Add synonym feature for date search

Allow configuration of synonyms via TypoScript.
This is taken into account when searching dates via submitted demand.

The configuration looks like the following:

    plugin.tx_events {
        settings {
            synonyms {
                10 {
                    word = Stadtführung
                    synonyms = Tour, Stadtführungen, Führung
                }
            }
        }
    }

The 10, 11, … is necessary as umlauts won't work as keys.
So `synonyms.Stadtführung = Tour, Stadtführungen` will not work.

Relates: #9158

Classes/Controller/DateController.php

@@ -161,6 +161,8 @@ class DateController extends ActionController
         if ($this->request->hasArgument('searchword') && $this->request->getArgument('searchword') != '')
             $demand->setSearchword((string)$this->request->getArgument('searchword'));
 
+        $demand->setSynonyms($this->settings['synonyms'] ?? []);
+
         if ($this->request->hasArgument('start') && $this->request->getArgument('start') != '')
             $demand->setStart(strtotime($this->request->getArgument('start') . ' 00:00'));
 

Classes/Domain/Model/Dto/DateDemand.php

@@ -2,6 +2,8 @@
 
 namespace Wrm\Events\Domain\Model\Dto;
 
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+
 class DateDemand {
 
     /**
@@ -59,6 +61,15 @@ class DateDemand {
      */
     protected $searchword = '';
 
+    /**
+     * @var array
+     *
+     * Synonym1 => ['word1', 'word2', …],
+     * Synonym2 => ['word3', 'word4', …],
+     * …
+     */
+    protected $synonyms = [];
+
     /**
      * @var bool
      */
@@ -208,6 +219,39 @@ class DateDemand {
         $this->searchword = $searchword;
     }
 
+    /**
+     * @param array $synonyms
+     * [
+     *  [
+     *   'word' => 'Word1',
+     *   'synonyms' => 'synonym1, synonym2',
+     *  ],
+     *  [
+     *   'word' => 'Word2',
+     *   'synonyms' => 'synonym3, synonym4',
+     *  ],
+     *  …
+     * ]
+     */
+    public function setSynonyms(array $synonyms): void
+    {
+        $this->synonyms = [];
+        foreach ($synonyms as $config) {
+            $synonymsForWord = GeneralUtility::trimExplode(',', $config['synonyms'], true);
+            foreach ($synonymsForWord as $synonym) {
+                $synonym = mb_strtolower($synonym);
+                $this->synonyms[$synonym][] = $config['word'];
+                $this->synonyms[$synonym] = array_unique($this->synonyms[$synonym]);
+            }
+        }
+    }
+
+    public function getSynonymsForSearchword(): array
+    {
+        $searchWord = mb_strtolower($this->getSearchword());
+        return $this->synonyms[$searchWord] ?? [];
+    }
+
     /**
      * @return string
      */

Classes/Domain/Repository/DateRepository.php

@@ -1,6 +1,7 @@
 <?php
 namespace Wrm\Events\Domain\Repository;
 
+use TYPO3\CMS\Extbase\Persistence\Generic\Qom\ConstraintInterface;
 use Wrm\Events\Domain\Model\Dto\DateDemand;
 use Wrm\Events\Service\CategoryService;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
@@ -70,12 +71,7 @@ class DateRepository extends \TYPO3\CMS\Extbase\Persistence\Repository
         }
 
         if ($demand->getSearchword() !== '') {
-            $constraints['searchword'] = $query->logicalOr(
-                [
-                    $query->like('event.title', '%' . $demand->getSearchword() . '%'),
-                    $query->like('event.teaser', '%' . $demand->getSearchword() . '%')
-                ]
-            );
+            $constraints['searchword'] = $this->getSearchwordConstraint($query, $demand);
         }
 
         if ($demand->getStart() !== '' && $demand->getEnd() != '') {
@@ -103,6 +99,31 @@ class DateRepository extends \TYPO3\CMS\Extbase\Persistence\Repository
         return $query;
     }
 
+    private function getSearchwordConstraint(
+        QueryInterface $query,
+        DateDemand $demand
+    ): ConstraintInterface {
+        $fieldsToSearch = [
+            'event.title',
+            'event.teaser',
+        ];
+
+        $wordsToSearch = $demand->getSynonymsForSearchword();
+        $wordsToSearch[] = $demand->getSearchword();
+        $constraints = [];
+
+        $queryBuilder = $this->objectManager->get(ConnectionPool::class)
+            ->getQueryBuilderForTable('tx_events_domain_model_date');
+
+        foreach ($wordsToSearch as $word) {
+            foreach ($fieldsToSearch as $field) {
+                $constraints[] = $query->like($field, '%' . $queryBuilder->escapeLikeWildcards($word) . '%');
+            }
+        }
+
+        return $query->logicalOr($constraints);
+    }
+
     /**
      * @param QueryInterface $query
      * @param string $categories