add whitespace option and move util.errorWithNode to File

lib/6to5/util.js

@@ -73,16 +73,6 @@ exports.getIds = function (node) {
   return ids;
 };
 
-exports.errorWithNode = function (node, msg) {
-  var line = node.loc.start.line;
-  var col  = node.loc.start.column;
-
-  var err = new SyntaxError("Line " + line + ": " + msg);
-  err.lineNumber = line;
-  err.column = col;
-  return err;
-};
-
 exports.canCompile = function (filename) {
   var ext = path.extname(filename);
   return _.contains([".js", ".es6"], ext);
@@ -202,20 +192,14 @@ exports.repeat = function (width, cha) {
 
 exports.parse = function (opts, code, callback) {
   try {
-    var recastOpts = {};
-
-    if (opts.sourceMap) {
-      recastOpts.sourceFileName = opts.sourceFileName;
-      recastOpts.sourceRoot     = opts.sourceRoot;
-    }
-
     var comments = [];
     var tokens   = [];
 
     var ast = acorn.parse(code, {
       ecmaVersion: Infinity,
+      strictMode:  true,
       onComment:   comments,
-      locations:   true,
+      locations:   opts.sourceMap,
       onToken:     tokens,
       ranges:      true
     });