From 3f01c26719f1e7b9e157dcd89ab3781ec63d3956 Mon Sep 17 00:00:00 2001
From: Serhii Snitsaruk <limbonaut@pm.me>
Date: Wed, 23 Nov 2022 18:02:46 +0100
Subject: [PATCH] Add Blackboard::top()

---
 blackboard.cpp | 9 +++++++++
 blackboard.h   | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/blackboard.cpp b/blackboard.cpp
index 2175687..6f44d9e 100644
--- a/blackboard.cpp
+++ b/blackboard.cpp
@@ -6,6 +6,14 @@
 #include "scene/main/node.h"
 #include <cstddef>
 
+Ref<Blackboard> Blackboard::top() const {
+	Ref<Blackboard> bb(this);
+	while (bb->get_parent_scope().is_valid()) {
+		bb = bb->get_parent_scope();
+	}
+	return bb;
+}
+
 Variant Blackboard::get_var(const Variant &p_key, const Variant &p_default) const {
 	if (data.has(p_key)) {
 		return data.get_valid(p_key);
@@ -46,4 +54,5 @@ void Blackboard::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_parent_scope", "p_blackboard"), &Blackboard::set_parent_scope);
 	ClassDB::bind_method(D_METHOD("get_parent_scope"), &Blackboard::get_parent_scope);
 	ClassDB::bind_method(D_METHOD("prefetch_nodepath_vars", "p_node"), &Blackboard::prefetch_nodepath_vars);
+	ClassDB::bind_method(D_METHOD("top"), &Blackboard::top);
 }
\ No newline at end of file
diff --git a/blackboard.h b/blackboard.h
index fac26d0..4289f94 100644
--- a/blackboard.h
+++ b/blackboard.h
@@ -25,6 +25,8 @@ public:
 	void set_parent_scope(const Ref<Blackboard> &p_blackboard) { parent = p_blackboard; }
 	Ref<Blackboard> get_parent_scope() const { return parent; }
 
+	Ref<Blackboard> top() const;
+
 	Variant get_var(const Variant &p_key, const Variant &p_default) const;
 	void set_var(const Variant &p_key, const Variant &p_value);
 	bool has_var(const Variant &p_key) const;