class RDoc::Stats

def undoc_params method
  @formatter ||= RDoc::Markup::ToTtOnly.new
  params = method.param_list
  params = params.map { |param| param.gsub(/^\*\*?/, '') }
  return 0, [] if params.empty?
  document = parse method.comment
  tts = document.accept @formatter
  undoc = params - tts
  [params.length, undoc]
end