Apache Ant 1.8宏调用嵌套 [英] Apache Ant 1.8 macro invocation nesting

问题描述

几乎可以肯定是重复的，只是将其简化为最基本的形式:

This is almost certainly a duplicate, but just to reduce it to its most basic form:

我想写一对将用作的宏:

I want to write a pair of macros which will be used as:

<defined-environment>
  <task-in-environment>
  <task-in-environment>
  ...
</defined-environment>

..而且理想情况下，我希望能够将宏定义的包含任务任务与普通Ant任务混合使用.

.. and ideally I'd like to be able mix the macro-defined contained tasks tasks with normal Ant tasks.

A，我似乎无法完成这项工作.即使我将< defined-environment>的子包装器设为显式而不是隐式的，我仍会抱怨< task-in-environment>不能作为我要包装的元素的子代.这似乎表明Ant 1.8根本不了解嵌套宏用法的概念.

Alas, I can't seem to make this work. Even if I make the <defined-environment>'s child wrapper explicit rather than implicit, I get complaints that <task-in-environment> is not expected as a child of the element I'm trying to wrap around it. This is behaving as if Ant 1.8 simply does not understand the concept of nested macro usage.

这是真的吗?Ant的宏扩展是否严格地是一次通过且非递归的，我是否真的必须编写新的Ant实现代码来支持这种用法?还是我缺少一些细节，这将使之成为可能?我真的希望现代的宏处理器能够处理此嵌套...

Is that actually true -- is Ant's macro expansion strictly one-pass and nonrecursive, and would I actually have to write new Ant implementation code to support this usage? Or is there some detail I'm missing which will make this possible? I really would expect a modern macro processor to be able to handle this nesting...

(是的，我知道macrosdef可以调用其他宏.这不允许我使用的语法.也不能向< defined-environment>添加参数，因为所包含任务的数量会因一种用法而异. )

(Yes, I know macrosdefs can call other macros. That doesn't allow the syntax I need. Nor does adding parameters to the <defined-environment> since the number of contained tasks will vary from one usage to another.)

附录

好吧，看来人们想要一个明确的例子.这并不是我正在做的事情-我的事情更复杂，这就是为什么我想在宏中隐藏细节-但它具有相同的一般结构并演示了问题...

Ok, looks like folks want an explicit example. This isn't exactly what I'm doing -- mine is more complicated, which is why I want to hide the details in macros -- but it has the same general structure and demonstrates the issue...

<macrodef name="collection">
    <attribute name="id"/>
    <element name="contents" implicit="yes"/>
    <sequential>
          <union id="@{id}">
               <contents/>
          </union>
    </sequential >
 </macrodef>
 <macrodef name="mappedfile">
    <attribute name="fromdir"/>
    <attribute name="todir"/>
    <attribute name="whichfile"/>
    <sequential>
          <mappedresources>
               <globmapper from="*" to="@{todir}/*"/>
                <fileset dir="@{fromdir}" includes="@{whichfile}"/>
          </mappedresources>
    </sequential >
</macrodef>

<collection id="myfiles">
    <mappedfile fromdir="/actual/directory"  whichfile="a.a" todir="/imaginary/directory"/>
    <mappedfile fromdir="/another/directory"  whichfile="b.b" todir="/imaginary/directory"/>
</collection> 

产生一个名为myfiles的资源集合，该资源集合引用来自两个不同目录的文件，但假装它们都来自虚目录.

Produces a resource collection named myfiles which references files from two different directories but pretends they both came from the imaginary directory.

或者应该.据我所知，没有充分的理由不起作用.但是看来Ant 1.8不能解决这个问题，而且我必须编写插件任务定义才能获得我正在寻找的语法抽象.或者使用更智能的xml处理工具作为预处理器.

Or should. As far as I can tell, there is no good reason it shouldn't work. But it does seem that Ant 1.8 can't handle this, and that I'd have to code up plug-in task definitions to get the syntax abstraction I'm looking for. Or use a more intelligent xml processing tool as a preprocessor.

推荐答案

反正找到了我对此版本的解释...

Found the explanation for my version of this, anyway...

宏被定义为创建任务，即使它们扩展到的标签是资源. (固定的措词.请注意，Ant不会抱怨这样的宏体；它们只是行不通.)

Macros in ant are defined as creating tasks, even if the tags they expand to are resources. (Fixed phrasing. Note that Ant doesn't complain about such macro bodies; they just don't work.)

联盟可以将其他资源/资源集合作为子代.不是任务

Union can take other resources/resource collections as children. Not tasks

布拉莫.我什至不需要嵌套的宏调用来阻止我做我想做的事.我根本无法使用内部宏-这是简化我要支持的逻辑中更重要的一个.

Blammo. I don't even need nested macro calls to keep me from doing what I want; I simply can't use the inner macro -- which s the more important one for simplifying the logic I'm trying to support.

你不能从这里到达那里.

Ya can't get there from here.

谢谢，伙计们.

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