CssSelectorConverter example

namespace Symfony\Component\CssSelector\Tests;

use PHPUnit\Framework\TestCase;
use Symfony\Component\CssSelector\CssSelectorConverter;
use Symfony\Component\CssSelector\Exception\ParseException;

class CssSelectorConverterTest extends TestCase
{
    public function testCssToXPath()
    {
        $converter = new CssSelectorConverter();

        $this->assertEquals('descendant-or-self::*', $converter->toXPath(''));
        $this->assertEquals('descendant-or-self::h1', $converter->toXPath('h1'));
        $this->assertEquals("descendant-or-self::h1[@id = 'foo']", $converter->toXPath('h1#foo'));
        $this->assertEquals("descendant-or-self::h1[@class and contains(concat(' ', normalize-space(@class), ' '), ' foo ')]", $converter->toXPath('h1.foo'));
        $this->assertEquals('descendant-or-self::foo:h1', $converter->toXPath('foo|h1'));
        $this->assertEquals('descendant-or-self::h1', $converter->toXPath('H1'));

        // Test the cache layer         $converter = new CssSelectorConverter();
        $this->assertEquals('descendant-or-self::h1', $converter->toXPath('H1'));
    }

    /** * @throws \LogicException If the CssSelector Component is not available */
    private function createCssSelectorConverter(): CssSelectorConverter
    {
        if (!class_exists(CssSelectorConverter::class)) {
            throw new \LogicException('To filter with a CSS selector, install the CssSelector component ("composer require symfony/css-selector"). Or use filterXpath instead.');
        }

        return new CssSelectorConverter($this->isHtml);
    }

    /** * Parse string into DOMDocument object using HTML5 parser if the content is HTML5 and the library is available. * Use libxml parser otherwise. */
    private function parseHtmlString(string $content, string $charset): \DOMDocument
    {
        if ($this->canParseHtml5String($content)) {
            return $this->parseHtml5($content, $charset);
        }