1 files changed, 26 insertions, 0 deletions
diff --git a/bin/lib/less/tree/variable.js b/bin/lib/less/tree/variable.js
new file mode 100644
index 00000000..ee557e1d
--- /dev/null
+++ b/bin/lib/less/tree/variable.js
@@ -0,0 +1,26 @@
+(function (tree) {
+
+tree.Variable = function (name, index, file) { this.name = name, this.index = index, this.file = file };
+tree.Variable.prototype = {
+    eval: function (env) {
+        var variable, v, name = this.name;
+
+        if (name.indexOf('@@') == 0) {
+            name = '@' + new(tree.Variable)(name.slice(1)).eval(env).value;
+        }
+
+        if (variable = tree.find(env.frames, function (frame) {
+            if (v = frame.variable(name)) {
+                return v.value.eval(env);
+            }
+        })) { return variable }
+        else {
+            throw { type: 'Name',
+                    message: "variable " + name + " is undefined",
+                    filename: this.file,
+                    index: this.index };
+        }
+    }
+};
+
+})(require('../tree'));