add forwardscalls

src/Illuminate/Support/Traits/ForwardsCalls.php

@@ -0,0 +1,75 @@
+<?php
+
+namespace Illuminate\Support\Traits;
+
+use BadMethodCallException;
+use Error;
+
+trait ForwardsCalls
+{
+    /**
+     * Forward a method call to the given object.
+     *
+     * @param  mixed  $object
+     * @param  string  $method
+     * @param  array  $parameters
+     * @return mixed
+     *
+     * @throws \BadMethodCallException
+     */
+    protected function forwardCallTo($object, $method, $parameters)
+    {
+        try {
+            return $object->{$method}(...$parameters);
+        } catch (Error|BadMethodCallException $e) {
+            $pattern = '~^Call to undefined method (?P<class>[^:]+)::(?P<method>[^\(]+)\(\)$~';
+
+            if (! preg_match($pattern, $e->getMessage(), $matches)) {
+                throw $e;
+            }
+
+            if ($matches['class'] != get_class($object) ||
+                $matches['method'] != $method) {
+                throw $e;
+            }
+
+            static::throwBadMethodCallException($method);
+        }
+    }
+
+    /**
+     * Forward a method call to the given object, returning $this if the forwarded call returned itself.
+     *
+     * @param  mixed  $object
+     * @param  string  $method
+     * @param  array  $parameters
+     * @return mixed
+     *
+     * @throws \BadMethodCallException
+     */
+    protected function forwardDecoratedCallTo($object, $method, $parameters)
+    {
+        $result = $this->forwardCallTo($object, $method, $parameters);
+
+        if ($result === $object) {
+            return $this;
+        }
+
+        return $result;
+    }
+
+    /**
+     * Throw a bad method call exception for the given method.
+     *
+     * @param  string  $method
+     * @return void
+     *
+     * @throws \BadMethodCallException
+     */
+    protected static function throwBadMethodCallException($method)
+    {
+        throw new BadMethodCallException(sprintf(
+            'Call to undefined method %s::%s()', static::class, $method
+        ));
+    }
+}