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# Copyright (C) 2001-2006 Python Software Foundation
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# Author: Barry Warsaw
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# Contact: email-sig@python.org
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"""Various types of useful iterators and generators."""
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__all__ = [
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'body_line_iterator',
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'typed_subpart_iterator',
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'walk',
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# Do not include _structure() since it's part of the debugging API.
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]
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import sys
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from io import StringIO
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# This function will become a method of the Message class
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def walk(self):
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"""Walk over the message tree, yielding each subpart.
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The walk is performed in depth-first order. This method is a
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generator.
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"""
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yield self
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if self.is_multipart():
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for subpart in self.get_payload():
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yield from subpart.walk()
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# These two functions are imported into the Iterators.py interface module.
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def body_line_iterator(msg, decode=False):
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"""Iterate over the parts, returning string payloads line-by-line.
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Optional decode (default False) is passed through to .get_payload().
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"""
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for subpart in msg.walk():
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payload = subpart.get_payload(decode=decode)
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if isinstance(payload, str):
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yield from StringIO(payload)
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def typed_subpart_iterator(msg, maintype='text', subtype=None):
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"""Iterate over the subparts with a given MIME type.
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Use `maintype' as the main MIME type to match against; this defaults to
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"text". Optional `subtype' is the MIME subtype to match against; if
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omitted, only the main type is matched.
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"""
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for subpart in msg.walk():
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if subpart.get_content_maintype() == maintype:
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if subtype is None or subpart.get_content_subtype() == subtype:
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yield subpart
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def _structure(msg, fp=None, level=0, include_default=False):
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"""A handy debugging aid"""
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if fp is None:
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fp = sys.stdout
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tab = ' ' * (level * 4)
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print(tab + msg.get_content_type(), end='', file=fp)
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if include_default:
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print(' [%s]' % msg.get_default_type(), file=fp)
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else:
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print(file=fp)
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if msg.is_multipart():
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for subpart in msg.get_payload():
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_structure(subpart, fp, level+1, include_default)
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