Options.php

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<?php
declare(strict_types=1);

namespace Magento\Framework\Locale\Deployed;

use Magento\Framework\App\DeploymentConfig;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\App\State;
use Magento\Framework\Config\ConfigOptionsListConstants as Constants;
use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Locale\AvailableLocalesInterface;
use Magento\Framework\Locale\ListsInterface;
use Magento\Framework\Locale\OptionInterface;
use Magento\Framework\View\DesignInterface;

class Options implements OptionInterface
{
    private $state;

    private $availableLocales;

    private $design;

    private $localeLists;

    private $deploymentConfig;

    public function __construct(
        ListsInterface $localeLists,
        State $state,
        AvailableLocalesInterface $availableLocales,
        DesignInterface $design,
        DeploymentConfig $deploymentConfig = null
    ) {
        $this->localeLists = $localeLists;
        $this->state = $state;
        $this->availableLocales = $availableLocales;
        $this->design = $design;
        $this->deploymentConfig = $deploymentConfig ?: ObjectManager::getInstance()->get(DeploymentConfig::class);
    }

    public function getOptionLocales(): array
    {
        return $this->filterLocales($this->localeLists->getOptionLocales());
    }

    public function getTranslatedOptionLocales(): array
    {
        return $this->filterLocales($this->localeLists->getTranslatedOptionLocales());
    }

    private function filterLocales(array $locales): array
    {
        if ($this->state->getMode() != State::MODE_PRODUCTION
            || $this->deploymentConfig->getConfigData(Constants::CONFIG_PATH_SCD_ON_DEMAND_IN_PRODUCTION)) {
            return $locales;
        }

        $theme = $this->design->getDesignTheme();
        try {
            $availableLocales = $this->availableLocales->getList($theme->getCode(), $theme->getArea());
        } catch (LocalizedException $e) {
            $availableLocales = [];
        }

        return array_filter($locales, function ($localeData) use ($availableLocales) {
            return in_array($localeData['value'], $availableLocales);
        });
    }
}