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<?php |
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|
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namespace TijsVerkoyen\CssToInlineStyles\Css\Rule; |
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|
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use Symfony\Component\CssSelector\Node\Specificity; |
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use \TijsVerkoyen\CssToInlineStyles\Css\Property\Processor as PropertyProcessor; |
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|
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class Processor |
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{ |
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/** |
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* Splits a string into separate rules |
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* |
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* @param string $rulesString |
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* |
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* @return string[] |
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*/ |
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public function splitIntoSeparateRules($rulesString) |
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{ |
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$rulesString = $this->cleanup($rulesString); |
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|
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return (array) explode('}', $rulesString); |
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} |
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|
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/** |
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* @param string $string |
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* |
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* @return string |
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*/ |
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private function cleanup($string) |
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{ |
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$string = str_replace(array("\r", "\n"), '', $string); |
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$string = str_replace(array("\t"), ' ', $string); |
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$string = str_replace('"', '\'', $string); |
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$string = preg_replace('|/\*.*?\*/|', '', $string) ?? $string; |
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$string = preg_replace('/\s\s+/', ' ', $string) ?? $string; |
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|
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$string = trim($string); |
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$string = rtrim($string, '}'); |
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|
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return $string; |
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} |
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|
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/** |
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* Converts a rule-string into an object |
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* |
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* @param string $rule |
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* @param int $originalOrder |
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* |
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* @return Rule[] |
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*/ |
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public function convertToObjects($rule, $originalOrder) |
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{ |
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$rule = $this->cleanup($rule); |
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|
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$chunks = explode('{', $rule); |
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if (!isset($chunks[1])) { |
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return array(); |
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} |
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$propertiesProcessor = new PropertyProcessor(); |
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$rules = array(); |
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$selectors = (array) explode(',', trim($chunks[0])); |
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$properties = $propertiesProcessor->splitIntoSeparateProperties($chunks[1]); |
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|
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foreach ($selectors as $selector) { |
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$selector = trim($selector); |
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$specificity = $this->calculateSpecificityBasedOnASelector($selector); |
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|
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$rules[] = new Rule( |
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$selector, |
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$propertiesProcessor->convertArrayToObjects($properties, $specificity), |
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$specificity, |
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$originalOrder |
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); |
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} |
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|
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return $rules; |
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} |
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|
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/** |
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* Calculates 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 $selector |
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* |
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* @return Specificity |
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*/ |
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public function calculateSpecificityBasedOnASelector($selector) |
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{ |
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$idSelectorCount = preg_match_all("/ \#/ix", $selector, $matches); |
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$classAttributesPseudoClassesSelectorsPattern = " (\.[\w]+) # classes |
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| |
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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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$classAttributesPseudoClassesSelectorCount = preg_match_all("/{$classAttributesPseudoClassesSelectorsPattern}/ix", $selector, $matches); |
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|
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$typePseudoElementsSelectorPattern = " ((^|[\s\+\>\~]+)[\w]+ # elements |
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| |
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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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$typePseudoElementsSelectorCount = preg_match_all("/{$typePseudoElementsSelectorPattern}/ix", $selector, $matches); |
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|
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if ($idSelectorCount === false || $classAttributesPseudoClassesSelectorCount === false || $typePseudoElementsSelectorCount === false) { |
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throw new \RuntimeException('Failed to calculate specificity based on selector.'); |
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} |
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|
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return new Specificity( |
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$idSelectorCount, |
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$classAttributesPseudoClassesSelectorCount, |
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$typePseudoElementsSelectorCount |
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); |
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} |
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|
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/** |
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* @param string[] $rules |
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* @param Rule[] $objects |
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* |
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* @return Rule[] |
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*/ |
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public function convertArrayToObjects(array $rules, array $objects = array()) |
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{ |
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$order = 1; |
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foreach ($rules as $rule) { |
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$objects = array_merge($objects, $this->convertToObjects($rule, $order)); |
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$order++; |
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} |
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|
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return $objects; |
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} |
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|
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/** |
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* Sorts an array on the specificity element in an ascending way |
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* Lower specificity will be sorted to the beginning of the array |
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* |
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* @param Rule $e1 The first element. |
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* @param Rule $e2 The second element. |
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* |
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* @return int |
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*/ |
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public static function sortOnSpecificity(Rule $e1, Rule $e2) |
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{ |
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$e1Specificity = $e1->getSpecificity(); |
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$value = $e1Specificity->compareTo($e2->getSpecificity()); |
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|
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// if the specificity is the same, use the order in which the element appeared |
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if ($value === 0) { |
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$value = $e1->getOrder() - $e2->getOrder(); |
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} |
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|
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return $value; |
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} |
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} |
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|
