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<?php | ||
use Leafo\ScssPhp\Compiler; | ||
use Leafo\ScssPhp\Server; | ||
use Leafo\ScssPhp\Version; | ||
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/** | ||
* Class for using SCSS files | ||
* | ||
* @link https://github.com/leafo/scssphp/ | ||
*/ | ||
class Minify_ScssCssSource extends Minify_Source { | ||
/** | ||
* @var Minify_CacheInterface | ||
*/ | ||
private $cache; | ||
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/** | ||
* Parsed SCSS cache object | ||
* | ||
* @var array | ||
*/ | ||
private $parsed; | ||
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/** | ||
* @inheritdoc | ||
*/ | ||
public function __construct(array $spec, Minify_CacheInterface $cache) | ||
{ | ||
parent::__construct($spec); | ||
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$this->cache = $cache; | ||
} | ||
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/** | ||
* Get last modified of all parsed files | ||
* | ||
* @return int | ||
*/ | ||
public function getLastModified() | ||
{ | ||
$cache = $this->getCache(); | ||
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return $cache['updated']; | ||
} | ||
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/** | ||
* Get content | ||
* | ||
* @return string | ||
*/ | ||
public function getContent() | ||
{ | ||
$cache = $this->getCache(); | ||
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return $cache['content']; | ||
} | ||
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/** | ||
* Make a unique cache id for for this source. | ||
* | ||
* @param string $prefix | ||
* | ||
* @return string | ||
*/ | ||
private function getCacheId($prefix = 'minify') | ||
{ | ||
$md5 = md5($this->filepath); | ||
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return "{$prefix}_scss_{$md5}"; | ||
} | ||
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/** | ||
* Get SCSS cache object | ||
* | ||
* Runs the compilation if needed | ||
* | ||
* Implements Leafo\ScssPhp\Server logic because we need to get parsed files without parsing actual content | ||
* | ||
* @return array | ||
*/ | ||
private function getCache() | ||
{ | ||
// cache for single run | ||
// so that getLastModified and getContent in single request do not add additional cache roundtrips (i.e memcache) | ||
if (isset($this->parsed)) { | ||
return $this->parsed; | ||
} | ||
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// check from cache first | ||
$cache = null; | ||
$cacheId = $this->getCacheId(); | ||
if ($this->cache->isValid($cacheId, 0)) { | ||
if ($cache = $this->cache->fetch($cacheId)) { | ||
$cache = unserialize($cache); | ||
} | ||
} | ||
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$input = $cache ? $cache : $this->filepath; | ||
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if ($this->cacheIsStale($cache)) { | ||
$cache = $this->compile($this->filepath); | ||
} | ||
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if (!is_array($input) || $cache['updated'] > $input['updated']) { | ||
$this->cache->store($cacheId, serialize($cache)); | ||
} | ||
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return $this->parsed = $cache; | ||
} | ||
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/** | ||
* Determine whether .scss file needs to be re-compiled. | ||
* | ||
* @param array $cache Cache object | ||
* | ||
* @return boolean True if compile required. | ||
*/ | ||
public function cacheIsStale($cache) | ||
{ | ||
if (!$cache) { | ||
return true; | ||
} | ||
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$updated = $cache['updated']; | ||
foreach ($cache['files'] as $import => $mtime) { | ||
$filemtime = filemtime($import); | ||
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if ($filemtime !== $mtime || $filemtime > $updated) { | ||
return true; | ||
} | ||
} | ||
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return false; | ||
} | ||
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/** | ||
* Compile .scss file | ||
* | ||
* @param string $filename Input path (.scss) | ||
* | ||
* @see Server::compile() | ||
* @return array meta data result of the compile | ||
*/ | ||
private function compile($filename) | ||
{ | ||
$start = microtime(true); | ||
$scss = new Compiler(); | ||
$css = $scss->compile(file_get_contents($filename), $filename); | ||
$elapsed = round((microtime(true) - $start), 4); | ||
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$v = Version::VERSION; | ||
$ts = date('r', $start); | ||
$css = "/* compiled by scssphp $v on $ts (${elapsed}s) */\n\n" . $css; | ||
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$imports = $scss->getParsedFiles(); | ||
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$updated = 0; | ||
foreach ($imports as $mtime) { | ||
$updated = max($updated, $mtime); | ||
} | ||
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return array( | ||
'elapsed' => $elapsed, // statistic, can be dropped | ||
'updated' => $updated, | ||
'content' => $css, | ||
'files' => $imports, | ||
); | ||
} | ||
} |
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