# Pyrogram - Telegram MTProto API Client Library for Python

# Copyright (C) 2017-2019 Dan Tès <https://github.com/delivrance>

#

# This file is part of Pyrogram.

#

# Pyrogram is free software: you can redistribute it and/or modify

# it under the terms of the GNU Lesser General Public License as published

# by the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

#

# Pyrogram is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

# GNU Lesser General Public License for more details.

#

# You should have received a copy of the GNU Lesser General Public License

# along with Pyrogram. If not, see <http://www.gnu.org/licenses/>.

class Filter:

def __call__(self, message):

raise NotImplementedError

def __invert__(self):

return InvertFilter(self)

def __and__(self, other):

return AndFilter(self, other)

def __or__(self, other):

return OrFilter(self, other)

class InvertFilter(Filter):

def __init__(self, base):

self.base = base

def __call__(self, message):

return not self.base(message)

class AndFilter(Filter):

def __init__(self, base, other):

self.base = base

self.other = other

def __call__(self, message):

return self.base(message) and self.other(message)

class OrFilter(Filter):

def __init__(self, base, other):

self.base = base

self.other = other

def __call__(self, message):

return self.base(message) or self.other(message)