class RuboCop::Cop::Style::CaseIndentation

def autocorrect(node)
  when_column = node.location.keyword.column
  source_buffer = node.source_range.source_buffer
  begin_pos = node.loc.keyword.begin_pos
  whitespace = Parser::Source::Range.new(source_buffer,
                                         begin_pos - when_column,
                                         begin_pos)
  return false unless whitespace.source.strip.empty?
  case_node = node.each_ancestor(:case).first
  base_type = cop_config[parameter_name] == 'end' ? :end : :case
  column = base_column(case_node, base_type)
  column += configured_indentation_width if cop_config['IndentOneStep']
  ->(corrector) { corrector.replace(whitespace, ' ' * column) }
end