add beehave

addons/beehave/nodes/leaves/blackboard_has.gd

@@ -0,0 +1,23 @@
+@tool
+class_name BlackboardHasCondition extends ConditionLeaf
+
+## Returns [code]FAILURE[/code] if expression execution fails or the specified key doesn't exist.
+## Returns [code]SUCCESS[/code] if blackboard has the specified key.
+
+## Expression representing a blackboard key.
+@export_placeholder(EXPRESSION_PLACEHOLDER) var key: String = ""
+
+@onready var _key_expression: Expression = _parse_expression(key)
+
+
+func tick(actor: Node, blackboard: Blackboard) -> int:
+	var key_value: Variant = _key_expression.execute([], blackboard)
+
+	if _key_expression.has_execute_failed():
+		return FAILURE
+
+	return SUCCESS if blackboard.has_value(key_value) else FAILURE
+
+
+func _get_expression_sources() -> Array[String]:
+	return [key]