diff options
Diffstat (limited to 'util/set.lua')
| -rw-r--r-- | util/set.lua | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/util/set.lua b/util/set.lua index 5f7a9ae2..7f45526e 100644 --- a/util/set.lua +++ b/util/set.lua @@ -1,12 +1,12 @@ -- Prosody IM --- Copyright (C) 2008-2009 Matthew Wild --- Copyright (C) 2008-2009 Waqas Hussain +-- Copyright (C) 2008-2010 Matthew Wild +-- Copyright (C) 2008-2010 Waqas Hussain -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- -local ipairs, pairs, setmetatable, next, tostring = +local ipairs, pairs, setmetatable, next, tostring = ipairs, pairs, setmetatable, next, tostring; local t_concat = table.concat; @@ -26,8 +26,9 @@ function set_mt.__div(set, func) local new_set, new_items = _M.new(); local items, new_items = set._items, new_set._items; for item in pairs(items) do - if func(item) then - new_items[item] = true; + local new_item = func(item); + if new_item ~= nil then + new_items[new_item] = true; end end return new_set; @@ -82,8 +83,10 @@ function new(list) end function set:add_list(list) - for _, item in ipairs(list) do - items[item] = true; + if list then + for _, item in ipairs(list) do + items[item] = true; + end end end |