1 files changed, 8 insertions, 0 deletions
diff --git a/lib/parse.js b/lib/parse.js
index da39b5b1..b3687201 100644
--- a/lib/parse.js
+++ b/lib/parse.js
@@ -167,6 +167,14 @@ function is_identifier_char(ch) {
     ;
 };
 
+function is_identifier_string(str){
+    for (var i = str.length; --i >= 0;) {
+        if (!is_identifier_char(str.charAt(i)))
+            return false;
+    }
+    return true;
+};
+
 function parse_js_number(num) {
     if (RE_HEX_NUMBER.test(num)) {
         return parseInt(num.substr(2), 16);