# File lib/compass/sass_extensions/functions/selectors.rb, line 48
  def headers(from = nil, to = nil)
    if from && !to
      if from.is_a?(Sass::Script::String) && from.value == "all"
        from = Sass::Script::Number.new(1)
        to = Sass::Script::Number.new(6)
      else
        to = from
        from = Sass::Script::Number.new(1)
      end
    else
      from ||= Sass::Script::Number.new(1)
      to ||= Sass::Script::Number.new(6)
    end
    Sass::Script::String.new((from.value..to.value).map{|n| "h#{n}"}.join(", "))
  end