Jarves\AssetHandler\CssHandler::getTags PHP Method

    public function getTags(array $assetsInfo = array(), $concatenation = false)
    {
        $tags = [];
        if ($concatenation) {
            $filesToCompress = [];
            foreach ($assetsInfo as $asset) {
                if ($asset->getPath()) {
                    // load css files, that are not accessible (means those point to a controller)
                    // because those can't be compressed
                    $localPath = $this->getAssetPath($asset->getPath());
                    if (!file_exists($localPath)) {
                        $tags[] = $this->getTag($asset);
                        continue;
                    }
                }
                if ($asset->getContent()) {
                    // load inline assets because we can't compress those
                    $tags[] = $this->getTag($asset);
                    continue;
                }
                if (!$asset->isCompressionAllowed()) {
                    $tags[] = $this->getTag($asset);
                    continue;
                }
                $filesToCompress[] = $asset->getPath();
            }
            if ($filesToCompress) {
                $tags[] = $this->getTag($this->compressFiles($filesToCompress));
            }
        } else {
            foreach ($assetsInfo as $asset) {
                $tags[] = $this->getTag($asset);
            }
        }
        return implode("\n", $tags);
    }