highlightWords

Highlight Words

Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greasyforks.org/scripts/535935/1588732/highlightWords.js

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Wrap lines

function escapeRegex(string) {
  return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
}

function highlightWords(words, highlightClass = 'highlight') {
  if (!words || words.length === 0) return;

  // Create patterns for words and phrases
  const patterns = words.map(word => {
    const trimmed = word.trim();
    if (trimmed.includes(' ')) {
      // Handle phrases
      const parts = trimmed.split(/\s+/);
      const escapedParts = parts.map(escapeRegex);
      const pattern = escapedParts.map(part => `\\b${part}\\b`).join('\\s+');
      return { pattern, numWords: parts.length };
    } else {
      // Handle single words
      const escaped = escapeRegex(trimmed);
      const pattern = `\\b${escaped}\\b`;
      return { pattern, numWords: 1 };
    }
  });

  // Sort patterns by number of words descending to match longer phrases first
  patterns.sort((a, b) => b.numWords - a.numWords);

  // Create the regex pattern by joining all patterns with '|'
  const regexPattern = patterns.map(p => p.pattern).join('|');
  const regex = new RegExp(regexPattern, 'gi');

  // Select text nodes excluding script, style, and already highlighted elements
  const xpath = `//text()[not(ancestor::script) and not(ancestor::style) and not(ancestor::*[contains(concat(" ", normalize-space(@class), " "), " ${highlightClass} ")])]`;
  const textNodes = document.evaluate(xpath, document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);

  for (let i = 0; i < textNodes.snapshotLength; i++) {
    const textNode = textNodes.snapshotItem(i);
    const text = textNode.nodeValue;
    const matches = [...text.matchAll(regex)];

    if (matches.length > 0) {
      const fragment = document.createDocumentFragment();
      let lastIndex = 0;

      for (const match of matches) {
        const offset = match.index;
        if (offset > lastIndex) {
          fragment.appendChild(document.createTextNode(text.slice(lastIndex, offset)));
        }
        const span = document.createElement('span');
        span.className = highlightClass;
        span.textContent = match[0];
        fragment.appendChild(span);
        lastIndex = offset + match[0].length;
      }

      if (lastIndex < text.length) {
        fragment.appendChild(document.createTextNode(text.slice(lastIndex)));
      }

      textNode.parentNode.replaceChild(fragment, textNode);
    }
  }
}