feat(保存系统): 改进保存数据的序列化和反序列化处理

重构保存系统以使用新的嵌套字典工具方法
修改Starter场景中的按钮文本并隐藏多人游戏选项
添加JsonTool和ArrayTool的嵌套数据操作方法

scripts/Tools/ArrayTool.gd

@@ -53,3 +53,34 @@ static func mergeDictionary(a: Dictionary, b: Dictionary) -> Dictionary:
 	for key in b:
 		result[key] = result.get(key, 0.0) + b[key]
 	return result
+static func getNested(data: Variant, path: String) -> Variant:
+	var keys = path.split(".")
+	var result = data
+	for key in keys:
+		if result is Dictionary:
+			result = result[key]
+		elif result is Array:
+			result = result[key.to_int()]
+		else:
+			return null
+	return result
+static func setNested(data: Variant, path: String, value: Variant):
+	var keys = path.split(".")
+	for i in range(keys.size() - 1):
+		var key = keys[i]
+		if data is Dictionary:
+			data = data[key]
+		elif data is Array:
+			data = data[key.to_int()]
+		else:
+			return
+	var lastKey = keys[-1]
+	if data is Dictionary:
+		data[lastKey] = value
+	elif data is Array:
+		var index = lastKey.to_int()
+		if index == data.size():
+			data.append(value)
+		else:
+			data[index] = value
+	return data

scripts/Tools/Engines/SaveEngine.gd

@@ -3,7 +3,7 @@ class_name SaveEngine
 const SAVE_FILE = "user://save.json"
 
 static func serialize():
-	return {
+	return JsonTool.stringify({
 		"out-game": {
 			"value": OutGameStorage.upgradableFieldsValue,
 			"level": OutGameStorage.upgradableFieldsLevel,
@@ -13,7 +13,7 @@ static func serialize():
 			"tutorial-watched": StarterPanel.tutorialWatched,
 			"selected-character": StarterPanel.selectedCharacter
 		}
-	}
+	})
 static func apply(saveData: Dictionary):
 	OutGameStorage.upgradableFieldsValue = saveData["out-game"]["value"]
 	OutGameStorage.upgradableFieldsLevel = saveData["out-game"]["level"]
@@ -23,12 +23,12 @@ static func apply(saveData: Dictionary):
 static func load():
 	var origin = JsonTool.parseFromFile(SAVE_FILE)
 	if origin is Dictionary:
-		origin["out-game"]["value"] = ArrayTool.mapEntries(origin["out-game"]["value"], func(key, value): return [int(key), value])
-		origin["out-game"]["level"] = ArrayTool.mapEntries(origin["out-game"]["level"], func(key, value): return [int(key), value])
-		origin["out-game"]["inventory"] = ArrayTool.mapEntries(origin["out-game"]["inventory"], func(key, value): return [int(key), value])
+		JsonTool.restoreEnumKey(origin, "out-game.value")
+		JsonTool.restoreEnumKey(origin, "out-game.level")
+		JsonTool.restoreEnumKey(origin, "out-game.inventory")
 		return origin
 static func save():
 	var file = FileAccess.open(SAVE_FILE, FileAccess.ModeFlags.WRITE)
 	if file is FileAccess:
-		file.store_string(JsonTool.stringify(serialize()))
+		file.store_string(serialize())
 		file.close()

scripts/Tools/JsonTool.gd

@@ -12,3 +12,5 @@ static func parseFromText(text: String):
 	return jsonObj.data
 static func stringify(data: Variant):
 	return JSON.stringify(data, "    ")
+static func restoreEnumKey(origin: Dictionary, classpath: String):
+	ArrayTool.setNested(origin, classpath, ArrayTool.mapEntries(ArrayTool.getNested(origin, classpath), func(key, value): return [int(key), value]))