function doWork()

in resources/web/lib/prettify/prettify.js [1571:1698]
96 lines of code
37 McCabe index (conditional complexity)

    function doWork() {
      var endTime = (win['PR_SHOULD_USE_CONTINUATION'] ?
                     clock['now']() + 250 /* ms */ :
                     Infinity);
      for (; k < elements.length && clock['now']() < endTime; k++) {
        var cs = elements[k];

        // Look for a preceding comment like
        // <?prettify lang="..." linenums="..."?>
        var attrs = EMPTY;
        {
          for (var preceder = cs; (preceder = preceder.previousSibling);) {
            var nt = preceder.nodeType;
            // <?foo?> is parsed by HTML 5 to a comment node (8)
            // like <!--?foo?-->, but in XML is a processing instruction
            var value = (nt === 7 || nt === 8) && preceder.nodeValue;
            if (value
                ? !/^\??prettify\b/.test(value)
                : (nt !== 3 || /\S/.test(preceder.nodeValue))) {
              // Skip over white-space text nodes but not others.
              break;
            }
            if (value) {
              attrs = {};
              value.replace(
                  /\b(\w+)=([\w:.%+-]+)/g,
                function (_, name, value) { attrs[name] = value; });
              break;
            }
          }
        }

        var className = cs.className;
        if ((attrs !== EMPTY || prettyPrintRe.test(className))
            // Don't redo this if we've already done it.
            // This allows recalling pretty print to just prettyprint elements
            // that have been added to the page since last call.
            && !prettyPrintedRe.test(className)) {

          // make sure this is not nested in an already prettified element
          var nested = false;
          for (var p = cs.parentNode; p; p = p.parentNode) {
            var tn = p.tagName;
            if (preCodeXmpRe.test(tn)
                && p.className && prettyPrintRe.test(p.className)) {
              nested = true;
              break;
            }
          }
          if (!nested) {
            // Mark done.  If we fail to prettyprint for whatever reason,
            // we shouldn't try again.
            cs.className += ' prettyprinted';

            // If the classes includes a language extensions, use it.
            // Language extensions can be specified like
            //     <pre class="prettyprint lang-cpp">
            // the language extension "cpp" is used to find a language handler
            // as passed to PR.registerLangHandler.
            // HTML5 recommends that a language be specified using "language-"
            // as the prefix instead.  Google Code Prettify supports both.
            // http://dev.w3.org/html5/spec-author-view/the-code-element.html
            var langExtension = attrs['lang'];
            if (!langExtension) {
              langExtension = className.match(langExtensionRe);
              // Support <pre class="prettyprint"><code class="language-c">
              var wrapper;
              if (!langExtension && (wrapper = childContentWrapper(cs))
                  && codeRe.test(wrapper.tagName)) {
                langExtension = wrapper.className.match(langExtensionRe);
              }

              if (langExtension) { langExtension = langExtension[1]; }
            }

            var preformatted;
            if (preformattedTagNameRe.test(cs.tagName)) {
              preformatted = 1;
            } else {
              var currentStyle = cs['currentStyle'];
              var defaultView = doc.defaultView;
              var whitespace = (
                  currentStyle
                  ? currentStyle['whiteSpace']
                  : (defaultView
                     && defaultView.getComputedStyle)
                  ? defaultView.getComputedStyle(cs, null)
                  .getPropertyValue('white-space')
                  : 0);
              preformatted = whitespace
                  && 'pre' === whitespace.substring(0, 3);
            }

            // Look for a class like linenums or linenums:<n> where <n> is the
            // 1-indexed number of the first line.
            var lineNums = attrs['linenums'];
            if (!(lineNums = lineNums === 'true' || +lineNums)) {
              lineNums = className.match(/\blinenums\b(?::(\d+))?/);
              lineNums =
                lineNums
                ? lineNums[1] && lineNums[1].length
                  ? +lineNums[1] : true
                : false;
            }
            if (lineNums) { numberLines(cs, lineNums, preformatted); }

            // do the pretty printing
            var prettyPrintingJob = {
              langExtension: langExtension,
              sourceNode: cs,
              numberLines: lineNums,
              pre: preformatted,
              sourceCode: null,
              basePos: null,
              spans: null,
              decorations: null
            };
            applyDecorator(prettyPrintingJob);
          }
        }
      }
      if (k < elements.length) {
        // finish up in a continuation
        win.setTimeout(doWork, 250);
      } else if ('function' === typeof opt_whenDone) {
        opt_whenDone();
      }
    }