function Parser::parseSeries

Parses the arguments for ":nth-child()" and friends.

Parameters

Token[] $tokens:

Throws

SyntaxErrorException

1 call to Parser::parseSeries()

FunctionExtension::translateNthChild in vendor/symfony/css-selector/XPath/Extension/FunctionExtension.php

File

vendor/symfony/css-selector/Parser/Parser.php, line 52

Class

Parser

CSS selector parser.

Namespace

Symfony\Component\CssSelector\Parser

Code

public static function parseSeries(array $tokens) : array {
    foreach ($tokens as $token) {
        if ($token->isString()) {
            throw SyntaxErrorException::stringAsFunctionArgument();
        }
    }
    $joined = trim(implode('', array_map(fn(Token $token) => $token->getValue(), $tokens)));
    $int = function ($string) {
        if (!is_numeric($string)) {
            throw SyntaxErrorException::stringAsFunctionArgument();
        }
        return (int) $string;
    };
    switch (true) {
        case 'odd' === $joined:
            return [
                2,
                1,
            ];
        case 'even' === $joined:
            return [
                2,
                0,
            ];
        case 'n' === $joined:
            return [
                1,
                0,
            ];
        case !str_contains($joined, 'n'):
            return [
                0,
                $int($joined),
            ];
    }
    $split = explode('n', $joined);
    $first = $split[0] ?? null;
    return [
        $first ? '-' === $first || '+' === $first ? $int($first . '1') : $int($first) : 1,
        isset($split[1]) && $split[1] ? $int($split[1]) : 0,
    ];
}