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
160
161
162
163
164
165
166
167
168
169
170
|
-- 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;
local _ENV = nil;
-- luacheck: std none
local set_mt = { __name = "set" };
function set_mt.__call(set, _, k)
return next(set._items, k);
end
local items_mt = {};
function items_mt.__call(items, _, k)
return next(items, k);
end
local function new(list)
local items = setmetatable({}, items_mt);
local set = { _items = items };
-- We access the set through an upvalue in these methods, so ignore 'self' being unused
--luacheck: ignore 212/self
function set:add(item)
items[item] = true;
end
function set:contains(item)
return items[item];
end
function set:items()
return next, items;
end
function set:remove(item)
items[item] = nil;
end
function set:add_list(item_list)
if item_list then
for _, item in ipairs(item_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
local 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
local 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
local 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
local function xor(set1, set2)
return union(set1, set2) - intersection(set1, set2);
end
function set_mt.__add(set1, set2)
return union(set1, set2);
end
function set_mt.__sub(set1, set2)
return difference(set1, set2);
end
function set_mt.__div(set, func)
local new_set = 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)
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
return {
new = new;
union = union;
difference = difference;
intersection = intersection;
xor = xor;
};
|
