Still working on general built-in function framework.

functions.cpp

@@ -2,10 +2,38 @@
 #include "node.hpp"
 
 namespace Sass {
+  namespace Functions {
   
-  Node rgb(const Environment& bindings) {
-    
-  
+  extern const char* rgb_metadata[] = {
+    "rgb",
+    "$red",
+    "$green",
+    "$blue",
+    0
+  };
+  Node rgb(const vector<Token>& param_names, const Environment& bindings) {
+    Node color(Node::numeric_color, 0, 3);
+    color << bindings[param_names[0]]
+          << bindings[param_names[1]]
+          << bindings[param_names[2]];
+    return color;
+  }
   
+  extern const char* rgba_metadata[] = {
+    "rgba",
+    "$red",
+    "$green",
+    "$blue",
+    "$alpha",
+    0
+  };
+  Node rgba(const vector<Token>& param_names, const Environment& bindings) {
+    Node color(Node::numeric_color, 0, 3);
+    color << bindings[param_names[0]]
+          << bindings[param_names[1]]
+          << bindings[param_names[2]]
+          << bindings[param_names[3]];
+    return color;
+  }
   
 }
\ No newline at end of file

functions.hpp

@@ -8,6 +8,7 @@ namespace Sass {
     
     string name;
     Node parameters;
+    vector<Token> param_names;
     Primitive primitive;
     
     Function()