prosody
7e69d61a0ef7
util/set.lua

Find changesets by keywords by author, files, the commit message, revision number or hash, or revset expression.

Software / code / prosody

Annotate

util/set.lua @ 6408:7e69d61a0ef7

Merge 0.10->trunk
author Kim Alvefur <zash@zash.se>
date Thu, 11 Sep 2014 01:17:56 +0200
parent 5908:081a91507e4f
child 6673:b123fcd65d2e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1522
569d58d21612 Add copyright header to those files missing one
Matthew Wild <mwild1@gmail.com>
parents: 1030
diff changeset
1 -- Prosody IM
2923
b7049746bd29 Update copyright headers for 2010
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
2 -- Copyright (C) 2008-2010 Matthew Wild
b7049746bd29 Update copyright headers for 2010
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
3 -- Copyright (C) 2008-2010 Waqas Hussain
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 4908
diff changeset
4 --
1522
569d58d21612 Add copyright header to those files missing one
Matthew Wild <mwild1@gmail.com>
parents: 1030
diff changeset
5 -- This project is MIT/X11 licensed. Please see the
569d58d21612 Add copyright header to those files missing one
Matthew Wild <mwild1@gmail.com>
parents: 1030
diff changeset
6 -- COPYING file in the source package for more information.
569d58d21612 Add copyright header to those files missing one
Matthew Wild <mwild1@gmail.com>
parents: 1030
diff changeset
7 --
569d58d21612 Add copyright header to those files missing one
Matthew Wild <mwild1@gmail.com>
parents: 1030
diff changeset
8
3540
bc139431830b Monster whitespace commit (beware the whitespace monster).
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
9 local ipairs, pairs, setmetatable, next, tostring =
1028
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
10 ipairs, pairs, setmetatable, next, tostring;
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
11 local t_concat = table.concat;
904
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
12
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
13 module "set"
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
14
1028
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
15 local set_mt = {};
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
16 function set_mt.__call(set, _, k)
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
17 return next(set._items, k);
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
18 end
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
19 function set_mt.__add(set1, set2)
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
20 return _M.union(set1, set2);
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
21 end
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
22 function set_mt.__sub(set1, set2)
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
23 return _M.difference(set1, set2);
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
24 end
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
25 function set_mt.__div(set, func)
5906
071a7e461ae7 util.set: Remove unused variable
Matthew Wild <mwild1@gmail.com>
parents: 5813
diff changeset
26 local new_set = _M.new();
1028
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
27 local items, new_items = set._items, new_set._items;
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
28 for item in pairs(items) do
4908
8c5b5ebaacb0 util.set: Change '/' operator from filter to map+filter (nil to drop from set, false is a valid item). No code found which depends on current behaviour.
Matthew Wild <mwild1@gmail.com>
parents: 4544
diff changeset
29 local new_item = func(item);
8c5b5ebaacb0 util.set: Change '/' operator from filter to map+filter (nil to drop from set, false is a valid item). No code found which depends on current behaviour.
Matthew Wild <mwild1@gmail.com>
parents: 4544
diff changeset
30 if new_item ~= nil then
8c5b5ebaacb0 util.set: Change '/' operator from filter to map+filter (nil to drop from set, false is a valid item). No code found which depends on current behaviour.
Matthew Wild <mwild1@gmail.com>
parents: 4544
diff changeset
31 new_items[new_item] = true;
1028
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
32 end
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
33 end
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
34 return new_set;
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
35 end
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
36 function set_mt.__eq(set1, set2)
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
37 local set1, set2 = set1._items, set2._items;
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
38 for item in pairs(set1) do
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
39 if not set2[item] then
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
40 return false;
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
41 end
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
42 end
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 4908
diff changeset
43
1028
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
44 for item in pairs(set2) do
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
45 if not set1[item] then
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
46 return false;
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
47 end
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
48 end
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 4908
diff changeset
49
1028
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
50 return true;
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
51 end
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
52 function set_mt.__tostring(set)
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
53 local s, items = { }, set._items;
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
54 for item in pairs(items) do
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
55 s[#s+1] = tostring(item);
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
56 end
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
57 return t_concat(s, ", ");
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
58 end
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
59
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
60 local items_mt = {};
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
61 function items_mt.__call(items, _, k)
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
62 return next(items, k);
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
63 end
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
64
904
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
65 function new(list)
1028
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
66 local items = setmetatable({}, items_mt);
917
f12f88b3d4a1 util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents: 905
diff changeset
67 local set = { _items = items };
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 4908
diff changeset
68
905
6169597d5574 util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents: 904
diff changeset
69 function set:add(item)
904
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
70 items[item] = true;
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
71 end
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 4908
diff changeset
72
905
6169597d5574 util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents: 904
diff changeset
73 function set:contains(item)
6169597d5574 util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents: 904
diff changeset
74 return items[item];
904
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
75 end
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 4908
diff changeset
76
905
6169597d5574 util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents: 904
diff changeset
77 function set:items()
5817
6e087f3b8f3b util.set: :items() now returns an iterator instead of the underlying table. This is much more efficient than 'for item in set' (which still works for now). Current access to _items is generally done directly, this may change.
Matthew Wild <mwild1@gmail.com>
parents: 5814
diff changeset
78 return next, items;
904
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
79 end
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 4908
diff changeset
80
905
6169597d5574 util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents: 904
diff changeset
81 function set:remove(item)
904
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
82 items[item] = nil;
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
83 end
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 4908
diff changeset
84
905
6169597d5574 util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents: 904
diff changeset
85 function set:add_list(list)
4544
316e2b09a562 util.set: Accept nil to add_list()
Matthew Wild <mwild1@gmail.com>
parents: 3540
diff changeset
86 if list then
316e2b09a562 util.set: Accept nil to add_list()
Matthew Wild <mwild1@gmail.com>
parents: 3540
diff changeset
87 for _, item in ipairs(list) do
316e2b09a562 util.set: Accept nil to add_list()
Matthew Wild <mwild1@gmail.com>
parents: 3540
diff changeset
88 items[item] = true;
316e2b09a562 util.set: Accept nil to add_list()
Matthew Wild <mwild1@gmail.com>
parents: 3540
diff changeset
89 end
904
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
90 end
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
91 end
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 4908
diff changeset
92
905
6169597d5574 util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents: 904
diff changeset
93 function set:include(otherset)
5813
c888f548876b util.set: Fix :include() and :exclude() methods to iterate the input set correctly
Matthew Wild <mwild1@gmail.com>
parents: 4908
diff changeset
94 for item in otherset do
904
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
95 items[item] = true;
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
96 end
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
97 end
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
98
905
6169597d5574 util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents: 904
diff changeset
99 function set:exclude(otherset)
5813
c888f548876b util.set: Fix :include() and :exclude() methods to iterate the input set correctly
Matthew Wild <mwild1@gmail.com>
parents: 4908
diff changeset
100 for item in otherset do
904
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
101 items[item] = nil;
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
102 end
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
103 end
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 4908
diff changeset
104
1029
4ead03974759 util.set: Add set:empty() to discover if the set is the empty set
Matthew Wild <mwild1@gmail.com>
parents: 1028
diff changeset
105 function set:empty()
4ead03974759 util.set: Add set:empty() to discover if the set is the empty set
Matthew Wild <mwild1@gmail.com>
parents: 1028
diff changeset
106 return not next(items);
4ead03974759 util.set: Add set:empty() to discover if the set is the empty set
Matthew Wild <mwild1@gmail.com>
parents: 1028
diff changeset
107 end
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 4908
diff changeset
108
905
6169597d5574 util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents: 904
diff changeset
109 if list then
6169597d5574 util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents: 904
diff changeset
110 set:add_list(list);
6169597d5574 util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents: 904
diff changeset
111 end
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 4908
diff changeset
112
1028
594a07e753a0 util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
Matthew Wild <mwild1@gmail.com>
parents: 917
diff changeset
113 return setmetatable(set, set_mt);
904
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
114 end
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
115
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
116 function union(set1, set2)
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
117 local set = new();
917
f12f88b3d4a1 util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents: 905
diff changeset
118 local items = set._items;
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 4908
diff changeset
119
917
f12f88b3d4a1 util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents: 905
diff changeset
120 for item in pairs(set1._items) do
904
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
121 items[item] = true;
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
122 end
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
123
917
f12f88b3d4a1 util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents: 905
diff changeset
124 for item in pairs(set2._items) do
904
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
125 items[item] = true;
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
126 end
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 4908
diff changeset
127
904
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
128 return set;
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
129 end
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
130
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
131 function difference(set1, set2)
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
132 local set = new();
917
f12f88b3d4a1 util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents: 905
diff changeset
133 local items = set._items;
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 4908
diff changeset
134
917
f12f88b3d4a1 util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents: 905
diff changeset
135 for item in pairs(set1._items) do
f12f88b3d4a1 util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents: 905
diff changeset
136 items[item] = (not set2._items[item]) or nil;
904
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
137 end
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
138
917
f12f88b3d4a1 util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents: 905
diff changeset
139 return set;
f12f88b3d4a1 util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents: 905
diff changeset
140 end
f12f88b3d4a1 util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents: 905
diff changeset
141
f12f88b3d4a1 util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents: 905
diff changeset
142 function intersection(set1, set2)
f12f88b3d4a1 util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents: 905
diff changeset
143 local set = new();
f12f88b3d4a1 util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents: 905
diff changeset
144 local items = set._items;
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 4908
diff changeset
145
917
f12f88b3d4a1 util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents: 905
diff changeset
146 set1, set2 = set1._items, set2._items;
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 4908
diff changeset
147
917
f12f88b3d4a1 util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents: 905
diff changeset
148 for item in pairs(set1) do
f12f88b3d4a1 util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents: 905
diff changeset
149 items[item] = (not not set2[item]) or nil;
904
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
150 end
5776
bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 4908
diff changeset
151
904
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
152 return set;
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
153 end
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
154
1030
a82268d507fc util.set: Add set.xor() to get a set consisting of items not in both sets
Matthew Wild <mwild1@gmail.com>
parents: 1029
diff changeset
155 function xor(set1, set2)
a82268d507fc util.set: Add set.xor() to get a set consisting of items not in both sets
Matthew Wild <mwild1@gmail.com>
parents: 1029
diff changeset
156 return union(set1, set2) - intersection(set1, set2);
a82268d507fc util.set: Add set.xor() to get a set consisting of items not in both sets
Matthew Wild <mwild1@gmail.com>
parents: 1029
diff changeset
157 end
a82268d507fc util.set: Add set.xor() to get a set consisting of items not in both sets
Matthew Wild <mwild1@gmail.com>
parents: 1029
diff changeset
158
904
0205dcd0854a util.set: New util library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
159 return _M;