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# Copyright 2024 The etils Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Auto-apply normalization to a dataclass fields."""
from __future__ import annotations
import dataclasses
import typing
from typing import Any, TypeVar
from etils.edc import field_utils
from etils.edc import helpers
from typing_extensions import Annotated
_T = TypeVar('_T')
_IS_NORMALIZED = object()
if typing.TYPE_CHECKING:
# TODO(b/254514368): Remove hack
class _AutoCastMeta(type):
def __getitem__(cls, value):
return value
class AutoCast(metaclass=_AutoCastMeta):
pass
else:
AutoCast = Annotated[_T, _IS_NORMALIZED] # pytype: disable=invalid-typevar
def make_auto_cast_descriptor(
field: dataclasses.Field[Any], hint: helpers.Hint
) -> helpers.Descriptor:
"""Apply the auto-casting magic to a single class."""
# TODO(epot): Support `Optional`
if field.default_factory is not dataclasses.MISSING:
raise ValueError(
f'dataclass field {field.name} cannot be both `AutoCast` and'
' `default_factory=`'
)
# TODO(epot): Propagate other field_kwargs (through likely not necessary)
return field_utils.field(validate=hint)
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