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Code Editor : FunctionExtension.php
<?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\Exception\ExpressionErrorException; use Symfony\Component\CssSelector\Exception\SyntaxErrorException; use Symfony\Component\CssSelector\Node\FunctionNode; use Symfony\Component\CssSelector\Parser\Parser; use Symfony\Component\CssSelector\XPath\Translator; use Symfony\Component\CssSelector\XPath\XPathExpr; /** * XPath expression translator function extension. * * This component is a port of the Python cssselector library, * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect. * * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com> */ class FunctionExtension extends AbstractExtension { /** * {@inheritdoc} */ public function getFunctionTranslators() { return array( 'nth-child' => array($this, 'translateNthChild'), 'nth-last-child' => array($this, 'translateNthLastChild'), 'nth-of-type' => array($this, 'translateNthOfType'), 'nth-last-of-type' => array($this, 'translateNthLastOfType'), 'contains' => array($this, 'translateContains'), 'lang' => array($this, 'translateLang'), ); } /** * @param XPathExpr $xpath * @param FunctionNode $function * @param boolean $last * @param boolean $addNameTest * * @return XPathExpr * * @throws ExpressionErrorException */ public function translateNthChild(XPathExpr $xpath, FunctionNode $function, $last = false, $addNameTest = true) { try { list($a, $b) = Parser::parseSeries($function->getArguments()); } catch (SyntaxErrorException $e) { throw new ExpressionErrorException(sprintf('Invalid series: %s', implode(', ', $function->getArguments())), 0, $e); } $xpath->addStarPrefix(); if ($addNameTest) { $xpath->addNameTest(); } if (0 === $a) { return $xpath->addCondition('position() = '.($last ? 'last() - '.($b - 1) : $b)); } if ($a < 0) { if ($b < 1) { return $xpath->addCondition('false()'); } $sign = '<='; } else { $sign = '>='; } $expr = 'position()'; if ($last) { $expr = 'last() - '.$expr; $b--; } if (0 !== $b) { $expr .= ' - '.$b; } $conditions = array(sprintf('%s %s 0', $expr, $sign)); if (1 !== $a && -1 !== $a) { $conditions[] = sprintf('(%s) mod %d = 0', $expr, $a); } return $xpath->addCondition(implode(' and ', $conditions)); // todo: handle an+b, odd, even // an+b means every-a, plus b, e.g., 2n+1 means odd // 0n+b means b // n+0 means a=1, i.e., all elements // an means every a elements, i.e., 2n means even // -n means -1n // -1n+6 means elements 6 and previous } /** * @param XPathExpr $xpath * @param FunctionNode $function * * @return XPathExpr */ public function translateNthLastChild(XPathExpr $xpath, FunctionNode $function) { return $this->translateNthChild($xpath, $function, true); } /** * @param XPathExpr $xpath * @param FunctionNode $function * * @return XPathExpr */ public function translateNthOfType(XPathExpr $xpath, FunctionNode $function) { return $this->translateNthChild($xpath, $function, false, false); } /** * @param XPathExpr $xpath * @param FunctionNode $function * * @return XPathExpr * * @throws ExpressionErrorException */ public function translateNthLastOfType(XPathExpr $xpath, FunctionNode $function) { if ('*' === $xpath->getElement()) { throw new ExpressionErrorException('"*:nth-of-type()" is not implemented.'); } return $this->translateNthChild($xpath, $function, true, false); } /** * @param XPathExpr $xpath * @param FunctionNode $function * * @return XPathExpr * * @throws ExpressionErrorException */ public function translateContains(XPathExpr $xpath, FunctionNode $function) { $arguments = $function->getArguments(); foreach ($arguments as $token) { if (!($token->isString() || $token->isIdentifier())) { throw new ExpressionErrorException( 'Expected a single string or identifier for :contains(), got ' .implode(', ', $arguments) ); } } return $xpath->addCondition(sprintf( 'contains(string(.), %s)', Translator::getXpathLiteral($arguments[0]->getValue()) )); } /** * @param XPathExpr $xpath * @param FunctionNode $function * * @return XPathExpr * * @throws ExpressionErrorException */ public function translateLang(XPathExpr $xpath, FunctionNode $function) { $arguments = $function->getArguments(); foreach ($arguments as $token) { if (!($token->isString() || $token->isIdentifier())) { throw new ExpressionErrorException( 'Expected a single string or identifier for :lang(), got ' .implode(', ', $arguments) ); } } return $xpath->addCondition(sprintf( 'lang(%s)', Translator::getXpathLiteral($arguments[0]->getValue()) )); } /** * {@inheritdoc} */ public function getName() { return 'function'; } }
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