A good Ruby parser that doesn't require explicit whitespace?

Question

ruby

Now I'm using treetop 'th, but the need to explicitly specify spaces is annoying.

Advise, please, something as simple, elegant and, here, without "gaps". Speed ​​doesn't care. Purpose - parsing of the YaP. It would be ideal if you do not have to heavily rewrite the existing grammar.

Answer 1

watir-webdriver You
can parse both it and a self-saved copy of the page

Answer 2

reverberate.org/gazelle/ search for it or write a C connection library and can be used from Ruby.
I also found such a miracle - kschiess.github.com/parslet/documentation.html