InitialThemeSource.php

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<?php
namespace Magento\Theme\Model\Source;

use Magento\Framework\App\Config\ConfigSourceInterface;
use Magento\Framework\App\DeploymentConfig;
use Magento\Framework\DataObject\Factory as DataObjectFactory;
use Magento\Theme\Model\ResourceModel\Theme;
use Magento\Theme\Model\ResourceModel\ThemeFactory;

class InitialThemeSource implements ConfigSourceInterface
{
    private $deploymentConfig;

    private $themeFactory;

    private $dataObjectFactory;

    private $data;

    public function __construct(
        DeploymentConfig $deploymentConfig,
        ThemeFactory $themeFactory,
        DataObjectFactory $dataObjectFactory
    ) {
        $this->deploymentConfig = $deploymentConfig;
        $this->themeFactory = $themeFactory;
        $this->dataObjectFactory = $dataObjectFactory;
    }

    public function get($path = '')
    {
        if (!$this->deploymentConfig->isDbAvailable()) {
            return [];
        }

        if (!$this->data) {
            $rawThemes = $this->fetchThemes();
            $themes = [];

            foreach ($rawThemes as $themeRow) {
                unset($themeRow['theme_id'], $themeRow['preview_image']);
                $themePath = $themeRow['area'] . '/' . $themeRow['theme_path'];
                $themes[$themePath] = $themeRow;

                if (isset($rawThemes[$themeRow['parent_id']]['code'])) {
                    $themes[$themePath]['parent_id'] = $rawThemes[$themeRow['parent_id']]['code'];
                }
            }

            $this->data = $this->dataObjectFactory->create($themes);
        }

        return $this->data->getData($path) ?: [];
    }

    private function fetchThemes()
    {
        $theme = $this->themeFactory->create();
        $select = $theme->getConnection()->select()
            ->from($theme->getMainTable())
            ->order('theme_id');

        return $theme->getConnection()->fetchAssoc($select);
    }
}