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stringregexhandler.py
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119 lines (99 loc) · 5.13 KB
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#!/usr/bin/env python
#
# A library that provides a Python interface to the Telegram Bot API
# Copyright (C) 2015-2017
# Leandro Toledo de Souza <devs@python-telegram-bot.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 Public License for more details.
#
# You should have received a copy of the GNU Lesser Public License
# along with this program. If not, see [http://www.gnu.org/licenses/].
""" This module contains the StringRegexHandler class """
import re
from future.utils import string_types
from .handler import Handler
class StringRegexHandler(Handler):
"""
Handler class to handle string updates based on a regex. It uses a
regular expression to check update content. Read the documentation of the
``re`` module for more information. The ``re.match`` function is used to
determine if an update should be handled by this handler.
Note:
This handler is not used to handle Telegram :attr:`telegram.Update`, but strings manually
put in the queue. For example to send messages with the bot using command line or API.
Attributes:
pattern (:obj:`str` | :obj:`Pattern`): The regex pattern.
callback (:obj:`callable`): The callback function for this handler.
pass_groups (:obj:`bool`): Optional. Determines whether ``groups`` will be passed to the
callback function.
pass_groupdict (:obj:`bool`): Optional. Determines whether ``groupdict``. will be passed to
the callback function.
pass_update_queue (:obj:`bool`): Optional. Determines whether ``update_queue`` will be
passed to the callback function.
pass_job_queue (:obj:`bool`): Optional. Determines whether ``job_queue`` will be passed to
the callback function.
Args:
pattern (:obj:`str` | :obj:`Pattern`): The regex pattern.
callback (:obj:`callable`): A function that takes ``bot, update`` as positional arguments.
It will be called when the :attr:`check_update` has determined that an update should be
processed by this handler.
pass_groups (:obj:`bool`, optional): If the callback should be passed the result of
``re.match(pattern, data).groups()`` as a keyword argument called ``groups``.
Default is ``False``
pass_groupdict (:obj:`bool`, optional): If the callback should be passed the result of
``re.match(pattern, data).groupdict()`` as a keyword argument called ``groupdict``.
Default is ``False``
pass_update_queue (:obj:`bool`, optional): If set to ``True``, a keyword argument called
``update_queue`` will be passed to the callback function. It will be the ``Queue``
instance used by the :class:`telegram.ext.Updater` and :class:`telegram.ext.Dispatcher`
that contains new updates which can be used to insert updates. Default is ``False``.
pass_job_queue (:obj:`bool`, optional): If set to ``True``, a keyword argument called
``job_queue`` will be passed to the callback function. It will be a
:class:`telegram.ext.JobQueue` instance created by the :class:`telegram.ext.Updater`
which can be used to schedule new jobs. Default is ``False``.
"""
def __init__(self,
pattern,
callback,
pass_groups=False,
pass_groupdict=False,
pass_update_queue=False,
pass_job_queue=False):
super(StringRegexHandler, self).__init__(
callback, pass_update_queue=pass_update_queue, pass_job_queue=pass_job_queue)
if isinstance(pattern, string_types):
pattern = re.compile(pattern)
self.pattern = pattern
self.pass_groups = pass_groups
self.pass_groupdict = pass_groupdict
def check_update(self, update):
"""
Determines whether an update should be passed to this handlers :attr:`callback`.
Args:
update (:obj:`str`): An incomming command.
Returns:
:obj:`bool`
"""
return isinstance(update, string_types) and bool(re.match(self.pattern, update))
def handle_update(self, update, dispatcher):
"""
Send the update to the :attr:`callback`.
Args:
update (:obj:`str`): An incomming command.
dispatcher (:class:`telegram.ext.Dispatcher`): Dispatcher that originated the command.
"""
optional_args = self.collect_optional_args(dispatcher)
match = re.match(self.pattern, update)
if self.pass_groups:
optional_args['groups'] = match.groups()
if self.pass_groupdict:
optional_args['groupdict'] = match.groupdict()
return self.callback(dispatcher.bot, update, **optional_args)