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FunctionExtension() WC 1.0

XPath expression translator function extension.

This component is a port of the Python cssselect library, which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.

Хуков нет.

Возвращает

Null. Ничего.

Использование

$FunctionExtension = new FunctionExtension();
// use class methods

Методы

  1. getFunctionTranslators()
  2. getName()
  3. translateContains(XPathExpr $xpath, FunctionNode $function)
  4. translateLang(XPathExpr $xpath, FunctionNode $function)
  5. translateNthChild(XPathExpr $xpath, FunctionNode $function, $last = false, $addNameTest = true)
  6. translateNthLastChild(XPathExpr $xpath, FunctionNode $function)
  7. translateNthLastOfType(XPathExpr $xpath, FunctionNode $function)
  8. translateNthOfType(XPathExpr $xpath, FunctionNode $function)

Код FunctionExtension: woocommerce/vendor/symfony/css-selector/XPath/Extension/FunctionExtension.php WC 4.3.2

<?php
class FunctionExtension extends AbstractExtension
{
    /**
     * {@inheritdoc}
     */
    public function getFunctionTranslators()
    {
        return [
            'nth-child' => [$this, 'translateNthChild'],
            'nth-last-child' => [$this, 'translateNthLastChild'],
            'nth-of-type' => [$this, 'translateNthOfType'],
            'nth-last-of-type' => [$this, 'translateNthLastOfType'],
            'contains' => [$this, 'translateContains'],
            'lang' => [$this, 'translateLang'],
        ];
    }

    /**
     * @param bool $last
     * @param bool $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 = [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
    }

    /**
     * @return XPathExpr
     */
    public function translateNthLastChild(XPathExpr $xpath, FunctionNode $function)
    {
        return $this->translateNthChild($xpath, $function, true);
    }

    /**
     * @return XPathExpr
     */
    public function translateNthOfType(XPathExpr $xpath, FunctionNode $function)
    {
        return $this->translateNthChild($xpath, $function, false, false);
    }

    /**
     * @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);
    }

    /**
     * @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())
        ));
    }

    /**
     * @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';
    }
}