XPath.php

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<?php
namespace enshrined\svgSanitize\data;
 
class XPath extends \DOMXPath
{
    const DEFAULT_NAMESPACE_PREFIX = 'svg';
 
    protected $defaultNamespaceURI;
 
    public function __construct(\DOMDocument $doc)
    {
        parent::__construct($doc);
        $this->handleDefaultNamespace();
    }
 
    public function createNodeName($nodeName)
    {
        if (empty($this->defaultNamespaceURI)) {
            return $nodeName;
        }
        return self::DEFAULT_NAMESPACE_PREFIX . ':' . $nodeName;
    }
 
    protected function handleDefaultNamespace()
    {
        $rootElements = $this->getRootElements();
 
        if (count($rootElements) !== 1) {
            throw new \LogicException(
                sprintf('Got %d svg elements, expected exactly one', count($rootElements)),
                1570870568
            );
        }
        $this->defaultNamespaceURI = (string)$rootElements[0]->namespaceURI;
 
        if ($this->defaultNamespaceURI !== '') {
            $this->registerNamespace(self::DEFAULT_NAMESPACE_PREFIX, $this->defaultNamespaceURI);
        }
    }
 
    protected function getRootElements()
    {
        $rootElements = [];
        $elements = $this->document->getElementsByTagName('svg');
        foreach ($elements as $element) {
            if ($element->parentNode !== $this->document) {
                continue;
            }
            $rootElements[] = $element;
        }
        return $rootElements;
    }
}