Comparison

util.set: New util library

comparison

equal deleted inserted replaced

-:6737d005a84a
+:0205dcd0854a
+module "set"
+function new(list)
+	local items = {};
+	local set = { items = items };
+	function set:add(set, item)
+		items[item] = true;
+	end
+	function set:contains(set, item)
+		return items[item]
+	end
+	function set:items(set)
+		return items;
+	end
+	function set:remove(set, item)
+		items[item] = nil;
+	end
+	function set:add_list(set, list)
+		for _, item in ipairs(list) do
+			items[item] = true;
+		end
+	end
+	function set:include(set, otherset)
+		for item in pairs(otherset) do
+			items[item] = true;
+		end
+	end
+	function set:exclude(set, otherset)
+		for item in pairs(otherset) do
+			items[item] = nil;
+		end
+	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] = true;
+	end
+	for item in pairs(set2.items) do
+		items[item] = nil;
+	end
+	return set;
+end
+return _M;