symfony/src/Symfony/Components/CssSelector/Node/ElementNode.php

<?php

namespace Symfony\Components\CssSelector\Node;

use Symfony\Components\CssSelector\XPathExpr;

/*
 * This file is part of the symfony package.
 *
 * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * ElementNode represents a "namespace|element" node.
 *
 * This component is a port of the Python lxml library,
 * which is copyright Infrae and distributed under the BSD license.
 *
 * @package    symfony
 * @subpackage css_selector
 * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
 */
class ElementNode implements NodeInterface
{
  protected $namespace;
  protected $element;

  public function __construct($namespace, $element)
  {
    $this->namespace = $namespace;
    $this->element = $element;
  }

  public function __toString()
  {
    return sprintf('%s[%s]', __CLASS__, $this->formatElement());
  }

  public function formatElement()
  {
    if ($this->namespace == '*')
    {
      return $this->element;
    }
    else
    {
      return sprintf('%s|%s', $this->namespace, $this->element);
    }
  }

  public function toXpath()
  {
    if ($this->namespace == '*')
    {
      $el = strtolower($this->element);
    }
    else
    {
      // FIXME: Should we lowercase here?
      $el = sprintf('%s:%s', $this->namespace, $this->element);
    }

    return new XPathExpr(null, null, $el);
  }
}