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# Copyright (C) 2002 Python Software Foundation
# Author: barry@zope.com
"""Module containing compatibility functions for Python 2.1.
"""
from __future__ import generators
from __future__ import division
from cStringIO import StringIO
from types import StringTypes
# This function will become a method of the Message class
def walk(self):
"""Walk over the message tree, yielding each subpart.
The walk is performed in depth-first order. This method is a
generator.
"""
yield self
if self.is_multipart():
for subpart in self.get_payload():
for subsubpart in subpart.walk():
yield subsubpart
# Used internally by the Header class
def _intdiv2(i):
"""Do an integer divide by 2."""
return i // 2
# These two functions are imported into the Iterators.py interface module.
# The Python 2.2 version uses generators for efficiency.
def body_line_iterator(msg):
"""Iterate over the parts, returning string payloads line-by-line."""
for subpart in msg.walk():
payload = subpart.get_payload()
if isinstance(payload, StringTypes):
for line in StringIO(payload):
yield line
def typed_subpart_iterator(msg, maintype='text', subtype=None):
"""Iterate over the subparts with a given MIME type.
Use `maintype' as the main MIME type to match against; this defaults to
"text". Optional `subtype' is the MIME subtype to match against; if
omitted, only the main type is matched.
"""
for subpart in msg.walk():
if subpart.get_main_type('text') == maintype:
if subtype is None or subpart.get_subtype('plain') == subtype:
yield subpart
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