X-Git-Url: https://git.enpas.org/?a=blobdiff_plain;f=util%2Fset.lua;h=fa065a9c5b8a2f7df7375273df27f1ae06bd8318;hb=4b39eb72b97e9827e5322974f0424c3fc063ce25;hp=84bfe8c42c299e29bcb506ab153198b5677f91b0;hpb=138c5afe227036aa3cfcff2c3e25ff72e6745de4;p=prosody.git

diff --git a/util/set.lua b/util/set.lua
index 84bfe8c4..fa065a9c 100644
--- a/util/set.lua
+++ b/util/set.lua
@@ -1,4 +1,12 @@
-local ipairs, pairs, setmetatable, next, tostring = 
+-- Prosody IM
+-- 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 =
       ipairs, pairs, setmetatable, next, tostring;
 local t_concat = table.concat;
 
@@ -15,11 +23,12 @@ function set_mt.__sub(set1, set2)
 	return _M.difference(set1, set2);
 end
 function set_mt.__div(set, func)
-	local new_set, new_items = _M.new();
+	local new_set = _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;
@@ -74,19 +83,21 @@ 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
 	
 	function set:include(otherset)
-		for item in pairs(otherset) do
+		for item in otherset do
 			items[item] = true;
 		end
 	end
 
 	function set:exclude(otherset)
-		for item in pairs(otherset) do
+		for item in otherset do
 			items[item] = nil;
 		end
 	end