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|
<?php
use Leafo\ScssPhp\Compiler;
use Leafo\ScssPhp\Server;
use Leafo\ScssPhp\Version;
/**
* Class for using SCSS files
*
* @link https://github.com/leafo/scssphp/
*/
class Minify_ScssCssSource extends Minify_Source
{
/**
* @var Minify_CacheInterface
*/
private $cache;
/**
* Parsed SCSS cache object
*
* @var array
*/
private $parsed;
/**
* @inheritdoc
*/
public function __construct(array $spec, Minify_CacheInterface $cache)
{
parent::__construct($spec);
$this->cache = $cache;
}
/**
* Get last modified of all parsed files
*
* @return int
*/
public function getLastModified()
{
$cache = $this->getCache();
return $cache['updated'];
}
/**
* Get content
*
* @return string
*/
public function getContent()
{
$cache = $this->getCache();
return $cache['content'];
}
/**
* Make a unique cache id for for this source.
*
* @param string $prefix
*
* @return string
*/
private function getCacheId($prefix = 'minify')
{
$md5 = md5($this->filepath);
return "{$prefix}_scss_{$md5}";
}
/**
* 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;
}
// check from cache first
$cache = null;
$cacheId = $this->getCacheId();
if ($this->cache->isValid($cacheId, 0)) {
if ($cache = $this->cache->fetch($cacheId)) {
$cache = unserialize($cache);
}
}
$input = $cache ? $cache : $this->filepath;
if ($this->cacheIsStale($cache)) {
$cache = $this->compile($this->filepath);
}
if (!is_array($input) || $cache['updated'] > $input['updated']) {
$this->cache->store($cacheId, serialize($cache));
}
return $this->parsed = $cache;
}
/**
* Determine whether .scss file needs to be re-compiled.
*
* @param array $cache Cache object
*
* @return boolean True if compile required.
*/
private function cacheIsStale($cache)
{
if (!$cache) {
return true;
}
$updated = $cache['updated'];
foreach ($cache['files'] as $import => $mtime) {
$filemtime = filemtime($import);
if ($filemtime !== $mtime || $filemtime > $updated) {
return true;
}
}
return false;
}
/**
* 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();
// set import path directory the input filename resides
// otherwise @import statements will not find the files
// and will treat the @import line as css import
$scss->setImportPaths(dirname($filename));
$css = $scss->compile(file_get_contents($filename), $filename);
$elapsed = round((microtime(true) - $start), 4);
$v = Version::VERSION;
$ts = date('r', $start);
$css = "/* compiled by scssphp $v on $ts (${elapsed}s) */\n\n" . $css;
$imports = $scss->getParsedFiles();
$updated = 0;
foreach ($imports as $mtime) {
$updated = max($updated, $mtime);
}
return array(
'elapsed' => $elapsed, // statistic, can be dropped
'updated' => $updated,
'content' => $css,
'files' => $imports,
);
}
}
|
