extract some classes for router

src/Illuminate/Routing/MiddlewareNameResolver.php

@@ -0,0 +1,85 @@
+<?php
+
+namespace Illuminate\Routing;
+
+use Closure;
+
+class MiddlewareNameResolver
+{
+    /**
+     * Resolve the middleware name to a class name(s) preserving passed parameters.
+     *
+     * @param  string  $name
+     * @param  array  $map
+     * @param  array  $middlewareGroups
+     * @return string|array
+     */
+    public static function resolve($name, $map, $middlewareGroups)
+    {
+        // When the middleware is simply a Closure, we will return this Closure instance
+        // directly so that Closures can be registered as middleware inline, which is
+        // convenient on occasions when the developers are experimenting with them.
+        if ($name instanceof Closure) {
+            return $name;
+        } elseif (isset($map[$name]) && $map[$name] instanceof Closure) {
+            return $map[$name];
+
+        // If the middleware is the name of a middleware group, we will return the array
+        // of middlewares that belong to the group. This allows developers to group a
+        // set of middleware under single keys that can be conveniently referenced.
+        } elseif (isset($middlewareGroups[$name])) {
+            return static::parseMiddlewareGroup(
+                $name, $map, $middlewareGroups
+            );
+
+        // Finally, when the middleware is simply a string mapped to a class name the
+        // middleware name will get parsed into the full class name and parameters
+        // which may be run using the Pipeline which accepts this string format.
+        } else {
+            list($name, $parameters) = array_pad(explode(':', $name, 2), 2, null);
+
+            return (isset($map[$name]) ? $map[$name] : $name).
+                   (! is_null($parameters) ? ':'.$parameters : '');
+        }
+    }
+
+    /**
+     * Parse the middleware group and format it for usage.
+     *
+     * @param  string  $name
+     * @param  array  $middlewareGroups
+     * @return array
+     */
+    protected static function parseMiddlewareGroup($name, $map, $middlewareGroups)
+    {
+        $results = [];
+
+        foreach ($middlewareGroups[$name] as $middleware) {
+            // If the middleware is another middleware group we will pull in the group and
+            // merge its middleware into the results. This allows groups to conveniently
+            // reference other groups without needing to repeat all their middlewares.
+            if (isset($middlewareGroups[$middleware])) {
+                $results = array_merge($results, static::parseMiddlewareGroup(
+                    $middleware, $map, $middlewareGroups
+                ));
+
+                continue;
+            }
+
+            list($middleware, $parameters) = array_pad(
+                explode(':', $middleware, 2), 2, null
+            );
+
+            // If this middleware is actually a route middleware, we will extract the full
+            // class name out of the middleware list now. Then we'll add the parameters
+            // back onto this class' name so the pipeline will properly extract them.
+            if (isset($map[$middleware])) {
+                $middleware = $map[$middleware];
+            }
+
+            $results[] = $middleware.($parameters ? ':'.$parameters : '');
+        }
+
+        return $results;
+    }
+}

src/Illuminate/Routing/RouteGroup.php

@@ -0,0 +1,95 @@
+<?php
+
+namespace Illuminate\Routing;
+
+use Illuminate\Support\Arr;
+
+class RouteGroup
+{
+    /**
+     * Merge route groups into a new array.
+     *
+     * @param  array  $new
+     * @param  array  $old
+     * @return array
+     */
+    public static function merge($new, $old)
+    {
+        if (isset($new['domain'])) {
+            unset($old['domain']);
+        }
+
+        $new = array_merge(static::formatAs($new, $old), [
+            'namespace' => static::formatNamespace($new, $old),
+            'prefix' => static::formatPrefix($new, $old),
+            'where' => static::formatWhere($new, $old),
+        ]);
+
+        return array_merge_recursive(Arr::except(
+            $old, ['namespace', 'prefix', 'where', 'as']
+        ), $new);
+    }
+
+    /**
+     * Format the namespace for the new group attributes.
+     *
+     * @param  array  $new
+     * @param  array  $old
+     * @return string|null
+     */
+    protected static function formatNamespace($new, $old)
+    {
+        if (isset($new['namespace'])) {
+            return isset($old['namespace'])
+                    ? trim($old['namespace'], '\\').'\\'.trim($new['namespace'], '\\')
+                    : trim($new['namespace'], '\\');
+        }
+
+        return isset($old['namespace']) ? $old['namespace'] : null;
+    }
+
+    /**
+     * Format the prefix for the new group attributes.
+     *
+     * @param  array  $new
+     * @param  array  $old
+     * @return string|null
+     */
+    protected static function formatPrefix($new, $old)
+    {
+        $old = Arr::get($old, 'prefix');
+
+        return isset($new['prefix']) ? trim($old, '/').'/'.trim($new['prefix'], '/') : $old;
+    }
+
+    /**
+     * Format the "wheres" for the new group attributes.
+     *
+     * @param  array  $new
+     * @param  array  $old
+     * @return array
+     */
+    protected static function formatWhere($new, $old)
+    {
+        return array_merge(
+            isset($old['where']) ? $old['where'] : [],
+            isset($new['where']) ? $new['where'] : []
+        );
+    }
+
+    /**
+     * Format the "as" clause of the new group attributes.
+     *
+     * @param  array  $new
+     * @param  array  $old
+     * @return array
+     */
+    protected static function formatAs($new, $old)
+    {
+        if (isset($old['as'])) {
+            $new['as'] = $old['as'].Arr::get($new, 'as', '');
+        }
+
+        return $new;
+    }
+}