45 lines
918 B
Lua
45 lines
918 B
Lua
local function new(file)
|
|
local set = {}
|
|
local fh = fs.open(file, "r")
|
|
if fh == nil then
|
|
-- no such file, return empty set
|
|
return {inner=set, file=file}
|
|
end
|
|
local line = fh.readLine()
|
|
while line ~= nil do
|
|
if line then
|
|
set[line] = true
|
|
end
|
|
line = fh.readLine()
|
|
end
|
|
fh.close()
|
|
return {inner=set, file=file}
|
|
end
|
|
|
|
local function writeSet(set)
|
|
local fh = fs.open(set.file, "w")
|
|
for it, allowed in pairs(set.inner) do
|
|
if allowed then
|
|
fh.writeLine(it)
|
|
end
|
|
end
|
|
fh.flush()
|
|
fh.close()
|
|
end
|
|
|
|
local function add(set, item)
|
|
set.inner[item] = true
|
|
writeSet(set)
|
|
end
|
|
|
|
local function remove(set, item)
|
|
set.inner[item] = false
|
|
writeSet(set)
|
|
end
|
|
|
|
local function has(set, item)
|
|
return set.inner[item] == true
|
|
end
|
|
|
|
return {new=new, writeSet=writeSet, add=add, remove=remove, has=has}
|