143 lines
3.9 KiB
PHP
143 lines
3.9 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\CssSelector\Node;
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use Symfony\Component\CssSelector\Exception\ParseException;
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/**
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* CombinedSelectorNode represents a combinator node.
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*
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* This component is a port of the Python lxml library,
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* which is copyright Infrae and distributed under the BSD license.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class CombinedSelectorNode implements NodeInterface
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{
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protected static $methodMapping = array(
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' ' => 'descendant',
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'>' => 'child',
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'+' => 'direct_adjacent',
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'~' => 'indirect_adjacent',
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);
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protected $selector;
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protected $combinator;
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protected $subselector;
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/**
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* The constructor.
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*
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* @param NodeInterface $selector The XPath selector
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* @param string $combinator The combinator
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* @param NodeInterface $subselector The sub XPath selector
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*/
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public function __construct($selector, $combinator, $subselector)
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{
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$this->selector = $selector;
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$this->combinator = $combinator;
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$this->subselector = $subselector;
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}
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/**
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* {@inheritDoc}
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*/
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public function __toString()
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{
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$comb = $this->combinator == ' ' ? '<followed>' : $this->combinator;
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return sprintf('%s[%s %s %s]', __CLASS__, $this->selector, $comb, $this->subselector);
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}
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/**
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* {@inheritDoc}
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* @throws ParseException When unknown combinator is found
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*/
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public function toXpath()
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{
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if (!isset(self::$methodMapping[$this->combinator])) {
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throw new ParseException(sprintf('Unknown combinator: %s', $this->combinator));
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}
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$method = '_xpath_'.self::$methodMapping[$this->combinator];
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$path = $this->selector->toXpath();
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return $this->$method($path, $this->subselector);
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}
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/**
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* Joins a NodeInterface into the XPath of this object.
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*
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* @param XPathExpr $xpath The XPath expression for this object
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* @param NodeInterface $sub The NodeInterface object to add
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*
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* @return XPathExpr An XPath instance
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*/
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protected function _xpath_descendant($xpath, $sub)
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{
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// when sub is a descendant in any way of xpath
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$xpath->join('/descendant::', $sub->toXpath());
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return $xpath;
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}
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/**
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* Joins a NodeInterface as a child of this object.
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*
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* @param XPathExpr $xpath The parent XPath expression
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* @param NodeInterface $sub The NodeInterface object to add
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*
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* @return XPathExpr An XPath instance
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*/
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protected function _xpath_child($xpath, $sub)
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{
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// when sub is an immediate child of xpath
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$xpath->join('/', $sub->toXpath());
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return $xpath;
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}
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/**
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* Joins an XPath expression as an adjacent of another.
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*
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* @param XPathExpr $xpath The parent XPath expression
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* @param NodeInterface $sub The adjacent XPath expression
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*
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* @return XPathExpr An XPath instance
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*/
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protected function _xpath_direct_adjacent($xpath, $sub)
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{
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// when sub immediately follows xpath
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$xpath->join('/following-sibling::', $sub->toXpath());
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$xpath->addNameTest();
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$xpath->addCondition('position() = 1');
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return $xpath;
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}
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/**
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* Joins an XPath expression as an indirect adjacent of another.
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*
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* @param XPathExpr $xpath The parent XPath expression
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* @param NodeInterface $sub The indirect adjacent NodeInterface object
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*
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* @return XPathExpr An XPath instance
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*/
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protected function _xpath_indirect_adjacent($xpath, $sub)
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{
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// when sub comes somewhere after xpath as a sibling
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$xpath->join('/following-sibling::', $sub->toXpath());
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return $xpath;
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}
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}
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