add beehave

addons/beehave/nodes/leaves/leaf.gd

@@ -0,0 +1,48 @@
+@tool
+@icon("../../icons/category_leaf.svg")
+class_name Leaf extends BeehaveNode
+
+## Base class for all leaf nodes of the tree.
+
+const EXPRESSION_PLACEHOLDER: String = "Insert an expression..."
+
+
+func _get_configuration_warnings() -> PackedStringArray:
+	var warnings: PackedStringArray = []
+
+	var children: Array[Node] = get_children()
+
+	if children.any(func(x): return x is BeehaveNode):
+		warnings.append("Leaf nodes should not have any child nodes. They won't be ticked.")
+
+	for source in _get_expression_sources():
+		var error_text: String = _parse_expression(source).get_error_text()
+		if not error_text.is_empty():
+			warnings.append("Expression `%s` is invalid! Error text: `%s`" % [source, error_text])
+
+	return warnings
+
+
+func _parse_expression(source: String) -> Expression:
+	var result: Expression = Expression.new()
+	var error: int = result.parse(source)
+
+	if not Engine.is_editor_hint() and error != OK:
+		push_error(
+			(
+				"[Leaf] Couldn't parse expression with source: `%s` Error text: `%s`"
+				% [source, result.get_error_text()]
+			)
+		)
+
+	return result
+
+
+func _get_expression_sources() -> Array[String]:  # virtual
+	return []
+
+
+func get_class_name() -> Array[StringName]:
+	var classes := super()
+	classes.push_back(&"Leaf")
+	return classes