<?php

namespace MailPoetVendor\Sabberworm\CSS\Property;

if (!defined('ABSPATH')) exit;


/**
 * Class representing a single CSS selector. Selectors have to be split by the comma prior to being passed into this class.
 */
class Selector
{
    //Regexes for specificity calculations
    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';
    private $sSelector;
    private $iSpecificity;
    public function __construct($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;
    }
}
