SwissQR: add Sprain\SwissQrBill and dependencies

htdocs/includes/symfony/validator/Constraints/WhenValidator.php

@@ -0,0 +1,51 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Validator\Constraints;
+
+use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\LogicException;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+
+final class WhenValidator extends ConstraintValidator
+{
+    public function __construct(private ?ExpressionLanguage $expressionLanguage = null)
+    {
+    }
+
+    public function validate(mixed $value, Constraint $constraint): void
+    {
+        if (!$constraint instanceof When) {
+            throw new UnexpectedTypeException($constraint, When::class);
+        }
+
+        $context = $this->context;
+        $variables = $constraint->values;
+        $variables['value'] = $value;
+        $variables['this'] = $context->getObject();
+
+        if ($this->getExpressionLanguage()->evaluate($constraint->expression, $variables)) {
+            $context->getValidator()->inContext($context)
+                ->validate($value, $constraint->constraints);
+        }
+    }
+
+    private function getExpressionLanguage(): ExpressionLanguage
+    {
+        if (!class_exists(ExpressionLanguage::class)) {
+            throw new LogicException(sprintf('The "symfony/expression-language" component is required to use the "%s" validator. Try running "composer require symfony/expression-language".', __CLASS__));
+        }
+
+        return $this->expressionLanguage ??= new ExpressionLanguage();
+    }
+}