class RuboCop::Cop::Style::EmptyLines

def autocorrect(range)
  ->(corrector) { corrector.remove(range) }
end

def investigate(processed_source)
  return if processed_source.tokens.empty?
  lines = Set.new
  processed_source.tokens.each do |token|
    lines << token.pos.line
  end
  prev_line = 1
  lines.sort.each do |cur_line|
    line_diff = cur_line - prev_line
    if line_diff > LINE_OFFSET
      # we need to be wary of comments since they
      # don't show up in the tokens
      ((prev_line + 1)...cur_line).each do |line|
        # we check if the prev and current lines are empty
        next unless processed_source[line - 2].empty? &&
                    processed_source[line - 1].empty?
        range = source_range(processed_source.buffer, line, 0)
        add_offense(range, range)
      end
    end
    prev_line = cur_line
  end
end