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Edit File: Selector.php

<?php
namespace MailPoetVendor\Sabberworm\CSS\Property;
if (!defined('ABSPATH')) exit;
class Selector
{
 const NON_ID_ATTRIBUTES_AND_PSEUDO_CLASSES_RX = '/
 (\\.[\\w]+) # classes
 |
 \\[(\\w+) # attributes
 |
 (\\:( # pseudo classes
 link|visited|active
 |hover|focus
 |lang
 |target
 |enabled|disabled|checked|indeterminate
 |root
 |nth-child|nth-last-child|nth-of-type|nth-last-of-type
 |first-child|last-child|first-of-type|last-of-type
 |only-child|only-of-type
 |empty|contains
 ))
 /ix';
 const ELEMENTS_AND_PSEUDO_ELEMENTS_RX = '/
 ((^|[\\s\\+\\>\\~]+)[\\w]+ # elements
 |
 \\:{1,2}( # pseudo-elements
 after|before|first-letter|first-line|selection
 ))
 /ix';
 const SELECTOR_VALIDATION_RX = '/
 ^(
 (?:
 [a-zA-Z0-9\\x{00A0}-\\x{FFFF}_^$|*="\'~\\[\\]()\\-\\s\\.:#+>]* # any sequence of valid unescaped characters
 (?:\\\\.)? # a single escaped character
 (?:([\'"]).*?(?<!\\\\)\\2)? # a quoted text like [id="example"]
 )*
 )$
 /ux';
 private $sSelector;
 private $iSpecificity;
 public static function isValid($sSelector)
 {
 return \preg_match(static::SELECTOR_VALIDATION_RX, $sSelector);
 }
 public function __construct($sSelector, $bCalculateSpecificity = \false)
 {
 $this->setSelector($sSelector);
 if ($bCalculateSpecificity) {
 $this->getSpecificity();
 }
 }
 public function getSelector()
 {
 return $this->sSelector;
 }
 public function setSelector($sSelector)
 {
 $this->sSelector = \trim($sSelector);
 $this->iSpecificity = null;
 }
 public function __toString()
 {
 return $this->getSelector();
 }
 public function getSpecificity()
 {
 if ($this->iSpecificity === null) {
 $a = 0;
 /// @todo should exclude \# as well as "#"
 $aMatches = null;
 $b = \substr_count($this->sSelector, '#');
 $c = \preg_match_all(self::NON_ID_ATTRIBUTES_AND_PSEUDO_CLASSES_RX, $this->sSelector, $aMatches);
 $d = \preg_match_all(self::ELEMENTS_AND_PSEUDO_ELEMENTS_RX, $this->sSelector, $aMatches);
 $this->iSpecificity = $a * 1000 + $b * 100 + $c * 10 + $d;
 }
 return $this->iSpecificity;
 }
}

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