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From "James Huang" <>
Subject Re: AW: [Ann] Ant task for the JudoScript language
Date Sat, 07 Aug 2004 16:18:51 GMT
I wonder if Ant can somehow preserve the "lang" namespace, so that one can 

<lang:judo .... >

<lang:bsh ... />

and each language extension is completely language-engine-specific via the 
antlib mechanism. I'm sure all language authors would love to support.

In <project>, perhaps something like this:

<project xmlns:lang="antlib:com/judoscript, antlib:bsh, ..." />

Of course, this is kinda non-standard for defining xmlns, and I believe 
there must be a better way to syntacitcally define this. And chances are, 
most probably one language will be used for a whole build script.

My two cents.


>From: Peter Reilly <>
>Reply-To: "Ant Users List" <>
>To: Ant Users List <>
>Subject: Re: AW: [Ann] Ant task for the JudoScript language
>Date: Fri, 06 Aug 2004 18:52:55 +0100
>Hi James,
>The issue is not how easy it is to add a judoscript task, it is more a 
>of support. If we added this task, we should also do the same for the other
>java scripting languages - beanshell, groovy, javascript, jython, pnuts, 
>ruby and jacl to
>name a few.
>The policy now is to try to reduce the number of new tasks in ant to core 
>and allow easier intergration of third party tasks using antlibs.
>For judoscript this can be achieved by adding the following antlib.xml to 
>com/judoscript in
>the judoscript.jar file
>  <taskdef name="judoscript"
>           classname="com.judoscript.AntJudoScriptTask"/>
>and use it as follows:
><project default="judoscript" xmlns:j="antlib:com.judoscript">
>  <target name="judoscript">
>    <property name="x" value="This is x"/>
>    <j:judoscript>
>      println "Hello x value is ${x}";
>    </j:judoscript>
>  </target>
>This is the way I use the tasks from ant-contrib - which I use in nearly 
>all my build
>More examples of languages than javascript need to be added to the <script> 
><scriptdef> pages to show people that ant does support them.
>As regards the default language for script one can use a <presetdef> to do 
><presetdef name="judoscript">
>  <script language="judoscript"/>
>    println "Hello x value is ${x}";
>Of course this does not solve the params issue or the properties issue you 
>James Huang wrote:
>>Hi, Jan and Peter,
>>Thanks for the responses. Yes I am aware of BSF listing of JudoScript and 
>>the related references in Ant literature. But in using Ant, I found 
>><script> has certain deficiencies, which could be, indeed, those of BSF.
>>The <script> does not take a "params" attribute as <judoscript> does.

>>External scripts would likely take parameters and this seems much needed. 
>>(I need to check if BSF supports that.)
>>When a buildscript uses a scripting language, most likely a single 
>>language will be used. Perhaps you can add something like:
>><script *default_language*="judoscript" />
>>So that the subsequent <script> tags need not to have 
>>language="judoscript" every single time.
>>Now, suppose <script> does have the "params" attribute as I wish, if I can 
>>alias a <script language="judoscript" .../> into a <judoscript .../>,

>>that'd be nice, too. I see that the new <scriptdef> tag looks like that; 
>>perhaps a few more examples may help. But that still requires BSF, an 
>>unnecessary dependency and overhead compared to native language support 
>>like <judoscript>.
>>The biggest problem, however, is the way to pass values through 
>>properties; I used 1.5.4. Ant project internally maintains its own 
>>properties, rather than sharing with the System Properties. I don't see a 
>>need for this but that's the way Ant works now. My JudoScript scripts use 
>>system properties, and they can be run within _and_ outside Ant, so I'm 
>>not motivated to write a duplicate piece of code in the scripts just for 
>>that. To support this, in the com.judoscript.AntJudoScriptTask class, I 
>>have to transfer properties values in and out of Ant from/to system 
>>properties. That makes me itchy, thinking about the performance overhead.
>>So, I created AntJudoScriptTask and <taskdef> it to <judoscript>. I have

>>many complicated build activities, e.g., to generate all the articles, 
>>ref, examples in HTML; automated testing including output comparison, JDBC 
>>scripting testing that requires scripts being run in a certain order, 
>>create various shippable packages, ... Like I said, JudoScript's mission 
>>and focus are for practical uses, and is particularly suited for software 
>>building and testing.
>>I hope that people, especially the Ant team members, discover more about 
>>what JudoScript can do in build process, and make <judoscript> an optional 
>>Ant task. As we all know, Ant is not just for building software, it can 
>>automate any processes; having a direct support for <judoscript> can 
>>certainly help many people and provoke the inner drive to use Ant more. 
>>Not everyone is into make files or build.xml; but once they discover it, 
>>things can quickly change. I will certainly put a lot of literature out 
>>there and this won't hurt. Effort of adding <judoscript> is minimal, and I 
>>don't see a reason not to. Please spare some more thoughts on this, 
>>Best regards,
>>>From: Peter Reilly <>
>>>Reply-To: "Ant Users List" <>
>>>To: Ant Users List <>
>>>Subject: Re: AW: [Ann] Ant task for the JudoScript language
>>>Date: Fri, 06 Aug 2004 09:43:52 +0100
>>> wrote:
>>>>Ok, I´ll add that to the external page.
>>>>But I would refuse the introducing as new optional task. For supporting
>>>>scripting languages inside buildscripts, the <script*> family is the

>>>>choice. But if you could modify your code that another 
>>>>is supported, open a bug.
>>>>I never tried JudoScript - maybe you´ll should try a  <script 
>>>>      your code
>>>>  </script>
>>>>before working ...
>>>>Maybe Peter, our great script-expert, knows more ;-)
>>>Judoscript is already supported by the file in  
>>>bsf.jar so the following
>>>works in ant:
>>>  <script language="judoscript">
>>>      println "Hello world";
>>>  </script>
>>>>>-----Ursprüngliche Nachricht-----
>>>>>Von: James Huang []
>>>>>Gesendet am: Freitag, 6. August 2004 08:26
>>>>>Betreff: [Ann] Ant task for the JudoScript language
>>>>>Hi, Ant users and development team,
>>>>>I have created a <judoscript> task and am hereby submitting it to
>>>>>added to the Ant task list per the instructions on the Ant web site. 
>>>>>The following is the information to be added to the external.xml found

>>>>>on Ant's web site:
>>To unsubscribe, e-mail:
>>For additional commands, e-mail:
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