[Validator] Add a constraint to sequentially validate a set of constraints

src/Symfony/Component/Validator/CHANGELOG.md

@@ -6,6 +6,7 @@ CHANGELOG
 
  * added the `Hostname` constraint and validator
  * added option `alpha3` to `Country` constraint
+ * added `Sequentially` constraint, to sequentially validate a set of constraints (any violation raised will prevent further validation of the nested constraints)
 
 5.0.0
 -----

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

@@ -0,0 +1,41 @@
+<?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 this constraint to sequentially validate nested constraints.
+ * Validation for the nested constraints collection will stop at first violation.
+ *
+ * @Annotation
+ * @Target({"PROPERTY", "METHOD", "ANNOTATION"})
+ *
+ * @author Maxime Steinhausser <maxime.steinhausser@gmail.com>
+ */
+class Sequentially extends Composite
+{
+    public $constraints = [];
+
+    public function getDefaultOption()
+    {
+        return 'constraints';
+    }
+
+    public function getRequiredOptions()
+    {
+        return ['constraints'];
+    }
+
+    protected function getCompositeOption()
+    {
+        return 'constraints';
+    }
+}

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

@@ -0,0 +1,44 @@
+<?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\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+
+/**
+ * @author Maxime Steinhausser <maxime.steinhausser@gmail.com>
+ */
+class SequentiallyValidator extends ConstraintValidator
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function validate($value, Constraint $constraint)
+    {
+        if (!$constraint instanceof Sequentially) {
+            throw new UnexpectedTypeException($constraint, Sequentially::class);
+        }
+
+        $context = $this->context;
+
+        $validator = $context->getValidator()->inContext($context);
+
+        $originalCount = $validator->getViolations()->count();
+
+        foreach ($constraint->constraints as $c) {
+            if ($originalCount !== $validator->validate($value, $c)->getViolations()->count()) {
+                break;
+            }
+        }
+    }
+}

src/Symfony/Component/Validator/Tests/Constraints/SequentiallyTest.php

@@ -0,0 +1,38 @@
+<?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\Tests\Constraints;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Validator\Constraints\Sequentially;
+use Symfony\Component\Validator\Constraints\Valid;
+use Symfony\Component\Validator\Exception\ConstraintDefinitionException;
+
+class SequentiallyTest extends TestCase
+{
+    public function testRejectNonConstraints()
+    {
+        $this->expectException(ConstraintDefinitionException::class);
+        $this->expectExceptionMessage('The value foo is not an instance of Constraint in constraint Symfony\Component\Validator\Constraints\Sequentially');
+        new Sequentially([
+            'foo',
+        ]);
+    }
+
+    public function testRejectValidConstraint()
+    {
+        $this->expectException(ConstraintDefinitionException::class);
+        $this->expectExceptionMessage('The constraint Valid cannot be nested inside constraint Symfony\Component\Validator\Constraints\Sequentially');
+        new Sequentially([
+            new Valid(),
+        ]);
+    }
+}

src/Symfony/Component/Validator/Tests/Constraints/SequentiallyValidatorTest.php

@@ -0,0 +1,87 @@
+<?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\Tests\Constraints;
+
+use Symfony\Component\Validator\Constraints\NotEqualTo;
+use Symfony\Component\Validator\Constraints\Range;
+use Symfony\Component\Validator\Constraints\Regex;
+use Symfony\Component\Validator\Constraints\Sequentially;
+use Symfony\Component\Validator\Constraints\SequentiallyValidator;
+use Symfony\Component\Validator\Constraints\Type;
+use Symfony\Component\Validator\ConstraintViolation;
+use Symfony\Component\Validator\Test\ConstraintValidatorTestCase;
+
+class SequentiallyValidatorTest extends ConstraintValidatorTestCase
+{
+    protected function createValidator()
+    {
+        return new SequentiallyValidator();
+    }
+
+    public function testWalkThroughConstraints()
+    {
+        $constraints = [
+            new Type('number'),
+            new Range(['min' => 4]),
+        ];
+
+        $value = 6;
+
+        $contextualValidator = $this->context->getValidator()->inContext($this->context);
+        $contextualValidator->expects($this->any())->method('getViolations')->willReturn($this->context->getViolations());
+        $contextualValidator->expects($this->exactly(2))
+            ->method('validate')
+            ->withConsecutive(
+                [$value, $constraints[0]],
+                [$value, $constraints[1]]
+            )
+            ->willReturn($contextualValidator);
+
+        $this->validator->validate($value, new Sequentially($constraints));
+
+        $this->assertNoViolation();
+    }
+
+    public function testStopsAtFirstConstraintWithViolations()
+    {
+        $constraints = [
+            new Type('string'),
+            new Regex(['pattern' => '[a-z]']),
+            new NotEqualTo('Foo'),
+        ];
+
+        $value = 'Foo';
+
+        $contextualValidator = $this->context->getValidator()->inContext($this->context);
+        $contextualValidator->expects($this->any())->method('getViolations')->willReturn($this->context->getViolations());
+        $contextualValidator->expects($this->exactly(2))
+            ->method('validate')
+            ->withConsecutive(
+                [$value, $constraints[0]],
+                [$value, $constraints[1]]
+            )
+            ->will($this->onConsecutiveCalls(
+                // Noop, just return the validator:
+                $this->returnValue($contextualValidator),
+                // Add violation on second call:
+                $this->returnCallback(function () use ($contextualValidator) {
+                    $this->context->getViolations()->add($violation = new ConstraintViolation('regex error', null, [], null, '', null, null, 'regex'));
+
+                    return $contextualValidator;
+                }
+            )));
+
+        $this->validator->validate($value, new Sequentially($constraints));
+
+        $this->assertCount(1, $this->context->getViolations());
+    }
+}