Expanded-style output is looking good.

src/node.cpp

@@ -68,13 +68,15 @@ namespace Sass {
     }
   }
   
-  void Node::emit_expanded_css(stringstream& buf, string prefix) {
+  void Node::emit_expanded_css(stringstream& buf, const string& prefix) {
     switch (type) {
     case value:
     case selector:
+      if (!prefix.empty()) buf << " ";
       buf << string(token);
       break;
     case comment:
+      if (!prefix.empty()) buf << "  ";
       buf << string(token) << endl;
       break;
     case property:
@@ -99,9 +101,10 @@ namespace Sass {
         opt_children[i].emit_expanded_css(buf, prefix);
       break;
     case ruleset:
-      buf << prefix << " ";
+      buf << prefix;
       children[0].emit_expanded_css(buf, prefix);
-      children[1].emit_expanded_css(buf, prefix + string(children[0].token));
+      string newprefix(prefix.empty() ? prefix : prefix + " ");
+      children[1].emit_expanded_css(buf, newprefix + string(children[0].token));
       break;
     }
   }

src/node.hpp

@@ -33,6 +33,6 @@ namespace Sass {
     void push_child(const Node& node);
     void push_opt_child(const Node& node);
     void dump(unsigned int depth = 0);
-    void emit_expanded_css(std::stringstream& buf, string prefix);
+    void emit_expanded_css(std::stringstream& buf, const string& prefix);
   };
 }
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src/test.scss

+/* top level comment -- should preserved */
 div {
-  /* a comment that should be preserved */
+  /* another comment that should be preserved */
   color: red;
   background: blue;
   span {
@@ -8,8 +9,13 @@ div {
       text-decoration: none;
       color: green;
     }
-    /* second comment that should be preserved */
+    /* yet another comment that should be preserved */
     display: inline-block;
   }
+  p {
+    padding: 10px 8%;
+  }
   margin: 10px 5px;
-}
\ No newline at end of file
+}
+/* last comment, top level again --
+   compare the indentation! */
\ No newline at end of file