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<?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 {
//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;
}
}
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