public object VisitSuperExpr(Expr.Super expr)
{
int distance;
if (locals.TryGetValue(expr, out distance))
{
LoxClass superclass = (LoxClass)environment.GetAt(distance, "super");
LoxInstance obj = (LoxInstance)environment.GetAt(distance - 1, "this");
LoxFunction method = null;
if (expr.Method != null)
{
method = superclass.FindMethod(expr.Method.Lexeme);
}
else
{
method = superclass.FindMethod(superclass.Name);
}
if (method == null)
{
throw new InterpretingException(expr.Method,
$"Undefined property '{expr.Method.Lexeme}'.");
}
return(method.Bind(obj));
}
return(null);
}
public LoxFunction FindMethod(string name)
{
if (methods.ContainsKey(name))
{
return(methods[name]);
}
if (superclass != null)
{
return(superclass.FindMethod(name));
}
return(null);
}
public object Get(Token name)
{
if (fields.ContainsKey(name.Lexeme))
{
return(fields[name.Lexeme]);
}
var method = loxClass.FindMethod(name.Lexeme);
if (method != null)
{
return(method.Bind(this));
}
throw new InterpretingException(name,
$"Undefined property '{name.Lexeme}'.");
}
