/usr/lib/prosody/util/set.lua is in prosody 0.9.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 | -- 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;
module "set"
local set_mt = {};
function set_mt.__call(set, _, k)
return next(set._items, k);
end
function set_mt.__add(set1, set2)
return _M.union(set1, set2);
end
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 items, new_items = set._items, new_set._items;
for item in pairs(items) do
local new_item = func(item);
if new_item ~= nil then
new_items[new_item] = true;
end
end
return new_set;
end
function set_mt.__eq(set1, set2)
local set1, set2 = set1._items, set2._items;
for item in pairs(set1) do
if not set2[item] then
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)
local s, items = { }, set._items;
for item in pairs(items) do
s[#s+1] = tostring(item);
end
return t_concat(s, ", ");
end
local items_mt = {};
function items_mt.__call(items, _, k)
return next(items, k);
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
items[item] = true;
end
end
end
function set:include(otherset)
for item in otherset do
items[item] = true;
end
end
function set:exclude(otherset)
for item in otherset do
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
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
return set;
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
function xor(set1, set2)
return union(set1, set2) - intersection(set1, set2);
end
return _M;
|