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vendor/tijsverkoyen/css-to-inline-styles/src/Css/Rule/Processor.php
vendored
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163
vendor/tijsverkoyen/css-to-inline-styles/src/Css/Rule/Processor.php
vendored
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<?php
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namespace TijsVerkoyen\CssToInlineStyles\Css\Rule;
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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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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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return (array) explode('}', $rulesString);
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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('|/\*.*?\*/|', '', $string);
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$string = preg_replace('/\s\s+/', ' ', $string);
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$string = trim($string);
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$string = rtrim($string, '}');
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return $string;
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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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$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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foreach ($selectors as $selector) {
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$selector = trim($selector);
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$specificity = $this->calculateSpecificityBasedOnASelector($selector);
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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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return $rules;
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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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$idSelectorsPattern = " \#";
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$classAttributesPseudoClassesSelectorsPattern = " (\.[\w]+) # classes
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\[(\w+) # attributes
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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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$typePseudoElementsSelectorPattern = " ((^|[\s\+\>\~]+)[\w]+ # elements
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\:{1,2}( # pseudo-elements
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after|before
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|first-letter|first-line
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|selection
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)
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)";
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return new Specificity(
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preg_match_all("/{$idSelectorsPattern}/ix", $selector, $matches),
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preg_match_all("/{$classAttributesPseudoClassesSelectorsPattern}/ix", $selector, $matches),
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preg_match_all("/{$typePseudoElementsSelectorPattern}/ix", $selector, $matches)
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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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return $objects;
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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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// 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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return $value;
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}
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}
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