[spambayes-dev] Use of email factory function

[Sjoerd Mullender]

While looking through the code in sb_imapfilter.py I noticed this 
comment with the associated code:

         # Annoyingly, we can't just pass over the RFC822 message to an
         # existing message object (like self) and have it parse it. So
         # we go through the hoops of creating a new message, and then
         # copying over all its internals.
         try:
             new_msg = email.Parser.Parser().parsestr(data[self.rfc822_key])
	[...]

I was wondering, instead of having the email parser create a new 
instance and then copying over the internals, could we not make use of 
the factory function argument?

We could call the parser like this:

new_msg = email.Parser.Parser(lambda x=self: 
x).parsestr(data[self.rfc822_key])

The parser will call the factory function passed as its first argument 
to get a new instance of a Message.  But we could also just use a 
factory function that returns the already existing instance (lambda 
x=self: x) and then not copy over the internals.

Or is this something that doesn't work in older but still supported 
versions of the email package?

-- 
Sjoerd Mullender <sjoerd at acm.org>
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