namespace AspClassic.Scripting.Runtime;

internal abstract class BaseSymbolDictionary
{
	private const int ObjectKeysId = -2;

	private static readonly object _nullObject = new object();

	internal static readonly SymbolId ObjectKeys = new SymbolId(-2);

	public static object NullToObj(object o)
	{
		if (o == null)
		{
			return _nullObject;
		}
		return o;
	}

	public static object ObjToNull(object o)
	{
		if (o == _nullObject)
		{
			return null;
		}
		return o;
	}

	public static bool IsNullObject(object o)
	{
		return o == _nullObject;
	}
}