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Просмотр файла: clone.js
// Copyright 2021-2025 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.
import { ScalarType } from "./descriptors.js";
import { reflect } from "./reflect/reflect.js";
import { isReflectMessage } from "./reflect/guard.js";
/**
* Create a deep copy of a message, including extensions and unknown fields.
*/
export function clone(schema, message) {
return cloneReflect(reflect(schema, message)).message;
}
function cloneReflect(i) {
const o = reflect(i.desc);
for (const f of i.fields) {
if (!i.isSet(f)) {
continue;
}
switch (f.fieldKind) {
default: {
o.set(f, cloneSingular(f, i.get(f)));
break;
}
case "list":
// eslint-disable-next-line no-case-declarations
const list = o.get(f);
for (const item of i.get(f)) {
list.add(cloneSingular(f, item));
}
break;
case "map":
// eslint-disable-next-line no-case-declarations
const map = o.get(f);
for (const entry of i.get(f).entries()) {
map.set(entry[0], cloneSingular(f, entry[1]));
}
break;
}
}
const unknown = i.getUnknown();
if (unknown && unknown.length > 0) {
o.setUnknown([...unknown]);
}
return o;
}
function cloneSingular(field, value) {
if (field.message !== undefined && isReflectMessage(value)) {
return cloneReflect(value);
}
if (field.scalar == ScalarType.BYTES && value instanceof Uint8Array) {
// @ts-expect-error T cannot extend Uint8Array in practice
return value.slice();
}
return value;
}
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