import the woofer

addons/godot_state_charts/expression_guard.gd

@@ -0,0 +1,39 @@
+@tool
+@icon("expression_guard.svg")
+class_name ExpressionGuard
+extends Guard
+
+const ExpressionUtil = preload("expression_util.gd")
+const DebugUtil = preload("debug_util.gd")
+
+var expression:String = ""
+
+
+func is_satisfied(context_transition:Transition, context_state:StateChartState) -> bool:
+	var root:StateChart = context_state._chart
+
+	if not is_instance_valid(root):
+		push_error("Could not find root state chart node, cannot evaluate expression")
+		return false
+
+	var result:Variant = ExpressionUtil.evaluate_expression("guard in " + DebugUtil.path_of(context_transition), root, expression, false)
+
+	if typeof(result) != TYPE_BOOL:
+		push_error("Expression: ", expression ," result: ", result,  " is not a boolean. Returning false.")
+		return false
+
+	return result
+
+func get_supported_trigger_types() -> int:
+	return StateChart.TriggerType.PROPERTY_CHANGE
+
+func _get_property_list() -> Array[Dictionary]:
+	var properties:Array[Dictionary] = []
+	properties.append({
+		"name": "expression",
+		"type": TYPE_STRING,
+		"usage": PROPERTY_USAGE_DEFAULT,
+		"hint": PROPERTY_HINT_EXPRESSION
+	})
+
+	return properties