import java.lang.reflect.*;
public abstract class StringWalker extends TreeWalker<String> {
- public Object walk(Tree<String> tree) { return super.walk(tree); }
+ public void walk(String tag) { }
+ public Object walk(Tree<String> tree) {
+ walk(tree.head());
+ return super.walk(tree);
+ }
public Object walk(String tag, Object[] tokens) {
if (tokens.length==0) return tag;
if (tag==null) return null;