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<?php |
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|
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class Minify_LessCssSource extends Minify_Source |
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{ |
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/** |
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* @var Minify_CacheInterface |
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*/ |
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private $cache; |
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|
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/** |
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* Parsed lessphp cache object |
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* |
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* @var array |
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*/ |
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private $parsed; |
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|
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/** |
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* @inheritdoc |
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*/ |
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public function __construct(array $spec, Minify_CacheInterface $cache) |
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{ |
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parent::__construct($spec); |
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|
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$this->cache = $cache; |
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} |
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|
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/** |
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* Get last modified of all parsed files |
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* |
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* @return int |
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*/ |
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public function getLastModified() |
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{ |
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$cache = $this->getCache(); |
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|
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return $cache['lastModified']; |
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} |
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|
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/** |
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* Get content |
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* |
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* @return string |
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*/ |
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public function getContent() |
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{ |
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$cache = $this->getCache(); |
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|
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return $cache['compiled']; |
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} |
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|
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/** |
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* Get lessphp cache object |
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* |
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* @return array |
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*/ |
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private function getCache() |
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{ |
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// cache for single run |
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// so that getLastModified and getContent in single request do not add additional cache roundtrips (i.e memcache) |
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if (isset($this->parsed)) { |
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return $this->parsed; |
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} |
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|
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// check from cache first |
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$cache = null; |
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$cacheId = $this->getCacheId(); |
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if ($this->cache->isValid($cacheId, 0)) { |
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if ($cache = $this->cache->fetch($cacheId)) { |
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$cache = unserialize($cache); |
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} |
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} |
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|
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$less = $this->getCompiler(); |
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$input = $cache ? $cache : $this->filepath; |
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$cache = $less->cachedCompile($input); |
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|
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if (!is_array($input) || $cache['updated'] > $input['updated']) { |
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$cache['lastModified'] = $this->getMaxLastModified($cache); |
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$this->cache->store($cacheId, serialize($cache)); |
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} |
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|
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return $this->parsed = $cache; |
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} |
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|
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/** |
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* Calculate maximum last modified of all files, |
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* as the 'updated' timestamp in cache is not the same as file last modified timestamp: |
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* @link https://github.com/leafo/lessphp/blob/v0.4.0/lessc.inc.php#L1904 |
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* @return int |
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*/ |
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private function getMaxLastModified($cache) |
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{ |
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$lastModified = 0; |
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foreach ($cache['files'] as $mtime) { |
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$lastModified = max($lastModified, $mtime); |
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} |
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|
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return $lastModified; |
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} |
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|
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/** |
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* Make a unique cache id for for this source. |
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* |
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* @param string $prefix |
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* |
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* @return string |
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*/ |
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private function getCacheId($prefix = 'minify') |
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{ |
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$md5 = md5($this->filepath); |
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|
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return "{$prefix}_less2_{$md5}"; |
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} |
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|
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/** |
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* Get instance of less compiler |
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* |
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* @return lessc |
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*/ |
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private function getCompiler() |
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{ |
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$less = new lessc(); |
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// do not spend CPU time letting less doing minify |
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$less->setPreserveComments(true); |
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|
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return $less; |
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} |
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} |
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|
