Fixed JS escaping for unicode characters with higher code points

CHANGELOG

@@ -1,6 +1,6 @@
 * 1.32.1 (2017-XX-XX)
 
- * n/a
+ * fixed JS escaping for unicode characters with higher code points
 
 * 1.32.0 (2017-02-26)
 

lib/Twig/Extension/Core.php

@@ -1168,8 +1168,13 @@ function _twig_escape_js_callback($matches)
 
     // \uHHHH
     $char = twig_convert_encoding($char, 'UTF-16BE', 'UTF-8');
+    $char = strtoupper(bin2hex($char));
 
-    return '\\u'.strtoupper(substr('0000'.bin2hex($char), -4));
+    if (4 >= strlen($char)) {
+        return sprintf('\u%04s', $char);
+    }
+
+    return sprintf('\u%04s\u%04s', substr($char, 0, -4), substr($char, -4));
 }
 
 function _twig_escape_css_callback($matches)

test/Twig/Tests/Fixtures/filters/escape_javascript.test

@@ -0,0 +1,8 @@
+--TEST--
+"escape" filter
+--TEMPLATE--
+{{ "é ♜ 𝌆"|e('js') }}
+--DATA--
+return array()
+--EXPECT--
+\u00E9\x20\u265C\x20\uD834\uDF06