68 lines
2.4 KiB
JavaScript
68 lines
2.4 KiB
JavaScript
// Copyright 2021-2025 Buf Technologies, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import { reflect } from "./reflect/reflect.js";
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/**
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* Merge message `source` into message `target`, following Protobuf semantics.
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*
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* This is the same as serializing the source message, then deserializing it
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* into the target message via `mergeFromBinary()`, with one difference:
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* While serialization will create a copy of all values, `merge()` will copy
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* the reference for `bytes` and messages.
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*
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* Also see https://protobuf.com/docs/language-spec#merging-protobuf-messages
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*/
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export function merge(schema, target, source) {
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reflectMerge(reflect(schema, target), reflect(schema, source));
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}
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function reflectMerge(target, source) {
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var _a;
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var _b;
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const sourceUnknown = source.message.$unknown;
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if (sourceUnknown !== undefined && sourceUnknown.length > 0) {
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(_a = (_b = target.message).$unknown) !== null && _a !== void 0 ? _a : (_b.$unknown = []);
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target.message.$unknown.push(...sourceUnknown);
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}
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for (const f of target.fields) {
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if (!source.isSet(f)) {
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continue;
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}
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switch (f.fieldKind) {
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case "scalar":
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case "enum":
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target.set(f, source.get(f));
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break;
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case "message":
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if (target.isSet(f)) {
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reflectMerge(target.get(f), source.get(f));
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}
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else {
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target.set(f, source.get(f));
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}
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break;
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case "list":
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const list = target.get(f);
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for (const e of source.get(f)) {
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list.add(e);
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}
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break;
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case "map":
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const map = target.get(f);
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for (const [k, v] of source.get(f)) {
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map.set(k, v);
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}
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break;
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}
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}
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}
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