public Nothing VisitSuperExpr(Expr.Super expr)
{
if (currentClass == ClassType.None)
{
Lox.Error(expr.Keyword, "Cannot use 'super' outside of a class.");
}
else if (currentClass != ClassType.Subclass)
{
Lox.Error(expr.Keyword, "Cannot use 'super' in a class with no superclass.");
}
ResolveLocal(expr, expr.Keyword);
return(Nothing.AtAll);
}
public object VisitSuperExpr(Expr.Super expr)
{
int distance = locals[expr];
LoxClass superclass = (LoxClass)environment.GetAt(distance, "super");
// "this" is always one level nearer than "super"'s environment.
LoxInstance objekt = (LoxInstance)environment.GetAt(distance - 1, "this");
LoxFunction method = superclass.FindMethod(objekt, expr.Method.Lexeme);
if (method == null)
{
throw new RuntimeError(expr.Method, $"Undefined property '{expr.Method.Lexeme}'.");
}
return(method);
}
public string VisitSuperExpr(Expr.Super expr)
{
throw new System.NotImplementedException();
}