module RuboCop::Cop::Layout::EmptyLinesAroundBody

def check_source(style, line_no, desc)
  case style
  when :no_empty_lines
    check_line(style, line_no, message(MSG_EXTRA, desc), &:empty?)
  when :empty_lines
    check_line(style, line_no, message(MSG_MISSING, desc)) do |line|
      !line.empty?
    end
  end
end