BelgiumPostCode form type

composer.json

@@ -37,6 +37,7 @@
     "doctrine/doctrine-bundle": "^2.13",
     "doctrine/orm": "^3.3",
     "symfony/doctrine-messenger": "^7.3",
+    "symfony/intl": "^7.3",
     "symfony/ux-toggle-password": "^2.22"
   },
   "require-dev": {

config/services.php

@@ -2,10 +2,10 @@
 
 declare(strict_types=1);
 
-use SumoCoders\FrameworkCoreBundle\Command\SecretsGetCommand;
 use SumoCoders\FrameworkCoreBundle\Command\TranslateCommand;
 use SumoCoders\FrameworkCoreBundle\DoctrineListener\DoctrineAuditListener;
 use SumoCoders\FrameworkCoreBundle\EventListener\TitleListener;
+use SumoCoders\FrameworkCoreBundle\Form\Type\BelgiumPostCodeType;
 use SumoCoders\FrameworkCoreBundle\Logger\AuditLogger;
 use SumoCoders\FrameworkCoreBundle\Service\PageTitle;
 use SumoCoders\FrameworkCoreBundle\Twig\ContentExtension;
@@ -84,6 +84,9 @@
         ->set('framework.file_type', FileType::class)
         ->tag('form.type', ['alias' => 'sumoFile'])
 
+        ->set('framework.file_type', BelgiumPostCodeType::class)
+        ->tag('form.type', ['alias' => 'sumoBelgiumPostCode'])
+
         /*
          * Secure headers
          */

docs/development/forms.md

@@ -29,3 +29,18 @@ Where `Username` is a translation. So if you want to translate the label, you ca
 ```yaml
 Username: 'Enter your username'
 ```
+
+## Belgium postcode
+
+Form type that allows only valid belgian postcodes to be selected.
+
+Use in your own form:
+```php
+    $builder->add('postcode', BelgiumPostCodeType::class);
+```
+
+Add a property in the DTO:
+```php
+    #[Assert\NotBlank]
+    public ?BelgiumPostCode $postcode = null;
+```

src/Form/Type/BelgiumPostCodeType.php

@@ -0,0 +1,72 @@
+<?php
+
+namespace SumoCoders\FrameworkCoreBundle\Form\Type;
+
+use SumoCoders\FrameworkCoreBundle\Intl\BelgiumPostCodes;
+use SumoCoders\FrameworkCoreBundle\ValueObject\BelgiumPostCode;
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\CallbackTransformer;
+use Symfony\Component\Form\ChoiceList\ChoiceList;
+use Symfony\Component\Form\ChoiceList\Loader\IntlCallbackChoiceLoader;
+use Symfony\Component\Form\Exception\LogicException;
+use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\Intl\Intl;
+use Symfony\Component\OptionsResolver\Options;
+use Symfony\Component\OptionsResolver\OptionsResolver;
+
+class BelgiumPostCodeType extends AbstractType
+{
+    public function buildForm(FormBuilderInterface $builder, array $options): void
+    {
+        $builder->addModelTransformer(
+            new CallbackTransformer(
+                function (?BelgiumPostCode $object): ?string {
+                    return $object ? ($object->postcode . '|' . $object->municipality) : null;
+                },
+                function (?string $postcodeKey): ?BelgiumPostCode {
+                    if ($postcodeKey === null || $postcodeKey === '') {
+                        return null;
+                    }
+
+                    [$postcode, $municipality] = explode('|', $postcodeKey, 2);
+                    return new BelgiumPostCode(
+                        $postcode,
+                        $municipality
+                    );
+                }
+            )
+        );
+    }
+
+    public function configureOptions(OptionsResolver $resolver): void
+    {
+        $resolver->setDefaults([
+            'choice_loader' => function (Options $options) {
+                if (!class_exists(Intl::class)) {
+                    throw new LogicException(sprintf('The "symfony/intl" component is required to use "%s". Try running "composer require symfony/intl".', static::class)); // phpcs:ignore Generic.Files.LineLength
+                }
+
+                return ChoiceList::loader(
+                    $this,
+                    new IntlCallbackChoiceLoader(static fn() => array_flip(BelgiumPostCodes::getNames()))
+                );
+            },
+            'choice_translation_domain' => false,
+            'invalid_message' => 'Please select a valid postcode.',
+            'placeholder' => '',
+            'autocomplete' => true,
+            'label' => 'Postcode and municipality',
+        ]);
+    }
+
+    public function getParent(): ?string
+    {
+        return ChoiceType::class;
+    }
+
+    public function getBlockPrefix(): string
+    {
+        return 'sumoBelgiumPostCode';
+    }
+}

src/Intl/BelgiumPostCodes.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace SumoCoders\FrameworkCoreBundle\Intl;
+
+use Symfony\Component\Intl\ResourceBundle;
+
+class BelgiumPostCodes extends ResourceBundle
+{
+    /**
+     * @return array<string, string>
+     */
+    public static function getNames(): array
+    {
+        return self::readEntry(['Names'], 'nl', false);
+    }
+
+    protected static function getPath(): string
+    {
+        return __DIR__ . '/Resources/data/belgiumpostcodes';
+    }
+}