prefix-with-interpolations.patch

diff --git a/lib/nodes/literal.js b/lib/nodes/literal.js
index 314329c..84583e7 100644
--- a/lib/nodes/literal.js
+++ b/lib/nodes/literal.js
@@ -23,6 +23,7 @@ var Literal = module.exports = function Literal(str){
   Node.call(this);
   this.val = str;
   this.string = str;
+  this.prefixed = false;
 };

 /**
diff --git a/lib/nodes/string.js b/lib/nodes/string.js
index 6a4f508..a051981 100644
--- a/lib/nodes/string.js
+++ b/lib/nodes/string.js
@@ -25,6 +25,7 @@ var String = module.exports = function String(val, quote){
   Node.call(this);
   this.val = val;
   this.string = val;
+  this.prefixed = false;
   if (typeof quote !== 'string') {
     this.quote = "'";
   } else {
diff --git a/lib/parser.js b/lib/parser.js
index 42c15c2..38d6210 100644
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -1297,7 +1297,9 @@ Parser.prototype = {
           arr.push(expr);
           break;
         case this.prefix && '.':
-          arr.push(new nodes.Literal(tok.val + this.prefix));
+          var literal = new nodes.Literal(tok.val + this.prefix);
+          literal.prefixed = true;
+          arr.push(literal);
           break;
         case 'comment':
           arr.push(new nodes.Literal(tok.val.str));
diff --git a/lib/visitor/evaluator.js b/lib/visitor/evaluator.js
index 572eef9..a7ce3ff 100644
--- a/lib/visitor/evaluator.js
+++ b/lib/visitor/evaluator.js
@@ -126,6 +126,7 @@ var Evaluator = module.exports = function Evaluator(root, options) {
   this.functions = options.functions || {};
   this.globals = options.globals || {};
   this.paths = options.paths || [];
+  this.prefix = options.prefix;
   this.filename = options.filename;
   this.includeCSS = options['include css'];
   this.resolveURL = options['resolve url'];
@@ -1348,6 +1349,11 @@ Evaluator.prototype.interpolate = function(node){
         return node.name;
       case 'literal':
       case 'string':
+        if (self.prefix && !node.prefixed && !node.val.nodeName) {
+          node.val = node.val.replace(/\./g, '.' + self.prefix);
+          node.prefixed = true;
+        }
+        return node.val;
       case 'unit':
         return node.val;
       case 'expression':