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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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