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- # Copyright (c) 2025-2026 Buf Technologies, Inc.
- #
- # 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.
- from __future__ import annotations
- from typing import TypeVar
- from ._message import Message
- T = TypeVar("T", bound=Message)
- def merge_from(target: T, source: T, *, ignore_unknown_fields: bool = False) -> None:
- """Merges the fields from source into target.
- Merge rules by field kind:
- - Scalar and enum: the existing value is overwritten.
- - Message: recursively merged if already present, otherwise set.
- - Repeated: elements are appended.
- - Map: entries are added; existing keys are overwritten. Message-valued map entries are not merged.
- - Unknown fields: retained unless `ignore_unknown_fields` is `True`.
- Args:
- target: The message instance to merge into.
- source: The message instance to merge from.
- ignore_unknown_fields: Whether to ignore unknown fields during the merge.
- """
- target._merge_from(source, ignore_unknown_fields)
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