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