java - 如何将 DSL 语法转换为脚本语法

Question

下面是 groovy DSL 中的代码片段:

plugins {
  id("com.github.johnrengelman.shadow") version "5.2.0"
}

<小时/>

这对我来说很难理解，如果下面是相应的脚本语法:

plugins({
  id(
      {
        "com.github.johnrengelman.shadow", 
        version("5.2.0")
      }
   )
})

<小时/>

如何将 DSL 语法转换为脚本语法？因为脚本化语法对我来说更易读。

Answer 1

plugins 中的 id(String) 方法 block 返回 PluginDependencySpecImpl它具有方法 version(String) 和 apply(boolean)。所以你只需要像这样写:

plugins ({
  id("com.github.johnrengelman.shadow").version("5.2.0")
})

工作中的模式称为 Command Chain .

Groovy lets you omit parentheses around the arguments of a method call for top-level statements. "command chain" feature extends this by allowing us to chain such parentheses-free method calls, requiring neither parentheses around arguments, nor dots between the chained calls. The general idea is that a call like a b c d will actually be equivalent to a(b).c(d). This also works with multiple arguments, closure arguments, and even named arguments.

Haki 先生很好地解释了为什么它有效 here .