Function highlightBlock

documentation/javascript/application.js:629–678

(block, tabReplace, useBR)

  two optional parameters for fixMarkup.
  */
  function highlightBlock(block, tabReplace, useBR) {
    var text = blockText(block, useBR);
    var language = blockLanguage(block);
    var result, pre;
    if (language == 'no-highlight')
        return;
    if (language) {
      result = highlight(language, text);
    } else {
      result = highlightAuto(text);
      language = result.language;
    }
    var original = nodeStream(block);
    if (original.length) {
      pre = document.createElement('pre');
      pre.innerHTML = result.value;
      result.value = mergeStreams(original, nodeStream(pre), text);
    }
    result.value = fixMarkup(result.value, tabReplace, useBR);

    var class_name = block.className;
    if (!class_name.match('(\\s|^)(language-)?' + language + '(\\s|$)')) {
      class_name = class_name ? (class_name + ' ' + language) : language;
    }
    if (/MSIE [678]/.test(navigator.userAgent) && block.tagName == 'CODE' && block.parentNode.tagName == 'PRE') {
      // This is for backwards compatibility only. IE needs this strange
      // hack becasue it cannot just cleanly replace <code> block contents.
      pre = block.parentNode;
      var container = document.createElement('div');
      container.innerHTML = '<pre><code>' + result.value + '</code></pre>';
      block = container.firstChild.firstChild;
      container.firstChild.className = pre.className;
      pre.parentNode.replaceChild(container.firstChild, pre);
    } else {
      block.innerHTML = result.value;
    }
    block.className = class_name;
    block.result = {
      language: language,
      kw: result.keyword_count,
      re: result.relevance
    };
    if (result.second_best) {
      block.second_best = {
        language: result.second_best.language,
        kw: result.second_best.keyword_count,
        re: result.second_best.relevance
      };
    }
  }

  /*
  Applies highlighting to all <pre><code>..</code></pre> blocks on a page.