gott/wwwroot/js/emoji.js

// ── Fluent Emoji Replacement ──
// Replaces Unicode emojis in rendered Markdown HTML with Fluent Emoji 3D images.
// Uses lobehub's CDN-hosted Microsoft Fluent Emoji 3D set (WebP format).

var FLUENT_EMOJI_CDN = 'https://cdn.jsdelivr.net/npm/@lobehub/fluent-emoji-3d@1.1.0/assets/';
var _emojiFailCache = {}; // Track permanently failed emoji codepoints

// Comprehensive emoji regex (from AdvenaHQ/fluent-emoji, MIT licensed)
// Covers ZWJ sequences, flags, keycaps, skin tones, text-style emojis, etc.
var _emojiRegex = 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\udd30-\udd39\udd3d\udd3e\udd77\uddb5\uddb6\uddb8\uddb9\uddbb\uddcd-\uddcf\uddd1-\udddd\udec3-\udec5\udef0-\udef6]|[\u270a\u270b]))(?:\ud83c[\udffb-\udfff])?|(?:\ud83c\udff4\udb40\udc67\udb40\udc62\udb40\udc65\udb40\udc6e\udb40\udc67\udb40\udc7f|\ud83c\udff4\udb40\udc67\udb40\udc62\udb40\udc73\udb40\udc63\udb40\udc74\udb40\udc7f|\ud83c\udff4\udb40\udc67\udb40\udc62\udb40\udc77\udb40\udc6c\udb40\udc73\udb40\udc7f|\ud83c\udde6\ud83c[\udde8-\uddec\uddee\uddf1\uddf2\uddf4\uddf6-\uddfa\uddfc\uddfd\uddff]|\ud83c\udde7\ud83c[\udde6\udde7\udde9-\uddef\uddf1-\uddf4\uddf6-\uddf9\uddfb\uddfc\uddfe\uddff]|\ud83c\udde8\ud83c[\udde6\udde8\udde9\uddeb-\uddee\uddf0-\uddf5\uddf7\uddfa-\uddff]|\ud83c\udde9\ud83c[\uddea\uddec\uddef\uddf0\uddf2\uddf4\uddff]|\ud83c\uddea\ud83c[\udde6\udde8\uddea\uddec\udded\uddf7-\uddfa]|\ud83c\uddeb\ud83c[\uddee-\uddf0\uddf2\uddf4\uddf7]|\ud83c\uddec\ud83c[\udde6\udde7\udde9-\uddee\uddf1-\uddf3\uddf5-\uddfa\uddfc\uddfe]|\ud83c\udded\ud83c[\uddf0\uddf2\uddf3\uddf7\uddf9\uddfa]|\ud83c\uddee\ud83c[\udde8-\uddea\uddf1-\uddf4\uddf6-\uddf9]|\ud83c\uddef\ud83c[\uddea\uddf2\uddf4\uddf5]|\ud83c\uddf0\ud83c[\uddea\uddec-\uddee\uddf2\uddf3\uddf5\uddf7\uddfc\uddfe\uddff]|\ud83c\uddf1\ud83c[\udde6-\udde8\uddee\uddf0\uddf7-\uddfb\uddfe]|\ud83c\uddf2\ud83c[\udde6\udde8-\udded\uddf0-\uddff]|\ud83c\uddf3\ud83c[\udde6\udde8\uddea-\uddec\uddee\uddf1\uddf4\uddf5\uddf7\uddfa\uddff]|\ud83c\uddf4\ud83c\uddf2|\ud83c\uddf5\ud83c[\udde6\uddea-\udded\uddf0-\uddf3\uddf7-\uddf9\uddfc\uddfe]|\ud83c\uddf6\ud83c\udde6|\ud83c\uddf7\ud83c[\uddea\uddf4\uddf8\uddfa\uddfc]|\ud83c\uddf8\ud83c[\udde6-\uddea\uddec-\uddf4\uddf7-\uddf9\uddfb\uddfd-\uddff]|\ud83c\uddf9\ud83c[\udde6\udde8\udde9\uddeb-\udded\uddef-\uddf4\uddf7\uddf9\uddfb\uddfc\uddff]|\ud83c\uddfa\ud83c[\udde6\uddec\uddf2\uddf3\uddf8\uddfe\uddff]|\ud83c\uddfb\ud83c[\udde6\udde8\uddea\uddec\uddee\uddf3\uddfa]|\ud83c\uddfc\ud83c[\uddeb\uddf8]|\ud83c\uddfd\ud83c\uddf0|\ud83c\uddfe\ud83c[\uddea\uddf9]|\ud83c\uddff\ud83c[\udde6\uddf2\uddfc]|\ud83c[\udccf\udd8e\udd91-\udd9a\udde6-\uddff\ude01\ude32-\ude36\ude38-\ude3a\ude50\ude51\udf00-\udf20\udf2d-\udf35\udf37-\udf7c\udf7e-\udf84\udf86-\udf93\udfa0-\udfc1\udfc5\udfc6\udfc8\udfc9\udfcf-\udfd3\udfe0-\udff0\udff4\udff8-\udfff]|\ud83d[\udc00-\udc3e\udc40\udc44\udc45\udc51-\udc65\udc6a\udc6f\udc79-\udc7b\udc7d-\udc80\udc84\udc88-\udc8e\udc90\udc92-\udca9\udcab-\udcfc\udcff-\udd3d\udd4b-\udd4e\udd50-\udd67\udda4\uddfb-\ude44\ude48-\ude4a\ude80-\udea2\udea4-\udeb3\udeb7-\udebf\udec1-\udec5\uded0-\uded2\uded5-\uded7\udedd-\udedf\udeeb\udeec\udef4-\udefc\udfe0-\udfeb\udff0]|\ud83e[\udd0d\udd0e\udd10-\udd17\udd20-\udd25\udd27-\udd2f\udd3a\udd3c\udd3f-\udd45\udd47-\udd76\udd78-\uddb4\uddb7\uddba\uddbc-\uddcc\uddd0\uddde-\uddff\ude70-\ude74\ude78-\ude7c\ude80-\ude86\ude90-\udeac\udeb0-\udeba\udec0-\udec2\uded0-\uded9\udee0-\udee7]|[\u23e9-\u23ec\u23f0\u23f3\u267e\u26ce\u2705\u2728\u274c\u274e\u2753-\u2755\u2795-\u2797\u27b0\u27bf\ue50a])/g;

function _emojiToCodepoints(emoji) {
  var codepoints = [];
  for (var i = 0; i < emoji.length; i++) {
    var cp = emoji.codePointAt(i);
    if (cp > 0xFFFF) i++; // Skip low surrogate
    codepoints.push(cp.toString(16));
  }
  return codepoints.join('-');
}

/**
 * Global error handler for fluent emoji images.
 * Tries alternate codepoint variants (with/without fe0f) before giving up.
 */
function _fluentEmojiError(img) {
  var cp = img.dataset.cp;
  var tried = parseInt(img.dataset.tried || '0');

  if (tried === 0) {
    // First failure: try toggling fe0f
    var alt = null;
    if (cp.indexOf('-fe0f') !== -1) {
      alt = cp.replace(/-fe0f/g, '');
    } else {
      // Try adding fe0f after first codepoint
      var parts = cp.split('-');
      parts.splice(1, 0, 'fe0f');
      alt = parts.join('-');
    }
    img.dataset.tried = '1';
    img.dataset.cp = alt;
    img.src = FLUENT_EMOJI_CDN + alt + '.webp';
    return;
  }

  // All variants failed → replace with original text emoji
  _emojiFailCache[cp] = true;
  var text = document.createTextNode(img.alt);
  img.parentNode.replaceChild(text, img);
}

function replaceEmojisWithFluent(html) {
  return html.replace(_emojiRegex, function(match) {
    var codepoints = _emojiToCodepoints(match);
    if (_emojiFailCache[codepoints]) return match;
    var url = FLUENT_EMOJI_CDN + codepoints + '.webp';
    return '<img class="fluent-emoji" src="' + url + '" alt="' + match + '" data-cp="' + codepoints + '" data-tried="0" loading="lazy" draggable="false" onerror="_fluentEmojiError(this)">';
  });
}

/**
 * DOM-based emoji replacement.
 * Walks all text nodes inside the given element and replaces Unicode emojis
 * with Fluent Emoji <img> tags. Useful as a post-processing step after
 * innerHTML has been set (catches emojis that the string-based replace missed).
 */
function parseFluentEmojis(container) {
  if (!container) return;
  var walker = document.createTreeWalker(container, NodeFilter.SHOW_TEXT, null);
  var textNodes = [];
  var node;
  while ((node = walker.nextNode())) {
    if (_emojiRegex.test(node.nodeValue)) {
      textNodes.push(node);
    }
    // Reset regex lastIndex (global flag not set, but safety)
    _emojiRegex.lastIndex = 0;
  }
  for (var i = 0; i < textNodes.length; i++) {
    var tn = textNodes[i];
    // Skip text nodes inside <code>, <pre>, <script>, <style>
    var parent = tn.parentNode;
    if (parent && /^(CODE|PRE|SCRIPT|STYLE)$/i.test(parent.tagName)) continue;
    var replaced = tn.nodeValue.replace(_emojiRegex, function(match) {
      var codepoints = _emojiToCodepoints(match);
      if (_emojiFailCache[codepoints]) return match;
      var url = FLUENT_EMOJI_CDN + codepoints + '.webp';
      return '<img class="fluent-emoji" src="' + url + '" alt="' + match + '" data-cp="' + codepoints + '" data-tried="0" loading="lazy" draggable="false" onerror="_fluentEmojiError(this)">';
    });
    if (replaced !== tn.nodeValue) {
      var span = document.createElement('span');
      span.innerHTML = replaced;
      while (span.firstChild) {
        parent.insertBefore(span.firstChild, tn);
      }
      parent.removeChild(tn);
    }
  }
}