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