public CoxFunction Bind(CoxInstance self)
{
Environment environment = new Environment(Closure);
environment.Define("this", self);
return(new CoxFunction(Declaration, environment, IsInitializer));
}
public Object Call(Interpreter interpreter, List <Object> arguments)
{
CoxInstance instance = new CoxInstance(this);
CoxFunction initializer = Methods["init"];
if (initializer != null)
{
initializer.Bind(instance).Call(interpreter, arguments);
}
return(instance);
}
public CoxFunction FindMethod(CoxInstance instance, String name)
{
CoxClass klass = this;
while (klass != null)
{
if (klass.Methods.ContainsKey(name))
{
return(klass.Methods[name].Bind(instance));
}
klass = klass.Superclass;
}
return(null);
}
public object VisitSuperExpr(Super expr)
{
int distance = Locals[expr];
CoxClass superclass = (CoxClass)Environment.GetAt(distance, "super");
// "this" is always one level nearer than "super"'s environment.
CoxInstance receiver = (CoxInstance)Environment.GetAt(distance - 1, "this");
CoxFunction method = superclass.FindMethod(receiver, expr.Method.Lexeme);
if (method == null)
{
throw new RuntimeError(expr.Method, $"Undefined property '{expr.Method.Lexeme}'.");
}
return(method);
}