* Finds nodes in the tree that matches single selector.
*/
protected void walk(Node rootNode, CssSelector cssSelector, List<Node> result) {
// previous combinator determines the behavior
CssSelector previousCssSelector = cssSelector.getPrevCssSelector();
Combinator combinator = previousCssSelector != null ?
previousCssSelector.getCombinator() :
Combinator.DESCENDANT;
switch (combinator) {
case DESCENDANT:
JoddArrayList<Node> nodes = new JoddArrayList<Node>();