Readd TagFinder service which was deleted accidentially.

src/Services/TagFinder.php

@@ -0,0 +1,117 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+namespace App\Services;
+
+use App\Entity\Parts\Part;
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Component\OptionsResolver\OptionsResolver;
+
+use function array_slice;
+
+/**
+ * A service related for searching for tags. Mostly useful for autocomplete reasons.
+ */
+class TagFinder
+{
+    protected $em;
+
+    public function __construct(EntityManagerInterface $entityManager)
+    {
+        $this->em = $entityManager;
+    }
+
+    /**
+     * Search tags that begins with the certain keyword.
+     *
+     * @param string $keyword The keyword the tag must begin with
+     * @param array  $options Some options specifying the search behavior. See configureOptions for possible options.
+     *
+     * @return string[] an array containing the tags that match the given keyword
+     */
+    public function searchTags(string $keyword, array $options = []): array
+    {
+        $results = [];
+        $keyword_regex = '/^'.preg_quote($keyword, '/').'/';
+
+        $resolver = new OptionsResolver();
+        $this->configureOptions($resolver);
+
+        $options = $resolver->resolve($options);
+
+        //If the keyword is too short we will get to much results, which takes too much time...
+        if (mb_strlen($keyword) < $options['min_keyword_length']) {
+            return [];
+        }
+
+        //Build a query to get all
+        $qb = $this->em->createQueryBuilder();
+
+        $qb->select('p.tags')
+            ->from(Part::class, 'p')
+            ->where('p.tags LIKE ?1')
+            ->setMaxResults($options['query_limit'])
+            //->orderBy('RAND()')
+            ->setParameter(1, '%'.$keyword.'%');
+
+        $possible_tags = $qb->getQuery()->getArrayResult();
+
+        //Iterate over each possible tags (which are comma separated) and extract tags which match our keyword
+        foreach ($possible_tags as $tags) {
+            $tags = explode(',', $tags['tags']);
+            $results = array_merge($results, preg_grep($keyword_regex, $tags));
+        }
+
+        $results = array_unique($results);
+        //Limit the returned tag count to specified value.
+        return array_slice($results, 0, $options['return_limit']);
+    }
+
+    protected function configureOptions(OptionsResolver $resolver): void
+    {
+        $resolver->setDefaults([
+            'query_limit' => 75,
+            'return_limit' => 75,
+            'min_keyword_length' => 2,
+        ]);
+    }
+}