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74 lines
1.8 KiB
74 lines
1.8 KiB
<?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 class.
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*/
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class Selector {
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//Regexes for specificity calculations
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const NON_ID_ATTRIBUTES_AND_PSEUDO_CLASSES_RX = '/
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(\.[\w]+) # classes
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\[(\w+) # attributes
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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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const ELEMENTS_AND_PSEUDO_ELEMENTS_RX = '/
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((^|[\s\+\>\~]+)[\w]+ # elements
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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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private $sSelector;
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private $iSpecificity;
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public function __construct($sSelector, $bCalculateSpecificity = false) {
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$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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public function getSelector() {
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return $this->sSelector;
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}
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public function setSelector($sSelector) {
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$this->sSelector = trim($sSelector);
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$this->iSpecificity = null;
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}
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public function __toString() {
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return $this->getSelector();
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}
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public function getSpecificity() {
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if ($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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