Symfony\Component\DomCrawler\Form::setNode PHP 메소드

    protected function setNode(\DOMElement $node)
    {
        $this->button = $node;
        if ('button' === $node->nodeName || ('input' === $node->nodeName && in_array(strtolower($node->getAttribute('type')), array('submit', 'button', 'image')))) {
            if ($node->hasAttribute('form')) {
                // if the node has the HTML5-compliant 'form' attribute, use it
                $formId = $node->getAttribute('form');
                $form = $node->ownerDocument->getElementById($formId);
                if (null === $form) {
                    throw new \LogicException(sprintf('The selected node has an invalid form attribute (%s).', $formId));
                }
                $this->node = $form;

                return;
            }
            // we loop until we find a form ancestor
            do {
                if (null === $node = $node->parentNode) {
                    throw new \LogicException('The selected node does not have a form ancestor.');
                }
            } while ('form' !== $node->nodeName);
        } elseif ('form' !== $node->nodeName) {
            throw new \LogicException(sprintf('Unable to submit on a "%s" tag.', $node->nodeName));
        }

        $this->node = $node;
    }