feat(mapper): allow mapping value to object via cast method

src/Tempest/Mapper/src/Mappers/ArrayToObjectMapper.php → src/Tempest/Mapper/src/Mappers/MixedToObjectMapper.php

@@ -15,7 +15,7 @@
 use Throwable;
 use function Tempest\Support\arr;
 
-final readonly class ArrayToObjectMapper implements Mapper
+final readonly class MixedToObjectMapper implements Mapper
 {
     public function __construct(
         private CasterFactory $casterFactory,
@@ -24,14 +24,10 @@ public function __construct(
 
     public function canMap(mixed $from, mixed $to): bool
     {
-        if (! is_array($from)) {
-            return false;
-        }
-
         try {
             $class = new ClassReflector($to);
 
-            return $class->isInstantiable();
+            return $class->isInstantiable() || $class->hasMethod('cast');
         } catch (Throwable) {
             return false;
         }
@@ -47,10 +43,14 @@ public function map(mixed $from, mixed $to): object
         /** @var PropertyReflector[] $unsetProperties */
         $unsetProperties = [];
 
-        $from = arr($from)->unwrap()->toArray();
-
         $isStrictClass = $class->hasAttribute(Strict::class);
 
+        if ($class->hasMethod('cast')) {
+            return $class->getName()::cast($from);
+        }
+
+        $from = arr($from)->unwrap()->toArray();
+
         foreach ($class->getPublicProperties() as $property) {
             if ($property->isVirtual()) {
                 continue;
@@ -136,6 +136,10 @@ private function resolveValueFromType(
             return new UnknownValue();
         }
 
+        if ($type->asClass()->hasMethod('cast')) {
+            return $type->getName()::cast($data);
+        }
+
         $caster = $this->casterFactory->forProperty($property);
 
         if (! is_array($data)) {

src/Tempest/Mapper/tests/Mappers/MixedToObjectMapperTest.php

@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tempest\Mapper\Tests\Mappers;
+
+use PHPUnit\Framework\TestCase;
+use Tempest\Mapper\Casters\CasterFactory;
+use Tempest\Mapper\Mappers\MixedToObjectMapper;
+use Tempest\Mapper\Tests\Support\StringCastValue;
+use Tempest\Mapper\Tests\Support\StringValue;
+
+/**
+ * @internal
+ */
+final class MixedToObjectMapperTest extends TestCase
+{
+    private MixedToObjectMapper $subject;
+
+    protected function setUp(): void
+    {
+        $this->subject = new MixedToObjectMapper(new CasterFactory());
+    }
+
+    public function test_map_array_to_object(): void
+    {
+        $value = ['value' => 'Tempest'];
+
+        /** @var StringValue $object */
+        $object = $this->subject->map($value, StringValue::class);
+
+        $this->assertEquals('Tempest', $object->getValue());
+    }
+
+    public function test_map_string_to_object_with_automatic_cast(): void
+    {
+        $value = 'Tempest';
+
+        /** @var StringCastValue $object */
+        $object = $this->subject->map($value, StringCastValue::class);
+
+        $this->assertEquals('Tempest', $object->getValue());
+    }
+}

src/Tempest/Mapper/tests/Support/StringCastValue.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tempest\Mapper\Tests\Support;
+
+final readonly class StringCastValue
+{
+    private function __construct(private string $value)
+    {
+    }
+
+    public function getValue(): string
+    {
+        return $this->value;
+    }
+
+    public static function cast(string $value): self
+    {
+        return new self($value);
+    }
+}

src/Tempest/Mapper/tests/Support/StringValue.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tempest\Mapper\Tests\Support;
+
+final readonly class StringValue
+{
+    public function __construct(public string $value)
+    {
+    }
+
+    public function getValue(): string
+    {
+        return $this->value;
+    }
+}

src/Tempest/Reflection/src/ClassReflector.php

@@ -127,6 +127,11 @@ public function getMethod(string $name): MethodReflector
         return new MethodReflector($this->reflectionClass->getMethod($name));
     }
 
+    public function hasMethod(string $name): bool
+    {
+        return $this->reflectionClass->hasMethod($name);
+    }
+
     public function isInstantiable(): bool
     {
         return $this->reflectionClass->isInstantiable();

src/Tempest/Reflection/tests/ClassReflectorTest.php

@@ -60,4 +60,12 @@ public function test_recursive_attribute_from_parent(): void
         $this->assertNull($reflector->getAttribute(RecursiveAttribute::class));
         $this->assertNotNull($reflector->getAttribute(RecursiveAttribute::class, recursive: true));
     }
+
+    public function test_has_method(): void
+    {
+        $reflector = new ClassReflector(TestClassB::class);
+        $reflection = new ReflectionClass(TestClassB::class);
+
+        $this->assertTrue($reflector->hasMethod('getName'));
+    }
 }

src/Tempest/Reflection/tests/Fixtures/TestClassB.php

@@ -10,4 +10,9 @@ public function __construct(
         public ?string $name,
     ) {
     }
+
+    public function getName(): string
+    {
+        return $this->name;
+    }
 }

tests/Integration/Mapper/ObjectFactoryTest.php

@@ -6,7 +6,7 @@
 
 use Tempest\Mapper\Exceptions\CannotMapDataException;
 use Tempest\Mapper\Mappers\ArrayToJsonMapper;
-use Tempest\Mapper\Mappers\ArrayToObjectMapper;
+use Tempest\Mapper\Mappers\MixedToObjectMapper;
 use Tempest\Mapper\Mappers\ObjectToArrayMapper;
 use Tempest\Mapper\ObjectFactory;
 use Tests\Tempest\Integration\FrameworkIntegrationTestCase;
@@ -77,7 +77,7 @@ public function test_cannot_map_exception(): void
     public function test_map_with(): void
     {
         $result = map(['a' => 'a', 'b' => 'b'])->with(
-            fn (ArrayToObjectMapper $mapper, mixed $from) => $mapper->map($from, ObjectA::class),
+            fn (MixedToObjectMapper $mapper, mixed $from) => $mapper->map($from, ObjectA::class),
             ObjectToArrayMapper::class,
             ArrayToJsonMapper::class,
         );