Speeds up source maps by restoring escaped content only if needed.

diff --git a/lib/selectors/source-map-stringifier.js b/lib/selectors/source-map-stringifier.js
index ba2c4fb..894f80b 100644 (file)
--- a/lib/selectors/source-map-stringifier.js
+++ b/lib/selectors/source-map-stringifier.js
@@ -92,7 +92,9 @@ SourceMapStringifier.prototype.toString = function (tokens) {
       track(context, token);
       output.push(token);
     } else {
-      var val = self.restoreCallback(token.value);
+      var val = token.value.indexOf('_') > -1 ?
+        self.restoreCallback(token.value) :
+        token.value;
       track(context, val, token.metadata);
       output.push(val);
     }