def member_params(params)
      ps = Array(params).map do |p|
        p[:optional] ? "[#{p[:name]}]" : p[:name]
      end.join(", ")

      "( <span class='pre'>#{ps}</span> )"
    end
def member_params(params)
      ps = Array(params).map do |p|
        p[:optional] ? "[#{p[:name]}]" : p[:name]
      end.join(", ")

      "( <span class='pre'>#{ps}</span> )"
    end
Creates HTML listing of parameters.
 When called with nil, creates empty params list.
 A helper method for use in #to_html.