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

[Sebastian Kurfuerst]

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
-- 
Sebastian Kurfuerst
http://garbage-group.de/kontakt.html
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