# File lib/rubocop/git/patch.rb, line 12
  def additions
    line_number = 0

    lines.each_with_index.inject([]) do |additions, (content, patch_position)|
      case content
      when RANGE_INFORMATION_LINE
        line_number = Regexp.last_match[:line_number].to_i
      when MODIFIED_LINE
        additions << Line.new(content, line_number, patch_position)
        line_number += 1
      when NOT_REMOVED_LINE
        line_number += 1
      end

      additions
    end
  end