"""|NumberingPart| and closely related objects."""

from ..opc.part import XmlPart

from ..shared import lazyproperty

class NumberingPart(XmlPart):

"""Proxy for the numbering.xml part containing numbering definitions for a document

or glossary."""

@classmethod

def new(cls) -> "NumberingPart":

"""Newly created numbering part, containing only the root ``<w:numbering>`` element."""

raise NotImplementedError

@lazyproperty

def numbering_definitions(self):

"""The |_NumberingDefinitions| instance containing the numbering definitions

(<w:num> element proxies) for this numbering part."""

return _NumberingDefinitions(self._element)

class _NumberingDefinitions:

"""Collection of |_NumberingDefinition| instances corresponding to the ``<w:num>``

elements in a numbering part."""

def __init__(self, numbering_elm):

super(_NumberingDefinitions, self).__init__()

self._numbering = numbering_elm

def __len__(self):

return len(self._numbering.num_lst)