export function normalizeHeadings()

in scripts/lib-franklin.js [549:570]

• 20 lines of code
• 8 McCabe index (conditional complexity)

export function normalizeHeadings(el, allowedHeadings) {
  const allowed = allowedHeadings.map((h) => h.toLowerCase());
  el.querySelectorAll('h1, h2, h3, h4, h5, h6').forEach((tag) => {
    const h = tag.tagName.toLowerCase();
    if (allowed.indexOf(h) === -1) {
      // current heading is not in the allowed list -> try first to "promote" the heading
      let level = parseInt(h.charAt(1), 10) - 1;
      while (allowed.indexOf(`h${level}`) === -1 && level > 0) {
        level -= 1;
      }
      if (level === 0) {
        // did not find a match -> try to "downgrade" the heading
        while (allowed.indexOf(`h${level}`) === -1 && level < 7) {
          level += 1;
        }
      }
      if (level !== 7) {
        tag.outerHTML = `<h${level} id="${tag.id}">${tag.textContent}</h${level}>`;
      }
    }
  });
}