Feature/json schema improvements

src/Illuminate/JsonSchema/Types/StringType.php

@@ -19,6 +19,11 @@ class StringType extends Type
      */
     protected ?string $pattern = null;
 
+    /**
+     * The format of the string.
+     */
+    protected ?string $format = null;
+
     /**
      * Set the minimum length (inclusive).
      */
@@ -49,6 +54,18 @@ public function pattern(string $value): static
         return $this;
     }
 
+    /**
+     * Set the format of the string.
+     *
+     * {@link https://json-schema.org/understanding-json-schema/reference/type#built-in-formats}
+     */
+    public function format(string $value): static
+    {
+        $this->format = $value;
+
+        return $this;
+    }
+
     /**
      * Set the type's default value.
      */

src/Illuminate/JsonSchema/Types/Type.php

@@ -2,8 +2,10 @@
 
 namespace Illuminate\JsonSchema\Types;
 
+use BackedEnum;
 use Illuminate\JsonSchema\JsonSchema;
 use Illuminate\JsonSchema\Serializer;
+use InvalidArgumentException;
 
 abstract class Type extends JsonSchema
 {
@@ -86,11 +88,19 @@ public function description(string $value): static
     /**
      * Restrict the value to one of the provided enumerated values.
      *
-     * @param  array<int, mixed>  $values
+     * @param  class-string<\BackedEnum>|array<int, mixed>  $values
      */
-    public function enum(array $values): static
+    public function enum(array|string $values): static
     {
-        // Keep order and allow complex values (arrays/objects) without forcing uniqueness...
+        if (is_string($values)) {
+            if (! is_subclass_of($values, BackedEnum::class)) {
+                throw new InvalidArgumentException('The provided class must be a BackedEnum.');
+            }
+
+            $values = array_column($values::cases(), 'value');
+        }
+
+        // Keep order and allow complex values (arrays / objects) without forcing uniqueness...
         $this->enum = array_values($values);
 
         return $this;

tests/JsonSchema/Fixtures/Enums/IntBackedEnum.php

@@ -0,0 +1,9 @@
+<?php
+
+namespace Illuminate\Tests\JsonSchema\Fixtures\Enums;
+
+enum IntBackedEnum: int
+{
+    case One = 1;
+    case Two = 2;
+}

tests/JsonSchema/Fixtures/Enums/StringBackedEnum.php

@@ -0,0 +1,9 @@
+<?php
+
+namespace Illuminate\Tests\JsonSchema\Fixtures\Enums;
+
+enum StringBackedEnum: string
+{
+    case One = 'one';
+    case Two = 'two';
+}

tests/JsonSchema/Fixtures/Enums/UnitEnum.php

@@ -0,0 +1,9 @@
+<?php
+
+namespace Illuminate\Tests\JsonSchema\Fixtures\Enums;
+
+enum UnitEnum
+{
+    case One;
+    case Two;
+}

tests/JsonSchema/StringTypeTest.php

@@ -39,6 +39,17 @@ public function test_it_sets_pattern()
         ], $type->toArray());
     }
 
+    public function test_it_sets_format()
+    {
+        $type = (new StringType)->default('foo')->format('date');
+
+        $this->assertEquals([
+            'type' => 'string',
+            'default' => 'foo',
+            'format' => 'date',
+        ], $type->toArray());
+    }
+
     public function test_it_sets_enum()
     {
         $type = (new StringType)->enum(['draft', 'published']);

tests/JsonSchema/TypeTest.php

@@ -3,12 +3,17 @@
 namespace Illuminate\Tests\JsonSchema;
 
 use Illuminate\JsonSchema\JsonSchema;
+use Illuminate\Tests\JsonSchema\Fixtures\Enums\IntBackedEnum;
+use Illuminate\Tests\JsonSchema\Fixtures\Enums\StringBackedEnum;
+use Illuminate\Tests\JsonSchema\Fixtures\Enums\UnitEnum;
+use InvalidArgumentException;
 use Opis\JsonSchema\Resolvers\SchemaResolver;
 use Opis\JsonSchema\SchemaLoader;
 use Opis\JsonSchema\Validator;
 use Opis\Uri\Uri;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
+use stdClass;
 use Stringable;
 
 class TypeTest extends TestCase
@@ -102,6 +107,33 @@ public function test_types_in_object_schema(): void
         $this->assertInstanceOf(JsonSchema::class, $schema);
     }
 
+    public function test_throws_with_invalid_enum_string(): void
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('The provided class must be a BackedEnum.');
+        $this->expectExceptionCode(0);
+
+        JsonSchema::string()->enum('NonExistentEnumClass');
+    }
+
+    public function test_throws_with_not_an_enum_class(): void
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('The provided class must be a BackedEnum.');
+        $this->expectExceptionCode(0);
+
+        JsonSchema::string()->enum(stdClass::class);
+    }
+
+    public function test_throws_with_unit_enum_class(): void
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('The provided class must be a BackedEnum.');
+        $this->expectExceptionCode(0);
+
+        JsonSchema::string()->enum(UnitEnum::class);
+    }
+
     public static function validSchemasProvider(): array
     {
         return [
@@ -118,6 +150,7 @@ public static function validSchemasProvider(): array
             [JsonSchema::string()->min(1)->max(3), 'a'], // boundary at min
             [JsonSchema::string()->pattern('^[A-Z]{2}[0-9]{2}$'), 'AB12'], // complex pattern
             [JsonSchema::string()->enum(['', 'x', 'y']), ''], // enum including empty string
+            [JsonSchema::string()->enum(StringBackedEnum::class), 'one'], // string backed enum cases
             [JsonSchema::string()->nullable(), null],
             [JsonSchema::string()->nullable(false), ''],
 
@@ -132,6 +165,7 @@ public static function validSchemasProvider(): array
             [JsonSchema::integer()->max(10), 9], // below max
             [JsonSchema::integer()->min(1)->max(3), 3], // boundary at max
             [JsonSchema::integer()->enum([0, -1, 5]), 0], // enum with zero
+            [JsonSchema::integer()->enum(IntBackedEnum::class), 1], // integer backed enum cases
             [JsonSchema::integer()->default(0), 0], // default value
             [JsonSchema::integer()->nullable(), null],
             [JsonSchema::integer()->nullable(false), 0],
@@ -265,6 +299,7 @@ public static function invalidSchemasProvider(): array
             [JsonSchema::string()->max(0), 'a'], // too long for zero max
             [JsonSchema::string()->pattern('^[a]+$'), 'ab'], // pattern mismatch
             [JsonSchema::string()->enum(['a', 'b']), 'A'], // case sensitive mismatch
+            [JsonSchema::string()->enum(StringBackedEnum::class), 'three'], // string backed enum cases mismatch
             [JsonSchema::string(), null], // null not allowed
             [JsonSchema::string()->nullable(false), null], // not nullable
 
@@ -279,6 +314,7 @@ public static function invalidSchemasProvider(): array
             [JsonSchema::integer()->max(0), 1], // above max boundary
             [JsonSchema::integer(), 3.14], // not an integer
             [JsonSchema::integer()->enum([1, 2]), 2.5], // not in enum and not an integer
+            [JsonSchema::integer()->enum(IntBackedEnum::class), 3], // integer backed enum cases mismatch
             [JsonSchema::integer()->default(1), null], // wrong type
             [JsonSchema::integer()->nullable(false), null], // not nullable