Fixes Issue #542. Ensure that top-level objects are parenthesized. It's not valid code, but we might as well not SyntaxError out.

lib/nodes.js

@@ -703,8 +703,12 @@
     __extends(ObjectNode, BaseNode);
     ObjectNode.prototype["class"] = 'ObjectNode';
     ObjectNode.prototype.children = ['properties'];
+    ObjectNode.prototype.topSensitive = function() {
+      return true;
+    };
     ObjectNode.prototype.compileNode = function(o) {
-      var _b, _c, _d, _e, _f, _g, _h, i, indent, inner, join, lastNoncom, nonComments, prop, props;
+      var _b, _c, _d, _e, _f, _g, _h, i, indent, join, lastNoncom, nonComments, obj, prop, props, top;
+      top = del(o, 'top');
       o.indent = this.idt(1);
       nonComments = (function() {
         _b = []; _d = this.properties;
@@ -737,8 +741,8 @@
         return _f;
       }).call(this);
       props = props.join('');
-      inner = props ? '\n' + props + '\n' + this.idt() : '';
-      return '{' + inner + '}';
+      obj = '{' + (props ? '\n' + props + '\n' + this.idt() : '') + '}';
+      return top ? ("(" + (obj) + ")") : obj;
     };
     return ObjectNode;
   })();

lib/rewriter.js

@@ -145,7 +145,7 @@
         before = this.tokens[i - 2];
         if (token[0] === ':' && (!last || last[0] !== '{')) {
           stack.push('{');
-          idx = before[0] === '@' ? i - 2 : i - 1;
+          idx = before && before[0] === '@' ? i - 2 : i - 1;
           this.tokens.splice(idx, 0, ['{', '{', token[2]]);
           condition = function(token, i) {
             var _c, _d, _e, one, three, two;

src/nodes.coffee

@@ -623,10 +623,13 @@ exports.ObjectNode = class ObjectNode extends BaseNode
   class:     'ObjectNode'
   children: ['properties']
 
+  topSensitive: -> true
+
   constructor: (props) ->
     @objects = @properties = props or []
 
   compileNode: (o) ->
+    top = del o, 'top'
     o.indent = @idt 1
     nonComments = prop for prop in @properties when not (prop instanceof CommentNode)
     lastNoncom =  nonComments[nonComments.length - 1]
@@ -638,8 +641,8 @@ exports.ObjectNode = class ObjectNode extends BaseNode
       prop   = new AssignNode prop, prop, 'object' unless prop instanceof AssignNode or prop instanceof CommentNode
       indent + prop.compile(o) + join
     props = props.join('')
-    inner = if props then '\n' + props + '\n' + @idt() else ''
-    '{' + inner + '}'
+    obj   = '{' + (if props then '\n' + props + '\n' + @idt() else '') + '}'
+    if top then "(#{obj})" else obj
 
 #### ArrayNode
 

src/rewriter.coffee

@@ -133,7 +133,7 @@ exports.Rewriter = class Rewriter
       before = @tokens[i - 2]
       if token[0] is ':' and (not last or last[0] isnt '{')
         stack.push '{'
-        idx = if before[0] is '@' then i - 2 else i - 1
+        idx = if before and before[0] is '@' then i - 2 else i - 1
         @tokens.splice idx, 0, ['{', '{', token[2]]
         condition = (token, i) ->
           [one, two, three] = @tokens.slice(i + 1, i + 4)