Selector.php
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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
{
/**
* regexp for specificity calculations
*
* @var string
*/
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';
/**
* regexp for specificity calculations
*
* @var string
*/
const ELEMENTS_AND_PSEUDO_ELEMENTS_RX = '/
((^|[\s\+\>\~]+)[\w]+ # elements
|
\:{1,2}( # pseudo-elements
after|before|first-letter|first-line|selection
))
/ix';
/**
* regexp for specificity calculations
*
* @var string
*/
const SELECTOR_VALIDATION_RX = '/
^(
(?:
[a-zA-Z0-9\x{00A0}-\x{FFFF}_^$|*="\'~\[\]()\-\s\.:#+>]* # any sequence of valid unescaped characters
(?:\\\\.)? # a single escaped character
(?:([\'"]).*?(?<!\\\\)\2)? # a quoted text like [id="example"]
)*
)$
/ux';
/**
* @var string
*/
private $sSelector;
/**
* @var int|null
*/
private $iSpecificity;
/**
* @param string $sSelector
*
* @return bool
*/
public static function isValid($sSelector)
{
return preg_match(static::SELECTOR_VALIDATION_RX, $sSelector);
}
/**
* @param string $sSelector
* @param bool $bCalculateSpecificity
*/
public function __construct($sSelector, $bCalculateSpecificity = false)
{
$this->setSelector($sSelector);
if ($bCalculateSpecificity) {
$this->getSpecificity();
}
}
/**
* @return string
*/
public function getSelector()
{
return $this->sSelector;
}
/**
* @param string $sSelector
*
* @return void
*/
public function setSelector($sSelector)
{
$this->sSelector = trim($sSelector);
$this->iSpecificity = null;
}
/**
* @return string
*/
public function __toString()
{
return $this->getSelector();
}
/**
* @return int
*/
public function getSpecificity()
{
if ($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;
}
}