function walk()

in content/resources/js/prettify.js [935:973]
37 lines of code
12 McCabe index (conditional complexity)

        function walk(node) {
            switch (node.nodeType) {
                case 1:  // Element
                    if (nocode.test(node.className)) { break; }
                    if ('BR' === node.nodeName) {
                        breakAfter(node);
                        // Discard the <BR> since it is now flush against a </LI>.
                        if (node.parentNode) {
                            node.parentNode.removeChild(node);
                        }
                    } else {
                        for (var child = node.firstChild; child; child = child.nextSibling) {
                            walk(child);
                        }
                    }
                    break;
                case 3: case 4:  // Text
                if (isPreformatted) {
                    var text = node.nodeValue;
                    var match = text.match(lineBreak);
                    if (match) {
                        var firstLine = text.substring(0, match.index);
                        node.nodeValue = firstLine;
                        var tail = text.substring(match.index + match[0].length);
                        if (tail) {
                            var parent = node.parentNode;
                            parent.insertBefore(
                                document.createTextNode(tail), node.nextSibling);
                        }
                        breakAfter(node);
                        if (!firstLine) {
                            // Don't leave blank text nodes in the DOM.
                            node.parentNode.removeChild(node);
                        }
                    }
                }
                break;
            }
        }