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local ipairs, pairs =
ipairs, pairs;
module "set"
function new(list)
local items = {};
local set = { _items = items };
function set:add(item)
items[item] = true;
end
function set:contains(item)
return items[item];
end
function set:items()
return items;
end
function set:remove(item)
items[item] = nil;
end
function set:add_list(list)
for _, item in ipairs(list) do
items[item] = true;
end
end
function set:include(otherset)
for item in pairs(otherset) do
items[item] = true;
end
end
function set:exclude(otherset)
for item in pairs(otherset) do
items[item] = nil;
end
end
if list then
set:add_list(list);
end
return set;
end
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
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
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
return _M;
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