LanguageRepository.php

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<?php
namespace TYPO3\CMS\Lang\Domain\Repository;
class LanguageRepository {

    protected $objectManager;

    protected $selectedLanguages = array();

    protected $locales;

    protected $languages = array();

    protected $configurationPath = 'EXTCONF/lang';

    public function __construct() {
        try {
            $globalSettings = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Configuration\\ConfigurationManager')->getLocalConfigurationValueByPath($this->configurationPath);
            $this->selectedLanguages = (array) $globalSettings['availableLanguages'];
        } catch (\Exception $e) {
            \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Configuration\\ConfigurationManager')->setLocalConfigurationValueByPath(
                $this->configurationPath,
                array('availableLanguages' => array())
            );
        }
    }

    public function injectObjectManager(\TYPO3\CMS\Extbase\Object\ObjectManager $objectManager) {
        $this->objectManager = $objectManager;
    }

    public function injectLocales(\TYPO3\CMS\Core\Localization\Locales $locales) {
        $this->locales = $locales;
    }

    public function findAll() {
        if (!count($this->languages)) {
            $languages = $this->locales->getLanguages();
            array_shift($languages);

            foreach ($languages as $locale => $language) {
                $label = htmlspecialchars($GLOBALS['LANG']->sL('LLL:EXT:setup/mod/locallang.xlf:lang_' . $locale));
                if ($label === '') {
                    $label = htmlspecialchars($language);
                }

                $this->languages[$locale] = $this->objectManager->get(
                    'TYPO3\CMS\Lang\Domain\Model\Language',
                    $locale,
                    $label,
                    in_array($locale, $this->selectedLanguages)
                );
            }

            usort($this->languages, function($a, $b) {
                if ($a->getLanguage() == $b->getLanguage()) {
                    return 0;
                }
                return $a->getLanguage() < $b->getLanguage() ? -1 : 1;
            });
        }

        return $this->languages;
    }

    public function findSelected() {
        $languages = $this->findAll();

        $result = array();
        foreach ($languages as $language) {
            if ($language->getSelected()) {
                $result[] = $language;
            }
        }

        return $result;
    }

    public function updateSelectedLanguages($languages) {
            // Add possible dependencies for selected languages
        $dependencies = array();
        foreach ($languages as $language) {
            $dependencies = array_merge($dependencies, $this->locales->getLocaleDependencies($language));
        }
        if (count($dependencies)) {
            $languages = array_unique(array_merge($languages, $dependencies));
        }

        $dir = count($languages) - count($this->selectedLanguages);
        $diff = $dir < 0 ? array_diff($this->selectedLanguages, $languages) : array_diff($languages, $this->selectedLanguages);

        \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Configuration\\ConfigurationManager')->setLocalConfigurationValueByPath(
            $this->configurationPath,
            array('availableLanguages' => $languages)
        );

        return array(
            'success' => count($diff) > 0,
            'dir' => $dir,
            'diff' => array_values($diff),
            'languages' => $languages
        );
    }
}