complete redesign: use nodejs on server instead of php - documentation to be updated

nodejs/node_modules/stylus/lib/functions/lookup.js

@@ -0,0 +1,17 @@
+var utils = require('../utils')
+  , nodes = require('../nodes');
+
+/**
+ * Lookup variable `name` or return Null.
+ *
+ * @param {String} name
+ * @return {Mixed}
+ * @api public
+ */
+
+module.exports = function lookup(name){
+  utils.assertType(name, 'string', 'name');
+  var node = this.lookup(name.val);
+  if (!node) return nodes.null;
+  return this.visit(node);
+};