Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/symfony/dependency-injection/Compiler/CheckReferenceValidityPass.php

@@ -0,0 +1,166 @@
+<?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\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+use Symfony\Component\DependencyInjection\Exception\ScopeCrossingInjectionException;
+use Symfony\Component\DependencyInjection\Exception\ScopeWideningInjectionException;
+
+/**
+ * Checks the validity of references.
+ *
+ * The following checks are performed by this pass:
+ * - target definitions are not abstract
+ * - target definitions are of equal or wider scope
+ * - target definitions are in the same scope hierarchy
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class CheckReferenceValidityPass implements CompilerPassInterface
+{
+    private $container;
+    private $currentId;
+    private $currentScope;
+    private $currentScopeAncestors;
+    private $currentScopeChildren;
+
+    /**
+     * Processes the ContainerBuilder to validate References.
+     *
+     * @param ContainerBuilder $container
+     */
+    public function process(ContainerBuilder $container)
+    {
+        $this->container = $container;
+
+        $children = $this->container->getScopeChildren();
+        $ancestors = array();
+
+        $scopes = $this->container->getScopes();
+        foreach ($scopes as $name => $parent) {
+            $ancestors[$name] = array($parent);
+
+            while (isset($scopes[$parent])) {
+                $ancestors[$name][] = $parent = $scopes[$parent];
+            }
+        }
+
+        foreach ($container->getDefinitions() as $id => $definition) {
+            if ($definition->isSynthetic() || $definition->isAbstract()) {
+                continue;
+            }
+
+            $this->currentId = $id;
+            $this->currentDefinition = $definition;
+            $this->currentScope = $scope = $definition->getScope();
+
+            if (ContainerInterface::SCOPE_CONTAINER === $scope) {
+                $this->currentScopeChildren = array_keys($scopes);
+                $this->currentScopeAncestors = array();
+            } elseif (ContainerInterface::SCOPE_PROTOTYPE !== $scope) {
+                $this->currentScopeChildren = isset($children[$scope]) ? $children[$scope] : array();
+                $this->currentScopeAncestors = isset($ancestors[$scope]) ? $ancestors[$scope] : array();
+            }
+
+            $this->validateReferences($definition->getArguments());
+            $this->validateReferences($definition->getMethodCalls());
+            $this->validateReferences($definition->getProperties());
+        }
+    }
+
+    /**
+     * Validates an array of References.
+     *
+     * @param array $arguments An array of Reference objects
+     *
+     * @throws RuntimeException when there is a reference to an abstract definition.
+     */
+    private function validateReferences(array $arguments)
+    {
+        foreach ($arguments as $argument) {
+            if (is_array($argument)) {
+                $this->validateReferences($argument);
+            } elseif ($argument instanceof Reference) {
+                $targetDefinition = $this->getDefinition((string) $argument);
+
+                if (null !== $targetDefinition && $targetDefinition->isAbstract()) {
+                    throw new RuntimeException(sprintf(
+                        'The definition "%s" has a reference to an abstract definition "%s". '
+                       .'Abstract definitions cannot be the target of references.',
+                       $this->currentId,
+                       $argument
+                    ));
+                }
+
+                $this->validateScope($argument, $targetDefinition);
+            }
+        }
+    }
+
+    /**
+     * Validates the scope of a single Reference.
+     *
+     * @param Reference  $reference
+     * @param Definition $definition
+     *
+     * @throws ScopeWideningInjectionException when the definition references a service of a narrower scope
+     * @throws ScopeCrossingInjectionException when the definition references a service of another scope hierarchy
+     */
+    private function validateScope(Reference $reference, Definition $definition = null)
+    {
+        if (ContainerInterface::SCOPE_PROTOTYPE === $this->currentScope) {
+            return;
+        }
+
+        if (!$reference->isStrict()) {
+            return;
+        }
+
+        if (null === $definition) {
+            return;
+        }
+
+        if ($this->currentScope === $scope = $definition->getScope()) {
+            return;
+        }
+
+        $id = (string) $reference;
+
+        if (in_array($scope, $this->currentScopeChildren, true)) {
+            throw new ScopeWideningInjectionException($this->currentId, $this->currentScope, $id, $scope);
+        }
+
+        if (!in_array($scope, $this->currentScopeAncestors, true)) {
+            throw new ScopeCrossingInjectionException($this->currentId, $this->currentScope, $id, $scope);
+        }
+    }
+
+    /**
+     * Returns the Definition given an id.
+     *
+     * @param string $id Definition identifier
+     *
+     * @return Definition
+     */
+    private function getDefinition($id)
+    {
+        if (!$this->container->hasDefinition($id)) {
+            return;
+        }
+
+        return $this->container->getDefinition($id);
+    }
+}