From d051f29cacc4f47b71437b8f5afaa9ef7dc428f2 Mon Sep 17 00:00:00 2001
From: Ben Ng <me@benng.me>
Date: Tue, 13 Aug 2013 14:02:52 -0700
Subject: [PATCH] Escape sourcemapped names that contain escapable characters

---
 lib/output.js | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/lib/output.js b/lib/output.js
index 2aa3e982..a7b5e21c 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -282,6 +282,14 @@ function OutputStream(options) {
                 var remainder = 0;
                 var offset = 0;
                 var tokenName;
+                var tokenChars;
+                var escapable = [
+                  {find:'\n', replace:'\\n'},
+                  {find:'\r', replace:'\\r'},
+                  {find:'\t', replace:'\\t'},
+                  {find:'\u2028', replace:'\\u2028'},
+                  {find:'\u2029', replace:'\\u2029'}
+                ];
 
                 tokenName = (!name && token.type == "name") ? token.value : name;
 
@@ -289,6 +297,17 @@ function OutputStream(options) {
                   // Cast to a string, it might be a number
                   tokenName = new String(tokenName);
 
+                  // Fixes offsets for escaped chars in keys of object literals
+                  tokenChars = tokenName.split('');
+                  for(var i=0, ii=tokenChars.length; i<ii; i++) {
+                    for(var y=0, yy=escapable.length; y<yy; y++) {
+                      if(tokenChars[i] === escapable[y].find && (i===0 || tokenChars[i-1] != '\\')) {
+                        tokenChars[i] = escapable[y].replace;
+                      }
+                    }
+                  }
+                  tokenName = tokenChars.join('')
+
                   // Fixes offsets for quoted keys of object literals
                   remainder = token.endpos - token.pos - tokenName.length;
                   offset = remainder === 0 ? 0 : remainder/2;