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122 lines
4.5 KiB
Python
122 lines
4.5 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 a mutable mapping that keeps track of the keys that where accessed.
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.. versionadded:: 14.0
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Warning:
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Contents of this module are intended to be used internally by the library and *not* by the
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user. Changes to this module are not considered breaking changes and may not be documented in
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the changelog.
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"""
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from collections import UserDict
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from typing import ClassVar, Generic, List, Mapping, Set, Tuple, TypeVar, Union
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from telegram._utils.defaultvalue import DEFAULT_NONE, DefaultValue
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_VT = TypeVar('_VT')
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_KT = TypeVar('_KT')
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_T = TypeVar('_T')
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class TrackingDict(UserDict, Generic[_KT, _VT]):
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"""Mutable mapping that keeps track of which keys where accessed with write access.
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Read-access is not tracked.
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Note:
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* ``setdefault()`` and ``pop`` are considered writing only depending on whether the
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key is present
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* deleting values is considered writing
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"""
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DELETED: ClassVar = object()
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"""Special marker indicating that an entry was deleted."""
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__slots__ = ('_write_access_keys',)
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def __init__(self) -> None:
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super().__init__()
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self._write_access_keys: Set[_KT] = set()
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def __track_write(self, key: Union[_KT, Set[_KT]]) -> None:
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if isinstance(key, set):
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self._write_access_keys |= key
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else:
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self._write_access_keys.add(key)
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def pop_accessed_keys(self) -> Set[_KT]:
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"""Returns all keys that were write-accessed since the last time this method was called."""
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out = self._write_access_keys
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self._write_access_keys = set()
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return out
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def pop_accessed_write_items(self) -> List[Tuple[_KT, _VT]]:
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"""
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Returns all keys & corresponding values as set of tuples that were write-accessed since
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the last time this method was called. If a key was deleted, the value will be
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:attr:`DELETED`.
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"""
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keys = self.pop_accessed_keys()
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return [(key, self[key] if key in self else self.DELETED) for key in keys]
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def mark_as_accessed(self, key: _KT) -> None:
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"""Use this method have the key returned again in the next call to
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:meth:`pop_accessed_write_items` or :meth:`pop_accessed_keys`
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"""
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self._write_access_keys.add(key)
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# Override methods to track access
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def __setitem__(self, key: _KT, value: _VT) -> None:
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self.__track_write(key)
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super().__setitem__(key, value)
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def __delitem__(self, key: _KT) -> None:
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self.__track_write(key)
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super().__delitem__(key)
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def update_no_track(self, mapping: Mapping[_KT, _VT]) -> None:
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"""Like ``update``, but doesn't count towards write access."""
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for key, value in mapping.items():
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self.data[key] = value
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# Mypy seems a bit inconsistent about what it wants as types for `default` and return value
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# so we just ignore a bit
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def pop( # type: ignore[override]
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self, key: _KT, default: _VT = DEFAULT_NONE # type: ignore[assignment]
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) -> _VT:
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if key in self:
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self.__track_write(key)
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if isinstance(default, DefaultValue):
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return super().pop(key)
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return super().pop(key, default=default)
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def clear(self) -> None:
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self.__track_write(set(super().keys()))
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super().clear()
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# Mypy seems a bit inconsistent about what it wants as types for `default` and return value
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# so we just ignore a bit
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def setdefault(self: 'TrackingDict[_KT, _T]', key: _KT, default: _T = None) -> _T:
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if key in self:
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return self[key]
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self.__track_write(key)
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self[key] = default # type: ignore[assignment]
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return default # type: ignore[return-value]
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