public static ICollection <string> CanonicalizeLocaleList(EcmaValue locales)
{
if (locales == default)
{
return(new List <string>());
}
if (locales.Type == EcmaValueType.String)
{
string s = locales.ToString();
if (!IsStructurallyValidLanguageTag(s))
{
throw new EcmaRangeErrorException("Invalid language tag: {0}", s);
}
return(new List <string> {
CanonicalizeLanguageTag(s)
});
}
HashSet <string> list = new HashSet <string>();
RuntimeObject obj = locales.ToObject();
if (obj is Locale locale)
{
return(new List <string> {
locale.LocaleString
});
}
long len = obj[WellKnownProperty.Length].ToLength();
for (long i = 0; i < len; i++)
{
if (obj.HasProperty(i))
{
list.Add(CanonicalizeLanguageTag(obj[i]));
}
}
return(list);
}