# File lib/sass/tree/directive_node.rb, line 36
    def _to_s(tabs)
      return value + ";" unless has_children
      return value + " {}" if children.empty?
      result = if style == :compressed
                 "#{value}{"
               else
                 "#{'  ' * (tabs - 1)}#{value} {" + (style == :compact ? ' ' : "\n")
               end
      was_prop = false
      first = true
      children.each do |child|
        next if child.invisible?
        if style == :compact
          if child.is_a?(PropNode)
            result << "#{child.to_s(first || was_prop ? 1 : tabs + 1)} "
          else
            if was_prop
              result[-1] = "\n"
            end
            rendered = child.to_s(tabs + 1).dup
            rendered = rendered.lstrip if first
            result << rendered.rstrip + "\n"
          end
          was_prop = child.is_a?(PropNode)
          first = false
        elsif style == :compressed
          result << (was_prop ? ";#{child.to_s(1)}" : child.to_s(1))
          was_prop = child.is_a?(PropNode)
        else
          result << child.to_s(tabs + 1) + "\n"
        end
      end
      result.rstrip + if style == :compressed
                        "}"
                      else
                        (style == :expanded ? "\n" : " ") + "}\n"
                      end
    end