Current File : //data/old/usr/lib/python3.4/site-packages/urlwatch/util.py
# -*- coding: utf-8 -*-
#
# This file is part of urlwatch (https://thp.io/2008/urlwatch/).
# Copyright (c) 2008-2016 Thomas Perl <thp.io/about>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import logging
logger = logging.getLogger(__name__)
class TrackSubClasses(type):
"""A metaclass that stores subclass name-to-class mappings in the base class"""
def __init__(cls, name, bases, namespace):
for base in bases:
if base == object:
continue
for attr in ('__required__', '__optional__'):
if not hasattr(base, attr):
continue
inherited = getattr(base, attr, ())
new_value = tuple(namespace.get(attr, ())) + tuple(inherited)
namespace[attr] = new_value
setattr(cls, attr, new_value)
for base in bases:
if base == object:
continue
if hasattr(cls, '__kind__'):
subclasses = getattr(base, '__subclasses__', None)
if subclasses is not None:
logger.info('Registering %r as %s', cls, cls.__kind__)
subclasses[cls.__kind__] = cls
break
else:
anonymous_subclasses = getattr(base, '__anonymous_subclasses__', None)
if anonymous_subclasses is not None:
logger.info('Registering %r', cls)
anonymous_subclasses.append(cls)
break
super().__init__(name, bases, namespace)
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