parse-domain/build/trie/serialize-trie.js

Splits a hostname into subdomains, domain and (effective) top-level domains

import { DOWN, UP, SAME } from "./characters.js";
export const serializeTrie = (root) => {
    let serialized = "";
    const queue = Array.from(root.children.values());
    let current;
    while ((current = queue.shift()) !== undefined) {
        if (current === UP) {
            serialized += UP;
            continue;
        }
        serialized += current.label;
        if (current.children.size === 0) {
            if (queue.length > 0 && queue[0] !== UP) {
                serialized += SAME;
            }
            continue;
        }
        serialized += DOWN;
        const newItems = Array.from(current.children.values());
        if (queue.length > 0) {
            newItems.push(UP);
        }
        queue.unshift(...newItems);
    }
    return serialized;
};
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