[Minor] Updated Lua to comply the new call semantic

1 files changed, 24 insertions, 0 deletions

diff --git a/lualib/lua_util.lua b/lualib/lua_util.lua
index 0ce0c1874..b8e1dbfad 100644
--- a/lualib/lua_util.lua
+++ b/lualib/lua_util.lua
@@ -664,6 +664,30 @@ exports.extract_specific_urls = function(params_or_task, lim, need_emails, filte
   return res
 end
 
+--[[[
+-- @function lua_util.deepcopy(table)
+-- params: {
+- - table
+-- }
+-- Performs deep copy of the table. Including metatables
+--]]
+local function deepcopy(orig)
+  local orig_type = type(orig)
+  local copy
+  if orig_type == 'table' then
+    copy = {}
+    for orig_key, orig_value in next, orig, nil do
+      copy[deepcopy(orig_key)] = deepcopy(orig_value)
+    end
+    setmetatable(copy, deepcopy(getmetatable(orig)))
+  else -- number, string, boolean, etc
+    copy = orig
+  end
+  return copy
+end
+
+exports.deepcopy = deepcopy
+
 -- Debugging support
 local unconditional_debug = false
 local debug_modules = {}