[TYPO3-core] RFC #10563: Feature: Add Core API function to Extension Management: getEMConfArray()

[Sebastian Gebhard]

This is an SVN patch request.

Type: New feature

Bugtracker references:
http://bugs.typo3.org/bug_view_page.php?bug_id=10563

Branches:
trunk

Problem:
Demand for a API function to get clean EM_CONF array/values

Solution:
This patch introduces a new static function getEMConfArray($extKey, 
$arrKey) to t3lib_extMgm. It cleans up EM_CONF from old style to TER2 
style if needed and returns the hole array or a single value.

Notes:
First paramter of course is the extension key.
Second parameter is optional. If given, the value of this $arrKey in 
EM_CONF will be returned. Accessing nestes values is possible by giving 
an $arrKey like this: 'constraints|depends'.

If extension, em_conf.php or the configuration key is not found NULL 
will be returned.

For cleaning up from old style to TER2 style i refactored 
em_index->fixEMCONF(), em_index->depToString(), em_index->stringToDep() 
and em_index->splitVersionRange() into the new function. It should be 
faster this way.
I avoided to introduce helper functions to t3lib_extMgm to keep it clean.

When this patch is stable em_index should use this new API function.

Regards,

Sebastian Gebhard
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