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<?php |
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declare(strict_types=1); |
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namespace ReliqArts\StyleImporter\CSS\Generator; |
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use Exception; |
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use ReliqArts\StyleImporter\CSS\Exception\RulesetGenerationFailed; |
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use ReliqArts\StyleImporter\CSS\Generator; |
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use ReliqArts\StyleImporter\CSS\Rule\Rule; |
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use ReliqArts\StyleImporter\CSS\Rules; |
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use ReliqArts\StyleImporter\CSS\Ruleset; |
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use ReliqArts\StyleImporter\CSS\Util\Sanitizer; |
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final class RuleSetGenerator implements Generator |
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{ |
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private const RULE_PATTERN_TEMPLATE = '(?<selector>[^}{,]*%s%s[\s:.,][^{,]*)[^{]*\{(?<properties>[^}]++)\}'; |
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private const DELIMITED_RULE_PATTERN_TEMPLATE = '%s' . self::RULE_PATTERN_TEMPLATE . '%s'; |
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private const PATTERN_DELIMITER = '/'; |
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private const PRE_TAG_CHARACTER_SET = '\s'; |
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private const PRE_CLASS_OR_ID_CHARACTER_SET = '[\s\w]'; |
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private const MATCH_GROUP_KEY_SELECTOR = 1; |
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private const MATCH_GROUP_KEY_PROPERTIES = 2; |
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/** |
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* @param Context $context |
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* |
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* @throws RulesetGenerationFailed |
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* |
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* @return Ruleset |
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*/ |
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public function generate(Context $context): Ruleset |
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{ |
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$htmlElements = $context->getHtmlElements(); |
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try { |
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$rules = array_merge( |
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$context->getImportRules(), |
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$context->getFontFaceRules(), |
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$this->getRulesForElements($htmlElements, $context->getSanitizedStyles()) |
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); |
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foreach ($context->getMediaBlocks() as $mediaBlock) { |
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$mediaBlockRules = $this->getRulesForElements( |
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$htmlElements, |
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$mediaBlock->getStyles(), |
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$mediaBlock->getMediaQuery() |
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); |
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if (!empty($mediaBlockRules)) { |
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array_push($rules, ...$mediaBlockRules); |
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} |
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} |
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return new Rules($rules); |
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} catch (Exception $exception) { |
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throw new RulesetGenerationFailed( |
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sprintf('Failed to generate rules. %s', $exception->getMessage()), |
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$exception->getCode(), |
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$exception |
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); |
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} |
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} |
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/** |
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* @param string[] $htmlElements |
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* @param string $styles |
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* @param string $mediaQuery |
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* |
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* @return Rule[] |
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*/ |
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private function getRulesForElements(array $htmlElements, string $styles, string $mediaQuery = ''): array |
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{ |
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$rules = []; |
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foreach ($htmlElements as $element) { |
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$sanitizedElement = Sanitizer::sanitizeElementName($element); |
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$preElementCharacterSet = $this->getElementPreCharacterSet($element); |
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$pattern = sprintf( |
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self::DELIMITED_RULE_PATTERN_TEMPLATE, |
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self::PATTERN_DELIMITER, |
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$preElementCharacterSet, |
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$sanitizedElement, |
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self::PATTERN_DELIMITER |
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); |
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$matchCount = preg_match_all($pattern, $styles, $matches); |
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if (empty($matchCount)) { |
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continue; |
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} |
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$selectors = $matches[self::MATCH_GROUP_KEY_SELECTOR]; |
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$properties = $matches[self::MATCH_GROUP_KEY_PROPERTIES]; |
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foreach ($selectors as $index => $selector) { |
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$rule = Rule::createNormalized( |
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$selector, |
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$properties[$index], |
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$mediaQuery |
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); |
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if (!in_array($rule, $rules, true)) { |
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$rules[] = $rule; |
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} |
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} |
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} |
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return array_unique($rules); |
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} |
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/** |
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* @param string $element |
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* |
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* @return string |
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*/ |
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private function getElementPreCharacterSet(string $element): string |
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{ |
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if (in_array($element[0], ['.', '#'], true)) { |
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return self::PRE_CLASS_OR_ID_CHARACTER_SET; |
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} |
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return self::PRE_TAG_CHARACTER_SET; |
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} |
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} |
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reliqarts /
laravel-style-importer
