ClassShortener.php

<?php

namespace Drupal\webprofiler\Helper;

use Drupal\Component\Render\FormattableMarkup;

/**
 * Class ClassShortener
 */
class ClassShortener implements ClassShortenerInterface {
    
    /**
     * {@inheritdoc}
     */
    public function shortenClass($class) {
        $parts = explode('\\', $class);
        $result = [];
        $size = count($parts) - 1;
        foreach ($parts as $key => $part) {
            if ($key < $size) {
                $result[] = substr($part, 0, 1);
            }
            else {
                $result[] = $part;
            }
        }
        return new FormattableMarkup("<abbr title=\"@class\">@short</abbr>", [
            '@class' => $class,
            '@short' => implode('\\', $result),
        ]);
    }

}