Using Nashorn for a general-purpose JavaScript AST handler?

[KARR, DAVID]

>From time to time, I've looked at using PMD for various metadata scanners for Java code.  It's very easy to define callbacks for various syntax elements and then gather data from those found elements.  I'm starting to see people looking at doing similar things for JavaScript code.  Is there a straightforward way to use Nashorn to do this kind of thing?