mirror of
https://github.com/python/cpython.git
synced 2024-11-27 20:04:41 +08:00
69 lines
2.1 KiB
Python
69 lines
2.1 KiB
Python
# Copyright (C) 2001-2006 Python Software Foundation
|
|
# Author: Barry Warsaw
|
|
# Contact: email-sig@python.org
|
|
|
|
"""Various types of useful iterators and generators."""
|
|
|
|
__all__ = [
|
|
'body_line_iterator',
|
|
'typed_subpart_iterator',
|
|
'walk',
|
|
# Do not include _structure() since it's part of the debugging API.
|
|
]
|
|
|
|
import sys
|
|
from io import StringIO
|
|
|
|
|
|
# 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():
|
|
yield from subpart.walk()
|
|
|
|
|
|
# These two functions are imported into the Iterators.py interface module.
|
|
def body_line_iterator(msg, decode=False):
|
|
"""Iterate over the parts, returning string payloads line-by-line.
|
|
|
|
Optional decode (default False) is passed through to .get_payload().
|
|
"""
|
|
for subpart in msg.walk():
|
|
payload = subpart.get_payload(decode=decode)
|
|
if isinstance(payload, str):
|
|
yield from StringIO(payload)
|
|
|
|
|
|
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_content_maintype() == maintype:
|
|
if subtype is None or subpart.get_content_subtype() == subtype:
|
|
yield subpart
|
|
|
|
|
|
def _structure(msg, fp=None, level=0, include_default=False):
|
|
"""A handy debugging aid"""
|
|
if fp is None:
|
|
fp = sys.stdout
|
|
tab = ' ' * (level * 4)
|
|
print(tab + msg.get_content_type(), end='', file=fp)
|
|
if include_default:
|
|
print(' [%s]' % msg.get_default_type(), file=fp)
|
|
else:
|
|
print(file=fp)
|
|
if msg.is_multipart():
|
|
for subpart in msg.get_payload():
|
|
_structure(subpart, fp, level+1, include_default)
|