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66 lines
2.2 KiB
66 lines
2.2 KiB
// Copyright 2021-2024 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 { ScalarType } from "./descriptors.js";
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import { reflect } from "./reflect/reflect.js";
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import { isReflectMessage } from "./reflect/guard.js";
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/**
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* Create a deep copy of a message, including extensions and unknown fields.
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*/
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export function clone(schema, message) {
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return cloneReflect(reflect(schema, message)).message;
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}
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function cloneReflect(i) {
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const o = reflect(i.desc);
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for (const f of i.fields) {
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if (!i.isSet(f)) {
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continue;
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}
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switch (f.fieldKind) {
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default: {
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o.set(f, cloneSingular(f, i.get(f)));
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break;
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}
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case "list":
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// eslint-disable-next-line no-case-declarations
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const list = o.get(f);
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for (const item of i.get(f)) {
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list.add(cloneSingular(f, item));
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}
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break;
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case "map":
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// eslint-disable-next-line no-case-declarations
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const map = o.get(f);
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for (const entry of i.get(f).entries()) {
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map.set(entry[0], cloneSingular(f, entry[1]));
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}
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break;
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}
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}
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const unknown = i.getUnknown();
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if (unknown && unknown.length > 0) {
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o.setUnknown([...unknown]);
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}
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return o;
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}
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function cloneSingular(field, value) {
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if (field.message !== undefined && isReflectMessage(value)) {
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return cloneReflect(value);
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}
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if (field.scalar == ScalarType.BYTES && value instanceof Uint8Array) {
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// @ts-expect-error T cannot extend Uint8Array in practice
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return value.slice();
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}
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return value;
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}
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