/
custom_typing.py
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/
custom_typing.py
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# Copyright 2022 The PyGlove 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.
"""Interface for intercepting typing checking."""
import abc
from typing import Any, Callable, Optional, Tuple
from pyglove.core import object_utils
from pyglove.core.typing import class_schema
class CustomTyping(metaclass=abc.ABCMeta):
"""Interface of custom value type.
Instances of subclasses of CustomTyping can be assigned to fields of
any ValueSpec, and take over `apply` via `custom_apply` method.
As a result, CustomTyping makes the schema system extensible without modifying
existing value specs. For example, value generators can extend CustomTyping
and be assignable to any fields.
"""
@abc.abstractmethod
def custom_apply(
self,
path: object_utils.KeyPath,
value_spec: class_schema.ValueSpec,
allow_partial: bool,
child_transform: Optional[Callable[
[object_utils.KeyPath, class_schema.Field, Any], Any]] = None
) -> Tuple[bool, Any]:
"""Custom apply on a value based on its original value spec.
Args:
path: KeyPath of current object under its object tree.
value_spec: Original value spec for this field.
allow_partial: Whether allow partial object to be created.
child_transform: Function to transform child node values into their final
values. Transform function is called on leaf nodes first, then on their
parents, recursively.
Returns:
A tuple (proceed_with_standard_apply, value_to_proceed).
If proceed_with_standard_apply is set to False, value_to_proceed
will be used as final value.
Raises:
Error when the value is not compatible with the value spec.
"""