Pushing the refactor through the eval/apply functions.

node.hpp

@@ -169,6 +169,7 @@ namespace Sass {
     bool empty() const;
 
     Node& at(size_t i) const;
+    Node& back() const;
     Node& operator[](size_t i) const;
     void  pop_back();
     Node& push_back(Node n);
@@ -302,6 +303,7 @@ namespace Sass {
   inline bool    Node::empty() const       { return ip_->empty(); }
   
   inline Node& Node::at(size_t i) const         { return ip_->at(i); }
+  inline Node& Node::back() const               { return ip_->back(); }
   inline Node& Node::operator[](size_t i) const { return at(i); }
   inline void  Node::pop_back()                 { ip_->pop_back(); }
   inline Node& Node::push_back(Node n)

node_factory.cpp

@@ -61,9 +61,9 @@ namespace Sass {
   // }
 
   // for making nodes representing numbers
-  Node Node_Factory::operator()(string path, size_t line, double v)
+  Node Node_Factory::operator()(string path, size_t line, double v, Node::Type type)
   {
-    Node_Impl* ip = alloc_Node_Impl(Node::number, path, line);
+    Node_Impl* ip = alloc_Node_Impl(type, path, line);
     ip->value.numeric = v;
     return Node(ip);
   }

node_factory.hpp

@@ -25,7 +25,7 @@ namespace Sass {
     // // for making nodes representing boolean values
     // Node operator()(Node::Type type, string file, size_t line, bool b);
     // for making nodes representing numbers
-    Node operator()(string file, size_t line, double v);
+    Node operator()(string file, size_t line, double v, Node::Type type = Node::number);
     // for making nodes representing numeric dimensions (e.g. 5px, 3em)
     Node operator()(string file, size_t line, double v, const Token& t);
     // for making nodes representing rgba color quads