/**
* Filters the list of nodes with a CSS selector.
*
* This method only works if you have installed the CssSelector Symfony Component.
*
* @param string $selector A CSS selector
*
* @return Crawler A new instance of Crawler with the filtered list of nodes
*
* @throws \RuntimeException if the CssSelector Component is not available
*/
public function filter($selector)
{
if (!class_exists('Symfony\\Component\\CssSelector\\Converter')) {
throw new \RuntimeException('Unable to filter with a CSS selector as the Symfony CssSelector 2.8+ is not installed (you can use filterXPath instead).');
}
$converter = new Converter($this->isHtml);
// The CssSelector already prefixes the selector with descendant-or-self::
return $this->filterRelativeXPath($converter->toXPath($selector));
}
public function testCssToXPathXml()
{
$converter = new Converter(false);
$this->assertEquals('descendant-or-self::H1', $converter->toXPath('H1'));
}