vendor/sabberworm/php-css-parser/lib/Sabberworm/CSS/Property/Selector.php

   1 <?php
   2
   3 namespace Sabberworm\CSS\Property;
   4
   5 /**
   6  * Class representing a single CSS selector. Selectors have to be split by the comma prior to being passed into this class.
   7  */
   8 class Selector {
   9
  10         //Regexes for specificity calculations
  11         const NON_ID_ATTRIBUTES_AND_PSEUDO_CLASSES_RX = '/
  12         (\.[\w]+)                   # classes
  13         |
  14         \[(\w+)                     # attributes
  15         |
  16         (\:(                        # pseudo classes
  17                 link|visited|active
  18                 |hover|focus
  19                 |lang
  20                 |target
  21                 |enabled|disabled|checked|indeterminate
  22                 |root
  23                 |nth-child|nth-last-child|nth-of-type|nth-last-of-type
  24                 |first-child|last-child|first-of-type|last-of-type
  25                 |only-child|only-of-type
  26                 |empty|contains
  27         ))
  28         /ix';
  29
  30         const ELEMENTS_AND_PSEUDO_ELEMENTS_RX = '/
  31         ((^|[\s\+\>\~]+)[\w]+   # elements
  32         |
  33         \:{1,2}(                # pseudo-elements
  34                 after|before|first-letter|first-line|selection
  35         ))
  36         /ix';
  37
  38         private $sSelector;
  39         private $iSpecificity;
  40
  41         public function __construct($sSelector, $bCalculateSpecificity = false) {
  42                 $this->setSelector($sSelector);
  43                 if ($bCalculateSpecificity) {
  44                         $this->getSpecificity();
  45                 }
  46         }
  47
  48         public function getSelector() {
  49                 return $this->sSelector;
  50         }
  51
  52         public function setSelector($sSelector) {
  53                 $this->sSelector = trim($sSelector);
  54                 $this->iSpecificity = null;
  55         }
  56
  57         public function __toString() {
  58                 return $this->getSelector();
  59         }
  60
  61         public function getSpecificity() {
  62                 if ($this->iSpecificity === null) {
  63                         $a = 0;
  64                         /// @todo should exclude \# as well as "#"
  65                         $aMatches = null;
  66                         $b = substr_count($this->sSelector, '#');
  67                         $c = preg_match_all(self::NON_ID_ATTRIBUTES_AND_PSEUDO_CLASSES_RX, $this->sSelector, $aMatches);
  68                         $d = preg_match_all(self::ELEMENTS_AND_PSEUDO_ELEMENTS_RX, $this->sSelector, $aMatches);
  69                         $this->iSpecificity = ($a * 1000) + ($b * 100) + ($c * 10) + $d;
  70                 }
  71                 return $this->iSpecificity;
  72         }
  73
  74 }