class RuboCop::Cop::OrderedGemCorrector

def correct(processed_source, node,
            previous_declaration, comments_as_separators)
  @processed_source = processed_source
  @comments_as_separators = comments_as_separators
  current_range = declaration_with_comment(node)
  previous_range = declaration_with_comment(previous_declaration)
  ->(corrector) { corrector.swap(current_range, previous_range) }
end

def declaration_with_comment(node)
  buffer = processed_source.buffer
  begin_pos = range_by_whole_lines(get_source_range(node, comments_as_separators)).begin_pos
  end_line = buffer.line_for_position(node.source_range.end_pos)
  end_pos = range_by_whole_lines(buffer.line_range(end_line),
                                 include_final_newline: true).end_pos
  range_between(begin_pos, end_pos)
end