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)
  lambda do |corrector|
    swap_range(corrector, current_range, previous_range)
  end
end

def declaration_with_comment(node)
  buffer = processed_source.buffer
  begin_pos = get_source_range(node, comments_as_separators).begin_pos
  end_line = buffer.line_for_position(node.loc.expression.end_pos)
  end_pos = buffer.line_range(end_line).end_pos
  Parser::Source::Range.new(buffer, begin_pos, end_pos)
end

def swap_range(corrector, range1, range2)
  src1 = range1.source
  src2 = range2.source
  corrector.replace(range1, src2)
  corrector.replace(range2, src1)
end