How to invoke RubyParser on a class?

     I think I've got the basic concept and I got the test case to
work where you can parse "1+1" and then use Ruby2Ruby to get it back
to "1+1." But how do I get RubyParser to parse a class. I tried
handing it method, proc and lambda objects as well as the class
outright and it always throws an error. What do I need to give
RubyParser to get it to parse a defined class or class::method?

     After two days of searching every lead I could find and reading
the code I'm at wits end, maybe I'm missing something really obvious.
I'd really appreciate any advice I could get.