func getSassNumberUnit(arg SassValue) (string, error) {
u := libs.Unit(arg.Val())
var err error
if noSassNumberUnit(arg) {
return u, ErrSassNumberNoUnit
}
if _, ok := libs.SassUnitConversions[u]; !ok {
return u, fmt.Errorf("SassNumber units %s are unsupported", u)
}
return u, err
}
func noSassNumberUnit(arg SassValue) bool {
u := libs.Unit(arg.Val())
return u == "" || u == "none"
}