gradle任务方法在build.gradle中的语法

问题描述

我是gradle和groovy的新手，正在阅读Gradle的usr指南，并对任务方法有一些语法问题:

I am new to gradle and groovy,I am reading the usr guide of Gradle, and have some syntax questions on task method:

task intro(dependsOn: hello) {
   doLast { println "I'm Gradle" }
}

问题1:在上面的代码中，Project API中调用了哪种方法?我知道API中有四个重载:

Question 1:in above code, which method is called in Project API ? I know there are four overload in API:

Task task(String name, Closure configureClosure);
Task task(Map<String, ?> args, String name, Closure configureClosure);
Task task(Map<String, ?> args, String name) throws InvalidUserDataException;
Task task(String name) throws InvalidUserDataException;

但是像intro(dependsOn: hello)或copy(type: Copy)这样的参数使我感到困惑，如果加上括号应该是什么?

but the parameter such as intro(dependsOn: hello) or copy(type: Copy) make me confused, what it should be if add parentheses?

问题2:为什么<<是doLast方法的简写?我的意思是Task API中有一个leftshift方法吗?他们之间有什么区别?

Question 2: why << is shorthand for doLast method? I mean there is a leftshift method in Task API ? what is diff between them?

问题3:为什么可以在build.gradle 17.1中使用tasks.create()方法.定义任务，我没有在Project API或AbstractProject源代码中看到tasks属性.

Question 3: why can use tasks.create() method in build.gradle 17.1. Defining tasks,I did not see tasks property in Project API or in AbstractProject source code.

推荐答案

在这种情况下:

task intro(dependsOn: hello) {
   doLast { println "I'm Gradle" }
}

将调用以下方法:

Task task(Map<String, ?> args, String name, Closure configureClosure);

由于gradle使用特定的DSL，因此可能很难分辨，但是:

Since gradle uses a specific DSL it may be hard to tell but:

1. 第一季度

1. Q1

• intro是String name自变量
等同于[dependsOn: hello](a Map)的
• dependsOn: hello是Map<String, ?> args
• { doLast { println "I'm Gradle" } }是Closure configureClosure

• intro is a String name argument
• dependsOn: hello which is equivalent to [dependsOn: hello] (a Map) is Map<String, ?> args
• { doLast { println "I'm Gradle" } } is Closure configureClosure

第二季度

<<是doLast的简写，只是为了使其更简洁.您可以使用doLast，<<，leftShift-都一样. leftShift被覆盖-请参见这里

<< is a shorthand for doLast just to make it more concise. You can use doLast, <<, leftShift - it's all the same. leftShift is overridden - see here

1. 第三季度

除了getTasks之外，没有其他方法tasks，请参见此处.这就是常规的工作原理-如果method是getter，则()和get可以省略，因此project.getTasks()等效于project.tasks.

There's no such method tasks but getTasks, see here. This is how groovy works - if method is a getter () and get can be omitted, so project.getTasks() is equivalent to project.tasks.

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