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Message-ID: <4CC5D5BC.8020707@maksimo.de>
Date: Mon, 25 Oct 2010 21:08:44 +0200
From: Gilbert Rebhan <gilreb@maksimo.de>
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To: Ant Users List <user@ant.apache.org>
Subject: Re: Number expression in Ant?
References: <AANLkTi=KauUO6ygtkbz3DipbW-uBs7S6MFYvTL1Y3ZYw@mail.gmail.com>
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-------- Original Message  --------
Subject: Number expression in Ant?
From: hezjing <hezjing@gmail.com>
To: ant-users <user@ant.apache.org>
Date: 25.10.2010 04:31

> Hi
> 
> Imagine that I have a property with the value "100", then I want to add 50
> to it and get the result as 150.
> 
> How can I do this in Ant?

Not with vanilla ant. But there are ant addons like for example
antcontrib (development has fallen asleep since 2006) or more lately
ant-flaka.

<project xmlns:fl="antlib:it.haefelinger.flaka">
  <property name="foobar" value="100" />
  <!--  1. overwrite $foobar -->
  <fl:let>foobar ::= '${foobar}' + 50</fl:let>
  <echo>$${foobar} => ${foobar}</echo>
  <!--  declare new property  -->
  <fl:let>foobaz := '${foobar}' + 50 </fl:let>
  <echo>$${foobaz => ${foobaz}</echo>
</project>


....
[echo] ${foobar} => 100
[echo] ${foobar} + 50 => 150
[echo] ${foobaz => 200
....


For ant-flaka details,download,documentation see =
http://code.google.com/p/flaka/


Regards, Gilbert







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