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From "Michael McCallum" <>
Subject RE: if and unless attributes for all Tasks
Date Wed, 16 May 2001 22:35:09 GMT
Why not use the script task?

On 16 May 2001, at 14:36, wrote:

> Hi All,
> Roger Vaughn and I have been discussing XML as a flow control language and
> I've come up with a compromise that I'm considering taking a stab at
> writing.  I want to bounce the idea off all of you before I invest a pile
> of time into an idea that one of you might be able to easily debunk.
> I feel that XML is a very poor language for describing conditionals.  All
> the arguments seem to show that.  I suggest a new task called 'code' that
> would work something like this:
>  <target name="make">
>    <code>
>          if(true){
>            callTarget("compile");
>          }
>    </code>
>  </target>
> My task would then take all of the Java between the code tags, put it into
> a file, compile it, load the class then call the task just
> like any other.  Basically, the code tag is just a scriptlet in the
> build.xml.
> To my thinking this has the following advantages:
>      - It doesn't break the current design and architecture
>      - It takes advantage of the fact that we already have a very nice
> language and compiler,
>           we should not have to build another one
>      - Because tasks in this context tend to be one-off, non-reusable bits
> of code, it is
>           really nice to keep the task code in the same file as the rest of
> the build.
>      - The java in the code block could call the other tasks, but still
> have all of the
>           flexibility of Java
> My most optimistic hope is that I can write this into a regular task, and
> ANT itself would not have to change at all.
> Can any of you think of a reason this wouldn't work?  If not, I'm going to
> try coding it next week and I've got some scraps of free time coming.
> Let me know what you think, and thank's to Roger for the discussion about
> it.
>                                                         Jason Henriksen
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