DataProvider.php

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<?php
namespace Magento\Translation\Model\Js;

use Magento\Framework\Exception\LocalizedException;

class DataProvider implements DataProviderInterface
{
    protected $appState;

    protected $config;

    protected $filesUtility;

    protected $fileReadFactory;

    protected $translate;

    public function __construct(
        \Magento\Framework\App\State $appState,
        Config $config,
        \Magento\Framework\Filesystem\File\ReadFactory $fileReadFactory,
        \Magento\Framework\Phrase\RendererInterface $translate,
        \Magento\Framework\Component\ComponentRegistrar $componentRegistrar,
        \Magento\Framework\Component\DirSearch $dirSearch,
        \Magento\Framework\View\Design\Theme\ThemePackageList $themePackageList,
        \Magento\Framework\App\Utility\Files $filesUtility = null
    ) {
        $this->appState = $appState;
        $this->config = $config;
        $this->fileReadFactory = $fileReadFactory;
        $this->translate = $translate;
        $this->filesUtility = (null !== $filesUtility) ?
            $filesUtility : new \Magento\Framework\App\Utility\Files(
                $componentRegistrar,
                $dirSearch,
                $themePackageList
            );
    }

    public function getData($themePath)
    {
        $areaCode = $this->appState->getAreaCode();

        $files = array_merge(
            $this->filesUtility->getJsFiles('base', $themePath),
            $this->filesUtility->getJsFiles($areaCode, $themePath),
            $this->filesUtility->getStaticHtmlFiles('base', $themePath),
            $this->filesUtility->getStaticHtmlFiles($areaCode, $themePath)
        );

        $dictionary = [];
        foreach ($files as $filePath) {
            $read = $this->fileReadFactory->create($filePath[0], \Magento\Framework\Filesystem\DriverPool::FILE);
            $content = $read->readAll();
            foreach ($this->getPhrases($content) as $phrase) {
                try {
                    $translatedPhrase = $this->translate->render([$phrase], []);
                    if ($phrase != $translatedPhrase) {
                        $dictionary[$phrase] = $translatedPhrase;
                    }
                } catch (\Exception $e) {
                    throw new LocalizedException(
                        __('Error while translating phrase "%s" in file %s.', $phrase, $filePath[0]),
                        $e
                    );
                }
            }
        }

        return $dictionary;
    }

    protected function getPhrases($content)
    {
        $phrases = [];
        foreach ($this->config->getPatterns() as $pattern) {
            $concatenatedContent = preg_replace('~(["\'])\s*?\+\s*?\1~', '', $content);
            $result = preg_match_all($pattern, $concatenatedContent, $matches);

            if ($result) {
                if (isset($matches[2])) {
                    foreach ($matches[2] as $match) {
                        $phrases[] = str_replace(["\'", '\"'], ["'", '"'], $match);
                    }
                }
            }
            if (false === $result) {
                throw new LocalizedException(
                    __('Error while generating js translation dictionary: "%s"', error_get_last())
                );
            }
        }
        return $phrases;
    }
}