TranslationService::translate() - Code Metrics - Inspection of "[TASK] Avoid ObjectManager in ext:form Translation..." - TYPO3/TYPO3.CMS - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( ee8df7...208bf9 )

unknown
created 2021-06-10 19:26 UTC
TranslationService::translate() F

↳ Parent: TranslationService
Complexity

Conditions	19
Paths	480
Size

Total Lines	70
Code Lines	37
Duplication

Lines	0
Ratio	0 %
Importance

Changes
Metric	Value
cc	19
eloc	37
nc	480
nop	5
dl	0
loc	70
rs	1.0722
c	0
b	0
f	0
How to fix Long Method Complexity

<?php

declare(strict_types=1);

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

namespace TYPO3\CMS\Form\Service;

use Psr\Http\Message\ServerRequestInterface;
use TYPO3\CMS\Core\Http\ApplicationType;
use TYPO3\CMS\Core\Localization\LanguageService;
use TYPO3\CMS\Core\Localization\Locales;
use TYPO3\CMS\Core\Localization\LocalizationFactory;
use TYPO3\CMS\Core\SingletonInterface;
use TYPO3\CMS\Core\Site\Entity\SiteLanguage;
use TYPO3\CMS\Core\Utility\ArrayUtility;
use TYPO3\CMS\Core\Utility\Exception\MissingArrayPathException;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Extbase\Configuration\ConfigurationManagerInterface;
use TYPO3\CMS\Form\Domain\Model\FormElements\FormElementInterface;
use TYPO3\CMS\Form\Domain\Model\Renderable\RootRenderableInterface;
use TYPO3\CMS\Form\Domain\Runtime\FormRuntime;

/**
 * Advanced translations
 * This class is subjected to change.
 * **Do NOT subclass**
 *
 * Scope: frontend / backend
 * @internal
 */
class TranslationService implements SingletonInterface
{

    /**
     * Local Language content
     *
     * @var array
     */
    protected $LOCAL_LANG = [];

    /**
     * Contains those LL keys, which have been set to (empty) in TypoScript.
     * This is necessary, as we cannot distinguish between a nonexisting
     * translation and a label that has been cleared by TS.
     * In both cases ['key'][0]['target'] is "".
     *
     * @var array
     */
    protected $LOCAL_LANG_UNSET = [];

    /**
     * Key of the language to use
     *
     * @var string
     */
    protected $languageKey;

    /**
     * Pointer to alternative fall-back language to use
     *
     * @var array
     */
    protected $alternativeLanguageKeys = [];

    protected ConfigurationManagerInterface $configurationManager;

    public function __construct(ConfigurationManagerInterface $configurationManager)
    {
        $this->configurationManager = $configurationManager;
    }

    /**
     * Return TranslationService as singleton
     *
     * @return self
     * @internal
     */
    public static function getInstance(): self
    {
        /** @var self $instance */
        $instance = GeneralUtility::makeInstance(self::class);
        return $instance;
    }

    /**
     * Returns the localized label of the LOCAL_LANG key, $key.
     *
     * @param mixed $key The key from the LOCAL_LANG array for which to return the value.
     * @param array $arguments the arguments of the extension, being passed over to vsprintf
     * @param string $locallangPathAndFilename
     * @param string $language
     * @param mixed $defaultValue
     * @return mixed The value from LOCAL_LANG or $defaultValue if no translation was found.
     * @internal
     */
    public function translate(
        $key,
        array $arguments = null,
        string $locallangPathAndFilename = null,
        string $language = null,
        $defaultValue = ''
    ) {
        $value = null;
        $key = (string)$key;

        if ($locallangPathAndFilename) {
            $key = $locallangPathAndFilename . ':' . $key;
        }

        $keyParts = explode(':', $key);
        if (GeneralUtility::isFirstPartOfStr($key, 'LLL:')) {
            $locallangPathAndFilename = $keyParts[1] . ':' . $keyParts[2];
            $key = $keyParts[3];
        } elseif (GeneralUtility::isFirstPartOfStr($key, 'EXT:')) {
            $locallangPathAndFilename = $keyParts[0] . ':' . $keyParts[1];
            $key = $keyParts[2];
        } else {
            if (count($keyParts) === 2) {
                $locallangPathAndFilename = $keyParts[0];
                $key = $keyParts[1];
            }
        }

        if ($language) {
            $this->languageKey = $language;
        }

        $this->initializeLocalization($locallangPathAndFilename ?? '');

        // The "from" charset of csConv() is only set for strings from TypoScript via _LOCAL_LANG
        if (!empty($this->LOCAL_LANG[$this->languageKey][$key][0]['target'])
            || isset($this->LOCAL_LANG_UNSET[$this->languageKey][$key])
        ) {
            // Local language translation for key exists
            $value = $this->LOCAL_LANG[$this->languageKey][$key][0]['target'];
        } elseif (!empty($this->alternativeLanguageKeys)) {
            $languages = array_reverse($this->alternativeLanguageKeys);
            foreach ($languages as $language) {
                if (!empty($this->LOCAL_LANG[$language][$key][0]['target'])
                    || isset($this->LOCAL_LANG_UNSET[$language][$key])
                ) {
                    // Alternative language translation for key exists
                    $value = $this->LOCAL_LANG[$language][$key][0]['target'];
                    break;
                }
            }
        }

        if ($value === null && (!empty($this->LOCAL_LANG['default'][$key][0]['target'])
            || isset($this->LOCAL_LANG_UNSET['default'][$key]))
        ) {
            // Default language translation for key exists
            // No charset conversion because default is English and thereby ASCII
            $value = $this->LOCAL_LANG['default'][$key][0]['target'];
        }

        if (is_array($arguments) && !empty($arguments) && $value !== null) {
            $value = vsprintf($value, $arguments);
        } else {
            if (empty($value)) {
                $value = $defaultValue;
            }
        }

        return $value;
    }

    /**
     * Recursively translate values.
     *
     * @param array $array
     * @param array $translationFiles
     * @return array the modified array
     * @internal
     */
    public function translateValuesRecursive(array $array, array $translationFiles = []): array
    {
        $result = $array;
        foreach ($result as $key => $value) {
            if (is_array($value)) {
                $result[$key] = $this->translateValuesRecursive($value, $translationFiles);
            } else {
                $this->sortArrayWithIntegerKeysDescending($translationFiles);

                if (!empty($translationFiles)) {
                    foreach ($translationFiles as $translationFile) {
                        $translatedValue = $this->translate($value, null, $translationFile, null);
                        if (!empty($translatedValue)) {
                            $result[$key] = $translatedValue;
                            break;
                        }
                    }
                } else {
                    $result[$key] = $this->translate($value, null, null, null, $value);
                }
            }
        }
        return $result;
    }

    /**
     * @param string $key
     * @param array $arguments
     * @param array $translationFiles
     * @return array the modified array
     * @internal
     */
    public function translateToAllBackendLanguages(
        string $key,
        array $arguments = null,
        array $translationFiles = []
    ): array {
        $result = [];
        $translationFiles = $this->sortArrayWithIntegerKeysDescending($translationFiles);

        foreach ($this->getAllTypo3BackendLanguages() as $language) {
            $result[$language] = $key;
            foreach ($translationFiles as $translationFile) {
                $translatedValue = $this->translate($key, $arguments, $translationFile, $language, $key);
                if ($translatedValue !== $key) {
                    $result[$language] = $translatedValue;
                    break;
                }
            }
        }

        return $result;
    }

    /**
     * @param FormRuntime $formRuntime
     * @param string $finisherIdentifier
     * @param string $optionKey
     * @param string $optionValue
     * @param array $renderingOptions
     * @return string
     * @throws \InvalidArgumentException
     */
    public function translateFinisherOption(
        FormRuntime $formRuntime,
        string $finisherIdentifier,
        string $optionKey,
        string $optionValue,
        array $renderingOptions = []
    ): string {
        if (empty($finisherIdentifier)) {
            throw new \InvalidArgumentException('The argument "finisherIdentifier" is empty', 1476216059);
        }
        if (empty($optionKey)) {
            throw new \InvalidArgumentException('The argument "optionKey" is empty', 1476216060);
        }

        $finisherIdentifier = preg_replace('/Finisher$/', '', $finisherIdentifier);
        $translationFiles = $renderingOptions['translationFiles'] ?? [];
        if (empty($translationFiles)) {
            $translationFiles = $formRuntime->getRenderingOptions()['translation']['translationFiles'];
        }

        $translationFiles = $this->sortArrayWithIntegerKeysDescending($translationFiles);

        if (isset($renderingOptions['translatePropertyValueIfEmpty'])) {
            $translatePropertyValueIfEmpty = (bool)$renderingOptions['translatePropertyValueIfEmpty'];
        } else {
            $translatePropertyValueIfEmpty = true;
        }

        if (empty($optionValue) && !$translatePropertyValueIfEmpty) {
            return $optionValue;
        }

        $language = null;
        if (isset($renderingOptions['language'])) {
            $language = $renderingOptions['language'];
        }

        try {
            $arguments = ArrayUtility::getValueByPath($renderingOptions['arguments'] ?? [], $optionKey, '.');
        } catch (MissingArrayPathException $e) {
            $arguments = [];
        }

        $originalFormIdentifier = null;
        if (isset($formRuntime->getRenderingOptions()['_originalIdentifier'])) {
            $originalFormIdentifier = $formRuntime->getRenderingOptions()['_originalIdentifier'];
        }

        $translationKeyChain = [];
        foreach ($translationFiles as $translationFile) {
            if (!empty($originalFormIdentifier)) {
                $translationKeyChain[] = sprintf('%s:%s.finisher.%s.%s', $translationFile, $originalFormIdentifier, $finisherIdentifier, $optionKey);
            }
            $translationKeyChain[] = sprintf('%s:%s.finisher.%s.%s', $translationFile, $formRuntime->getIdentifier(), $finisherIdentifier, $optionKey);
            $translationKeyChain[] = sprintf('%s:finisher.%s.%s', $translationFile, $finisherIdentifier, $optionKey);
        }

        $translatedValue = $this->processTranslationChain($translationKeyChain, $language, $arguments);
        $translatedValue = empty($translatedValue) ? $optionValue : $translatedValue;

        return $translatedValue;
    }

    /**
     * @param RootRenderableInterface $element
     * @param array $propertyParts
     * @param FormRuntime $formRuntime
     * @return string|array
     * @throws \InvalidArgumentException
     * @internal
     */
    public function translateFormElementValue(
        RootRenderableInterface $element,
        array $propertyParts,
        FormRuntime $formRuntime
    ) {
        if (empty($propertyParts)) {
            throw new \InvalidArgumentException('The argument "propertyParts" is empty', 1476216007);
        }

        $propertyType = 'properties';
        $property = implode('.', $propertyParts);
        $renderingOptions = $element->getRenderingOptions();

        if ($property === 'label') {
            $defaultValue = $element->getLabel();
        } else {
            if ($element instanceof FormElementInterface) {
                try {
                    $defaultValue = ArrayUtility::getValueByPath($element->getProperties(), $propertyParts, '.');
                } catch (MissingArrayPathException $exception) {
                    $defaultValue = null;
                }
            } else {
                $propertyType = 'renderingOptions';
                try {
                    $defaultValue = ArrayUtility::getValueByPath($renderingOptions, $propertyParts, '.');
                } catch (MissingArrayPathException $exception) {
                    $defaultValue = null;
                }
            }
        }

        if (isset($renderingOptions['translation']['translatePropertyValueIfEmpty'])) {
            $translatePropertyValueIfEmpty = $renderingOptions['translation']['translatePropertyValueIfEmpty'];
        } else {
            $translatePropertyValueIfEmpty = true;
        }

        if (empty($defaultValue) && !$translatePropertyValueIfEmpty) {
            return $defaultValue;
        }

        $defaultValue = empty($defaultValue) ? '' : $defaultValue;
        $translationFiles = $renderingOptions['translation']['translationFiles'] ?? [];
        if (empty($translationFiles)) {
            $translationFiles = $formRuntime->getRenderingOptions()['translation']['translationFiles'];
        }

        $translationFiles = $this->sortArrayWithIntegerKeysDescending($translationFiles);

        $language = null;
        if (isset($renderingOptions['translation']['language'])) {
            $language = $renderingOptions['translation']['language'];
        }

        try {
            $arguments = ArrayUtility::getValueByPath($renderingOptions['translation']['arguments'] ?? [], $propertyParts, '.');
        } catch (MissingArrayPathException $e) {
            $arguments = [];
        }

        $originalFormIdentifier = null;
        if (isset($formRuntime->getRenderingOptions()['_originalIdentifier'])) {
            $originalFormIdentifier = $formRuntime->getRenderingOptions()['_originalIdentifier'];
        }

        if ($property === 'options' && is_array($defaultValue)) {
            foreach ($defaultValue as $optionValue => &$optionLabel) {
                $translationKeyChain = [];
                foreach ($translationFiles as $translationFile) {
                    if (!empty($originalFormIdentifier)) {
                        if ($element instanceof FormRuntime) {
                            $translationKeyChain[] = sprintf('%s:%s.element.%s.%s.%s.%s', $translationFile, $originalFormIdentifier, $originalFormIdentifier, $propertyType, $property, $optionValue);
                            $translationKeyChain[] = sprintf('%s:element.%s.%s.%s.%s', $translationFile, $originalFormIdentifier, $propertyType, $property, $optionValue);
                        } else {
                            $translationKeyChain[] = sprintf('%s:%s.element.%s.%s.%s.%s', $translationFile, $originalFormIdentifier, $element->getIdentifier(), $propertyType, $property, $optionValue);
                        }
                    }
                    $translationKeyChain[] = sprintf('%s:%s.element.%s.%s.%s.%s', $translationFile, $formRuntime->getIdentifier(), $element->getIdentifier(), $propertyType, $property, $optionValue);
                    $translationKeyChain[] = sprintf('%s:element.%s.%s.%s.%s', $translationFile, $element->getIdentifier(), $propertyType, $property, $optionValue);
                    $translationKeyChain[] = sprintf('%s:element.%s.%s.%s.%s', $translationFile, $element->getType(), $propertyType, $property, $optionValue);
                }

                $translatedValue = $this->processTranslationChain($translationKeyChain, $language, $arguments);
                $optionLabel = empty($translatedValue) ? $optionLabel : $translatedValue;
            }
            $translatedValue = $defaultValue;
        } elseif ($property === 'fluidAdditionalAttributes' && is_array($defaultValue)) {
            foreach ($defaultValue as $propertyName => &$propertyValue) {
                $translationKeyChain = [];
                foreach ($translationFiles as $translationFile) {
                    if (!empty($originalFormIdentifier)) {
                        if ($element instanceof FormRuntime) {
                            $translationKeyChain[] = sprintf('%s:%s.element.%s.%s.%s', $translationFile, $originalFormIdentifier, $originalFormIdentifier, $propertyType, $propertyName);
                            $translationKeyChain[] = sprintf('%s:element.%s.%s.%s', $translationFile, $originalFormIdentifier, $propertyType, $propertyName);
                        } else {
                            $translationKeyChain[] = sprintf('%s:%s.element.%s.%s.%s', $translationFile, $originalFormIdentifier, $element->getIdentifier(), $propertyType, $propertyName);
                        }
                    }
                    $translationKeyChain[] = sprintf('%s:%s.element.%s.%s.%s', $translationFile, $formRuntime->getIdentifier(), $element->getIdentifier(), $propertyType, $propertyName);
                    $translationKeyChain[] = sprintf('%s:element.%s.%s.%s', $translationFile, $element->getIdentifier(), $propertyType, $propertyName);
                    $translationKeyChain[] = sprintf('%s:element.%s.%s.%s', $translationFile, $element->getType(), $propertyType, $propertyName);
                }

                $translatedValue = $this->processTranslationChain($translationKeyChain, $language, $arguments);
                $propertyValue = empty($translatedValue) ? $propertyValue : $translatedValue;
            }
            $translatedValue = $defaultValue;
        } else {
            $translationKeyChain = [];
            foreach ($translationFiles as $translationFile) {
                if (!empty($originalFormIdentifier)) {
                    if ($element instanceof FormRuntime) {
                        $translationKeyChain[] = sprintf('%s:%s.element.%s.%s.%s', $translationFile, $originalFormIdentifier, $originalFormIdentifier, $propertyType, $property);
                        $translationKeyChain[] = sprintf('%s:element.%s.%s.%s', $translationFile, $originalFormIdentifier, $propertyType, $property);
                    } else {
                        $translationKeyChain[] = sprintf('%s:%s.element.%s.%s.%s', $translationFile, $originalFormIdentifier, $element->getIdentifier(), $propertyType, $property);
                    }
                }
                $translationKeyChain[] = sprintf('%s:%s.element.%s.%s.%s', $translationFile, $formRuntime->getIdentifier(), $element->getIdentifier(), $propertyType, $property);
                $translationKeyChain[] = sprintf('%s:element.%s.%s.%s', $translationFile, $element->getIdentifier(), $propertyType, $property);
                $translationKeyChain[] = sprintf('%s:element.%s.%s.%s', $translationFile, $element->getType(), $propertyType, $property);
            }

            $translatedValue = $this->processTranslationChain($translationKeyChain, $language, $arguments);
            $translatedValue = empty($translatedValue) ? $defaultValue : $translatedValue;
        }

        return $translatedValue;
    }

    /**
     * @param RootRenderableInterface $element
     * @param int $code
     * @param string $defaultValue
     * @param array $arguments
     * @param FormRuntime $formRuntime
     * @return string
     * @throws \InvalidArgumentException
     * @internal
     */
    public function translateFormElementError(
        RootRenderableInterface $element,
        int $code,
        array $arguments,
        string $defaultValue,
        FormRuntime $formRuntime
    ): string {
        if (empty($code)) {
            throw new \InvalidArgumentException('The argument "code" is empty', 1489272978);
        }

        $validationErrors = $element->getProperties()['validationErrorMessages'] ?? null;
        $validationErrors = $element->/** @scrutinizer ignore-call */ getProperties()['validationErrorMessages'] ?? null;
        if (is_array($validationErrors)) {
            foreach ($validationErrors as $validationError) {
                if ((int)$validationError['code'] === $code) {
                    return sprintf($validationError['message'], ...$arguments);
                }
            }
        }

        $renderingOptions = $element->getRenderingOptions();
        $translationFiles = $renderingOptions['translation']['translationFiles'] ?? [];
        if (empty($translationFiles)) {
            $translationFiles = $formRuntime->getRenderingOptions()['translation']['translationFiles'];
        }

        $translationFiles = $this->sortArrayWithIntegerKeysDescending($translationFiles);

        $language = null;
        if (isset($renderingOptions['language'])) {
            $language = $renderingOptions['language'];
        }

        $originalFormIdentifier = null;
        if (isset($formRuntime->getRenderingOptions()['_originalIdentifier'])) {
            $originalFormIdentifier = $formRuntime->getRenderingOptions()['_originalIdentifier'];
        }

        $translationKeyChain = [];
        foreach ($translationFiles as $translationFile) {
            if (!empty($originalFormIdentifier)) {
                if ($element instanceof FormRuntime) {
                    $translationKeyChain[] = sprintf('%s:%s.validation.error.%s.%s', $translationFile, $originalFormIdentifier, $originalFormIdentifier, $code);
                    $translationKeyChain[] = sprintf('%s:validation.error.%s.%s', $translationFile, $originalFormIdentifier, $code);
                } else {
                    $translationKeyChain[] = sprintf('%s:%s.validation.error.%s.%s', $translationFile, $originalFormIdentifier, $element->getIdentifier(), $code);
                }
                $translationKeyChain[] = sprintf('%s:%s.validation.error.%s', $translationFile, $originalFormIdentifier, $code);
            }
            $translationKeyChain[] = sprintf('%s:%s.validation.error.%s.%s', $translationFile, $formRuntime->getIdentifier(), $element->getIdentifier(), $code);
            $translationKeyChain[] = sprintf('%s:%s.validation.error.%s', $translationFile, $formRuntime->getIdentifier(), $code);
            $translationKeyChain[] = sprintf('%s:validation.error.%s.%s', $translationFile, $element->getIdentifier(), $code);
            $translationKeyChain[] = sprintf('%s:validation.error.%s', $translationFile, $code);
        }

        $translatedValue = $this->processTranslationChain($translationKeyChain, $language, $arguments);
        $translatedValue = empty($translatedValue) ? $defaultValue : $translatedValue;
        return $translatedValue;
    }

    /**
     * @param string $languageKey
     * @internal
     */
    public function setLanguage(string $languageKey)
    {
        $this->languageKey = $languageKey;
    }

    /**
     * @return string
     * @internal
     */
    public function getLanguage(): string
    {
        return $this->languageKey;
    }

    /**
     * @param array $translationKeyChain
     * @param string $language
     * @param array $arguments
     * @return string|null
     */
    protected function processTranslationChain(
        array $translationKeyChain,
        string $language = null,
        array $arguments = null
    ) {
        $translatedValue = null;
        foreach ($translationKeyChain as $translationKey) {
            $translatedValue = $this->translate($translationKey, $arguments, null, $language);
            if (!empty($translatedValue)) {
                break;
            }
        }
        return $translatedValue;
    }

    /**
     * @param string $locallangPathAndFilename
     */
    protected function initializeLocalization(string $locallangPathAndFilename)
    {
        if (empty($this->languageKey)) {
            $this->setLanguageKeys();
        }

        if (!empty($locallangPathAndFilename)) {
            /** @var LocalizationFactory $languageFactory */
            $languageFactory = GeneralUtility::makeInstance(LocalizationFactory::class);
            $this->LOCAL_LANG = $languageFactory->getParsedData($locallangPathAndFilename, $this->languageKey);

            foreach ($this->alternativeLanguageKeys as $language) {
                $tempLL = $languageFactory->getParsedData($locallangPathAndFilename, $language);
                if ($this->languageKey !== 'default' && isset($tempLL[$language])) {
                    $this->LOCAL_LANG[$language] = $tempLL[$language];
                }
            }
        }
        $this->loadTypoScriptLabels();
    }

    /**
     * Sets the currently active language keys.
     */
    protected function setLanguageKeys()
    {
        $this->languageKey = 'default';

        $this->alternativeLanguageKeys = [];
        if (($GLOBALS['TYPO3_REQUEST'] ?? null) instanceof ServerRequestInterface
            && ApplicationType::fromRequest($GLOBALS['TYPO3_REQUEST'])->isFrontend()
        ) {
            $this->languageKey = $this->getCurrentSiteLanguage()->getTypo3Language();
            if ($this->languageKey !== 'default') {
                /** @var \TYPO3\CMS\Core\Localization\Locales $locales */
                $locales = GeneralUtility::makeInstance(Locales::class);
                if (in_array($this->languageKey, $locales->getLocales(), true)) {
                    foreach ($locales->getLocaleDependencies($this->languageKey) as $language) {
                        $this->alternativeLanguageKeys[] = $language;
                    }
                }
            }
        } elseif (!empty($GLOBALS['BE_USER']->user['lang'])) {
            $this->languageKey = $GLOBALS['BE_USER']->user['lang'];
        } elseif (!empty($this->getLanguageService()->lang)) {
            $this->languageKey = $this->getLanguageService()->lang;
        }
    }

    /**
     * Overwrites labels that are set via TypoScript.
     * TS locallang labels have to be configured like:
     * plugin.tx_form._LOCAL_LANG.languageKey.key = value
     */
    protected function loadTypoScriptLabels()
    {
        $frameworkConfiguration = $this->configurationManager
            ->getConfiguration(ConfigurationManagerInterface::CONFIGURATION_TYPE_FRAMEWORK, 'form');

        if (!is_array($frameworkConfiguration['_LOCAL_LANG'] ?? null)) {
            return;
        }
        $this->LOCAL_LANG_UNSET = [];
        foreach ($frameworkConfiguration['_LOCAL_LANG'] as $languageKey => $labels) {
            if (!(is_array($labels) && isset($this->LOCAL_LANG[$languageKey]))) {
                continue;
            }
            foreach ($labels as $labelKey => $labelValue) {
                if (is_string($labelValue)) {
                    $this->LOCAL_LANG[$languageKey][$labelKey][0]['target'] = $labelValue;
                    if ($labelValue === '') {
                        $this->LOCAL_LANG_UNSET[$languageKey][$labelKey] = '';
                    }
                } elseif (is_array($labelValue)) {
                    $labelValue = $this->flattenTypoScriptLabelArray($labelValue, $labelKey);
                    foreach ($labelValue as $key => $value) {
                        $this->LOCAL_LANG[$languageKey][$key][0]['target'] = $value;
                        if ($value === '') {
                            $this->LOCAL_LANG_UNSET[$languageKey][$key] = '';
                        }
                    }
                }
            }
        }
    }

    /**
     * Flatten TypoScript label array; converting a hierarchical array into a flat
     * array with the keys separated by dots.
     *
     * Example Input:  array('k1' => array('subkey1' => 'val1'))
     * Example Output: array('k1.subkey1' => 'val1')
     *
     * @param array $labelValues Hierarchical array of labels
     * @param string $parentKey the name of the parent key in the recursion; is only needed for recursion.
     * @return array flattened array of labels.
     */
    protected function flattenTypoScriptLabelArray(array $labelValues, string $parentKey = ''): array
    {
        $result = [];
        foreach ($labelValues as $key => $labelValue) {
            if (!empty($parentKey)) {
                $key = $parentKey . '.' . $key;
            }
            if (is_array($labelValue)) {
                $labelValue = $this->flattenTypoScriptLabelArray($labelValue, $key);
                $result = array_merge($result, $labelValue);
            } else {
                $result[$key] = $labelValue;
            }
        }
        return $result;
    }

    /**
     * If the array contains numerical keys only, sort it in descending order
     *
     * @param array $array
     * @return array
     */
    protected function sortArrayWithIntegerKeysDescending(array $array)
    {
        if (count(array_filter(array_keys($array), 'is_string')) === 0) {
            krsort($array);
        }
        return $array;
    }

    /**
     * Returns the currently configured "site language" if a site is configured (= resolved) in the current request.
     *
     * @return SiteLanguage|null
     */
    protected function getCurrentSiteLanguage(): ?SiteLanguage
    {
        if ($GLOBALS['TYPO3_REQUEST'] instanceof ServerRequestInterface) {
            return $GLOBALS['TYPO3_REQUEST']->getAttribute('language', null);
        }
        return null;
    }

    /**
     * @return array
     */
    protected function getAllTypo3BackendLanguages(): array
    {
        $languages = array_merge(
            ['default'],
            array_values($GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['lang']['availableLanguages'] ?? [])
        );

        return $languages;
    }

    /**
     * @return LanguageService
     */
    protected function getLanguageService(): LanguageService
    {
        return $GLOBALS['LANG'];
    }
}

TYPO3 / TYPO3.CMS

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TranslationService::translate() F

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