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