_header_value_parser.py 文件源码

def get_dot_atom(value):
    """ dot-atom = [CFWS] dot-atom-text [CFWS]

    Any place we can have a dot atom, we could instead have an rfc2047 encoded
    word.
    """
    dot_atom = DotAtom()
    if value[0] in CFWS_LEADER:
        token, value = get_cfws(value)
        dot_atom.append(token)
    if value.startswith('=?'):
        try:
            token, value = get_encoded_word(value)
        except errors.HeaderParseError:
            # XXX: need to figure out how to register defects when
            # appropriate here.
            token, value = get_dot_atom_text(value)
    else:
        token, value = get_dot_atom_text(value)
    dot_atom.append(token)
    if value and value[0] in CFWS_LEADER:
        token, value = get_cfws(value)
        dot_atom.append(token)
    return dot_atom, value