author | Matthew Wild <mwild1@gmail.com> |
Wed, 27 Sep 2017 15:49:41 +0100 | |
changeset 8289 | 39966cbc29f4 |
parent 6780 | 5de6b93d0190 |
child 8525 | 073e517a1487 |
permissions | -rw-r--r-- |
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-- Prosody IM |
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-- Copyright (C) 2008-2010 Matthew Wild |
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-- Copyright (C) 2008-2010 Waqas Hussain |
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-- |
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-- This project is MIT/X11 licensed. Please see the |
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-- COPYING file in the source package for more information. |
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-- |
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local ipairs, pairs, setmetatable, next, tostring = |
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ipairs, pairs, setmetatable, next, tostring; |
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local t_concat = table.concat; |
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local _ENV = nil; |
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local set_mt = {}; |
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function set_mt.__call(set, _, k) |
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return next(set._items, k); |
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end |
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local items_mt = {}; |
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function items_mt.__call(items, _, k) |
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return next(items, k); |
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end |
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local function new(list) |
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local items = setmetatable({}, items_mt); |
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local set = { _items = items }; |
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-- We access the set through an upvalue in these methods, so ignore 'self' being unused |
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--luacheck: ignore 212/self |
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function set:add(item) |
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items[item] = true; |
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end |
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function set:contains(item) |
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return items[item]; |
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end |
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function set:items() |
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return next, items; |
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end |
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function set:remove(item) |
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items[item] = nil; |
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end |
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function set:add_list(item_list) |
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if item_list then |
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for _, item in ipairs(item_list) do |
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items[item] = true; |
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end |
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end |
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end |
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function set:include(otherset) |
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for item in otherset do |
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items[item] = true; |
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end |
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end |
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function set:exclude(otherset) |
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for item in otherset do |
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items[item] = nil; |
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end |
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end |
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function set:empty() |
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return not next(items); |
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end |
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if list then |
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set:add_list(list); |
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end |
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return setmetatable(set, set_mt); |
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end |
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local function union(set1, set2) |
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local set = new(); |
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local items = set._items; |
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for item in pairs(set1._items) do |
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items[item] = true; |
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end |
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for item in pairs(set2._items) do |
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items[item] = true; |
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end |
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return set; |
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end |
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local function difference(set1, set2) |
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local set = new(); |
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local items = set._items; |
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for item in pairs(set1._items) do |
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items[item] = (not set2._items[item]) or nil; |
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end |
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return set; |
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end |
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local function intersection(set1, set2) |
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local set = new(); |
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local items = set._items; |
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set1, set2 = set1._items, set2._items; |
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for item in pairs(set1) do |
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items[item] = (not not set2[item]) or nil; |
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end |
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return set; |
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end |
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local function xor(set1, set2) |
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return union(set1, set2) - intersection(set1, set2); |
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end |
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function set_mt.__add(set1, set2) |
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return union(set1, set2); |
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end |
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function set_mt.__sub(set1, set2) |
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return difference(set1, set2); |
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end |
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function set_mt.__div(set, func) |
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local new_set = new(); |
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local items, new_items = set._items, new_set._items; |
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for item in pairs(items) do |
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local new_item = func(item); |
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if new_item ~= nil then |
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new_items[new_item] = true; |
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135 |
end |
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136 |
end |
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return new_set; |
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138 |
end |
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139 |
function set_mt.__eq(set1, set2) |
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set1, set2 = set1._items, set2._items; |
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141 |
for item in pairs(set1) do |
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142 |
if not set2[item] then |
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143 |
return false; |
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144 |
end |
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145 |
end |
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146 |
|
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for item in pairs(set2) do |
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148 |
if not set1[item] then |
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149 |
return false; |
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150 |
end |
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151 |
end |
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152 |
|
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153 |
return true; |
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154 |
end |
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155 |
function set_mt.__tostring(set) |
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156 |
local s, items = { }, set._items; |
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157 |
for item in pairs(items) do |
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158 |
s[#s+1] = tostring(item); |
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159 |
end |
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160 |
return t_concat(s, ", "); |
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161 |
end |
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162 |
|
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163 |
return { |
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164 |
new = new; |
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165 |
union = union; |
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166 |
difference = difference; |
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167 |
intersection = intersection; |
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168 |
xor = xor; |
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169 |
}; |