public override object Build(CodeContext context, object[] args)
{
object arg = args[Index];
if (arg == null)
{
throw RuntimeHelpers.SimpleTypeError("expected StrongBox, but found null");
}
Type argType = arg.GetType();
if (!argType.IsGenericType || argType.GetGenericTypeDefinition() != typeof(StrongBox <>))
{
throw RuntimeHelpers.SimpleTypeError("expected StrongBox<>");
}
if (argType.GetGenericArguments()[0] != _elementType)
{
throw RuntimeHelpers.SimpleTypeError(String.Format("Expected type {0}, got {1}", typeof(StrongBox <>).MakeGenericType(_elementType).FullName, CompilerHelpers.GetType(arg).FullName));
}
object value = ((IStrongBox)arg).Value;
if (value == null)
{
return(null);
}
return(context.LanguageContext.Binder.Convert(value, _elementType));
}
public static AbstractValue TypeError(string message)
{
throw RuntimeHelpers.SimpleTypeError(message);
//return new AbstractValue(null, Exception, AbstractKind.Error, null);
}