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From peter reilly <peter.rei...@corvil.com>
Subject Re: Getting 1.6 out the door
Date Tue, 02 Sep 2003 16:49:13 GMT
On Tuesday 02 September 2003 16:26, Gus Heck wrote:
> >> <macrodef> follows (I think) the same rules of properties as
> >> <antcall> with
> >> inheritall=yes.
>
> Modeling after antcall...? I am wary of this as antcall is broken at the
> top level.
> http://issues.apache.org/bugzilla/show_bug.cgi?id=22759 I certainly
> havn't looked at macrodef closely enough to know if it will be subject
> to the same problem, but it makes me wonder. It might even be the case
> that antcall should be deprecated and replaced with macrodef if macrodef
> works at the top level and can truely duplicate antcall's functionality.

I meant that on reading DD's e-mail, I realized that the property
expansion was the same as for using antcall.

The <macrodef> code is totally different to <antcall>, and <macrodef> is
not
meant to duplicate antcall's functionality - except for the case where
antcall is used as a template. (My build files had a number of such
targets).

However <macrodef> does allow recursive calling so doing:

<macrodef name="bad.recursive">
  <sequential>
      <bad.recursive/>
  </sequential>
</macrodef>

will cause an stack overflow if called.

One can do:

<project default="recursive" xmlns:ac="antlib:net.sf.antcontrib">

  <macrodef name="recursive">
    <attribute name="t"/>
    <sequential>
      <echo>Testing [${t}]</echo>
      <ac:if>
        <equals arg1="${t}" arg2=""/>
        <then>
          <echo>DONE!</echo>
        </then>
        <else>
          <ac:propertyregex property="x" input="${t}"
                            regexp="(.*).$" replace="\1"/>
          <recursive t="${x}"/>
        </else>
      </ac:if>
    </sequential>
  </macrodef>

  <target name="recursive">
    <recursive t="hello world"/>
  </target>

</project>

Giving the result:
recursive:
     [echo] Testing [hello world]
     [echo] Testing [hello worl]
     [echo] Testing [hello wor]
     [echo] Testing [hello wo]
     [echo] Testing [hello w]
     [echo] Testing [hello ]
     [echo] Testing [hello]
     [echo] Testing [hell]
     [echo] Testing [hel]
     [echo] Testing [he]
     [echo] Testing [h]
     [echo] Testing []
     [echo] DONE!

Peter

Note: I am not saying that one should do the above.., it is just
      the first example that came into my head.



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