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