Theme.php

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<?php
namespace Magento\Framework\Config;

class Theme
{
    const THEME_PATH_SEPARATOR = '/';

    protected $_data;

    protected $urnResolver;

    public function __construct(
        \Magento\Framework\Config\Dom\UrnResolver $urnResolver,
        $configContent = null
    ) {
        $this->urnResolver = $urnResolver;
        $this->_data = $this->_extractData($configContent);
    }

    public function getSchemaFile()
    {
        return $this->urnResolver->getRealPath('urn:magento:framework:Config/etc/theme.xsd');
    }

    protected function _extractData($configContent)
    {
        $data = [
            'title' => null,
            'media' => null,
            'parent' => null,
        ];

        if (!empty($configContent)) {
            $dom = new \DOMDocument();
            $dom->loadXML($configContent);
            // todo: validation of the document
            $themeNode = $dom->getElementsByTagName('theme')->item(0);
            $themeTitleNode = $themeNode->getElementsByTagName('title')->item(0);
            $data['title'] = $themeTitleNode ? $themeTitleNode->nodeValue : null;
            $mediaNode = $themeNode->getElementsByTagName('media')->item(0);
            $previewImage = $mediaNode ? $mediaNode->getElementsByTagName('preview_image')->item(0)->nodeValue : '';
            $data['media']['preview_image'] = $previewImage;
            $themeParentNode = $themeNode->getElementsByTagName('parent')->item(0);
            $data['parent'] = $themeParentNode ? $themeParentNode->nodeValue : null;
        }

        return $data;
    }

    public function getThemeTitle()
    {
        return $this->_data['title'];
    }

    public function getMedia()
    {
        return $this->_data['media'];
    }

    public function getParentTheme()
    {
        $parentTheme = $this->_data['parent'];
        if (!$parentTheme) {
            return null;
        }
        return explode(self::THEME_PATH_SEPARATOR, $parentTheme);
    }
}