Added state machine

game/state_machine/state_machine.gd

@@ -0,0 +1,43 @@
+class_name StateMachine
+extends Node
+
+
+@export var initial_state: AbstractState
+
+
+var current_state : AbstractState
+
+
+func init() -> void:
+	_init_states()
+	if initial_state:
+		_change_state(initial_state)
+
+
+func process(delta: float) -> void:
+	if current_state:
+		current_state.process(delta)
+
+
+func physics_process(delta: float) -> void:
+	if current_state:
+		current_state.physics_process(delta)
+
+
+func _change_state(new_state: AbstractState) -> void:
+	if new_state == null: return
+	if new_state == current_state: return
+	
+	if current_state:
+		current_state.exit()
+	current_state = new_state
+	current_state.enter()
+
+
+func _init_states() -> void:
+	for child in get_children():
+		if not child is AbstractState: continue
+		var state := child as AbstractState
+		state.init()
+		state.switch_state.connect(_change_state)
+