git-svn-id: https://msi/svn/firstRepo/Service/branches/Slim3@40 0f545695-f87b-41b6-9a03-7f16563b5454

Slim/CallableResolver.php

@@ -0,0 +1,87 @@
+<?php
+/**
+ * Slim Framework (http://slimframework.com)
+ *
+ * @link      https://github.com/slimphp/Slim
+ * @copyright Copyright (c) 2011-2015 Josh Lockhart
+ * @license   https://github.com/slimphp/Slim/blob/3.x/LICENSE.md (MIT License)
+ */
+namespace Slim;
+
+use RuntimeException;
+use Interop\Container\ContainerInterface;
+use Slim\Interfaces\CallableResolverInterface;
+
+/**
+ * This class resolves a string of the format 'class:method' into a closure
+ * that can be dispatched.
+ */
+final class CallableResolver implements CallableResolverInterface
+{
+    /**
+     * @var ContainerInterface
+     */
+    private $container;
+
+    /**
+     * @param ContainerInterface $container
+     */
+    public function __construct(ContainerInterface $container)
+    {
+        $this->container = $container;
+    }
+
+    /**
+     * Resolve toResolve into a closure that that the router can dispatch.
+     *
+     * If toResolve is of the format 'class:method', then try to extract 'class'
+     * from the container otherwise instantiate it and then dispatch 'method'.
+     *
+     * @param mixed $toResolve
+     *
+     * @return callable
+     *
+     * @throws RuntimeException if the callable does not exist
+     * @throws RuntimeException if the callable is not resolvable
+     */
+    public function resolve($toResolve)
+    {
+        $resolved = $toResolve;
+
+        if (!is_callable($toResolve) && is_string($toResolve)) {
+            // check for slim callable as "class:method"
+            $callablePattern = '!^([^\:]+)\:([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)$!';
+            if (preg_match($callablePattern, $toResolve, $matches)) {
+                $class = $matches[1];
+                $method = $matches[2];
+
+                if ($this->container->has($class)) {
+                    $resolved = [$this->container->get($class), $method];
+                } else {
+                    if (!class_exists($class)) {
+                        throw new RuntimeException(sprintf('Callable %s does not exist', $class));
+                    }
+                    $resolved = [new $class($this->container), $method];
+                }
+            } else {
+                // check if string is something in the DIC that's callable or is a class name which
+                // has an __invoke() method
+                $class = $toResolve;
+                if ($this->container->has($class)) {
+                    $resolved = $this->container->get($class);
+                } else {
+                    if (!class_exists($class)) {
+                        throw new RuntimeException(sprintf('Callable %s does not exist', $class));
+                    }
+                    $resolved = new $class($this->container);
+                }
+            }
+        }
+
+        if (!is_callable($resolved)) {
+            throw new RuntimeException(sprintf('%s is not resolvable', $toResolve));
+        }
+
+        return $resolved;
+    }
+}