class SassC::Engine

def output_style
  @output_style ||= begin
    style = @options.fetch(:style, :sass_style_nested).to_s
    style = "sass_style_#{style}" unless style.start_with?('sass_style_')
    raise InvalidStyleError unless OUTPUT_STYLES.include?(style.to_sym)
    style = style.delete_prefix('sass_style_').to_sym
    case style
    when :nested, :compact
      :expanded
    else
      style
    end
  end
end