57 lines
1.5 KiB
GDScript
57 lines
1.5 KiB
GDScript
@tool
|
|
@icon("expression_guard.svg")
|
|
class_name ExpressionGuard
|
|
extends Guard
|
|
|
|
var expression:String = ""
|
|
|
|
|
|
func is_satisfied(context_transition:Transition, context_state:State) -> bool:
|
|
# walk up the tree to find the root state chart node
|
|
var root = context_state
|
|
|
|
while is_instance_valid(root) and not root is StateChart:
|
|
root = root.get_parent()
|
|
|
|
if not is_instance_valid(root):
|
|
push_error("Could not find root state chart node, cannot evaluate expression")
|
|
return false
|
|
|
|
var the_expression := Expression.new()
|
|
var input_names = root._expression_properties.keys()
|
|
|
|
var parse_result = the_expression.parse(expression, input_names)
|
|
|
|
if parse_result != OK:
|
|
push_error("Expression parse error: " + the_expression.get_error_text() + " for expression " + expression)
|
|
return false
|
|
|
|
# input values need to be in the same order as the input names, so we build an array
|
|
# of values
|
|
var input_values = []
|
|
for input_name in input_names:
|
|
input_values.append(root._expression_properties[input_name])
|
|
|
|
var result = the_expression.execute(input_values)
|
|
if the_expression.has_execute_failed():
|
|
push_error("Expression execute error: " + the_expression.get_error_text() + " for expression: " + expression)
|
|
return false
|
|
|
|
if typeof(result) != TYPE_BOOL:
|
|
push_error("Expression result is not a boolean. Returning false.")
|
|
return false
|
|
|
|
return result
|
|
|
|
|
|
func _get_property_list():
|
|
var properties = []
|
|
properties.append({
|
|
"name": "expression",
|
|
"type": TYPE_STRING,
|
|
"usage": PROPERTY_USAGE_DEFAULT,
|
|
"hint": PROPERTY_HINT_EXPRESSION
|
|
})
|
|
|
|
return properties
|