txt

Does anyone know of a Python library for parsing these files?  A
single file basically just stores the equivalent of a nested
dictionary with text that can be declared separately and interpolated.
jwz has an over-specific perl version at
http://www.jwz.org/hacks/marginal.html, which I might have to try to
translate if there's nothing already available in Python.