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# Copyright 2018-2021 Jay Kamat <jaygkamat@gmail.com>
#
# This file is part of qutebrowser.
#
# qutebrowser is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# qutebrowser 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with qutebrowser. If not, see <https://www.gnu.org/licenses/>.
"""Implementation of a basic config cache."""
from typing import Any, Dict
from qutebrowser.config import config
class ConfigCache:
"""A 'high-performance' cache for the config system.
Useful for areas which call out to the config system very frequently, DO
NOT modify the value returned, DO NOT require per-url settings, and do not
require partially 'expanded' config paths.
If any of these requirements are broken, you will get incorrect or slow
behavior.
"""
def __init__(self) -> None:
self._cache: Dict[str, Any] = {}
config.instance.changed.connect(self._on_config_changed)
def _on_config_changed(self, attr: str) -> None:
if attr in self._cache:
del self._cache[attr]
def __getitem__(self, attr: str) -> Any:
try:
return self._cache[attr]
except KeyError:
assert not config.instance.get_opt(attr).supports_pattern
result = self._cache[attr] = config.instance.get(attr)
return result
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