<?php

namespace Sabberworm\CSS\Property;

/**
 * Class representing a single CSS selector. Selectors have to be split by the comma prior to being passed into this
 * class.
 */
class Selector
{
    /**
     * regexp for specificity calculations
     *
     * @var string
     */
    const NON_ID_ATTRIBUTES_AND_PSEUDO_CLASSES_RX = "/\n        (\.[\w]+)                   # classes\n        |\n        \[(\w+)                     # attributes\n        |\n        (\:(                        # pseudo classes\n            link|visited|active\n            |hover|focus\n            |lang\n            |target\n            |enabled|disabled|checked|indeterminate\n            |root\n            |nth-child|nth-last-child|nth-of-type|nth-last-of-type\n            |first-child|last-child|first-of-type|last-of-type\n            |only-child|only-of-type\n            |empty|contains\n        ))\n        /ix";

    /**
     * regexp for specificity calculations
     *
     * @var string
     */
    const ELEMENTS_AND_PSEUDO_ELEMENTS_RX = "/\n        ((^|[\s\+\>\~]+)[\w]+   # elements\n        |\n        \:{1,2}(                # pseudo-elements\n            after|before|first-letter|first-line|selection\n        ))\n        /ix";

    /**
     * regexp for specificity calculations
     *
     * @var string
     */
    const SELECTOR_VALIDATION_RX = "/\n        ^(\n            (?:\n                [a-zA-Z0-9\x{00A0}-\x{FFFF}_^$|*="'~\[\]()\-\s\.:#+>]* # any sequence of valid unescaped characters\n                (?:\\.)?                                              # a single escaped character\n                (?:(['"]).*?(?<!\\)\2)?                              # a quoted text like [id="example"]\n            )*\n        )$\n        /ux";

    /** @var string */
    private $sSelector;

    /** @var int|null */
    private $iSpecificity;

    /**
     * @param string $sSelector
     *
     * @return bool
     */
    public static function isValid($sSelector)
    {
        return preg_match(static::SELECTOR_VALIDATION_RX, $sSelector);
    }

    /**
     * @param string $sSelector
     * @param bool $bCalculateSpecificity
     */
    public function __construct($sSelector, $bCalculateSpecificity = false)
    {
        $this->setSelector($sSelector);
        if ($bCalculateSpecificity) {
            $this->getSpecificity();
        }
    }

    /**
     * @return string
     */
    public function getSelector()
    {
        return $this->sSelector;
    }

    /**
     * @param string $sSelector
     *
     * @return void
     */
    public function setSelector($sSelector)
    {
        $this->sSelector = trim($sSelector);
        $this->iSpecificity = null;
    }

    /**
     * @return string
     */
    public function __toString()
    {
        return $this->getSelector();
    }

    /**
     * @return int
     */
    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;
    }
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----ODk4OTMzODM4OTYzNjgxIDI2OTU1NDgxMDcyNzAzMTMgMTcyNzMxMTg5OTQzNjI2OA==