英文:

A Checkstyle Rule for OpenJDK's Local Variable Type Inference Style Guidelines

问题

# 背景：
OpenJDK发布了一个[样式指南][1]，用于局部变量类型推断。

我在寻找一个内置的checkstyle规则来解决这个问题，但没有找到一个。

我想要的内容非常简单，但我对编写自定义模块不是很熟悉。

# 示例：

### 允许：

- 实例创建，清楚地知道正在创建什么

```java
var something = new Anything(); // 可以

• 这是一个文字，很明显知道它的类型

var something = "literal"; // 可以

违规：

• 即使命名得很好，也不知道类型是什么

var something = anything.doAnything(); // 违规

• 在这里使用var可以提高可读性

Anything<Foo<Bar>> something = new Anything<>(); // 违规

• 不是很重要，但只是为了保持一致性

String something = "literal"; // 违规

问题：

是否有现有的规则可以扩展/调整，以满足上述要求？我应该尝试编写自己的规则吗？我想正则表达式可以处理一些情况，但不能处理所有情况。

<details>
<summary>英文:</summary>

# Background:
OpenJDK have released a [style guide][1] for local variable type inference. 

I was looking for a checkstyle built in rule that addresses it but didn&#39;t found one. 

What I&#39;m trying to get is pretty simple but I&#39;m not that familiar with writing custom Modules. 

# Example:

### Allow:

- instance creation, it&#39;s clear what&#39;s being created 

```java
var something = new Anything(); // OK

• it's a literal, it's obvious what type it has

var something = "literal"; // OK

Violation:

• even with good naming, no clue what's the type

var something = anything.doAnything(); // Violation

• it improves readability to use var here

Anything<Foo<Bar>> something = new Anything<>(); // Violation

• not a big deal but just for consistency

String something = "literal"; // Violation

Question:

Is there any existing rule I can extend / tweak to get the above? Should I try writing my own rule? I assume RegExp can handle some cases but not all.

答案1

得分: 1

这个你可以进行微调：

你可以在这里找到它：https://checkstyle.sourceforge.io/config_coding.html#MatchXpath

注意：MatchXpath 是从 Checkstyle 8.39 版本开始支持的。

英文:

You can tweak this one :

find it here : https://checkstyle.sourceforge.io/config_coding.html#MatchXpath

Note : MatchXpath is Since Checkstyle 8.39