class Sass::Tree::RuleNode

def _to_s(tabs)
  tabs = tabs + self.tabs
  rule_separator = style == :compressed ? ',' : ', '
  line_separator =
    case style
      when :nested, :expanded; "\n"
      when :compressed; ""
      else; " "
    end
  rule_indent = '  ' * (tabs - 1)
  per_rule_indent, total_indent = [:nested, :expanded].include?(style) ? [rule_indent, ''] : ['', rule_indent]
  total_rule = total_indent + resolved_rules.members.
    map {|seq| seq.to_a.join}.
    join(rule_separator).split("\n").map do |line|
    per_rule_indent + line.strip
  end.join(line_separator)
  to_return = ''
  old_spaces = '  ' * (tabs - 1)
  spaces = '  ' * tabs
  if style != :compressed
    if @options[:debug_info]
      to_return << debug_info_rule.to_s(tabs) << "\n"
    elsif @options[:line_comments]
      to_return << "#{old_spaces}/* line #{line}"
      if filename
        relative_filename = if @options[:css_filename]
          begin
            Pathname.new(filename).relative_path_from(
              Pathname.new(File.dirname(@options[:css_filename]))).to_s
          rescue ArgumentError
            nil
          end
        end
        relative_filename ||= filename
        to_return << ", #{relative_filename}"
      end
      to_return << " */\n"
    end
  end
  if style == :compact
    properties = children.map { |a| a.to_s(1) }.join(' ')
    to_return << "#{total_rule} { #{properties} }#{"\n" if group_end}"
  elsif style == :compressed
    properties = children.map { |a| a.to_s(1) }.join(';')
    to_return << "#{total_rule}{#{properties}}"
  else
    properties = children.map { |a| a.to_s(tabs + 1) }.join("\n")
    end_props = (style == :expanded ? "\n" + old_spaces : ' ')
    to_return << "#{total_rule} {\n#{properties}#{end_props}}#{"\n" if group_end}"
  end
  to_return
end