[TYPO3-mvc] Condition in if-ViewHelper quesion

[Christian Zenker]

On Tue, 24 Aug 2010 15:24:26 +0200, Thomas Hempel  
<thomas at typo3-unleashed.net> wrote:

> Hi,
>
> I'm currently trying to understand how the the if-ViewHelper works.  
> Unfortunately I can't find the place where the condition argument is  
> parsed and checked. Can somebody please point me to a direction?

Have a look at Tx_Fluid_Core_Parser_SyntaxTree_ViewHelperNode.

>
> The background for this question is that I pass a negative value to a  
> variable and check that in an condition.

Wow, I thought the built-in was at least able to treat numbers - but  
obvoiusly it is not (see the regexp member variable of the class).
What I would recommend is writing a ViewHelper that returns true or false  
and use it with the inline notation as condition. That should work until  
fluid is updated.

Christian.