MediaWiki:Common.js

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(function () {

  // ── 1. Load Sanscript from a reliable CDN ──────────────────────
  var sanscriptReady = false;
  var s = document.createElement('script');
  s.src = 'https://cdn.jsdelivr.net/gh/sanskrit-coders/sanscript.js@master/sanscript.js';
  s.onload = function () { sanscriptReady = true; };
  document.head.appendChild(s);

  // ── 2. Character maps ──────────────────────────────────────────
  var SCRIPT_MAP = {
    kn: {
      'अ':'ಅ','आ':'ಆ','इ':'ಇ','ई':'ಈ','उ':'ಉ','ऊ':'ಊ','ऋ':'ಋ',
      'ए':'ಏ','ऐ':'ಐ','ओ':'ಓ','औ':'ಔ','ऽ':'ಽ',
      'क':'ಕ','ख':'ಖ','ग':'ಗ','घ':'ಘ','ङ':'ಙ',
      'च':'ಚ','छ':'ಛ','ज':'ಜ','झ':'ಝ','ञ':'ಞ',
      'ट':'ಟ','ठ':'ಠ','ड':'ಡ','ढ':'ಢ','ण':'ಣ',
      'त':'ತ','थ':'ಥ','द':'ದ','ध':'ಧ','न':'ನ',
      'प':'ಪ','फ':'ಫ','ब':'ಬ','भ':'ಭ','म':'ಮ',
      'य':'ಯ','र':'ರ','ल':'ಲ','व':'ವ',
      'श':'ಶ','ष':'ಷ','स':'ಸ','ह':'ಹ',
      'ा':'ಾ','ि':'ಿ','ी':'ೀ','ु':'ು','ू':'ೂ',
      'ृ':'ೃ','े':'ೇ','ै':'ೈ','ो':'ೋ','ौ':'ೌ',
      'ं':'ಂ','ः':'ಃ','्':'್',
      '०':'೦','१':'೧','२':'೨','३':'೩','४':'೪',
      '५':'೫','६':'೬','७':'೭','८':'೮','९':'೯'
    },
    ta: {
      'अ':'அ','आ':'ஆ','इ':'இ','ई':'ஈ','उ':'உ','ऊ':'ஊ',
      'ए':'ஏ','ऐ':'ஐ','ओ':'ஓ','औ':'ஔ',
      'क':'க','ख':'க','ग':'க','घ':'க','ङ':'ங',
      'च':'ச','छ':'ச','ज':'ஜ','झ':'ஜ','ञ':'ஞ',
      'ट':'ட','ठ':'ட','ड':'ட','ढ':'ட','ண':'ண',
      'त':'த','थ':'த','द':'த','ध':'த','न':'ந',
      'प':'ப','फ':'ப','ब':'ப','भ':'ப','म':'ம',
      'य':'ய','र':'ர','ल':'ல','व':'வ',
      'श':'ஶ','ष':'ஷ','स':'ஸ','ह':'ஹ',
      'ा':'ா','ि':'ி','ी':'ீ','ு':'ு','ू':'ூ',
      'े':'ே','ै':'ை','ो':'ோ','ौ':'ௌ',
      'ं':'ம்','ः':':','्':'்','ॐ':'ௐ',
      '०':'0','१':'1','२':'2','३':'3','४':'4',
      '५':'5','६':'6','७':'7','௮':'8','९':'9'
    }
  };

  var PRE = [
    [/ङ्क/g,'ंक'],[/ङ्ख/g,'ंख'],[/ङ्ग/g,'ंग'],[/ङ्घ/g,'ंघ'],
    [/ञ्च/g,'ंच'],[/ञ्ज/g,'ंज'],[/ण्ट/g,'ंट'],[/ण्ड/g,'ंड'],
    [/न्त/g,'ंत'],[/न्द/g,'ंद'],[/म्ब/g,'ंब'],[/म्भ/g,'ंभ']
  ];

  function preProcess(t) {
    PRE.forEach(function (p) { t = t.replace(p[0], p[1]); });
    return t;
  }

  function transliterateText(text, script) {
    if (script === 'en') {
      if (sanscriptReady && window.Sanscript) {
        return window.Sanscript.t(text, 'devanagari', 'iast');
      }
      return text;
    }
    var map = SCRIPT_MAP[script];
    if (!map) return text;
    return Array.from(preProcess(text)).map(function (ch) {
      return map[ch] !== undefined ? map[ch] : ch;
    }).join('');
  }

  function applyScript(script) {
    var content = document.querySelector('.mw-parser-output');
    if (!content) return;

    // Restore devanagari first
    content.querySelectorAll('[data-deva]').forEach(function (el) {
      el.textContent = el.getAttribute('data-deva');
      el.removeAttribute('data-deva');
    });

    if (script === 'deva') return;

    // If English but Sanscript not ready, retry after short delay
    if (script === 'en' && (!sanscriptReady || !window.Sanscript)) {
      setTimeout(function () { applyScript('en'); }, 300);
      return;
    }

    var walker = document.createTreeWalker(content, NodeFilter.SHOW_TEXT);
    var nodes = [];
    while (walker.nextNode()) nodes.push(walker.currentNode);

    nodes.forEach(function (node) {
      var p = node.parentNode;
      if (!p) return;
      // Skip switcher bar, TOC, and edit links
      if (p.closest) {
        if (p.closest('.gr-script-bar') ||
            p.closest('.vector-toc') ||
            p.closest('#toc') ||
            p.closest('.mw-editsection')) return;
      }
      var orig = node.textContent;
      var trans = transliterateText(orig, script);
      if (trans !== orig) {
        var span = document.createElement('span');
        span.setAttribute('data-deva', orig);
        span.textContent = trans;
        p.replaceChild(span, node);
      }
    });
  }

  // ── 3. Build switcher bar ──────────────────────────────────────
  function buildBar() {
    var title = document.querySelector('.gr-doc-title');
    if (!title) return;
    if (document.querySelector('.gr-script-bar')) return;

    var bar = document.createElement('div');
    bar.className = 'gr-script-bar';
    bar.innerHTML =
      '<span class="gr-script-label">change script to</span>' +
      '<a class="gr-script-btn active" data-script="deva">देवनागरी</a>' +
      '<a class="gr-script-btn" data-script="kn">ಕನ್ನಡ</a>' +
      '<a class="gr-script-btn" data-script="ta">தமிழ்</a>' +
      '<a class="gr-script-btn" data-script="en">English</a>';

    title.after(bar);

    bar.querySelectorAll('.gr-script-btn').forEach(function (btn) {
      btn.addEventListener('click', function (e) {
        e.preventDefault();
        bar.querySelectorAll('.gr-script-btn').forEach(function (b) {
          b.classList.remove('active');
        });
        btn.classList.add('active');
        applyScript(btn.getAttribute('data-script'));
      });
    });
  }

  // Run on DOMContentLoaded to ensure bar persists on refresh
  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', buildBar);
  } else {
    buildBar();
  }

  // Also hook MW dynamic loads
  if (window.mw) {
    mw.hook('wikipage.content').add(function () {
      setTimeout(buildBar, 150);
    });
  }

  // ── 4. TOC active highlight via MutationObserver ───────────────
  // Watches class changes on TOC list items so highlight works
  // universally on all pages, not just BS.
  function watchTocActive() {
    var toc = document.querySelector('.vector-toc');
    if (!toc) return;

    var observer = new MutationObserver(function (mutations) {
      mutations.forEach(function (m) {
        if (m.type !== 'attributes' || m.attributeName !== 'class') return;
        var li = m.target;
        var link = li.querySelector(':scope > .vector-toc-link');
        if (!link) return;
        if (li.classList.contains('vector-toc-list-item-active')) {
          link.style.color = '#f57c00';
          link.style.fontWeight = '700';
        } else {
          link.style.color = '';
          link.style.fontWeight = '';
        }
      });
    });

    toc.querySelectorAll('.vector-toc-list-item').forEach(function (li) {
      observer.observe(li, { attributes: true, attributeFilter: ['class'] });
    });
  }

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', watchTocActive);
  } else {
    watchTocActive();
  }

})();