3 files changed, 53 insertions, 7 deletions
diff --git a/inc/lib/Twig/Error/Loader.php b/inc/lib/Twig/Error/Loader.php
index 68efb574..df566dd7 100644
--- a/inc/lib/Twig/Error/Loader.php
+++ b/inc/lib/Twig/Error/Loader.php
@@ -3,7 +3,7 @@
 /*
  * This file is part of Twig.
  *
- * (c) 2010 Fabien Potencier
+ * (c) Fabien Potencier
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
@@ -24,8 +24,17 @@
  */
 class Twig_Error_Loader extends Twig_Error
 {
-    public function __construct($message, $lineno = -1, $filename = null, Exception $previous = null)
+    public function __construct($message, $lineno = -1, $source = null, Exception $previous = null)
     {
-        parent::__construct($message, false, false, $previous);
+        if (PHP_VERSION_ID < 50300) {
+            $this->previous = $previous;
+            Exception::__construct('');
+        } else {
+            Exception::__construct('', 0, $previous);
+        }
+        $this->appendMessage($message);
+        $this->setTemplateLine(false);
     }
 }
+
+class_alias('Twig_Error_Loader', 'Twig\Error\LoaderError', false);
diff --git a/inc/lib/Twig/Error/Runtime.php b/inc/lib/Twig/Error/Runtime.php
index 8b6ceddb..3b24ad3a 100644
--- a/inc/lib/Twig/Error/Runtime.php
+++ b/inc/lib/Twig/Error/Runtime.php
@@ -3,8 +3,8 @@
 /*
  * This file is part of Twig.
  *
- * (c) 2009 Fabien Potencier
- * (c) 2009 Armin Ronacher
+ * (c) Fabien Potencier
+ * (c) Armin Ronacher
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
@@ -18,3 +18,5 @@
 class Twig_Error_Runtime extends Twig_Error
 {
 }
+
+class_alias('Twig_Error_Runtime', 'Twig\Error\RuntimeError', false);
diff --git a/inc/lib/Twig/Error/Syntax.php b/inc/lib/Twig/Error/Syntax.php
index 0f5c5792..9d09f217 100644
--- a/inc/lib/Twig/Error/Syntax.php
+++ b/inc/lib/Twig/Error/Syntax.php
@@ -3,8 +3,8 @@
 /*
  * This file is part of Twig.
  *
- * (c) 2009 Fabien Potencier
- * (c) 2009 Armin Ronacher
+ * (c) Fabien Potencier
+ * (c) Armin Ronacher
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
@@ -17,4 +17,39 @@
  */
 class Twig_Error_Syntax extends Twig_Error
 {
+    /**
+     * Tweaks the error message to include suggestions.
+     *
+     * @param string $name  The original name of the item that does not exist
+     * @param array  $items An array of possible items
+     */
+    public function addSuggestions($name, array $items)
+    {
+        if (!$alternatives = self::computeAlternatives($name, $items)) {
+            return;
+        }
+
+        $this->appendMessage(sprintf(' Did you mean "%s"?', implode('", "', $alternatives)));
+    }
+
+    /**
+     * @internal
+     *
+     * To be merged with the addSuggestions() method in 2.0.
+     */
+    public static function computeAlternatives($name, $items)
+    {
+        $alternatives = array();
+        foreach ($items as $item) {
+            $lev = levenshtein($name, $item);
+            if ($lev <= strlen($name) / 3 || false !== strpos($item, $name)) {
+                $alternatives[$item] = $lev;
+            }
+        }
+        asort($alternatives);
+
+        return array_keys($alternatives);
+    }
 }
+
+class_alias('Twig_Error_Syntax', 'Twig\Error\SyntaxError', false);