YouTube Embedder

Convert links and optionally URL text which points to a YouTube video, into embedded YouTube frame. For URL text, it can be converted to a link only.
目前為 2018-05-07 提交的版本，檢視最新版本。
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// ==UserScript==
// @name         YouTube Embedder
// @namespace    https://gf.qytechs.cn/en/users/85671-jcunews
// @description  Convert links and optionally URL text which points to a YouTube video, into embedded YouTube frame. For URL text, it can be converted to a link only.
// @author       jcunews
// @version      1.0.1
// @license      GNU AGPLv3
// @match        *://*/*
// @exclude      *://www.youtube.com/embed/*
// @grant        none
// ==/UserScript==

(function(xe, fe, ce, rx, trx, trxg, hrx, lo) {

  //===== CONFIGURATION BEGIN =====

  //The minimum width & height of the container element where the link or URL text is found, in order to apply the conversion.
  var minimumWidth  = 256;
  var minimumHeight = 144;

  //Embedded YouTube frame width in pixels (should be multiplication of 16).
  //If zero, the width is the container element width of the link or URL text, and the height is calculated using 16:9 ratio (widescreen video dimension).
  //If the final width is smaller than the minimum width setting, and if the source is an URL text, it will be converted to a link instead.
  var frameWidth = 0;

  //Enable URL text to YouTube frame converter (aside from links).
  var convertUrlText = true;

  //Convert to link only, when on these domains.
  var convertToLinkOnlyDomains = /www\.youtube\.com|somesite\.info|subnet\d+\.other\.net/i;

  //===== CONFIGURATION END =====

  function linkToFrame(node, m, pn, w, h, a) {
    if (node.attributes["ytebd_nocovert"] || !node.offsetWidth || !node.offsetHeight) return;
    if (!lo && (m = node.href.match(rx))) {
      m = "https://www.youtube.com/embed/" + m[1];
      pn = node.parentNode;
      while (pn) {
        if (pn.scrollHeight > pn.offsetHeight) break;
        pn = pn.parentNode;
      }
      h = ((pn || node.parentNode).offsetHeight * 0.9) >> 0;
      w = frameWidth > 0 ? frameWidth : node.parentNode.offsetWidth;
      if ((pn = (w / 16 * 9) >> 0) > h) {
        w = (h / 9 * 16) >> 0;
      } else h = pn;
      if ((w >= minimumWidth) && (h >= minimumHeight)) {
        c = document.createElement("IFRAME");
        c.src = m;
        c.allowFullscreen = true;
        c.referrerPolicy = "no-referrer";
        c.style.border = "none";
        c.width = w;
        c.height = h;
        c.setAttribute("ytebd_nocovert", "1");
        node.replaceWith(c);
      } else if (w && h) node.setAttribute("ytebd_nocovert", "1");
    } else node.setAttribute("ytebd_nocovert", "1");
  }

  function processNode(node, c, m, w, h, pn) {
    switch (node.nodeType) {
      case Node.ELEMENT_NODE:
      case Node.DOCUMENT_NODE:
        if ((node.attributes && node.attributes["ytebd_nocovert"])) break;
        if (node.nodeName === "A") {
          linkToFrame(node);
          node = null;
        }
        if (node && (xe.indexOf(node.nodeName) < 0)) {
          if (fe.indexOf(node.nodeName) >= 0) {
            m = (m = node.src.match(/:\/\/(.*?)\//)) && (m[1] === location.hostname);
          } else m = true;
          if (m && ((node.nodeName !== "A") || convertUrlText)) {
            node.childNodes.forEach(processNode);
          }
        }
        break;
      case Node.TEXT_NODE:
        if (convertUrlText && (m = node.nodeValue.match(trx))) {
          w = node.nodeValue;
          h = -1;
          a = [];
          while (c = trxg.exec(w)) {
            if (c.index > 0) a.push(w.substring(h, c.index));
            a.push("ytebd_" + c[1]);
            h = c.index + c[0].length;
          }
          if ((h > 0) && (h < w.length)) a.push(w.substr(h));
          for (c = a.length - 1; c >= 0; c--) {
            if (!a[c].replace(/^\s+|\s+$/g, "")) a.splice(c, 1);
          }
          if (node.parentNode.nodeName === "A") {
            if (a.length === 1) {
              node.href = "https://www.youtube.com/embed/" + a[0].substr(6);
              node.rel = "nofollow noopener noreferrer";
              node.target = "_blank";
            }
            a = null;
          }
          if (a) {
            pn = node.parentNode;
            c = node.nextSibling;
            a.forEach(function(v, i, n) {
              if (v.substr(0, 6) !== "ytebd_") {
                n = document.createTextNode(v);
              } else {
                n = document.createElement("A");
                n.textContent = "[Link]";
                n.title = v.substr(6);
                n.href = "https://www.youtube.com/embed/" + v.substr(6);
                n.rel = "nofollow noopener noreferrer";
                n.target = "_blank";
              }
              if (i > 0) {
                pn.insertBefore(n, c);
              } else {
                node.replaceWith(n);
              }
            });
          }
        }
    }
  }

  xe = ["BUTTON", "INPUT", "SCRIPT", "SELECT", "STYLE"];
  fe = ["FRAME", "IFRAME"];
  rx = /^(?:https?:\/\/)?(?:(?:(?:www\.)?youtube\.com\/)(?:embed\/|watch\?.*v=)|youtu\.be\/)([0-9a-z_\-]{11})/i;
  trx = /(?:https?:\/\/)?(?:(?:(?:www\.)?youtube\.com\/)(?:embed\/|watch\?.*v=)|youtu\.be\/)([0-9a-z_\-]{11})[^\s,'")\]}>]*/i;
  trxg = /(?:https?:\/\/)?(?:(?:(?:www\.)?youtube\.com\/)(?:embed\/|watch\?.*v=)|youtu\.be\/)([0-9a-z_\-]{11})[^\s,'")\]}>]*/gi;
  hrx = /^(?:(?:www\.)?youtube\.com|youtu\.be)$/i;
  lo = convertToLinkOnlyDomains.test(location.hostname);

  (new MutationObserver(function(records) {
    records.forEach(function(record) {
      if (record.type === "childList") {
        record.addedNodes.forEach(processNode);
      } else {
        processNode(record.target);
      }
    });
  })).observe(document.body, {attributes: true, attributeFilter: ["class", "style"], childList: true, subtree: true});

  if (document.body) processNode(document.body);

})();
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