TouhouGD/addons/beehave/nodes/leaves/leaf.gd

## Base class for all leaf nodes of the tree.
@tool
@icon("../../icons/category_leaf.svg")
class_name Leaf extends BeehaveNode


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