Add addons

Sprout/addons/beehave/blackboard.gd

@@ -0,0 +1,27 @@
+## The blackboard is an object that can be used to store and access data between
+## multiple nodes of the behaviour tree.
+class_name Blackboard extends RefCounted
+
+var blackboard: Dictionary = {}
+
+
+func set_value(key: Variant, value: Variant, blackboard_name: String = 'default') -> void:
+	if not blackboard.has(blackboard_name):
+		blackboard[blackboard_name] = {}
+
+	blackboard[blackboard_name][key] = value
+
+
+func get_value(key: Variant, default_value: Variant = null, blackboard_name: String = 'default') -> Variant:
+	if has_value(key, blackboard_name):
+		return blackboard[blackboard_name].get(key, default_value)
+	return default_value
+
+
+func has_value(key: Variant, blackboard_name: String = 'default') -> bool:
+	return blackboard.has(blackboard_name) and blackboard[blackboard_name].has(key) and blackboard[blackboard_name][key] != null
+
+
+func erase_value(key: Variant, blackboard_name: String = 'default') -> void:
+	if blackboard.has(blackboard_name):
+		blackboard[blackboard_name][key] = null