Implemented pure-Sass functions.

eval_apply.cpp

@@ -720,11 +720,22 @@ namespace Sass {
         } break;
 
         case Node::while_directive: {
-
+          Node pred_expr(stm[0]);
+          Node while_body(stm[1]);
+          Environment while_env; // re-use this env for each iteration
+          while_env.link(bindings);
+          Node pred_val(eval(pred_expr, Node(), bindings, ctx.function_env, new_Node, ctx));
+          while ((pred_val.type() != Node::boolean) || pred_val.boolean_value()) {
+            Node v(function_eval(name, while_body, while_env, new_Node, ctx));
+            if (v.is_null_ptr()) {
+              pred_val = eval(pred_expr, Node(), bindings, ctx.function_env, new_Node, ctx);
+              continue;
+            }
+            else return v;
+          }
         } break;
 
         case Node::return_directive: {
-          cerr << "blah" << endl;
           return eval(stm[0], Node(), bindings, ctx.function_env, new_Node, ctx);
         } break;