[FEATURE] Add interface utility, includes function to get constants

Classes/Utility/InterfaceUtility.php

@@ -0,0 +1,40 @@
+<?php
+namespace Cjel\TemplatesAide\Utility;
+
+/***
+ *
+ * This file is part of the "Templates Aide" Extension for TYPO3 CMS.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.txt file that was distributed with this source code.
+ *
+ *  (c) 2021 Philipp Dieter <philipp.dieter@attic-media.net>
+ *
+ ***/
+
+use TYPO3\CMS\Extbase\Utility\LocalizationUtility;
+
+/**
+ *
+ */
+class InterfaceUtility
+{
+
+    /**
+     * Get all interface constants per prefix
+     */
+    public static function parseInterfaceConstants(
+        $interfaceClass, $prefix
+    ) {
+        $constants = (new \ReflectionClass($interfaceClass))
+            ->getConstants();
+        $constants = array_filter($constants, function($key) use ($prefix) {
+            if (substr($key, 0, strlen($prefix) + 1)
+                == strtoupper($prefix) . '_'
+            ) {
+                return true;
+            }
+        }, ARRAY_FILTER_USE_KEY);
+        return array_values($constants);
+    }
+}