shadow

1 files changed, 13 insertions, 0 deletions

diff --git a/server/src/vm/local.lua b/server/src/vm/local.lua
index 75f41db2..6062d28e 100644
--- a/server/src/vm/local.lua
+++ b/server/src/vm/local.lua
@@ -56,6 +56,19 @@ function mt:getName()
     return self.name
 end
 
+function mt:shadow(old)
+    if not old then
+        return self._shadow
+    end
+    local group = old._shadow
+    if not group then
+        group = {}
+        group[#group+1] = old
+    end
+    group[#group+1] = self
+    self._shadow = group
+end
+
 return function (name, source, value)
     if not value then
         error('Local must has a value')