minor #28606 [Validator] Add BC layer covering BicValidator without Intl (chalasr)

This PR was merged into the 4.2-dev branch.

Discussion
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[Validator] Add BC layer covering BicValidator without Intl

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | yes
| Tests pass?   | yes
| Fixed tickets | https://github.com/symfony/symfony/pull/28473#pullrequestreview-158620738
| License       | MIT
| Doc PR        | n/a

Commits
-------

10b8a5f041 [Validator] Add BC layer covering BicValidator without Intl

UPGRADE-4.2.md

@@ -216,3 +216,4 @@ Validator
  * The component is now decoupled from `symfony/translation` and uses `Symfony\Contracts\Translation\TranslatorInterface` instead
  * The `ValidatorBuilderInterface` has been deprecated and `ValidatorBuilder` made final
  * Deprecated validating instances of `\DateTimeInterface` in `DateTimeValidator`, `DateValidator` and `TimeValidator`. Use `Type` instead or remove the constraint if the underlying model is type hinted to `\DateTimeInterface` already.
+ * Using the `Bic` constraint without `symfony/intl` is deprecated

UPGRADE-5.0.md

@@ -199,6 +199,7 @@ Validator
  * The component is now decoupled from `symfony/translation` and uses `Symfony\Contracts\Translation\TranslatorInterface` instead
  * The `ValidatorBuilderInterface` has been removed and `ValidatorBuilder` is now final
  * Removed support for validating instances of `\DateTimeInterface` in `DateTimeValidator`, `DateValidator` and `TimeValidator`. Use `Type` instead or remove the constraint if the underlying model is type hinted to `\DateTimeInterface` already.
+ * The `symfony/intl` component is now required for using the `Bic` constraint
 
 Workflow
 --------

src/Symfony/Component/Validator/CHANGELOG.md

@@ -10,6 +10,7 @@ CHANGELOG
  * made `ValidatorBuilder` final
  * marked `format` the default option in `DateTime` constraint
  * deprecated validating instances of `\DateTimeInterface` in `DateTimeValidator`, `DateValidator` and `TimeValidator`.
+ * deprecated using the `Bic` constraint without `symfony/intl`
 
 4.1.0
 -----

src/Symfony/Component/Validator/Constraints/Bic.php

@@ -11,7 +11,9 @@
 
 namespace Symfony\Component\Validator\Constraints;
 
+use Symfony\Component\Intl\Intl;
 use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\Exception\LogicException;
 
 /**
  * @Annotation
@@ -36,4 +38,14 @@ class Bic extends Constraint
     );
 
     public $message = 'This is not a valid Business Identifier Code (BIC).';
+
+    public function __construct($options = null)
+    {
+        if (!class_exists(Intl::class)) {
+            // throw new LogicException(sprintf('The "symfony/intl" component is required to use the "%s" constraint.', __CLASS__));
+            @trigger_error(sprintf('Using the "%s" constraint without the "symfony/intl" component installed is deprecated since Symfony 4.2.', __CLASS__), E_USER_DEPRECATED);
+        }
+
+        parent::__construct($options);
+    }
 }

src/Symfony/Component/Validator/Constraints/BicValidator.php

@@ -14,7 +14,6 @@ namespace Symfony\Component\Validator\Constraints;
 use Symfony\Component\Intl\Intl;
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\ConstraintValidator;
-use Symfony\Component\Validator\Exception\LogicException;
 use Symfony\Component\Validator\Exception\UnexpectedTypeException;
 
 /**
@@ -69,13 +68,14 @@ class BicValidator extends ConstraintValidator
             return;
         }
 
-        if (!class_exists(Intl::class)) {
-            throw new LogicException('The "symfony/intl" component is required to use the Bic constraint.');
+        // @deprecated since Symfony 4.2
+        if (class_exists(Intl::class)) {
+            $validCountryCode = isset(Intl::getRegionBundle()->getCountryNames()[substr($canonicalize, 4, 2)]);
+        } else {
+            $validCountryCode = ctype_alpha(substr($canonicalize, 4, 2));
         }
 
-        // next 2 letters must be alphabetic (country code)
-        $countries = Intl::getRegionBundle()->getCountryNames();
-        if (!isset($countries[substr($canonicalize, 4, 2)])) {
+        if (!$validCountryCode) {
             $this->context->buildViolation($constraint->message)
                 ->setParameter('{{ value }}', $this->formatValue($value))
                 ->setCode(Bic::INVALID_COUNTRY_CODE_ERROR)