128 lines
2.8 KiB
PHP
128 lines
2.8 KiB
PHP
<?php
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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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* 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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* @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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$this->cache = $cache;
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}
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/**
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* Get last modified of all parsed files
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*
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* @return int
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*/
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public function getLastModified()
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{
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$cache = $this->getCache();
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return $cache['lastModified'];
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}
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/**
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* Get content
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*
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* @return string
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*/
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public function getContent()
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{
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$cache = $this->getCache();
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return $cache['compiled'];
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}
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/**
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* Get lessphp cache object
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*
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* @return array
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*/
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private function getCache()
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{
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// cache for single run
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// so that getLastModified and getContent in single request do not add additional cache roundtrips (i.e memcache)
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if (isset($this->parsed)) {
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return $this->parsed;
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}
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// check from cache first
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$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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$less = $this->getCompiler();
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$input = $cache ? $cache : $this->filepath;
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$cache = $less->cachedCompile($input);
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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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return $this->parsed = $cache;
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}
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/**
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* Calculate maximum last modified of all files,
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* as the 'updated' timestamp in cache is not the same as file last modified timestamp:
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* @link https://github.com/leafo/lessphp/blob/v0.4.0/lessc.inc.php#L1904
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* @return int
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*/
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private function getMaxLastModified($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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return $lastModified;
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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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return "{$prefix}_less2_{$md5}";
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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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return $less;
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}
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}
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