SwissQR: add Sprain\SwissQrBill and dependencies

htdocs/includes/symfony/validator/ConstraintValidatorFactory.php

@@ -0,0 +1,42 @@
+<?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;
+
+use Symfony\Component\Validator\Constraints\ExpressionValidator;
+
+/**
+ * Default implementation of the ConstraintValidatorFactoryInterface.
+ *
+ * This enforces the convention that the validatedBy() method on any
+ * Constraint will return the class name of the ConstraintValidator that
+ * should validate the Constraint.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+class ConstraintValidatorFactory implements ConstraintValidatorFactoryInterface
+{
+    protected $validators = [];
+
+    public function __construct(array $validators = [])
+    {
+        $this->validators = $validators;
+    }
+
+    public function getInstance(Constraint $constraint): ConstraintValidatorInterface
+    {
+        if ('validator.expression' === $name = $class = $constraint->validatedBy()) {
+            $class = ExpressionValidator::class;
+        }
+
+        return $this->validators[$name] ??= new $class();
+    }
+}