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#
# A library that provides a Python interface to the Telegram Bot API
# Copyright (C) 2015-2025
# 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/].
import datetime as dtm
from enum import Enum
from docutils.nodes import Element
from sphinx.domains.python import PyXRefRole
from sphinx.environment import BuildEnvironment
from sphinx.util import logging
import telegram
# get the sphinx(!) logger
# Makes sure logs render in red and also plays nicely with e.g. the `nitpicky` option.
sphinx_logger = logging.getLogger(__name__)
CONSTANTS_ROLE = "tg-const"
class TGConstXRefRole(PyXRefRole):
"""This is a bit of Sphinx magic. We add a new role type called tg-const that allows us to
reference values from the `telegram.constants.module` while using the actual value as title
of the link.
Example:
:tg-const:`telegram.constants.MessageLimit.MAX_TEXT_LENGTH` renders as `4096` but links to
the constant.
"""
def process_link(
self,
env: BuildEnvironment,
refnode: Element,
has_explicit_title: bool,
title: str,
target: str,
) -> tuple[str, str]:
title, target = super().process_link(env, refnode, has_explicit_title, title, target)
try:
# We use `eval` to get the value of the expression. Maybe there are better ways to
# do this via importlib or so, but it does the job for now
value = eval(target)
# Maybe we need a better check if the target is actually from tg.constants
# for now checking if it's an Enum suffices since those are used nowhere else in PTB
if isinstance(value, Enum):
# Special casing for file size limits
if isinstance(value, telegram.constants.FileSizeLimit):
return f"{int(value.value / 1e6)} MB", target
return repr(value.value), target
# Just for (Bot API) versions number auto add in constants:
if isinstance(value, str) and target in (
"telegram.constants.BOT_API_VERSION",
"telegram.__version__",
):
return value, target
if isinstance(value, tuple) and target in (
"telegram.constants.BOT_API_VERSION_INFO",
"telegram.__version_info__",
):
return str(value), target
if (
isinstance(value, dtm.datetime)
and value == telegram.constants.ZERO_DATE
and target in ("telegram.constants.ZERO_DATE",)
):
return repr(value), target
sphinx_logger.warning(
"%s:%d: WARNING: Did not convert reference %s. :%s: is not supposed"
" to be used with this type of target.",
refnode.source,
refnode.line,
refnode.rawsource,
CONSTANTS_ROLE,
)
except Exception as exc:
sphinx_logger.exception(
"%s:%d: WARNING: Did not convert reference %s due to an exception.",
refnode.source,
refnode.line,
refnode.rawsource,
exc_info=exc,
)
return title, target
else:
return title, target
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