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PseudoNode.php
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PseudoNode.php
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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\CssSelector\Node;
use Symfony\Component\CssSelector\Exception\ParseException;
/**
* PseudoNode represents a "selector:ident" node.
*
* This component is a port of the Python lxml library,
* which is copyright Infrae and distributed under the BSD license.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class PseudoNode implements NodeInterface
{
static protected $unsupported = array(
'indeterminate', 'first-line', 'first-letter',
'selection', 'before', 'after', 'link', 'visited',
'active', 'focus', 'hover',
);
protected $element;
protected $type;
protected $ident;
/**
* Constructor.
*
* @param NodeInterface $element The NodeInterface element
* @param string $type Node type
* @param string $ident The ident
*
* @throws ParseException When incorrect PseudoNode type is given
*/
public function __construct($element, $type, $ident)
{
$this->element = $element;
if (!in_array($type, array(':', '::'))) {
throw new ParseException(sprintf('The PseudoNode type can only be : or :: (%s given).', $type));
}
$this->type = $type;
$this->ident = $ident;
}
/**
* {@inheritDoc}
*/
public function __toString()
{
return sprintf('%s[%s%s%s]', __CLASS__, $this->element, $this->type, $this->ident);
}
/**
* {@inheritDoc}
* @throws ParseException When unsupported or unknown pseudo-class is found
*/
public function toXpath()
{
$elXpath = $this->element->toXpath();
if (in_array($this->ident, self::$unsupported)) {
throw new ParseException(sprintf('The pseudo-class %s is unsupported', $this->ident));
}
$method = 'xpath_'.str_replace('-', '_', $this->ident);
if (!method_exists($this, $method)) {
throw new ParseException(sprintf('The pseudo-class %s is unknown', $this->ident));
}
return $this->$method($elXpath);
}
/**
* @param XPathExpr $xpath The XPath expression
*
* @return XPathExpr The modified XPath expression
*/
protected function xpath_checked($xpath)
{
// FIXME: is this really all the elements?
$xpath->addCondition("(@selected or @checked) and (name(.) = 'input' or name(.) = 'option')");
return $xpath;
}
/**
* @param XPathExpr $xpath The XPath expression
*
* @return XPathExpr The modified XPath expression
*
* @throws ParseException If this element is the root element
*/
protected function xpath_root($xpath)
{
// if this element is the root element
throw new ParseException();
}
/**
* Marks this XPath expression as the first child.
*
* @param XPathExpr $xpath The XPath expression
*
* @return XPathExpr The modified expression
*/
protected function xpath_first_child($xpath)
{
$xpath->addStarPrefix();
$xpath->addNameTest();
$xpath->addCondition('position() = 1');
return $xpath;
}
/**
* Sets the XPath to be the last child.
*
* @param XPathExpr $xpath The XPath expression
*
* @return XPathExpr The modified expression
*/
protected function xpath_last_child($xpath)
{
$xpath->addStarPrefix();
$xpath->addNameTest();
$xpath->addCondition('position() = last()');
return $xpath;
}
/**
* Sets the XPath expression to be the first of type.
*
* @param XPathExpr $xpath The XPath expression
*
* @return XPathExpr The modified expression
*/
protected function xpath_first_of_type($xpath)
{
if ($xpath->getElement() == '*') {
throw new ParseException('*:first-of-type is not implemented');
}
$xpath->addStarPrefix();
$xpath->addCondition('position() = 1');
return $xpath;
}
/**
* Sets the XPath expression to be the last of type.
*
* @param XPathExpr $xpath The XPath expression
*
* @return XPathExpr The modified expression
*
* @throws ParseException Because *:last-of-type is not implemented
*/
protected function xpath_last_of_type($xpath)
{
if ($xpath->getElement() == '*') {
throw new ParseException('*:last-of-type is not implemented');
}
$xpath->addStarPrefix();
$xpath->addCondition('position() = last()');
return $xpath;
}
/**
* Sets the XPath expression to be the only child.
*
* @param XPathExpr $xpath The XPath expression
*
* @return XPathExpr The modified expression
*/
protected function xpath_only_child($xpath)
{
$xpath->addNameTest();
$xpath->addStarPrefix();
$xpath->addCondition('last() = 1');
return $xpath;
}
/**
* Sets the XPath expression to be only of type.
*
* @param XPathExpr $xpath The XPath expression
*
* @return XPathExpr The modified expression
*
* @throws ParseException Because *:only-of-type is not implemented
*/
protected function xpath_only_of_type($xpath)
{
if ($xpath->getElement() == '*') {
throw new ParseException('*:only-of-type is not implemented');
}
$xpath->addCondition('last() = 1');
return $xpath;
}
/**
* undocumented function
*
* @param XPathExpr $xpath The XPath expression
*
* @return XPathExpr The modified expression
*/
protected function xpath_empty($xpath)
{
$xpath->addCondition('not(*) and not(normalize-space())');
return $xpath;
}
}