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<?php
/**
* Matomo - free/libre analytics platform
*
* @link https://matomo.org
* @license https://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*
* @method static \Piwik\AssetManager\UIAssetMinifier getInstance()
*/
namespace Piwik\AssetManager;
use Exception;
use JShrink\Minifier;
use Piwik\Singleton;
class UIAssetMinifier extends Singleton
{
public const MINIFIED_JS_RATIO = 100;
protected function __construct()
{
self::validateDependency();
parent::__construct();
}
/**
* Indicates if the provided JavaScript content has already been minified or not.
* The heuristic is based on a custom ratio : (size of file) / (number of lines).
* The threshold (100) has been found empirically on existing files :
* - the ratio never exceeds 50 for non-minified content and
* - it never goes under 150 for minified content.
*
* @param string $content Contents of the JavaScript file
* @return boolean
*/
public function isMinifiedJs($content)
{
$lineCount = substr_count($content, "\n");
if ($lineCount == 0) {
return true;
}
$contentSize = strlen($content);
$ratio = $contentSize / $lineCount;
return $ratio > self::MINIFIED_JS_RATIO;
}
/**
* @param string $content
* @return string
*/
public function minifyJs($content)
{
return Minifier::minify($content);
}
private static function validateDependency()
{
if (!class_exists("JShrink\\Minifier")) {
throw new Exception("JShrink could not be found, maybe you are using Matomo from git and need to update Composer. $ php composer.phar update");
}
}
}
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