author | Matthew Wild <mwild1@gmail.com> |
Wed, 06 May 2015 19:50:40 +0100 | |
changeset 6676 | b123fcd65d2e |
parent 5908 | 081a91507e4f |
child 6677 | a0ce52e11122 |
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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module "set" |
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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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function set_mt.__add(set1, set2) |
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return _M.union(set1, set2); |
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end |
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function set_mt.__sub(set1, set2) |
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return _M.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 = _M.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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end |
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end |
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return new_set; |
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end |
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function set_mt.__eq(set1, set2) |
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set1, set2 = set1._items, set2._items; |
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for item in pairs(set1) do |
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if not set2[item] then |
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return false; |
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end |
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end |
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for item in pairs(set2) do |
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if not set1[item] then |
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return false; |
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end |
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end |
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return true; |
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end |
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function set_mt.__tostring(set) |
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local s, items = { }, set._items; |
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for item in pairs(items) do |
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s[#s+1] = tostring(item); |
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end |
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return t_concat(s, ", "); |
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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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function new(list) |
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local items = setmetatable({}, items_mt); |
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local set = { _items = items }; |
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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(list) |
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if list then |
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for _, item in ipairs(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; |
96 |
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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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; |
122 |
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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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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141 |
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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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function xor(set1, set2) |
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return union(set1, set2) - intersection(set1, set2); |
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end |
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|
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return _M; |