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78 lines
2.9 KiB
78 lines
2.9 KiB
"""
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MIT License
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Copyright (c) 2020 Gabriel Huber
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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-----
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Cheap dataclasses module backport
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Check out the official documentation to see what this is trying to
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achieve:
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https://docs.python.org/3/library/dataclasses.html
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"""
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from __future__ import annotations
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import copy
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from collections import OrderedDict
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from typing import TYPE_CHECKING, Any, Dict, Generator, Tuple
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if TYPE_CHECKING:
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from typing_extensions import Self
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class DataclsBase:
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_defaults: "OrderedDict[str, Any]"
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def __init__(self, **kwargs: Any) -> None:
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for name, value in self._defaults.items():
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if name in kwargs:
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value = kwargs[name]
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setattr(self, name, copy.copy(value))
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def __iter__(self) -> Generator[Tuple[str, Any], None, None]:
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for name in self.__annotations__:
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yield (name, getattr(self, name))
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def __repr__(self) -> str:
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return "{}({})".format(self.__class__.__name__, ", ".join(name + "=" + repr(value) for name, value in self))
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class DataclsMeta(type):
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def __new__(cls, name: str, bases: Tuple[type, ...], prop: Dict[str, Any]) -> Self:
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values: OrderedDict[str, Any] = OrderedDict()
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for member_name in prop["__annotations__"].keys():
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# Check if member has a default value set as class variable
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if member_name in prop:
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# Store default value and remove the class variable
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values[member_name] = prop[member_name]
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del prop[member_name]
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else:
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# Set None as the default value
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values[member_name] = None
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prop["__slots__"] = list(values.keys())
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prop["_defaults"] = values
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bases = (DataclsBase, *bases)
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return super().__new__(cls, name, bases, prop)
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def __prepare__(self, *args: Any, **kwargs: Any) -> OrderedDict[str, Any]: # type: ignore # this is custom overriden
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return OrderedDict()
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