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-rw-r--r--util/set.lua36
1 files changed, 18 insertions, 18 deletions
diff --git a/util/set.lua b/util/set.lua
index b9e9ef21..a2df669c 100644
--- a/util/set.lua
+++ b/util/set.lua
@@ -1,7 +1,7 @@
-- 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.
--
@@ -40,13 +40,13 @@ function set_mt.__eq(set1, set2)
return false;
end
end
-
+
for item in pairs(set2) do
if not set1[item] then
return false;
end
end
-
+
return true;
end
function set_mt.__tostring(set)
@@ -65,23 +65,23 @@ end
function new(list)
local items = setmetatable({}, items_mt);
local set = { _items = items };
-
+
function set:add(item)
items[item] = true;
end
-
+
function set:contains(item)
return items[item];
end
-
+
function set:items()
return items;
end
-
+
function set:remove(item)
items[item] = nil;
end
-
+
function set:add_list(list)
if list then
for _, item in ipairs(list) do
@@ -89,7 +89,7 @@ function new(list)
end
end
end
-
+
function set:include(otherset)
for item in otherset do
items[item] = true;
@@ -101,22 +101,22 @@ function new(list)
items[item] = nil;
end
end
-
+
function set:empty()
return not next(items);
end
-
+
if list then
set:add_list(list);
end
-
+
return setmetatable(set, set_mt);
end
function union(set1, set2)
local set = new();
local items = set._items;
-
+
for item in pairs(set1._items) do
items[item] = true;
end
@@ -124,14 +124,14 @@ function union(set1, set2)
for item in pairs(set2._items) do
items[item] = true;
end
-
+
return set;
end
function difference(set1, set2)
local set = new();
local items = set._items;
-
+
for item in pairs(set1._items) do
items[item] = (not set2._items[item]) or nil;
end
@@ -142,13 +142,13 @@ end
function intersection(set1, set2)
local set = new();
local items = set._items;
-
+
set1, set2 = set1._items, set2._items;
-
+
for item in pairs(set1) do
items[item] = (not not set2[item]) or nil;
end
-
+
return set;
end