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114 lines
4.3 KiB
Python
114 lines
4.3 KiB
Python
#!/usr/bin/env python
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#
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# A library that provides a Python interface to the Telegram Bot API
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# Copyright (C) 2015-2022
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# Leandro Toledo de Souza <devs@python-telegram-bot.org>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser Public License for more details.
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#
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# You should have received a copy of the GNU Lesser Public License
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# along with this program. If not, see [http://www.gnu.org/licenses/].
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"""This module contains the StringRegexHandler class."""
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import re
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from typing import TYPE_CHECKING, Match, Optional, Pattern, TypeVar, Union
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from telegram._utils.defaultvalue import DEFAULT_TRUE
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from telegram._utils.types import DVInput
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from telegram.ext._handler import BaseHandler
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from telegram.ext._utils.types import CCT, HandlerCallback
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if TYPE_CHECKING:
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from telegram.ext import Application
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RT = TypeVar("RT")
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class StringRegexHandler(BaseHandler[str, CCT]):
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"""BaseHandler class to handle string updates based on a regex which checks the update content.
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Read the documentation of the :mod:`re` module for more information. The :func:`re.match`
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function is used to determine if an update should be handled by this handler.
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Note:
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This handler is not used to handle Telegram :class:`telegram.Update`, but strings manually
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put in the queue. For example to send messages with the bot using command line or API.
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Warning:
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When setting :paramref:`block` to :obj:`False`, you cannot rely on adding custom
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attributes to :class:`telegram.ext.CallbackContext`. See its docs for more info.
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Args:
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pattern (:obj:`str` | :func:`re.Pattern <re.compile>`): The regex pattern.
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callback (:term:`coroutine function`): The callback function for this handler. Will be
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called when :meth:`check_update` has determined that an update should be processed by
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this handler. Callback signature::
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async def callback(update: Update, context: CallbackContext)
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The return value of the callback is usually ignored except for the special case of
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:class:`telegram.ext.ConversationHandler`.
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block (:obj:`bool`, optional): Determines whether the return value of the callback should
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be awaited before processing the next handler in
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:meth:`telegram.ext.Application.process_update`. Defaults to :obj:`True`.
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Attributes:
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pattern (:obj:`str` | :func:`re.Pattern <re.compile>`): The regex pattern.
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callback (:term:`coroutine function`): The callback function for this handler.
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block (:obj:`bool`): Determines whether the return value of the callback should be
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awaited before processing the next handler in
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:meth:`telegram.ext.Application.process_update`.
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"""
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__slots__ = ("pattern",)
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def __init__(
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self,
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pattern: Union[str, Pattern],
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callback: HandlerCallback[str, CCT, RT],
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block: DVInput[bool] = DEFAULT_TRUE,
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):
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super().__init__(callback, block=block)
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if isinstance(pattern, str):
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pattern = re.compile(pattern)
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self.pattern = pattern
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def check_update(self, update: object) -> Optional[Match]:
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"""Determines whether an update should be passed to this handler's :attr:`callback`.
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Args:
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update (:obj:`object`): The incoming update.
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Returns:
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:obj:`None` | :obj:`re.match`
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"""
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if isinstance(update, str):
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match = re.match(self.pattern, update)
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if match:
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return match
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return None
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def collect_additional_context(
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self,
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context: CCT,
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update: str,
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application: "Application",
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check_result: Optional[Match],
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) -> None:
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"""Add the result of ``re.match(pattern, update)`` to :attr:`CallbackContext.matches` as
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list with one element.
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"""
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if self.pattern and check_result:
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context.matches = [check_result]
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