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<?php namespace AmpProject\Optimizer; /** * CSS rule that provides semantic handling of media queries, selectors and properties. * * This is used in conjunction with CssRules for deduplication of CSS when adding styles during transformations. * * Note: This is a simplistic representation of CSS rules built for a specific purpose. * Make sure it supports a given use case before including in new code! * * @package ampproject/optimizer / final class CssRule { /* * Placeholder to use in the rule to denote an ID that has yet to be defined. * * Use applyId() to finalize the CSS rule. * * @var string. / const ID_PLACEHOLDER = '__ID__'; /* * Selector(s) to use for the CSS rule. * * @var string[] / private $selectors; /* * Properties to apply to the selector(s). * * @var string[] / private $properties; /* * Media query that wraps the CSS rule. * * @var string / private $mediaQuery = ''; /* * Rendered CSS cache. * * @var string\|null / private $renderedCss; /* * Byte count cache. * * @var int\|null / private $byteCount; /* * Instantiate a CssRule object. * * @param string\|string[] $selectors One or more selectors to use. * @param string\|string[] $properties One or more properties to apply to the selector(s). / public function __construct($selectors, $properties) { $this->selectors = array_values( array_unique( array_filter( array_map( [$this, 'normalizeSelector'], $this->separateSelectors($selectors) ) ) ) ); $this->properties = array_values( array_unique( array_filter( array_map( [$this, 'normalizeProperty'], $this->separateProperties($properties) ) ) ) ); sort($this->properties); } /* * Create a new CSS rule that is wrapped in a media query. * * @param string $mediaQuery Media query to wrap the CSS rule in. * @param string\|string[] $selectors One or more selectors to use. * @param string\|string[] $properties One or more properties to apply to the selector(s). * @return self CSS rule wrapped in a media query. / public static function withMediaQuery($mediaQuery, $selectors, $properties) { $cssRule = new self($selectors, $properties); $cssRule->mediaQuery = $mediaQuery; return $cssRule; } /* * Get the selector(s) for this CSS rule. * * @return string[] Selector(s) of the CSS rule. / public function getSelectors() { return $this->selectors; } /* * Get the properties for this CSS rule. * * @return string[] Properties of the CSS rule. / public function getProperties() { return $this->properties; } /* * Get the media query for this CSS rule. * * @return string Media query for the CSS rule or an empty string if none is set. / public function getMediaQuery() { return $this->mediaQuery; } /* * Get the CSS for this CSS rule. * * @return string CSS for this CSS rule. / public function getCss() { if ($this->renderedCss === null) { $selectors = implode(',', $this->selectors); $properties = implode( ';', array_map( static function ($property) { return trim($property, " \t\n\r\0\x0B;"); }, $this->properties ) ); if (empty($selectors) \|\| empty($properties)) { $this->renderedCss = ''; } else { $this->renderedCss = "{$selectors}{{$properties}}"; if (! empty($this->mediaQuery)) { $this->renderedCss = "{$this->mediaQuery}{{$this->renderedCss}}"; } } } return $this->renderedCss; } /* * Apply the provided ID across all ID placeholders. * * @param string $id ID to apply. * @return self / public function applyID($id) { $replacement_callback = static function ($css) use ($id) { return str_replace(self::ID_PLACEHOLDER, $id, $css); }; $this->selectors = array_map($replacement_callback, $this->selectors); $this->properties = array_map($replacement_callback, $this->properties); // Reset caches so they will need to be rebuilt. $this->renderedCss = null; $this->byteCount = null; return $this; } /* * Check if the CSS rule can be merged with another provided CSS rule. * * @param CssRule $that CSS rule to check against. * @return bool Whether the two CSS rules can be merged. / public function canBeMerged(CssRule $that) { if ($this->mediaQuery !== $that->mediaQuery) { return false; } if ( count($this->properties) !== count($that->properties) \|\| array_diff($this->properties, $that->properties) ) { return false; } return true; } /* * Merge this CSS rule with another CSS rule. * * This should only be done to same-properties rules within the same media query, * as the result will be wild otherwise. * * @param CssRule $that CSS rule to merge the current one with. * @return CssRule Merged Css rule. / public function mergeWith(CssRule $that) { $cssRule = new self( array_merge($this->selectors, $that->selectors), array_merge($this->properties, $that->properties) ); $cssRule->mediaQuery = $this->mediaQuery; return $cssRule; } /* * Get the byte count for the CSS rule. * * @return int Byte count of the CSS rule. / public function getByteCount() { if ($this->byteCount === null) { $this->byteCount = strlen($this->getCss()); } return $this->byteCount; } /* * Normalize a single selector. * * @param string $selector Selector to normalize. * @return string Normalized selector. / private function normalizeSelector($selector) { // Turn all series of whitespace into single spaces. $selector = preg_replace('/\s+/', ' ', $selector); // Remove spaces around selector qualifiers to keep properties compact. $selector = preg_replace('/ ?([>+~]) ?/', '$1', $selector); // Remove leading and trailing whitespace and commas. $selector = trim($selector, " \t\n\r\0\x0B;"); return $selector; } /* * Normalize single property. * * @param string $property Property to normalize. * @return string Normalized property. / private function normalizeProperty($property) { // Turn all series of whitespace into single spaces. $property = preg_replace('/\s+/', ' ', $property); // Remove spaces around colons and semicolons to keep properties compact. $property = preg_replace('/ ?([:;]) ?/', '$1', $property); // Deduplicate semicolons. $property = preg_replace('/([;]+)/', ';', $property); // Remove leading and trailing whitespace and semicolons. $property = trim($property, " \t\n\r\0\x0B;"); return $property; } /* * Separate selectors into individual values. * * @param string\|string[]\|array[] $selectors Selectors to separate. * @return string[] Separated selectors. / private function separateSelectors($selectors) { $separatedSelectors = []; foreach ((array)$selectors as $selectorString) { if (is_array($selectorString)) { $separatedSelectors = array_merge($separatedSelectors, $this->separateSelectors($selectorString)); } else { $separatedSelectors = array_merge($separatedSelectors, explode(',', $selectorString)); } } return $separatedSelectors; } /* * Separate properties into individual values. * * @param string\|string[]\|array[] $properties Properties to separate. * @return string[] Separated properties. */ private function separateProperties($properties) { $separatedProperties = []; foreach ((array)$properties as $propertyString) { if (is_array($propertyString)) { $separatedProperties = array_merge($separatedProperties, $this->separateProperties($propertyString)); } else { $separatedProperties = array_merge($separatedProperties, explode(';', $propertyString)); } } return $separatedProperties; } }

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