Convert URL text to link for Tampermonky

Text2Link.js

// ==UserScript==
// @name         Text2Link
// @namespace    http://www.sanno-net.com/text2link
// @version      1.0
// @description  try to take over the world!
// @author       You
// @match        https://teratail.com/*
// @grant        none
// ==/UserScript==

(function () {
  ("use strict");

  /**
   * @param {HTMLElement} parentElement
   */
  const text2Link = parentElement => {
    parentElement = parentElement ?? document.querySelector("body");

    parentElement.childNodes.forEach(node => {
      if (node.nodeType === Node.TEXT_NODE) {
        const trimmedText = node.textContent.replace(/[\r\n\t 　]/, "");
        if (trimmedText !== "") {
          let text = node.textContent;
          const replaceNodes = [];
          const regexp = /https?:\/\/[a-z0-9#\?=\-_&\.\(\)\^\/\+]+/g;
          let m;
          while ((m = regexp.exec(text)) !== null) {
            const beforeUrl = document.createTextNode(text.substr(0, m.index));
            replaceNodes.push(beforeUrl);

            const link = document.createElement("span");
            link.classList.add("Text2Link");
            link.setAttribute("data-url", m[0]);
            link.textContent = m[0];
            replaceNodes.push(link);

            text = text.substr(m.index + m[0].length);
            if (!text) break;
          }
          if (0 < replaceNodes.length) {
            if (text) replaceNodes.push(document.createTextNode(text));

            const parent = node.parentElement;
            replaceNodes.forEach(n => parent.insertBefore(n, node));
            parent.removeChild(node);
          }
        }
      } else if (node.nodeType === Node.ELEMENT_NODE) {
        if (node.nodeName !== "A" && node.nodeName !== "SCRIPT")
          text2Link(node);
      }
    });
  };
  text2Link();

  document.addEventListener("keydown", e => {
    if ((e.key === "Control" || e.key === "Shift") && !e.repeat) {
      if (e.ctrlKey || e.shiftKey) {
        document.querySelectorAll(".Text2Link").forEach(element => {
          element.childNodes.forEach(n => element.removeChild(n));
          const a = document.createElement("a");
          a.href = element.getAttribute("data-url");
          a.textContent = a.href;
          element.appendChild(a);
        });
      }
    }
  });
  document.addEventListener("keyup", e => {
    if (e.key === "Control" || e.key === "Shift") {
      if (!e.ctrlKey && !e.shiftKey) {
        document.querySelectorAll(".Text2Link").forEach(element => {
          element.childNodes.forEach(n => element.removeChild(n));
          element.textContent = element.getAttribute("data-url");
        });
      }
    }
  });
})();