title: Parse ruby code
body: <p>I need help in one problem. I have a table with columns that contain some ruby code, like this: <code>self.org_premium = self.volume / 12 * 0.1492  self.billing_premium = self.subscriber_premium + self.org_premium</code> or <code>employment_level == 'P'</code> or <code>vol_life.save</code>. 
  And now I want find methods in these strings, but some Rails methods, like <code>save</code> or <code>nil?</code> must be ignored.
  I used Ripper, but his method <code>slice</code> return only 1 param.
  Maybe you have some idea about this?</p>