class Sass::Selector::Pseudo

def specificity
  return 1 if type == :element
  return SPECIFICITY_BASE unless selector
  @specificity ||=
    if normalized_name == 'not'
      min = 0
      max = 0
      selector.members.each do |seq|
        spec = seq.specificity
        if spec.is_a?(Range)
          min = Sass::Util.max(spec.begin, min)
          max = Sass::Util.max(spec.end, max)
        else
          min = Sass::Util.max(spec, min)
          max = Sass::Util.max(spec, max)
        end
      end
      min == max ? max : (min..max)
    else
      min = 0
      max = 0
      selector.members.each do |seq|
        spec = seq.specificity
        if spec.is_a?(Range)
          min = Sass::Util.min(spec.begin, min)
          max = Sass::Util.max(spec.end, max)
        else
          min = Sass::Util.min(spec, min)
          max = Sass::Util.max(spec, max)
        end
      end
      min == max ? max : (min..max)
    end
end