diff --git a/Michelf/MarkdownExtra.php b/Michelf/MarkdownExtra.php
index 267bf16d..e8a9c20d 100644
--- a/Michelf/MarkdownExtra.php
+++ b/Michelf/MarkdownExtra.php
@@ -34,6 +34,57 @@ class MarkdownExtra extends \Michelf\_MarkdownExtra_TmpImpl {
 	# Temporarily, the implemenation is in the _MarkdownExtra_TmpImpl class.
 	# See note above.
 
+    /**
+     * @param string $file
+     *
+     * @throws \InvalidArgumentException
+     * @return string
+     */
+    public function transformFile( $file ) {
+        if(file_exists($file)) {
+
+            return $this->transform(file_get_contents($file));
+
+        }
+        throw new \InvalidArgumentException("File {$file} does not exist");
+    }
+
+    /**
+     * @param array $matches
+     *
+     * @return string
+     */
+    protected function _doBlockQuotes_callback($matches) {
+        $bq = $matches[1];
+
+        # trim one level of quoting - trim whitespace-only lines
+        $bq = preg_replace('/^[ ]*>[ ]?|^[ ]+$/m', '', $bq);
+
+        $class = "";
+        // check class
+        if(preg_match('/^\{([\.a-z\-\_\#\ ]+?)\}$/m', $bq, $bqm)) {
+            $class = $bqm[1];
+            // remove first line
+
+            $bq = implode("\n", array_slice(explode("\n", $bq), 1));
+        }
+
+        $bq = $this->runBlockGamut($bq);		# recurse
+
+        $bq = preg_replace('/^/m', "  ", $bq);
+        # These leading spaces cause problem with <pre> content,
+        # so we need to fix that:
+        $bq = preg_replace_callback('{(\s*<pre>.+?</pre>)}sx',
+                                    array(&$this, '_doBlockQuotes_callback2'), $bq);
+
+        if(!empty($class)) {
+            $attr = $this->doExtraAttributes('blockquote', $class);
+            return "\n". $this->hashBlock("<blockquote{$attr}>\n$bq\n</blockquote>")."\n\n";
+        } else {
+            return "\n". $this->hashBlock("<blockquote>\n$bq\n</blockquote>")."\n\n";
+        }
+    }
+
 }