LocalizationFactory.php

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<?php
namespace TYPO3\CMS\Core\Localization;

use TYPO3\CMS\Core\Utility\ArrayUtility;
use TYPO3\CMS\Core\Utility\GeneralUtility;

class LocalizationFactory implements \TYPO3\CMS\Core\SingletonInterface {

    protected $cacheInstance;

    protected $errorMode;

    public $store;

    public function __construct() {
        $this->initialize();
    }

    protected function initialize() {
        $this->store = GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Localization\\LanguageStore');
        $this->initializeCache();
    }

    protected function initializeCache() {
        $this->cacheInstance = GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Cache\\CacheManager')->getCache('l10n');
    }

    public function getParsedData($fileReference, $languageKey, $charset, $errorMode, $isLocalizationOverride = FALSE) {
        $hash = md5($fileReference . $languageKey . $charset);
        $this->errorMode = $errorMode;
        // Check if the default language is processed before processing other language
        if (!$this->store->hasData($fileReference, 'default') && $languageKey !== 'default') {
            $this->getParsedData($fileReference, 'default', $charset, $this->errorMode);
        }
        // If the content is parsed (local cache), use it
        if ($this->store->hasData($fileReference, $languageKey)) {
            return $this->store->getData($fileReference);
        }

        // If the content is in cache (system cache), use it
        $data = $this->cacheInstance->get($hash);
        if ($data !== FALSE) {
            $this->store->setData($fileReference, $languageKey, $data);
            return $this->store->getData($fileReference);
        }

        try {
            $this->store->setConfiguration($fileReference, $languageKey, $charset);
            $parser = $this->store->getParserInstance($fileReference);
            // Get parsed data
            $LOCAL_LANG = $parser->getParsedData($this->store->getAbsoluteFileReference($fileReference), $languageKey, $charset);
        } catch (Exception\FileNotFoundException $exception) {
            // Source localization file not found, set empty data as there could be an override
            $this->store->setData($fileReference, $languageKey, array());
            $LOCAL_LANG = $this->store->getData($fileReference);
        }

        // Override localization
        if (!$isLocalizationOverride && isset($GLOBALS['TYPO3_CONF_VARS']['SYS']['locallangXMLOverride'])) {
            $this->localizationOverride($fileReference, $languageKey, $charset, $errorMode, $LOCAL_LANG);
        }

        // Save parsed data in cache
        $this->store->setData($fileReference, $languageKey, $LOCAL_LANG[$languageKey]);

        // Cache processed data
        $this->cacheInstance->set($hash, $this->store->getDataByLanguage($fileReference, $languageKey));

        return $this->store->getData($fileReference);
    }

    protected function localizationOverride($fileReference, $languageKey, $charset, $errorMode, array &$LOCAL_LANG) {
        $overrides = array();
        $fileReferenceWithoutExtension = $this->store->getFileReferenceWithoutExtension($fileReference);
        $locallangXMLOverride = $GLOBALS['TYPO3_CONF_VARS']['SYS']['locallangXMLOverride'];
        foreach ($this->store->getSupportedExtensions() as $extension) {
            if (isset($locallangXMLOverride[$languageKey][$fileReferenceWithoutExtension . '.' . $extension]) && is_array($locallangXMLOverride[$languageKey][$fileReferenceWithoutExtension . '.' . $extension])) {
                $overrides = array_merge($overrides, $locallangXMLOverride[$languageKey][$fileReferenceWithoutExtension . '.' . $extension]);
            } elseif (isset($locallangXMLOverride[$fileReferenceWithoutExtension . '.' . $extension]) && is_array($locallangXMLOverride[$fileReferenceWithoutExtension . '.' . $extension])) {
                $overrides = array_merge($overrides, $locallangXMLOverride[$fileReferenceWithoutExtension . '.' . $extension]);
            }
        }
        if (count($overrides) > 0) {
            foreach ($overrides as $overrideFile) {
                $languageOverrideFileName = GeneralUtility::getFileAbsFileName($overrideFile);
                ArrayUtility::mergeRecursiveWithOverrule($LOCAL_LANG, $this->getParsedData($languageOverrideFileName, $languageKey, $charset, $errorMode, TRUE));
            }
        }
    }

}