Added state machine

game/state_machine/abstract_state.gd

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+class_name AbstractState
+extends Node
+
+
+@warning_ignore("unused_signal")
+signal switch_state(state: AbstractState)
+
+
+func init() -> void:
+	pass
+
+
+func enter() -> void:
+	pass
+
+
+func exit() -> void:
+	pass
+
+
+@warning_ignore("unused_parameter")
+func process(delta: float) -> void:
+	pass
+
+
+@warning_ignore("unused_parameter")
+func physics_process(delta: float) -> void:
+	pass

game/state_machine/abstract_state.gd.uid

@@ -0,0 +1 @@
+uid://ofqdyeqbeg4i

game/state_machine/abstract_state.tscn

@@ -0,0 +1,6 @@
+[gd_scene format=3 uid="uid://cxdirjlkyccs4"]
+
+[ext_resource type="Script" uid="uid://ofqdyeqbeg4i" path="res://game/state_machine/abstract_state.gd" id="1_80326"]
+
+[node name="AbstractState" type="Node" unique_id=836520368]
+script = ExtResource("1_80326")

game/state_machine/state_machine.gd

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+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)
+	

game/state_machine/state_machine.gd.uid

@@ -0,0 +1 @@
+uid://cwd731cnbgann

game/state_machine/state_machine.tscn

@@ -0,0 +1,6 @@
+[gd_scene format=3 uid="uid://blxgfix54dxq3"]
+
+[ext_resource type="Script" uid="uid://cwd731cnbgann" path="res://game/state_machine/state_machine.gd" id="1_ncw1q"]
+
+[node name="StateMachine" type="Node" unique_id=560273456]
+script = ExtResource("1_ncw1q")