@adguard/agtree/dist/serializer/misc/value-serializer.js

Tool set for working with adblock filter lists

/*
 * AGTree v3.4.3 (build date: Thu, 11 Dec 2025 13:43:19 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 { ValueNodeMarshallingMap } from '../../marshalling-utils/misc/value-common.js';
import { BinaryTypeMarshallingMap } from '../../marshalling-utils/misc/binary-type-common.js';

/**
 * Value serializer.
 */
class ValueSerializer extends BaseSerializer {
    /**
     * Serializes a value node to binary format.
     *
     * @param node Node to serialize.
     * @param buffer ByteBuffer for writing binary data.
     * @param frequentValuesMap Optional map of frequent values.
     * @param toLower Whether to lowercase the value before the frequent value match (defaults to `false`).
     */
    static serialize(node, buffer, frequentValuesMap, toLower = false) {
        buffer.writeUint8(BinaryTypeMarshallingMap.ValueNode);
        const frequentValue = frequentValuesMap?.get(toLower ? node.value.toLowerCase() : node.value);
        // note: do not use just `if (frequentValue)` because it can be 0
        if (!isUndefined(frequentValue)) {
            buffer.writeUint8(ValueNodeMarshallingMap.FrequentValue);
            buffer.writeUint8(frequentValue);
        }
        else {
            buffer.writeUint8(ValueNodeMarshallingMap.Value);
            buffer.writeString(node.value);
        }
        // note: do not use just `if (node.start)` because it can be 0
        if (!isUndefined(node.start)) {
            buffer.writeUint8(ValueNodeMarshallingMap.Start);
            buffer.writeUint32(node.start);
        }
        if (!isUndefined(node.end)) {
            buffer.writeUint8(ValueNodeMarshallingMap.End);
            buffer.writeUint32(node.end);
        }
        buffer.writeUint8(NULL);
    }
}

export { ValueSerializer };