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__all__ = [
    'body_line_iterator',
    'typed_subpart_iterator',
    'walk',
    # Do not include _structure() since it's part of the debugging API.
    ]

import sys
from cStringIO 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():
            for subsubpart in subpart.walk():
                yield subsubpart

# 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, basestring):
            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_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 >> fp, tab + msg.get_content_type(),
    if include_default:
        print >> fp, '[%s]' % msg.get_default_type()
    else:
        print >> fp
    if msg.is_multipart():
        for subpart in msg.get_payload():
            _structure(subpart, fp, level+1, include_default)