From ed03f791fd18276dfa0387abe7b2e823d8298872 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Konstantin=20K=C3=A4fer?= <github@kkaefer.com>
Date: Wed, 2 Feb 2011 17:01:10 -0500
Subject: [PATCH] clone rules that are already attached to a definition

---
 lib/mess/tree/definition.js |  1 +
 lib/mess/tree/rule.js       | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/lib/mess/tree/definition.js b/lib/mess/tree/definition.js
index 09c6973..a1a03e1 100644
--- a/lib/mess/tree/definition.js
+++ b/lib/mess/tree/definition.js
@@ -7,6 +7,7 @@ tree.Definition = function Definition(selector, rules) {
     this.rules = rules;
     this.ruleIndex = [];
     for (var i = 0; i < this.rules.length; i++) {
+        if ('zoom' in this.rules[i]) this.rules[i] = this.rules[i].clone();
         this.rules[i].zoom = selector.zoom;
         this.ruleIndex.push(this.rules[i].updateID());
     }
diff --git a/lib/mess/tree/rule.js b/lib/mess/tree/rule.js
index 4391283..5a19d9e 100644
--- a/lib/mess/tree/rule.js
+++ b/lib/mess/tree/rule.js
@@ -9,6 +9,17 @@ tree.Rule = function Rule(name, value, index, filename) {
     this.variable = (name.charAt(0) === '@');
 };
 
+tree.Rule.prototype.clone = function() {
+    var clone = Object.create(tree.Rule.prototype);
+    clone.name = this.name
+    clone.value = this.value;
+    clone.index = this.index;
+    clone.symbolizer = this.symbolizer;
+    clone.filename = this.filename;
+    clone.variable = this.variable;
+    return clone;
+};
+
 tree.Rule.prototype.updateID = function() {
     return this.id = this.zoom + '#' + this.name;
 };