Serializing Lua objects into Lua Code

The following little snippet allows you to ‘pickle’ Lua objects directly into Lua code (with the exception of functions, which are serialized as raw bytecode). Metatable support is on the way, but for now, it should be useful enough.

Example code:

view sourceprint?

01.dofile "pickle.lua"

02.

03.users = {

04.user1 = {pass = "abcdef", start = 10230},

05.user2 = {pass = "cdefba", start = 12032}

06.}

07.

08.userdump = pickle.dumps(users)

09.print(userdump)

Outputs

view sourceprint?

01.return {

02.["user1"] = {

03.["pass"] = "abcdef",

04.["start"] = 10230,

05.},

06.["user2"] = {

07.["pass"] = "cdefba",

08.["start"] = 12032,

09.},

10.}

Pickle API:

pickle.dumps(object) -> String
Pickles an object and returns it.
pickle.dump(object, filename) -> String
Pickles an object and saves it as :filename, afterwards, returns the dump.
pickle.loads(object) -> Lua Object
Loads a string dump of lua object and returns the object. The returned object will not injected into the global table.
pickle.load(filename) -> Lua Object
Loads a pickled object from a file and returns it. The returned object will not be injected into the global table.

Full Source:

view sourceprint?

01.local objects = {}

02.setmetatable(objects, {__index={["subset"]=function(object, proxies)

03.for _,o in ipairs(proxies) do

04.if object == o then return true end

05.end

06.end}})

07.

08.function _pickle(object, seen, indent)

09.---if not seen then seen = {} end

10.if not indent then indent = "" end

11.

12.local serialize_key = function(key)

13.if type(key) == "string" then

14.return "[\""..key.."\"]"

15.elseif type(key) == "table" then

16.return "[".._pickle(key):gsub("\n"," ").."]"

17.else

18.return "["..key.."]"

19.end

20.return key

21.end

22.

23.local escape = function(o)

24.return o:gsub("\\","\\\\"):gsub("'","\\'"):gsub('"','\\"')

25.end

26.

27.---Switch Object type:

28.if type(object) == "table" then

29.local serialize = "{\n"

30.for key, value in pairs(object) do

31.serialize = serialize .. indent.."\t" .. serialize_key(key) .. " = " ..tostring(_pickle(value, seen, indent.."\t")) .. ",\n"

32.end

33.serialize = serialize .. indent .. "}"

34.

35.return serialize

36.elseif type(object) == "string" then

37.return '"' .. escape(object) .. '"'

38.elseif type(object) == "function" then

39.return "loadstring([["..string.dump(object).."]])"

40.elseif objects.subset(object, {"userdata"}) then

41.return nil

42.end

43.return tostring(object)

44.end

45.

46.pickle = {}

47.

48.function pickle.dumps(object)

49.return "return ".. _pickle(object)

50.end

51.

52.function pickle.dump(object, filename)

53.local dump = pickle.dumps(object)

54.local _file = io.open(filename, "wb")

55._file:write(dump)

56._file:close()

57.return dump

58.end

59.

60.function pickle.loads(object)

61.local fn = loadstring(object)

62.if fn then

63.return fn()

64.end

65.end

66.

67.function pickle.load(filename)

68.local _file = io.open(filename, "rb")

69.local dump = _file:read("*all")

70.local object = pickle.loads(dump)

71._file:close()

72.return object

73.end

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