public LoxFunction Bind(LoxInstance instance)
{
Environment environment = new Environment(closure);
environment.Define("this", instance);
return(new LoxFunction(declaration, environment, isInitializer));
}
public object Call(Interpreter interpreter, List <object> arguments)
{
LoxInstance instance = new LoxInstance(this);
if (methods.ContainsKey("init"))
{
methods["init"].Bind(instance).Call(interpreter, arguments);
}
return(instance);
}
public LoxFunction FindMethod(LoxInstance instance, string name)
{
LoxFunction ret = null;
if (methods.ContainsKey(name))
{
ret = methods[name].Bind(instance);
}
else if (superclass != null)
{
ret = superclass.FindMethod(instance, name);
}
return(ret);
}
public object Visit(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 obj = (LoxInstance)environment.GetAt(distance - 1, "this");
LoxFunction method = superclass.FindMethod(obj, expr.method.lexeme);
if (method == null)
{
throw new RuntimeError(expr.method, "Undefined property '" + expr.method.lexeme + ".");
}
return(method);
}