PseudoClassExtension.php in Zircon Profile 8

Namespace

Symfony\Component\CssSelector\XPath\Extension

File

vendor/symfony/css-selector/XPath/Extension/PseudoClassExtension.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <[e-mail]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Symfony\Component\CssSelector\XPath\Extension;

use Symfony\Component\CssSelector\Exception\ExpressionErrorException;
use Symfony\Component\CssSelector\XPath\XPathExpr;

/**
 * XPath expression translator pseudo-class extension.
 *
 * This component is a port of the Python cssselect library,
 * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
 *
 * @author Jean-François Simon <[e-mail]>
 */
class PseudoClassExtension extends AbstractExtension {

  /**
   * {@inheritdoc}
   */
  public function getPseudoClassTranslators() {
    return array(
      'root' => array(
        $this,
        'translateRoot',
      ),
      'first-child' => array(
        $this,
        'translateFirstChild',
      ),
      'last-child' => array(
        $this,
        'translateLastChild',
      ),
      'first-of-type' => array(
        $this,
        'translateFirstOfType',
      ),
      'last-of-type' => array(
        $this,
        'translateLastOfType',
      ),
      'only-child' => array(
        $this,
        'translateOnlyChild',
      ),
      'only-of-type' => array(
        $this,
        'translateOnlyOfType',
      ),
      'empty' => array(
        $this,
        'translateEmpty',
      ),
    );
  }

  /**
   * @param XPathExpr $xpath
   *
   * @return XPathExpr
   */
  public function translateRoot(XPathExpr $xpath) {
    return $xpath
      ->addCondition('not(parent::*)');
  }

  /**
   * @param XPathExpr $xpath
   *
   * @return XPathExpr
   */
  public function translateFirstChild(XPathExpr $xpath) {
    return $xpath
      ->addStarPrefix()
      ->addNameTest()
      ->addCondition('position() = 1');
  }

  /**
   * @param XPathExpr $xpath
   *
   * @return XPathExpr
   */
  public function translateLastChild(XPathExpr $xpath) {
    return $xpath
      ->addStarPrefix()
      ->addNameTest()
      ->addCondition('position() = last()');
  }

  /**
   * @param XPathExpr $xpath
   *
   * @return XPathExpr
   *
   * @throws ExpressionErrorException
   */
  public function translateFirstOfType(XPathExpr $xpath) {
    if ('*' === $xpath
      ->getElement()) {
      throw new ExpressionErrorException('"*:first-of-type" is not implemented.');
    }
    return $xpath
      ->addStarPrefix()
      ->addCondition('position() = 1');
  }

  /**
   * @param XPathExpr $xpath
   *
   * @return XPathExpr
   *
   * @throws ExpressionErrorException
   */
  public function translateLastOfType(XPathExpr $xpath) {
    if ('*' === $xpath
      ->getElement()) {
      throw new ExpressionErrorException('"*:last-of-type" is not implemented.');
    }
    return $xpath
      ->addStarPrefix()
      ->addCondition('position() = last()');
  }

  /**
   * @param XPathExpr $xpath
   *
   * @return XPathExpr
   */
  public function translateOnlyChild(XPathExpr $xpath) {
    return $xpath
      ->addStarPrefix()
      ->addNameTest()
      ->addCondition('last() = 1');
  }

  /**
   * @param XPathExpr $xpath
   *
   * @return XPathExpr
   *
   * @throws ExpressionErrorException
   */
  public function translateOnlyOfType(XPathExpr $xpath) {
    if ('*' === $xpath
      ->getElement()) {
      throw new ExpressionErrorException('"*:only-of-type" is not implemented.');
    }
    return $xpath
      ->addCondition('last() = 1');
  }

  /**
   * @param XPathExpr $xpath
   *
   * @return XPathExpr
   */
  public function translateEmpty(XPathExpr $xpath) {
    return $xpath
      ->addCondition('not(*) and not(string-length())');
  }

  /**
   * {@inheritdoc}
   */
  public function getName() {
    return 'pseudo-class';
  }

}

Classes

Name	Description
PseudoClassExtension	XPath expression translator pseudo-class extension.