--- /dev/null
+<?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;
+
+use Symfony\Component\CssSelector\Exception\ExpressionErrorException;
+use Symfony\Component\CssSelector\Node\FunctionNode;
+use Symfony\Component\CssSelector\Node\NodeInterface;
+use Symfony\Component\CssSelector\Node\SelectorNode;
+use Symfony\Component\CssSelector\Parser\Parser;
+use Symfony\Component\CssSelector\Parser\ParserInterface;
+
+/**
+ * XPath expression translator interface.
+ *
+ * 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 Translator implements TranslatorInterface
+{
+ /**
+ * @var ParserInterface
+ */
+ private $mainParser;
+
+ /**
+ * @var ParserInterface[]
+ */
+ private $shortcutParsers = array();
+
+ /**
+ * @var Extension\ExtensionInterface
+ */
+ private $extensions = array();
+
+ /**
+ * @var array
+ */
+ private $nodeTranslators = array();
+
+ /**
+ * @var array
+ */
+ private $combinationTranslators = array();
+
+ /**
+ * @var array
+ */
+ private $functionTranslators = array();
+
+ /**
+ * @var array
+ */
+ private $pseudoClassTranslators = array();
+
+ /**
+ * @var array
+ */
+ private $attributeMatchingTranslators = array();
+
+ public function __construct(ParserInterface $parser = null)
+ {
+ $this->mainParser = $parser ?: new Parser();
+
+ $this
+ ->registerExtension(new Extension\NodeExtension())
+ ->registerExtension(new Extension\CombinationExtension())
+ ->registerExtension(new Extension\FunctionExtension())
+ ->registerExtension(new Extension\PseudoClassExtension())
+ ->registerExtension(new Extension\AttributeMatchingExtension())
+ ;
+ }
+
+ /**
+ * @param string $element
+ *
+ * @return string
+ */
+ public static function getXpathLiteral($element)
+ {
+ if (false === strpos($element, "'")) {
+ return "'".$element."'";
+ }
+
+ if (false === strpos($element, '"')) {
+ return '"'.$element.'"';
+ }
+
+ $string = $element;
+ $parts = array();
+ while (true) {
+ if (false !== $pos = strpos($string, "'")) {
+ $parts[] = sprintf("'%s'", substr($string, 0, $pos));
+ $parts[] = "\"'\"";
+ $string = substr($string, $pos + 1);
+ } else {
+ $parts[] = "'$string'";
+ break;
+ }
+ }
+
+ return sprintf('concat(%s)', implode($parts, ', '));
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function cssToXPath($cssExpr, $prefix = 'descendant-or-self::')
+ {
+ $selectors = $this->parseSelectors($cssExpr);
+
+ /** @var SelectorNode $selector */
+ foreach ($selectors as $index => $selector) {
+ if (null !== $selector->getPseudoElement()) {
+ throw new ExpressionErrorException('Pseudo-elements are not supported.');
+ }
+
+ $selectors[$index] = $this->selectorToXPath($selector, $prefix);
+ }
+
+ return implode(' | ', $selectors);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function selectorToXPath(SelectorNode $selector, $prefix = 'descendant-or-self::')
+ {
+ return ($prefix ?: '').$this->nodeToXPath($selector);
+ }
+
+ /**
+ * Registers an extension.
+ *
+ * @param Extension\ExtensionInterface $extension
+ *
+ * @return $this
+ */
+ public function registerExtension(Extension\ExtensionInterface $extension)
+ {
+ $this->extensions[$extension->getName()] = $extension;
+
+ $this->nodeTranslators = array_merge($this->nodeTranslators, $extension->getNodeTranslators());
+ $this->combinationTranslators = array_merge($this->combinationTranslators, $extension->getCombinationTranslators());
+ $this->functionTranslators = array_merge($this->functionTranslators, $extension->getFunctionTranslators());
+ $this->pseudoClassTranslators = array_merge($this->pseudoClassTranslators, $extension->getPseudoClassTranslators());
+ $this->attributeMatchingTranslators = array_merge($this->attributeMatchingTranslators, $extension->getAttributeMatchingTranslators());
+
+ return $this;
+ }
+
+ /**
+ * @param string $name
+ *
+ * @return Extension\ExtensionInterface
+ *
+ * @throws ExpressionErrorException
+ */
+ public function getExtension($name)
+ {
+ if (!isset($this->extensions[$name])) {
+ throw new ExpressionErrorException(sprintf('Extension "%s" not registered.', $name));
+ }
+
+ return $this->extensions[$name];
+ }
+
+ /**
+ * Registers a shortcut parser.
+ *
+ * @param ParserInterface $shortcut
+ *
+ * @return $this
+ */
+ public function registerParserShortcut(ParserInterface $shortcut)
+ {
+ $this->shortcutParsers[] = $shortcut;
+
+ return $this;
+ }
+
+ /**
+ * @param NodeInterface $node
+ *
+ * @return XPathExpr
+ *
+ * @throws ExpressionErrorException
+ */
+ public function nodeToXPath(NodeInterface $node)
+ {
+ if (!isset($this->nodeTranslators[$node->getNodeName()])) {
+ throw new ExpressionErrorException(sprintf('Node "%s" not supported.', $node->getNodeName()));
+ }
+
+ return call_user_func($this->nodeTranslators[$node->getNodeName()], $node, $this);
+ }
+
+ /**
+ * @param string $combiner
+ * @param NodeInterface $xpath
+ * @param NodeInterface $combinedXpath
+ *
+ * @return XPathExpr
+ *
+ * @throws ExpressionErrorException
+ */
+ public function addCombination($combiner, NodeInterface $xpath, NodeInterface $combinedXpath)
+ {
+ if (!isset($this->combinationTranslators[$combiner])) {
+ throw new ExpressionErrorException(sprintf('Combiner "%s" not supported.', $combiner));
+ }
+
+ return call_user_func($this->combinationTranslators[$combiner], $this->nodeToXPath($xpath), $this->nodeToXPath($combinedXpath));
+ }
+
+ /**
+ * @param XPathExpr $xpath
+ * @param FunctionNode $function
+ *
+ * @return XPathExpr
+ *
+ * @throws ExpressionErrorException
+ */
+ public function addFunction(XPathExpr $xpath, FunctionNode $function)
+ {
+ if (!isset($this->functionTranslators[$function->getName()])) {
+ throw new ExpressionErrorException(sprintf('Function "%s" not supported.', $function->getName()));
+ }
+
+ return call_user_func($this->functionTranslators[$function->getName()], $xpath, $function);
+ }
+
+ /**
+ * @param XPathExpr $xpath
+ * @param string $pseudoClass
+ *
+ * @return XPathExpr
+ *
+ * @throws ExpressionErrorException
+ */
+ public function addPseudoClass(XPathExpr $xpath, $pseudoClass)
+ {
+ if (!isset($this->pseudoClassTranslators[$pseudoClass])) {
+ throw new ExpressionErrorException(sprintf('Pseudo-class "%s" not supported.', $pseudoClass));
+ }
+
+ return call_user_func($this->pseudoClassTranslators[$pseudoClass], $xpath);
+ }
+
+ /**
+ * @param XPathExpr $xpath
+ * @param string $operator
+ * @param string $attribute
+ * @param string $value
+ *
+ * @return XPathExpr
+ *
+ * @throws ExpressionErrorException
+ */
+ public function addAttributeMatching(XPathExpr $xpath, $operator, $attribute, $value)
+ {
+ if (!isset($this->attributeMatchingTranslators[$operator])) {
+ throw new ExpressionErrorException(sprintf('Attribute matcher operator "%s" not supported.', $operator));
+ }
+
+ return call_user_func($this->attributeMatchingTranslators[$operator], $xpath, $attribute, $value);
+ }
+
+ /**
+ * @param string $css
+ *
+ * @return SelectorNode[]
+ */
+ private function parseSelectors($css)
+ {
+ foreach ($this->shortcutParsers as $shortcut) {
+ $tokens = $shortcut->parse($css);
+
+ if (!empty($tokens)) {
+ return $tokens;
+ }
+ }
+
+ return $this->mainParser->parse($css);
+ }
+}
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