@adguard/agtree/dist/serializer/filterlist-serializer.js

Tool set for working with adblock filter lists

/*
 * AGTree v3.2.2 (build date: Tue, 08 Jul 2025 13:39:47 GMT)
 * (c) 2025 Adguard Software Ltd.
 * Released under the MIT license
 * https://github.com/AdguardTeam/tsurlfilter/tree/master/packages/agtree#readme
 */
import { NULL } from '../utils/constants.js';
import { isUndefined } from '../utils/type-guards.js';
import { BaseSerializer } from './base-serializer.js';
import { RuleSerializer } from './rule-serializer.js';
import { FilterListNodeMarshallingMap } from '../marshalling-utils/filter-list-common.js';
import { BinaryTypeMarshallingMap } from '../marshalling-utils/misc/binary-type-common.js';

/**
 * Serializes filter list nodes to binary format.
 */
class FilterListSerializer extends BaseSerializer {
    /**
     * Serializes a filter list node to binary format.
     *
     * @param node Node to serialize.
     * @param buffer ByteBuffer for writing binary data.
     */
    // TODO: add support for raws, if ever needed
    static serialize(node, buffer) {
        buffer.writeUint8(BinaryTypeMarshallingMap.FilterListNode);
        buffer.writeUint8(FilterListNodeMarshallingMap.Children);
        const count = node.children.length;
        buffer.writeUint32(count);
        for (let i = 0; i < count; i += 1) {
            RuleSerializer.serialize(node.children[i], buffer);
        }
        if (!isUndefined(node.start)) {
            buffer.writeUint8(FilterListNodeMarshallingMap.Start);
            buffer.writeUint32(node.start);
        }
        if (!isUndefined(node.end)) {
            buffer.writeUint8(FilterListNodeMarshallingMap.End);
            buffer.writeUint32(node.end);
        }
        buffer.writeUint8(NULL);
    }
}

export { FilterListSerializer };