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<?php
namespace Assets;
use Assets;
use StudipCacheFactory;
/**
* LESS Compiler for assets.
*
* Uses less.php by wikimedia <https://github.com/wikimedia/less.php>.
*
* @author Jan-Hendrik Willms <tleilax+studip@gmail.com>
* @license GPL2 or any later version
* @since Stud.IP 4.4
*/
class LESSCompiler implements Compiler
{
const CACHE_KEY = '/assets/less-prefix';
private static $instance = null;
/**
* Returns an instance of the compiler
* @return Assets\LESSCompiler instance
*/
public static function getInstance()
{
if (self::$instance === null) {
self::$instance = new self();
}
return self::$instance;
}
/**
* Private constructor to enforce singleton.
*/
private function __construct()
{
}
/**
* Compiles a less string. This method will add all neccessary imports
* and variables for Stud.IP so almost all mixins and variables of the
* core system can be used. This includes colors and icons.
*
* @param string $input LESS content to compile
* @param array $variables Additional variables for the LESS compilation
* @return string containing the generated CSS
*/
public function compile($input, array $variables = []): string
{
$less = $this->getPrefix() . $input;
$variables['image-path'] = '"' . Assets::url('images') . '"';
$parser = new \Less_Parser([
'strictMath' => true,
'compress' => \Studip\ENV === 'production',
'sourceMap' => \Studip\ENV !== 'production',
]);
$parser->SetImportDirs(["{$GLOBALS['STUDIP_BASE_PATH']}/resources/" => '']);
$parser->ModifyVars($variables);
$parser->parse($less);
return $parser->getCSS();
}
/**
* Generates the less prefix containing the variables and mixins of the
* Stud.IP core system.
* This prefix will be cached in Stud.IP's cache in order to minimize
* disk accesses.
*
* @return String containing the neccessary prefix
*/
private function getPrefix()
{
$cache = StudipCacheFactory::getCache();
$prefix = $cache->read(self::CACHE_KEY);
if ($prefix === false) {
$prefix = '';
// Load mixins and change relative to absolute filenames
$mixin_file = $GLOBALS['STUDIP_BASE_PATH'] . '/resources/assets/stylesheets/mixins.less';
foreach (file($mixin_file) as $mixin) {
if (!preg_match('/@import(.*?) "(.*)";/', $mixin, $match)) {
continue;
}
$core_file = "{$GLOBALS['STUDIP_BASE_PATH']}/resources/assets/stylesheets/{$match[2]}";
$prefix .= sprintf('@import%s "%s";' . "\n", $match[1], $core_file);
}
// Add adjusted image paths
$prefix .= sprintf('@image-path: "%s";', Assets::url('images')) . "\n";
$prefix .= '@icon-path: "@{image-path}/icons/16";' . "\n";
$cache->write(self::CACHE_KEY, $prefix);
}
return $prefix;
}
}
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