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Editing: Parser.php

<?php

declare(strict_types=1);

namespace PHPHtmlParser\Selector;

/**
 * This is the parser for the selector.
 *
 * 
 */
class Parser implements ParserInterface
{

/**
     * Pattern of CSS selectors, modified from 'mootools'
     *
     * @var string
     */
    protected $pattern = "/([\w\-:\*>]*)(?:\#([\w\-]+)|\.([\w\.\-]+))?(?:\[@?(!?[\w\-:]+)(?:([!*^$]?=)[\"']?(.*?)[\"']?)?\])?([\/, ]+)/is";

/**
     * Parses the selector string
     *
     * @param string $selector
     *
     * @return array
     */
    public function parseSelectorString(string $selector): array
    {
        $selectors = [];

$matches = [];
        preg_match_all($this->pattern, trim($selector).' ', $matches, PREG_SET_ORDER);

// skip tbody
        $result = [];
        foreach ($matches as $match) {
            // default values
            $tag       = strtolower(trim($match[1]));
            $operator  = '=';
            $key       = null;
            $value     = null;
            $noKey     = false;
            $alterNext = false;

// check for elements that alter the behavior of the next element
            if ($tag == '>') {
                $alterNext = true;
            }

// check for id selector
            if ( ! empty($match[2])) {
                $key   = 'id';
                $value = $match[2];
            }

// check for class selector
            if ( ! empty($match[3])) {
                $key   = 'class';
                $value = explode('.', $match[3]);
            }

// and final attribute selector
            if ( ! empty($match[4])) {
                $key = strtolower($match[4]);
            }
            if ( ! empty($match[5])) {
                $operator = $match[5];
            }
            if ( ! empty($match[6])) {
                $value = $match[6];
                if (strpos($value, '][') !== false) {
                    // we have multiple type selectors
                    $keys = [];
                    $keys[] = $key;
                    $key = $keys;
                    $parts = explode('][', $value);
                    $value = [];
                    foreach ($parts as $part) {
                        if (strpos($part, '=') !== false) {
                            list($first, $second) = explode('=', $part);
                            $key[] = $first;
                            $value[] = $second;
                        } else {
                            $value[] = $part;
                        }
                    }
                }
            }

// check for elements that do not have a specified attribute
            if (is_string($key) && isset($key[0]) && $key[0] == '!') {
                $key   = substr($key, 1);
                $noKey = true;
            }

$result[] = [
                'tag'       => $tag,
                'key'       => $key,
                'value'     => $value,
                'operator'  => $operator,
                'noKey'     => $noKey,
                'alterNext' => $alterNext,
            ];
            if (isset($match[7]) && is_string($match[7]) && trim($match[7]) == ',') {
                $selectors[] = $result;
                $result      = [];
            }
        }

// save last results
        if (count($result) > 0) {
            $selectors[] = $result;
        }

return $selectors;
    }
}

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