From fc444f1a55c449ac672be9420eff3c1ca131be6d Mon Sep 17 00:00:00 2001
From: Fabien Potencier <fabien.potencier@gmail.com>
Date: Thu, 13 Dec 2012 17:11:23 +0100
Subject: [PATCH] fixed support for Twig loaders when they do not extend
 Twig_ExistsLoaderInterface

---
 .../Controller/ExceptionController.php        | 22 +++++++++++++++++--
 .../Controller/ExceptionController.php        | 20 ++++++++++++++++-
 .../Profiler/TemplateManager.php              | 20 ++++++++++++++++-
 3 files changed, 58 insertions(+), 4 deletions(-)

diff --git a/src/Symfony/Bundle/TwigBundle/Controller/ExceptionController.php b/src/Symfony/Bundle/TwigBundle/Controller/ExceptionController.php
index 6039fb883c..8c07b90b91 100644
--- a/src/Symfony/Bundle/TwigBundle/Controller/ExceptionController.php
+++ b/src/Symfony/Bundle/TwigBundle/Controller/ExceptionController.php
@@ -101,14 +101,14 @@ class ExceptionController
         // when not in debug, try to find a template for the specific HTTP status code and format
         if (!$debug) {
             $template = new TemplateReference('TwigBundle', 'Exception', $name.$code, $format, 'twig');
-            if ($this->twig->getLoader()->exists($template)) {
+            if ($this->templateExists($template)) {
                 return $template;
             }
         }
 
         // try to find a template for the given format
         $template = new TemplateReference('TwigBundle', 'Exception', $name, $format, 'twig');
-        if ($this->twig->getLoader()->exists($template)) {
+        if ($this->templateExists($template)) {
             return $template;
         }
 
@@ -117,4 +117,22 @@ class ExceptionController
 
         return new TemplateReference('TwigBundle', 'Exception', $name, 'html', 'twig');
     }
+
+    // to be removed when the minimum required version of Twig is >= 2.0
+    protected function templateExists($template)
+    {
+        $loader = $this->twig->getLoader();
+        if ($loader instanceof \Twig_ExistsLoaderInterface && $loader->exists($template)) {
+            return true;
+        }
+
+        try {
+            $loader->getSource($template);
+
+            return true;
+        } catch (Twig_Error_Loader $e) {
+        }
+
+        return false;
+    }
 }
diff --git a/src/Symfony/Bundle/WebProfilerBundle/Controller/ExceptionController.php b/src/Symfony/Bundle/WebProfilerBundle/Controller/ExceptionController.php
index 170d61a251..9a760c9f32 100644
--- a/src/Symfony/Bundle/WebProfilerBundle/Controller/ExceptionController.php
+++ b/src/Symfony/Bundle/WebProfilerBundle/Controller/ExceptionController.php
@@ -82,7 +82,7 @@ class ExceptionController
         $exception = $this->profiler->loadProfile($token)->getCollector('exception')->getException();
         $template = $this->getTemplate();
 
-        if (!$this->twig->getLoader()->exists($template)) {
+        if (!$this->templateExists($template)) {
             $handler = new ExceptionHandler();
 
             return new Response($handler->getStylesheet($exception));
@@ -95,4 +95,22 @@ class ExceptionController
     {
         return '@Twig/Exception/'.($this->debug ? 'exception' : 'error').'.html.twig';
     }
+
+    // to be removed when the minimum required version of Twig is >= 2.0
+    protected function templateExists($template)
+    {
+        $loader = $this->twig->getLoader();
+        if ($loader instanceof \Twig_ExistsLoaderInterface && $loader->exists($template)) {
+            return true;
+        }
+
+        try {
+            $loader->getSource($template);
+
+            return true;
+        } catch (Twig_Error_Loader $e) {
+        }
+
+        return false;
+    }
 }
diff --git a/src/Symfony/Bundle/WebProfilerBundle/Profiler/TemplateManager.php b/src/Symfony/Bundle/WebProfilerBundle/Profiler/TemplateManager.php
index da59efb57b..87842dbdbc 100644
--- a/src/Symfony/Bundle/WebProfilerBundle/Profiler/TemplateManager.php
+++ b/src/Symfony/Bundle/WebProfilerBundle/Profiler/TemplateManager.php
@@ -107,7 +107,7 @@ class TemplateManager
                 $template = substr($template, 0, -10);
             }
 
-            if (!$this->twig->getLoader()->exists($template.'.html.twig')) {
+            if (!$this->templateExists($template.'.html.twig')) {
                 throw new \UnexpectedValueException(sprintf('The profiler template "%s.html.twig" for data collector "%s" does not exist.', $template, $name));
             }
 
@@ -116,4 +116,22 @@ class TemplateManager
 
         return $templates;
     }
+
+    // to be removed when the minimum required version of Twig is >= 2.0
+    protected function templateExists($template)
+    {
+        $loader = $this->twig->getLoader();
+        if ($loader instanceof \Twig_ExistsLoaderInterface && $loader->exists($template)) {
+            return true;
+        }
+
+        try {
+            $loader->getSource($template);
+
+            return true;
+        } catch (Twig_Error_Loader $e) {
+        }
+
+        return false;
+    }
 }