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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\XPath\Extension;
- use Symfony\Component\CssSelector\Node;
- use Symfony\Component\CssSelector\XPath\Translator;
- use Symfony\Component\CssSelector\XPath\XPathExpr;
- /**
- * XPath expression translator node 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 <jeanfrancois.simon@sensiolabs.com>
- *
- * @internal
- */
- class NodeExtension extends AbstractExtension
- {
- const ELEMENT_NAME_IN_LOWER_CASE = 1;
- const ATTRIBUTE_NAME_IN_LOWER_CASE = 2;
- const ATTRIBUTE_VALUE_IN_LOWER_CASE = 4;
- /**
- * @var int
- */
- private $flags;
- /**
- * Constructor.
- *
- * @param int $flags
- */
- public function __construct($flags = 0)
- {
- $this->flags = $flags;
- }
- /**
- * @param int $flag
- * @param bool $on
- *
- * @return $this
- */
- public function setFlag($flag, $on)
- {
- if ($on && !$this->hasFlag($flag)) {
- $this->flags += $flag;
- }
- if (!$on && $this->hasFlag($flag)) {
- $this->flags -= $flag;
- }
- return $this;
- }
- /**
- * @param int $flag
- *
- * @return bool
- */
- public function hasFlag($flag)
- {
- return (bool) ($this->flags & $flag);
- }
- /**
- * {@inheritdoc}
- */
- public function getNodeTranslators()
- {
- return array(
- 'Selector' => array($this, 'translateSelector'),
- 'CombinedSelector' => array($this, 'translateCombinedSelector'),
- 'Negation' => array($this, 'translateNegation'),
- 'Function' => array($this, 'translateFunction'),
- 'Pseudo' => array($this, 'translatePseudo'),
- 'Attribute' => array($this, 'translateAttribute'),
- 'Class' => array($this, 'translateClass'),
- 'Hash' => array($this, 'translateHash'),
- 'Element' => array($this, 'translateElement'),
- );
- }
- /**
- * @param Node\SelectorNode $node
- * @param Translator $translator
- *
- * @return XPathExpr
- */
- public function translateSelector(Node\SelectorNode $node, Translator $translator)
- {
- return $translator->nodeToXPath($node->getTree());
- }
- /**
- * @param Node\CombinedSelectorNode $node
- * @param Translator $translator
- *
- * @return XPathExpr
- */
- public function translateCombinedSelector(Node\CombinedSelectorNode $node, Translator $translator)
- {
- return $translator->addCombination($node->getCombinator(), $node->getSelector(), $node->getSubSelector());
- }
- /**
- * @param Node\NegationNode $node
- * @param Translator $translator
- *
- * @return XPathExpr
- */
- public function translateNegation(Node\NegationNode $node, Translator $translator)
- {
- $xpath = $translator->nodeToXPath($node->getSelector());
- $subXpath = $translator->nodeToXPath($node->getSubSelector());
- $subXpath->addNameTest();
- if ($subXpath->getCondition()) {
- return $xpath->addCondition(sprintf('not(%s)', $subXpath->getCondition()));
- }
- return $xpath->addCondition('0');
- }
- /**
- * @param Node\FunctionNode $node
- * @param Translator $translator
- *
- * @return XPathExpr
- */
- public function translateFunction(Node\FunctionNode $node, Translator $translator)
- {
- $xpath = $translator->nodeToXPath($node->getSelector());
- return $translator->addFunction($xpath, $node);
- }
- /**
- * @param Node\PseudoNode $node
- * @param Translator $translator
- *
- * @return XPathExpr
- */
- public function translatePseudo(Node\PseudoNode $node, Translator $translator)
- {
- $xpath = $translator->nodeToXPath($node->getSelector());
- return $translator->addPseudoClass($xpath, $node->getIdentifier());
- }
- /**
- * @param Node\AttributeNode $node
- * @param Translator $translator
- *
- * @return XPathExpr
- */
- public function translateAttribute(Node\AttributeNode $node, Translator $translator)
- {
- $name = $node->getAttribute();
- $safe = $this->isSafeName($name);
- if ($this->hasFlag(self::ATTRIBUTE_NAME_IN_LOWER_CASE)) {
- $name = strtolower($name);
- }
- if ($node->getNamespace()) {
- $name = sprintf('%s:%s', $node->getNamespace(), $name);
- $safe = $safe && $this->isSafeName($node->getNamespace());
- }
- $attribute = $safe ? '@'.$name : sprintf('attribute::*[name() = %s]', Translator::getXpathLiteral($name));
- $value = $node->getValue();
- $xpath = $translator->nodeToXPath($node->getSelector());
- if ($this->hasFlag(self::ATTRIBUTE_VALUE_IN_LOWER_CASE)) {
- $value = strtolower($value);
- }
- return $translator->addAttributeMatching($xpath, $node->getOperator(), $attribute, $value);
- }
- /**
- * @param Node\ClassNode $node
- * @param Translator $translator
- *
- * @return XPathExpr
- */
- public function translateClass(Node\ClassNode $node, Translator $translator)
- {
- $xpath = $translator->nodeToXPath($node->getSelector());
- return $translator->addAttributeMatching($xpath, '~=', '@class', $node->getName());
- }
- /**
- * @param Node\HashNode $node
- * @param Translator $translator
- *
- * @return XPathExpr
- */
- public function translateHash(Node\HashNode $node, Translator $translator)
- {
- $xpath = $translator->nodeToXPath($node->getSelector());
- return $translator->addAttributeMatching($xpath, '=', '@id', $node->getId());
- }
- /**
- * @param Node\ElementNode $node
- *
- * @return XPathExpr
- */
- public function translateElement(Node\ElementNode $node)
- {
- $element = $node->getElement();
- if ($this->hasFlag(self::ELEMENT_NAME_IN_LOWER_CASE)) {
- $element = strtolower($element);
- }
- if ($element) {
- $safe = $this->isSafeName($element);
- } else {
- $element = '*';
- $safe = true;
- }
- if ($node->getNamespace()) {
- $element = sprintf('%s:%s', $node->getNamespace(), $element);
- $safe = $safe && $this->isSafeName($node->getNamespace());
- }
- $xpath = new XPathExpr('', $element);
- if (!$safe) {
- $xpath->addNameTest();
- }
- return $xpath;
- }
- /**
- * {@inheritdoc}
- */
- public function getName()
- {
- return 'node';
- }
- /**
- * Tests if given name is safe.
- *
- * @param string $name
- *
- * @return bool
- */
- private function isSafeName($name)
- {
- return 0 < preg_match('~^[a-zA-Z_][a-zA-Z0-9_.-]*$~', $name);
- }
- }
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