fromString option, use index from argument array for filename instead of "?"

The index allows the caller to map things like parse errors back to the
code chunk where they appeared.

1 files changed, 2 insertions, 2 deletions

diff --git a/tools/node.js b/tools/node.js
index cbe49e39..2eb90363 100644
--- a/tools/node.js
+++ b/tools/node.js
@@ -73,13 +73,13 @@ exports.minify = function(files, options) {
     } else {
         if (typeof files == "string")
             files = [ files ];
-        files.forEach(function(file){
+        files.forEach(function(file, i){
             var code = options.fromString
                 ? file
                 : fs.readFileSync(file, "utf8");
             sourcesContent[file] = code;
             toplevel = UglifyJS.parse(code, {
-                filename: options.fromString ? "?" : file,
+                filename: options.fromString ? i : file,
                 toplevel: toplevel
             });
         });