ant - 按什么顺序评估Ant目标的 “if”和 “depends”？

Question

也就是说，当testSetupDone评估为false时，将调用以下目标，并在依赖关系链中执行目标吗？

<target name="-runTestsIfTestSetupDone" if="testSetupDone" depends="-runTests" />

Answer 1

是的，将在评估条件之前执行依赖项。

从Ant manual:

Important: the if and unless attributes only enable or disable the target to which they are attached. They do not control whether or not targets that a conditional target depends upon get executed. In fact, they do not even get evaluated until the target is about to be executed, and all its predecessors have already run.

您也可以尝试一下:

<project>
  <target name="-runTests">
    <property name="testSetupDone" value="foo"/>
  </target>
  <target name="runTestsIfTestSetupDone" if="testSetupDone" depends="-runTests">
    <echo>Test</echo>
  </target>
</project>

我在依赖目标中设置属性 testSetupDone，输出为:

Buildfile: build.xml

-runTests:

runTestsIfTestSetupDone:
     [echo] Test

BUILD SUCCESSFUL
Total time: 0 seconds

即使此时未设置 -runTests，也会执行目标 testSetupDone，然后再执行 runTestsIfTestSetupDone，因此在 depend之前(使用Ant 1.7.0)将 评估为。