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Edit File : Translator.php \| Size : 7.15 KB
<?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 { private $mainParser; /* * @var ParserInterface[] / private $shortcutParsers = []; /* * @var Extension\ExtensionInterface[] / private $extensions = []; private $nodeTranslators = []; private $combinationTranslators = []; private $functionTranslators = []; private $pseudoClassTranslators = []; private $attributeMatchingTranslators = []; 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()) ; } public static function getXpathLiteral(string $element): string { if (false === strpos($element, "'")) { return "'".$element."'"; } if (false === strpos($element, '"')) { return '"'.$element.'"'; } $string = $element; $parts = []; 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(string $cssExpr, string $prefix = 'descendant-or-self::'): string { $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, string $prefix = 'descendant-or-self::'): string { return ($prefix ?: '').$this->nodeToXPath($selector); } /* * @return $this / public function registerExtension(Extension\ExtensionInterface $extension): self { $this->extensions[$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; } /* * @throws ExpressionErrorException / public function getExtension(string $name): Extension\ExtensionInterface { if (!isset($this->extensions[$name])) { throw new ExpressionErrorException(sprintf('Extension "%s" not registered.', $name)); } return $this->extensions[$name]; } /* * @return $this / public function registerParserShortcut(ParserInterface $shortcut): self { $this->shortcutParsers[] = $shortcut; return $this; } /* * @throws ExpressionErrorException / public function nodeToXPath(NodeInterface $node): XPathExpr { if (!isset($this->nodeTranslators[$node->getNodeName()])) { throw new ExpressionErrorException(sprintf('Node "%s" not supported.', $node->getNodeName())); } return $this->nodeTranslators[$node->getNodeName()]($node, $this); } /* * @throws ExpressionErrorException / public function addCombination(string $combiner, NodeInterface $xpath, NodeInterface $combinedXpath): XPathExpr { if (!isset($this->combinationTranslators[$combiner])) { throw new ExpressionErrorException(sprintf('Combiner "%s" not supported.', $combiner)); } return $this->combinationTranslators[$combiner]($this->nodeToXPath($xpath), $this->nodeToXPath($combinedXpath)); } /* * @throws ExpressionErrorException / public function addFunction(XPathExpr $xpath, FunctionNode $function): XPathExpr { if (!isset($this->functionTranslators[$function->getName()])) { throw new ExpressionErrorException(sprintf('Function "%s" not supported.', $function->getName())); } return $this->functionTranslators[$function->getName()]($xpath, $function); } /* * @throws ExpressionErrorException / public function addPseudoClass(XPathExpr $xpath, string $pseudoClass): XPathExpr { if (!isset($this->pseudoClassTranslators[$pseudoClass])) { throw new ExpressionErrorException(sprintf('Pseudo-class "%s" not supported.', $pseudoClass)); } return $this->pseudoClassTranslators[$pseudoClass]($xpath); } /* * @throws ExpressionErrorException / public function addAttributeMatching(XPathExpr $xpath, string $operator, string $attribute, $value): XPathExpr { if (!isset($this->attributeMatchingTranslators[$operator])) { throw new ExpressionErrorException(sprintf('Attribute matcher operator "%s" not supported.', $operator)); } return $this->attributeMatchingTranslators[$operator]($xpath, $attribute, $value); } /* * @return SelectorNode[] */ private function parseSelectors(string $css): array { foreach ($this->shortcutParsers as $shortcut) { $tokens = $shortcut->parse($css); if (!empty($tokens)) { return $tokens; } } return $this->mainParser->parse($css); } } Back

Edit File : Translator.php | Size : 7.15 KB

<?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
{
    private $mainParser;

/**
     * @var ParserInterface[]
     */
    private $shortcutParsers = [];

/**
     * @var Extension\ExtensionInterface[]
     */
    private $extensions = [];

private $nodeTranslators = [];
    private $combinationTranslators = [];
    private $functionTranslators = [];
    private $pseudoClassTranslators = [];
    private $attributeMatchingTranslators = [];

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())
        ;
    }

public static function getXpathLiteral(string $element): string
    {
        if (false === strpos($element, "'")) {
            return "'".$element."'";
        }

if (false === strpos($element, '"')) {
            return '"'.$element.'"';
        }

$string = $element;
        $parts = [];
        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(string $cssExpr, string $prefix = 'descendant-or-self::'): string
    {
        $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, string $prefix = 'descendant-or-self::'): string
    {
        return ($prefix ?: '').$this->nodeToXPath($selector);
    }

/**
     * @return $this
     */
    public function registerExtension(Extension\ExtensionInterface $extension): self
    {
        $this->extensions[$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;
    }

/**
     * @throws ExpressionErrorException
     */
    public function getExtension(string $name): Extension\ExtensionInterface
    {
        if (!isset($this->extensions[$name])) {
            throw new ExpressionErrorException(sprintf('Extension "%s" not registered.', $name));
        }

return $this->extensions[$name];
    }

/**
     * @return $this
     */
    public function registerParserShortcut(ParserInterface $shortcut): self
    {
        $this->shortcutParsers[] = $shortcut;

return $this;
    }

/**
     * @throws ExpressionErrorException
     */
    public function nodeToXPath(NodeInterface $node): XPathExpr
    {
        if (!isset($this->nodeTranslators[$node->getNodeName()])) {
            throw new ExpressionErrorException(sprintf('Node "%s" not supported.', $node->getNodeName()));
        }

return $this->nodeTranslators[$node->getNodeName()]($node, $this);
    }

/**
     * @throws ExpressionErrorException
     */
    public function addCombination(string $combiner, NodeInterface $xpath, NodeInterface $combinedXpath): XPathExpr
    {
        if (!isset($this->combinationTranslators[$combiner])) {
            throw new ExpressionErrorException(sprintf('Combiner "%s" not supported.', $combiner));
        }

return $this->combinationTranslators[$combiner]($this->nodeToXPath($xpath), $this->nodeToXPath($combinedXpath));
    }

/**
     * @throws ExpressionErrorException
     */
    public function addFunction(XPathExpr $xpath, FunctionNode $function): XPathExpr
    {
        if (!isset($this->functionTranslators[$function->getName()])) {
            throw new ExpressionErrorException(sprintf('Function "%s" not supported.', $function->getName()));
        }

return $this->functionTranslators[$function->getName()]($xpath, $function);
    }

/**
     * @throws ExpressionErrorException
     */
    public function addPseudoClass(XPathExpr $xpath, string $pseudoClass): XPathExpr
    {
        if (!isset($this->pseudoClassTranslators[$pseudoClass])) {
            throw new ExpressionErrorException(sprintf('Pseudo-class "%s" not supported.', $pseudoClass));
        }

return $this->pseudoClassTranslators[$pseudoClass]($xpath);
    }

/**
     * @throws ExpressionErrorException
     */
    public function addAttributeMatching(XPathExpr $xpath, string $operator, string $attribute, $value): XPathExpr
    {
        if (!isset($this->attributeMatchingTranslators[$operator])) {
            throw new ExpressionErrorException(sprintf('Attribute matcher operator "%s" not supported.', $operator));
        }

return $this->attributeMatchingTranslators[$operator]($xpath, $attribute, $value);
    }

/**
     * @return SelectorNode[]
     */
    private function parseSelectors(string $css): array
    {
        foreach ($this->shortcutParsers as $shortcut) {
            $tokens = $shortcut->parse($css);

if (!empty($tokens)) {
                return $tokens;
            }
        }

return $this->mainParser->parse($css);
    }
}

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