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Revision Autor Zeilennr. Zeile
365 lars 1 
<?php
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declare(strict_types=1);
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namespace PHPHtmlParser\Selector;
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/**
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 * This is the parser for the selector.
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 *
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 *
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 */
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class Parser implements ParserInterface
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{
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    /**
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     * Pattern of CSS selectors, modified from 'mootools'
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     *
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     * @var string
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     */
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    protected $pattern = "/([\w\-:\*>]*)(?:\#([\w\-]+)|\.([\w\.\-]+))?(?:\[@?(!?[\w\-:]+)(?:([!*^$]?=)[\"']?(.*?)[\"']?)?\])?([\/, ]+)/is";
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    /**
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     * Parses the selector string
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     *
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     * @param string $selector
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     *
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     * @return array
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     */
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    public function parseSelectorString(string $selector): array
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    {
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        $selectors = [];
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        $matches = [];
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        preg_match_all($this->pattern, trim($selector).' ', $matches, PREG_SET_ORDER);
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        // skip tbody
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        $result = [];
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        foreach ($matches as $match) {
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            // default values
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            $tag       = strtolower(trim($match[1]));
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            $operator  = '=';
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            $key       = null;
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            $value     = null;
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            $noKey     = false;
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            $alterNext = false;
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            // check for elements that alter the behavior of the next element
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            if ($tag == '>') {
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                $alterNext = true;
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            }
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            // check for id selector
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            if ( ! empty($match[2])) {
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                $key   = 'id';
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                $value = $match[2];
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            }
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            // check for class selector
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            if ( ! empty($match[3])) {
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                $key   = 'class';
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                $value = explode('.', $match[3]);
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            }
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            // and final attribute selector
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            if ( ! empty($match[4])) {
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                $key = strtolower($match[4]);
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            }
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            if ( ! empty($match[5])) {
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                $operator = $match[5];
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            }
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            if ( ! empty($match[6])) {
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                $value = $match[6];
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                if (strpos($value, '][') !== false) {
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                    // we have multiple type selectors
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                    $keys = [];
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                    $keys[] = $key;
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                    $key = $keys;
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                    $parts = explode('][', $value);
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                    $value = [];
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                    foreach ($parts as $part) {
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                        if (strpos($part, '=') !== false) {
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                            list($first, $second) = explode('=', $part);
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                            $key[] = $first;
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                            $value[] = $second;
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                        } else {
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                            $value[] = $part;
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                        }
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                    }
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                }
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            }
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            // check for elements that do not have a specified attribute
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            if (is_string($key) && isset($key[0]) && $key[0] == '!') {
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                $key   = substr($key, 1);
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                $noKey = true;
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            }
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            $result[] = [
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                'tag'       => $tag,
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                'key'       => $key,
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                'value'     => $value,
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                'operator'  => $operator,
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                'noKey'     => $noKey,
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                'alterNext' => $alterNext,
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            ];
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            if (isset($match[7]) && is_string($match[7]) && trim($match[7]) == ',') {
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                $selectors[] = $result;
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                $result      = [];
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            }
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        }
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        // save last results
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        if (count($result) > 0) {
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            $selectors[] = $result;
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        }
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        return $selectors;
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    }
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}