public BasilFunction Bind(BasilInstance instance)
{
Environment environment = new Environment(closure);
environment.Define("this", instance);
return(new BasilFunction(declaration, environment, isInitializer));
}
public object Call(Interpreter interpreter, List <object> arguments)
{
BasilInstance instance = new BasilInstance(this);
if (methods.TryGetValue("init", out BasilFunction initializer))
{
initializer.Bind(instance).Call(interpreter, arguments);
}
return(instance);
}
public BasilFunction FindMethod(BasilInstance instance, string name)
{
if (methods.ContainsKey(name))
{
return(methods[name].Bind(instance));
}
if (superclass != null)
{
return(superclass.FindMethod(instance, name));
}
return(null);
}
public object VisitSuperExpr(Expr.Super expr)
{
int distance = locals[expr];
BasilClass superclass = (BasilClass)environment.GetAt(distance, "super");
// "this" is always one level nearer than "super"'s environment.
BasilInstance objekt = (BasilInstance)environment.GetAt(distance - 1, "this");
BasilFunction method = superclass.FindMethod(objekt, expr.Method.lexeme);
if (method == null)
{
throw new RuntimeError(expr.Method, $"Undefined property '{expr.Method.lexeme}'.");
}
return(method);
}
