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Date: Tue, 15 Apr 2008 10:02:56 +0800
From: Olivier Gies <olivier.gies@bull.net>
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To: Ant Users List <user@ant.apache.org>
Subject: Re: Is recursive property evaluation supported?
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-------- Original Message  --------
Subject: Is recursive property evaluation supported?
From: Shawn Castrianni <Shawn.Castrianni@halliburton.com>
To: 'Ant Users List' <user@ant.apache.org>
Date: 15/04/2008 07:12
> I was trying to present a list of choices for the user like an interactive textual menu.  I produced the list of choices and set a property for each.  The user inputs a number corresponding to the choice he wants, and I get the value corresponding to that choice via my properties I set.  However, it doesn't work because I need to evaluate a recursive property expression:
>
> ${releaseName.${releaseName.selection}}
>
> where  ${releaseName.selection} would evaluate to the number they typed in [1, 2, 3...] and then the outer property would be evaluated like ${releaseName.1} if they picked 1.
>
> Is this supported?  I was able to mix parameter evaluation inside property evaluation and it worked fine:
>
> ${dllName.@{submodule}}<mailto:$%7bdllName.@%7bsubmodule%7d%7d>
>
> So I was surprised my recursive property evaluation didn't work.
>
> Any help presenting a list of choices to the user where they pick the number corresponding to their choice would also be helpful.
>
> ---
> Shawn Castrianni
>
> ----------------------------------------------------------------------
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>   
To my knowledge, this is not supported. The fact that mixed ${ @{ } } 
works, is most likely due to the 2-time processing by the <macrodef> 
first, then by the main Ant property parser.

If you want to achieve the same purpose as a nested ${ ${} }, I suggest 
you use <propertycopy> from ant-contrib, like this:

<propertycopy property="newprop" 
from="releaseName.${releaseName.selection}" />

See ant-contrib documentation for more details.

BR,
Olivier

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