Software / code / prosody
Annotate
util/set.lua @ 1028:594a07e753a0
util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators
| author | Matthew Wild <mwild1@gmail.com> |
|---|---|
| date | Wed, 22 Apr 2009 18:00:45 +0100 |
| parent | 917:f12f88b3d4a1 |
| child | 1029:4ead03974759 |
| rev | line source |
|---|---|
|
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
|
1 local 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
|
2 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
|
3 local t_concat = table.concat; |
| 904 | 4 |
| 5 module "set" | |
| 6 | |
|
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
|
7 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
|
8 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
|
9 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
|
10 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
|
11 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
|
12 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
|
13 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
|
14 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
|
15 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
|
16 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
|
17 function set_mt.__div(set, func) |
|
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 local new_set, new_items = _M.new(); |
|
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 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
|
20 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
|
21 if func(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
|
22 new_items[item] = 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
|
23 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
|
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 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
|
26 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
|
27 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
|
28 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
|
29 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
|
30 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
|
31 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
|
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 |
|
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 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
|
36 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
|
37 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
|
38 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
|
39 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
|
40 |
|
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 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
|
42 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
|
43 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
|
44 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
|
45 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
|
46 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
|
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 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
|
49 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
|
50 |
|
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 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
|
52 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
|
53 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
|
54 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
|
55 |
| 904 | 56 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
|
57 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
|
58 local set = { _items = items }; |
| 904 | 59 |
|
905
6169597d5574
util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents:
904
diff
changeset
|
60 function set:add(item) |
| 904 | 61 items[item] = true; |
| 62 end | |
| 63 | |
|
905
6169597d5574
util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents:
904
diff
changeset
|
64 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
|
65 return items[item]; |
| 904 | 66 end |
| 67 | |
|
905
6169597d5574
util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents:
904
diff
changeset
|
68 function set:items() |
| 904 | 69 return items; |
| 70 end | |
| 71 | |
|
905
6169597d5574
util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents:
904
diff
changeset
|
72 function set:remove(item) |
| 904 | 73 items[item] = nil; |
| 74 end | |
| 75 | |
|
905
6169597d5574
util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents:
904
diff
changeset
|
76 function set:add_list(list) |
| 904 | 77 for _, item in ipairs(list) do |
| 78 items[item] = true; | |
| 79 end | |
| 80 end | |
| 81 | |
|
905
6169597d5574
util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents:
904
diff
changeset
|
82 function set:include(otherset) |
| 904 | 83 for item in pairs(otherset) do |
| 84 items[item] = true; | |
| 85 end | |
| 86 end | |
| 87 | |
|
905
6169597d5574
util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents:
904
diff
changeset
|
88 function set:exclude(otherset) |
| 904 | 89 for item in pairs(otherset) do |
| 90 items[item] = nil; | |
| 91 end | |
| 92 end | |
| 93 | |
|
905
6169597d5574
util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents:
904
diff
changeset
|
94 if list then |
|
6169597d5574
util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents:
904
diff
changeset
|
95 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
|
96 end |
|
6169597d5574
util.set: Fix to make constructor work, and functions defined correctly
Matthew Wild <mwild1@gmail.com>
parents:
904
diff
changeset
|
97 |
|
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
|
98 return setmetatable(set, set_mt); |
| 904 | 99 end |
| 100 | |
| 101 function union(set1, set2) | |
| 102 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
|
103 local items = set._items; |
| 904 | 104 |
|
917
f12f88b3d4a1
util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents:
905
diff
changeset
|
105 for item in pairs(set1._items) do |
| 904 | 106 items[item] = true; |
| 107 end | |
| 108 | |
|
917
f12f88b3d4a1
util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents:
905
diff
changeset
|
109 for item in pairs(set2._items) do |
| 904 | 110 items[item] = true; |
| 111 end | |
| 112 | |
| 113 return set; | |
| 114 end | |
| 115 | |
| 116 function difference(set1, set2) | |
| 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; |
| 904 | 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 |
|
f12f88b3d4a1
util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents:
905
diff
changeset
|
121 items[item] = (not set2._items[item]) or nil; |
| 904 | 122 end |
| 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 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
|
125 end |
|
f12f88b3d4a1
util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents:
905
diff
changeset
|
126 |
|
f12f88b3d4a1
util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents:
905
diff
changeset
|
127 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
|
128 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
|
129 local items = set._items; |
|
f12f88b3d4a1
util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents:
905
diff
changeset
|
130 |
|
f12f88b3d4a1
util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents:
905
diff
changeset
|
131 set1, set2 = set1._items, set2._items; |
|
f12f88b3d4a1
util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents:
905
diff
changeset
|
132 |
|
f12f88b3d4a1
util.set: Rename private items container, optimise set.difference() and add set.intersection()
Matthew Wild <mwild1@gmail.com>
parents:
905
diff
changeset
|
133 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
|
134 items[item] = (not not set2[item]) or nil; |
| 904 | 135 end |
| 136 | |
| 137 return set; | |
| 138 end | |
| 139 | |
| 140 return _M; |
