Added a few more builtins.

context.cpp

@@ -33,6 +33,9 @@ namespace Sass {
     register_function(rgb_descriptor,  rgb);
     register_function(rgba_4_descriptor, rgba_4);
     register_function(rgba_2_descriptor, rgba_2);
+    register_function(red_descriptor, red);
+    register_function(green_descriptor, green);
+    register_function(blue_descriptor, blue);
   }
   
 }
\ No newline at end of file

functions.cpp

 #include "functions.hpp"
 #include <iostream>
-#
 using std::cerr; using std::endl;
 
 namespace Sass {
@@ -35,6 +34,23 @@ namespace Sass {
       return bindings[parameters[0]].clone() << bindings[parameters[1]];
     }
     
+    Function_Descriptor red_descriptor =
+    { "red", "$color", 0 };
+    Node red(const vector<Token>& parameters, map<Token, Node>& bindings) {
+      return bindings[parameters[0]][0];
+    }
+    
+    Function_Descriptor green_descriptor =
+    { "green", "$color", 0 };
+    Node green(const vector<Token>& parameters, map<Token, Node>& bindings) {
+      return bindings[parameters[0]][1];
+    }
+    
+    Function_Descriptor blue_descriptor =
+    { "blue", "$color", 0 };
+    Node blue(const vector<Token>& parameters, map<Token, Node>& bindings) {
+      return bindings[parameters[0]][2];
+    }
     
   }
 }
\ No newline at end of file

functions.hpp

@@ -51,6 +51,15 @@ namespace Sass {
     
     extern Function_Descriptor rgba_2_descriptor;
     Node rgba_2(const vector<Token>& parameters, map<Token, Node>& bindings);
+    
+    extern Function_Descriptor red_descriptor;
+    Node red(const vector<Token>& parameters, map<Token, Node>& bindings);
+    
+    extern Function_Descriptor green_descriptor;
+    Node green(const vector<Token>& parameters, map<Token, Node>& bindings);
+    
+    extern Function_Descriptor blue_descriptor;
+    Node blue(const vector<Token>& parameters, map<Token, Node>& bindings);
   }
   
 }

spec/basic/22_colors_with_alpha/input.scss

@@ -10,4 +10,10 @@ div {
   floo: $x;
   bloo: rgba($x, 0.7);
   groo: $x;
+  
+  $x: rgb(123, 45, 6);
+  
+  hoo: red($x);
+  moo: green($x);
+  poo: blue($x);
 }

spec/basic/22_colors_with_alpha/output.css

@@ -6,4 +6,7 @@ div {
   blah: rgba(1, 2, 3, 0.6);
   floo: aqua;
   bloo: rgba(0, 255, 255, 0.7);
-  groo: aqua; }
+  groo: aqua;
+  hoo: 123;
+  moo: 45;
+  poo: 6; }