public object VisitSuperExpr(Super expr)
{
if (currentClass == ClassType.NONE)
{
Program.Error(expr.Keyword, "Can't use 'super' outside of a class.");
}
else if (currentClass != ClassType.SUBCLASS)
{
Program.Error(expr.Keyword, "Can't use 'super' in a class with no superclass.");
}
ResolveLocal(expr, expr.Keyword);
return(null);
}
public object VisitSuperExpr(Super expr)
{
int distance = locals[expr];
LoxClass superclass = (LoxClass)environment.GetAt(distance, "super");
LoxInstance obj = (LoxInstance)environment.GetAt(distance - 1, "this");
LoxFunction method = superclass.FindMethod(expr.Method.Lexeme);
if (method == null)
{
throw new RuntimeError(expr.Method, "Undefined property '" + expr.Method.Lexeme + "'.");
}
return(method.Bind(obj));
}
public string VisitSuperExpr(Super expr)
{
return("super");
}