Expanded-style output works (with some whitespace hiccups).

src/node.cpp

 #include <iostream>
-#include "node.hpp"
 #include <string>
+#include "node.hpp"
 
 using std::string;
+using std::stringstream;
 using std::cout;
 using std::endl;
 
@@ -66,4 +67,43 @@ namespace Sass {
     default: cout << "HUH?"; break;
     }
   }
+  
+  void Node::emit_expanded_css(stringstream& buf, string prefix) {
+    switch (type) {
+    case value:
+    case selector:
+      buf << string(token);
+      break;
+    case comment:
+      buf << string(token) << endl;
+      break;
+    case property:
+      buf << string(token) << ":";
+      break;
+    case values:
+      for (int i = 0; i < children.size(); ++i)
+        buf << " " << string(children[i].token);
+      break;
+    case rule:
+      buf << "  ";
+      children[0].emit_expanded_css(buf, prefix);
+      children[1].emit_expanded_css(buf, prefix);
+      buf << ";" << endl;
+      break;
+    case declarations:
+      buf << " {" << endl;
+      for (int i = 0; i < children.size(); ++i)
+        children[i].emit_expanded_css(buf, prefix);
+      buf << "}" << endl;
+      for (int i = 0; i < opt_children.size(); ++i)
+        opt_children[i].emit_expanded_css(buf, prefix);
+      break;
+    case ruleset:
+      buf << prefix << " ";
+      children[0].emit_expanded_css(buf, prefix);
+      children[1].emit_expanded_css(buf, prefix + string(children[0].token));
+      break;
+    }
+  }
+
 }
\ No newline at end of file

src/node.hpp

 #include <vector>
+#include <sstream>
 #include "token.hpp"
 
 namespace Sass {
@@ -32,5 +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);
   };
 }
\ No newline at end of file

src/test.scss

@@ -4,6 +4,11 @@ div {
   background: blue;
   span {
     font-weight: bold;
+    a {
+      text-decoration: none;
+      color: green;
+    }
+    /* second comment that should be preserved */
     display: inline-block;
   }
   margin: 10px 5px;

src/unit-test-document.cpp

 #include <cstdio>
 #include <iostream>
+#include <sstream>
 #include "document.hpp"
 
 using namespace Sass;
@@ -50,10 +51,14 @@ int main(int argc, char* argv[]) {
     
     int i;
     int j = doc.statements.size();
-    printf("%d\n", j);
+    std::stringstream output;
     for (i = 0; i < j; ++i) {
-      doc.statements[i].dump();
+      doc.statements[i].emit_expanded_css(output, "");
     }
+    
+    std::cout << output.str();
+    
+    
   }
   
   return 0;