Updated escoria-demo-game

addons/escoria-dialog-simple/patterns/state_machine/state.gd

@@ -0,0 +1,31 @@
+"""
+Base interface for all states: it doesn't do anything in itself
+but forces us to pass the right arguments to the methods below
+and makes sure every State object had all of these methods.
+"""
+extends Node
+
+
+signal finished(next_state_name)
+
+
+# Initialize the state. E.g. change the animation
+func enter():
+	return
+
+
+# Clean up the state. Reinitialize values like a timer
+func exit():
+	return
+
+
+func handle_input(_event):
+	return
+
+
+func update(_delta):
+	return
+
+
+func _on_animation_finished(_anim_name):
+	return

addons/escoria-dialog-simple/patterns/state_machine/state_machine.gd

@@ -0,0 +1,92 @@
+"""
+Base interface for a generic state machine
+It handles initializing, setting the machine active or not
+delegating _physics_process, _input calls to the State nodes,
+and changing the current/active state.
+"""
+extends Node
+
+
+signal state_changed(current_state)
+
+
+"""
+You must set a starting node from the inspector or on
+the node that inherits from this state machine interface
+If you don't the game will crash (on purpose, so you won't
+forget to initialize the state machine)
+"""
+export(NodePath) var START_STATE
+var states_map = {}
+
+var states_stack = []  # can also be used as a pushdown automaton
+var current_state = null
+var current_state_name = ""
+var _active = false setget set_active
+
+
+func initialize(start_state):
+	for child in get_children():
+		child.connect("finished", self, "_change_state")
+
+	set_active(true)
+	states_stack.push_front(start_state)
+	current_state = states_stack[0]
+	current_state.enter()
+
+
+func set_active(value):
+	_active = value
+	set_physics_process(value)
+	set_process_input(value)
+	if not _active:
+		states_stack = []
+		current_state = null
+
+
+func _input(event):
+	current_state.handle_input(event)
+
+
+func _physics_process(delta):
+	current_state.update(delta)
+
+
+func _on_animation_finished(anim_name):
+	if not _active:
+		return
+	current_state._on_animation_finished(anim_name)
+
+
+func _change_state(state_name):
+	if not _active:
+		return
+
+	escoria.logger.trace(
+		self,
+		"Dialog State Machine: Changing state from '%s' to '%s'." % [current_state_name, state_name]
+	)
+
+	current_state.exit()
+
+	if state_name == "previous":
+		states_stack.pop_front()
+	else:
+		states_stack[0] = states_map[state_name]
+
+	current_state = states_stack[0]
+
+	emit_signal("state_changed", current_state)
+
+	#if state_name != "previous":
+	current_state.enter()
+
+	current_state_name = state_name
+
+
+func get_current_state_name():
+	for key in states_map.keys():
+		if states_map[key] == current_state:
+			return key
+
+	return null