Initial Drupal 11 with DDEV setup

vendor/symfony/validator/Constraints/LanguageValidator.php

@@ -0,0 +1,50 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Validator\Constraints;
+
+use Symfony\Component\Intl\Languages;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+use Symfony\Component\Validator\Exception\UnexpectedValueException;
+
+/**
+ * Validates whether a value is a valid language code.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+class LanguageValidator extends ConstraintValidator
+{
+    public function validate(mixed $value, Constraint $constraint): void
+    {
+        if (!$constraint instanceof Language) {
+            throw new UnexpectedTypeException($constraint, Language::class);
+        }
+
+        if (null === $value || '' === $value) {
+            return;
+        }
+
+        if (!\is_scalar($value) && !$value instanceof \Stringable) {
+            throw new UnexpectedValueException($value, 'string');
+        }
+
+        $value = (string) $value;
+
+        if ($constraint->alpha3 ? !Languages::alpha3CodeExists($value) : !Languages::exists($value)) {
+            $this->context->buildViolation($constraint->message)
+                ->setParameter('{{ value }}', $this->formatValue($value))
+                ->setCode(Language::NO_SUCH_LANGUAGE_ERROR)
+                ->addViolation();
+        }
+    }
+}