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vendor/nelmio/api-doc-bundle/ModelDescriber/EnumModelDescriber.php

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+<?php
+
+namespace Nelmio\ApiDocBundle\ModelDescriber;
+
+use Nelmio\ApiDocBundle\Model\Model;
+use OpenApi\Annotations\Schema;
+use Symfony\Component\PropertyInfo\Type;
+
+class EnumModelDescriber implements ModelDescriberInterface
+{
+    public function describe(Model $model, Schema $schema)
+    {
+        $enumClass = $model->getType()->getClassName();
+
+        $enums = [];
+        foreach ($enumClass::cases() as $enumCase) {
+            $enums[] = $enumCase->value;
+        }
+
+        $reflectionEnum = new \ReflectionEnum($enumClass);
+        if ($reflectionEnum->isBacked() && 'int' === $reflectionEnum->getBackingType()->getName()) {
+            $schema->type = 'integer';
+        } else {
+            $schema->type = 'string';
+        }
+        $schema->enum = $enums;
+    }
+
+    public function supports(Model $model): bool
+    {
+        if (!function_exists('enum_exists')) {
+            return false;
+        }
+
+        return Type::BUILTIN_TYPE_OBJECT === $model->getType()->getBuiltinType()
+            && enum_exists($model->getType()->getClassName())
+            && is_subclass_of($model->getType()->getClassName(), \BackedEnum::class);
+    }
+}