From 5218db779633b2292102863da464896deee0c8cb Mon Sep 17 00:00:00 2001
From: Fabien Potencier <fabien.potencier@gmail.com>
Date: Sat, 26 Jan 2013 16:09:24 +0100
Subject: [PATCH] added an exception when trying to render a template when no loader has been set (closes #975)

---
 lib/Twig/Environment.php            |   12 ++++++++----
 test/Twig/Tests/EnvironmentTest.php |   10 ++++++++++
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/lib/Twig/Environment.php b/lib/Twig/Environment.php
index e3384af..bdda8b4 100644
--- a/lib/Twig/Environment.php
+++ b/lib/Twig/Environment.php
@@ -263,7 +263,7 @@ class Twig_Environment
      */
     public function getTemplateClass($name, $index = null)
     {
-        return $this->templateClassPrefix.md5($this->loader->getCacheKey($name)).(null === $index ? '' : '_'.$index);
+        return $this->templateClassPrefix.md5($this->getLoader()->getCacheKey($name)).(null === $index ? '' : '_'.$index);
     }
 
     /**
@@ -318,10 +318,10 @@ class Twig_Environment
 
         if (!class_exists($cls, false)) {
             if (false === $cache = $this->getCacheFilename($name)) {
-                eval('?>'.$this->compileSource($this->loader->getSource($name), $name));
+                eval('?>'.$this->compileSource($this->getLoader()->getSource($name), $name));
             } else {
                 if (!is_file($cache) || ($this->isAutoReload() && !$this->isTemplateFresh($name, filemtime($cache)))) {
-                    $this->writeCacheFile($cache, $this->compileSource($this->loader->getSource($name), $name));
+                    $this->writeCacheFile($cache, $this->compileSource($this->getLoader()->getSource($name), $name));
                 }
 
                 require_once $cache;
@@ -356,7 +356,7 @@ class Twig_Environment
             }
         }
 
-        return $this->loader->isFresh($name, $time);
+        return $this->getLoader()->isFresh($name, $time);
     }
 
     public function resolveTemplate($names)
@@ -553,6 +553,10 @@ class Twig_Environment
      */
     public function getLoader()
     {
+        if (null === $this->loader) {
+            throw new LogicException('You must set a loader first.');
+        }
+
         return $this->loader;
     }
 
diff --git a/test/Twig/Tests/EnvironmentTest.php b/test/Twig/Tests/EnvironmentTest.php
index fc2cef8..d71e2ec 100644
--- a/test/Twig/Tests/EnvironmentTest.php
+++ b/test/Twig/Tests/EnvironmentTest.php
@@ -11,6 +11,16 @@
 
 class Twig_Tests_EnvironmentTest extends PHPUnit_Framework_TestCase
 {
+    /**
+     * @expectedException        LogicException
+     * @expectedExceptionMessage You must set a loader first.
+     */
+    public function testRenderNoLoader()
+    {
+        $env = new Twig_Environment();
+        $env->render('test');
+    }
+
     public function testAutoescapeOption()
     {
         $loader = new Twig_Loader_Array(array(
-- 
1.7.2.5