Specificity.php
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<?php
namespace TijsVerkoyen\CssToInlineStyles;
/**
* CSS to Inline Styles Specificity class.
*
* Compare specificity based on the CSS3 spec.
*
* @see http://www.w3.org/TR/selectors/#specificity
*
*/
class Specificity
{
/**
* The number of ID selectors in the selector
*
* @var int
*/
private $a;
/**
*
* The number of class selectors, attributes selectors, and pseudo-classes in the selector
*
* @var int
*/
private $b;
/**
* The number of type selectors and pseudo-elements in the selector
*
* @var int
*/
private $c;
/**
* @param int $a The number of ID selectors in the selector
* @param int $b The number of class selectors, attributes selectors, and pseudo-classes in the selector
* @param int $c The number of type selectors and pseudo-elements in the selector
*/
public function __construct($a = 0, $b = 0, $c = 0)
{
$this->a = $a;
$this->b = $b;
$this->c = $c;
}
/**
* Increase the current specificity by adding the three values
*
* @param int $a The number of ID selectors in the selector
* @param int $b The number of class selectors, attributes selectors, and pseudo-classes in the selector
* @param int $c The number of type selectors and pseudo-elements in the selector
*/
public function increase($a, $b, $c)
{
$this->a += $a;
$this->b += $b;
$this->c += $c;
}
/**
* Get the specificity values as an array
*
* @return array
*/
public function getValues()
{
return array($this->a, $this->b, $this->c);
}
/**
* Calculate the specificity based on a CSS Selector string,
* Based on the patterns from premailer/css_parser by Alex Dunae
*
* @see https://github.com/premailer/css_parser/blob/master/lib/css_parser/regexps.rb
* @param string $selector
* @return static
*/
public static function fromSelector($selector)
{
$pattern_a = " \#";
$pattern_b = " (\.[\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
))";
$pattern_c = " ((^|[\s\+\>\~]+)[\w]+ # elements
|
\:{1,2}( # pseudo-elements
after|before
|first-letter|first-line
|selection
)
)";
return new static(
preg_match_all("/{$pattern_a}/ix", $selector, $matches),
preg_match_all("/{$pattern_b}/ix", $selector, $matches),
preg_match_all("/{$pattern_c}/ix", $selector, $matches)
);
}
/**
* Returns <0 when $specificity is greater, 0 when equal, >0 when smaller
*
* @param Specificity $specificity
* @return int
*/
public function compareTo(Specificity $specificity)
{
if ($this->a !== $specificity->a) {
return $this->a - $specificity->a;
} elseif ($this->b !== $specificity->b) {
return $this->b - $specificity->b;
} else {
return $this->c - $specificity->c;
}
}
}