From: Richard van Velzen <rvanvelzen1@gmail.com>
Date: Thu, 23 Oct 2014 14:16:19 +0000 (+0200)
Subject: Fix #556
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=24bc09b79bf9ca3a09eef4f536e7637568f7097a;p=UglifyJS.git

Fix #556

`\uFEFF` (ZERO WIDTH NO-BREAK SPACE) is removed when parsing, but was
un-escaped for the output when `ascii_only` was false.

When using
UglifyJS multiple times (creating packages from minified sources, for
example), this would lead to problems because the byte was removed when
parsing for the second time.
---

diff --git a/lib/output.js b/lib/output.js
index 7bca4dae..72bcdd5e 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -86,7 +86,7 @@ function OutputStream(options) {
 
     function make_string(str) {
         var dq = 0, sq = 0;
-        str = str.replace(/[\\\b\f\n\r\t\x22\x27\u2028\u2029\0]/g, function(s){
+        str = str.replace(/[\\\b\f\n\r\t\x22\x27\u2028\u2029\0\ufeff]/g, function(s){
             switch (s) {
               case "\\": return "\\\\";
               case "\b": return "\\b";
@@ -98,6 +98,7 @@ function OutputStream(options) {
               case '"': ++dq; return '"';
               case "'": ++sq; return "'";
               case "\0": return "\\x00";
+              case "\ufeff": return "\\ufeff";
             }
             return s;
         });