minor refactoring
minor refactoring

leafo/scssphp,webdevid/scssphp,leafo/scssphp,kkkyyy03/scssphp,dleffler/scssphp,leafo/scssphp,dleffler/scssphp,g105b/scssphp,g105b/scssphp,dleffler/scssphp,webdevid/scssphp,g105b/scssphp,webdevid/scssphp