Minor change in eval fn string

Author: shirish87

lib/server.js

@@ -336,17 +336,11 @@ exports.Server = function Server(bsClient, workers) {
 
       if (query && Array.isArray(query.arguments)) {
         var context = { input: query.arguments, format: util.format, output: '' };
-        var tryEvalOrString = function (arg) {
-          try {
-            return eval('o = ' + arg);
-          } catch (e) {
-            return arg;
-          }
-        };
+        var tryEvalOrString = 'function (arg) { try { return eval(\'o = \' + arg); } catch (e) { return arg; } }';
 
         try {
           // eval each element of query.arguments safely in an isolated context
-          vm.runInNewContext('output = format.apply(null, input.map(' + tryEvalOrString.toString() + '));', context);
+          vm.runInNewContext('output = format.apply(null, input.map(' + tryEvalOrString + '));', context);
           logger.info('[' + request.headers['x-browser-string'] + '] ' + context.output);
           logged = true;
         } catch (e) {