class SassC::Engine

def output_style
  @output_style ||= begin
    style = @options.fetch(:style, :sass_style_nested).to_s.delete_prefix('sass_style_').to_sym
    case style
    when :nested, :compact, :expanded
      :expanded
    when :compressed
      :compressed
    else
      raise InvalidStyleError
    end
  end
end