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<?php |
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|
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namespace Sabberworm\CSS\Property; |
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|
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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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* @internal |
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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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/** |
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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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* @internal |
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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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/** |
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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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* @internal since 8.5.2 |
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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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/** |
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* @var string |
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*/ |
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private $sSelector; |
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|
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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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/** |
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* @param string $sSelector |
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* |
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* @return bool |
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* |
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* @internal since V8.8.0 |
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*/ |
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public static function isValid($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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/** |
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* @param string $sSelector |
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* @param bool $bCalculateSpecificity @deprecated since V8.8.0, will be removed in V9.0.0 |
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*/ |
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public function __construct($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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/** |
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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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/** |
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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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/** |
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* @return string |
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* |
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* @deprecated in V8.8.0, will be removed in V9.0.0. Use `render` instead. |
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*/ |
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public function __toString() |
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{ |
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return $this->getSelector(); |
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} |
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|
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/** |
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* @return int |
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*/ |
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public function getSpecificity() |
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{ |
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if ($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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} |
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|
