--- /dev/null
+<?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\HttpKernel\ControllerMetadata;
+
+/**
+ * Builds {@see ArgumentMetadata} objects based on the given Controller.
+ *
+ * @author Iltar van der Berg <kjarli@gmail.com>
+ */
+final class ArgumentMetadataFactory implements ArgumentMetadataFactoryInterface
+{
+ /**
+ * If the ...$arg functionality is available.
+ *
+ * Requires at least PHP 5.6.0 or HHVM 3.9.1
+ *
+ * @var bool
+ */
+ private $supportsVariadic;
+
+ /**
+ * If the reflection supports the getType() method to resolve types.
+ *
+ * Requires at least PHP 7.0.0 or HHVM 3.11.0
+ *
+ * @var bool
+ */
+ private $supportsParameterType;
+
+ public function __construct()
+ {
+ $this->supportsVariadic = method_exists('ReflectionParameter', 'isVariadic');
+ $this->supportsParameterType = method_exists('ReflectionParameter', 'getType');
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function createArgumentMetadata($controller)
+ {
+ $arguments = array();
+
+ if (is_array($controller)) {
+ $reflection = new \ReflectionMethod($controller[0], $controller[1]);
+ } elseif (is_object($controller) && !$controller instanceof \Closure) {
+ $reflection = (new \ReflectionObject($controller))->getMethod('__invoke');
+ } else {
+ $reflection = new \ReflectionFunction($controller);
+ }
+
+ foreach ($reflection->getParameters() as $param) {
+ $arguments[] = new ArgumentMetadata($param->getName(), $this->getType($param), $this->isVariadic($param), $this->hasDefaultValue($param), $this->getDefaultValue($param), $param->allowsNull());
+ }
+
+ return $arguments;
+ }
+
+ /**
+ * Returns whether an argument is variadic.
+ *
+ * @param \ReflectionParameter $parameter
+ *
+ * @return bool
+ */
+ private function isVariadic(\ReflectionParameter $parameter)
+ {
+ return $this->supportsVariadic && $parameter->isVariadic();
+ }
+
+ /**
+ * Determines whether an argument has a default value.
+ *
+ * @param \ReflectionParameter $parameter
+ *
+ * @return bool
+ */
+ private function hasDefaultValue(\ReflectionParameter $parameter)
+ {
+ return $parameter->isDefaultValueAvailable();
+ }
+
+ /**
+ * Returns a default value if available.
+ *
+ * @param \ReflectionParameter $parameter
+ *
+ * @return mixed|null
+ */
+ private function getDefaultValue(\ReflectionParameter $parameter)
+ {
+ return $this->hasDefaultValue($parameter) ? $parameter->getDefaultValue() : null;
+ }
+
+ /**
+ * Returns an associated type to the given parameter if available.
+ *
+ * @param \ReflectionParameter $parameter
+ *
+ * @return null|string
+ */
+ private function getType(\ReflectionParameter $parameter)
+ {
+ if ($this->supportsParameterType) {
+ if (!$type = $parameter->getType()) {
+ return;
+ }
+ $typeName = $type instanceof \ReflectionNamedType ? $type->getName() : $type->__toString();
+ if ('array' === $typeName && !$type->isBuiltin()) {
+ // Special case for HHVM with variadics
+ return;
+ }
+
+ return $typeName;
+ }
+
+ if (preg_match('/^(?:[^ ]++ ){4}([a-zA-Z_\x7F-\xFF][^ ]++)/', $parameter, $info)) {
+ return $info[1];
+ }
+ }
+}