[TYPO3-core] RFC: eval API (#1639)

[Ingmar Schlecht]

Hi guys,

I've just pretty much rewritten the evalAPI code.

The patch is now much shorter, existing evaluations stay in the core, 
and the place to register own evaluations is now 
$TYPO3_CONF_VARS['SC_OPTIONS']['tce']['formevals'].

I chose 'tce' instead of 't3lib/class.t3lib_tceforms.php' as the second 
level key because the evaluations are used in both tceforms and tcemain.

The patch should be pretty much non-destructive because it only does 
something when evaluation names starting with "tx_" are called, so it 
doesn't change the way the original evaluations are handled.

It has been tested and confirmed to be working by Thomas Hempel.

I would like to commit this patch before RC1 is released on January 24.

cheers,
Ingmar


Sebastian Kurfuerst wrote:
> This is a CVS patch request.
> 
> Type: (Bugfix / New feature / Code cleanup)
> => New feature
> 
> Description:
> see http://bugs.typo3.org/view.php?id=1639
> Sometimes it would be useful to add special evaluations to be used in
> TCEforms. As an example, if the user needs a special date evaluation in
> the BE, he currently has to XCLASS the evaluations and add some custom
> JS. To make this more clean, an eval API would be nice.
> 
> Solution:
>       * currently, the JS part and the PHP part of an evaluation are
>         located in different places => difficult to maintain
>       * all built-in evaluations removed from the core and put into a
>         sysext "evaluations".
>       * new evaluations need to be added to $TYPO3_CONF_VARS['EVAL']
>       * every evaluation has a JS part and a (possible) PHP part, as
>         usual
> 
> Possible issues:
>       * the evaluations sysext is not installed by default I think, how
>         can we install it automatically on update? Maybe with the update
>         wizard?
>       * $TYPO3_CONF_VARS['EVAL'] is maybe not the right place for
>         evaluations. Suggestions?
> 
> Branches: (HEAD / TYPO3_3-8 / TYPO3_3-7)
> => HEAD
> 
> Bugtracker reference:
> => http://bugs.typo3.org/view.php?id=1639
> 
> Files:
> .patch - core patch
> _evaluations.t3x - sysext implementing the current evaluations
> _example_evaluations.t3x - example extension for a custom evaluation
> 
> The documentation is still missing, but this will be created as well.
> 
> Thanks to Thomas Hempel who provided this patch.
> 
> Greets, Sebastian
> 
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