From d8b99effa0654a51689bc0977bbeda65badb6daa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20Wang?= <fred.wang@free.fr>
Date: Sat, 22 Dec 2012 21:30:14 +0100
Subject: [PATCH] Follow suggestions from Davide's review comment.

---
 unpacked/extensions/toMathML.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/unpacked/extensions/toMathML.js b/unpacked/extensions/toMathML.js
index fc156c613..cb40e66aa 100644
--- a/unpacked/extensions/toMathML.js
+++ b/unpacked/extensions/toMathML.js
@@ -122,10 +122,14 @@ MathJax.Hub.Register.LoadHook("[MathJax]/jax/element/mml/jax.js",function () {
           // Code points U+10000 to U+10FFFF.
           // n is the lead surrogate, let's read the trail surrogate.
           var trailSurrogate = string[i+1].charCodeAt(0);
-          var codePoint = (((n-0xD800)*0x400)+(trailSurrogate-0xDC00)+0x10000);
+          var codePoint = (((n-0xD800)<<10)+(trailSurrogate-0xDC00)+0x10000);
           string[i] = "&#x"+codePoint.toString(16).toUpperCase()+";";
           string[i+1] = "";
           i++;
+        } else {
+          // n is a lead surrogate without corresponding trail surrogate:
+          // remove that character.
+          string[i] = "";
         }
       }
       return string.join("");