Page TSconfig with conditions in FE - typo3

Question

I'm using TYPO3 v7.6, and trying to overwrite some Page TSconfig with conditions and get it in FE.
What I did is,
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPageTSConfig('<INCLUDE_TYPOSCRIPT: source="FILE:EXT:'.$_EXTKEY.'/Configuration/PageTSconfig/pageTSConfig.txt">');`
in ext_localconf.php in my extension.
In the pageTSConfig.txt
RTE.tinymce {
menu = 0
menubar = 0
plugins = code link lists
statusbar = 0
toolbar {
0 = bold italic | alignleft aligncenter | bullist numlist | undo redo | formatselect | link unlink | code
}
}
[PIDinRootline = 26]
RTE.tinymce {
plugins = code link lists textcolor colorpicker
toolbar {
0 = bold italic | forecolor | alignleft aligncenter | bullist numlist | undo redo | formatselect | link unlink | code
}
}
[end]
The condition works in Page TSconfig in BE. However, $GLOBALS['TSFE']->pagesTSconfig() in FE only gets the default RTE.tinymce, not the overwritten one in page uid=26. Did I miss anything?
BTW, I tried moving the condition part into the Page TSConfig box in page uid=26, and I can get the TSconfig correct with $GLOBALS['TSFE']->pagesTSconfig() in my extension.

Answer 1

A possible way, but may not be a good way.
First, move the condition TSconfig into another file and loaded with
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPageTSConfig('<INCLUDE_TYPOSCRIPT: source="FILE:EXT:'.$_EXTKEY.'/Configuration/PageTSconfig/pageTSConfig2.txt" condition="[PIDinRootline = 26]">');`
See the feature at https://docs.typo3.org/typo3cms/extensions/core/Changelog/7.5/Feature-16525-AddConditionsToINCLUDE_TYPOSCRIPT.html
Then update \TYPO3\CMS\Core\TypoScript\Parser\TypoScriptParser->checkIncludeLines()
/** #var AbstractConditionMatcher $conditionMatcher */
$conditionMatcher = null;
if (TYPO3_REQUESTTYPE & TYPO3_REQUESTTYPE_FE) {
$conditionMatcher = GeneralUtility::makeInstance(FrontendConditionMatcher::class);
} else {
$conditionMatcher = GeneralUtility::makeInstance(BackendConditionMatcher::class);
}
// Make sure we can set the rootLine and pageId
if ($GLOBALS['TSFE']) {
$conditionMatcher->setRootLine($GLOBALS['TSFE']->rootLine);
}
So, [PIDinRootline = 26] would work as expected, and the TSconfig will be loaded accordingly.
The reason for if is, when $conditionMatcher is initialized, no rootLine is set, and ->match() will fail because [treeLevel], [PIDupinRootline] and [PIDinRootline] requires it to work.