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-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local string_rep = string.rep;
local type = type;
local tostring = tostring;
local t_insert = table.insert;
local t_concat = table.concat;
local pairs = pairs;
local next = next;
local pcall = pcall;
local debug_traceback = debug.traceback;
local log = require "util.logger".init("serialization");
local envload = require"util.envload".envload;
module "serialization"
local indent = function(i)
return string_rep("\t", i);
end
local function basicSerialize (o)
if type(o) == "number" or type(o) == "boolean" then
-- no need to check for NaN, as that's not a valid table index
if o == 1/0 then return "(1/0)";
elseif o == -1/0 then return "(-1/0)";
else return tostring(o); end
else -- assume it is a string -- FIXME make sure it's a string. throw an error otherwise.
return (("%q"):format(tostring(o)):gsub("\\\n", "\\n"));
end
end
local function _simplesave(o, ind, t, func)
if type(o) == "number" then
if o ~= o then func(t, "(0/0)");
elseif o == 1/0 then func(t, "(1/0)");
elseif o == -1/0 then func(t, "(-1/0)");
else func(t, tostring(o)); end
elseif type(o) == "string" then
func(t, (("%q"):format(o):gsub("\\\n", "\\n")));
elseif type(o) == "table" then
if next(o) ~= nil then
func(t, "{\n");
for k,v in pairs(o) do
func(t, indent(ind));
func(t, "[");
func(t, basicSerialize(k));
func(t, "] = ");
if ind == 0 then
_simplesave(v, 0, t, func);
else
_simplesave(v, ind+1, t, func);
end
func(t, ";\n");
end
func(t, indent(ind-1));
func(t, "}");
else
func(t, "{}");
end
elseif type(o) == "boolean" then
func(t, (o and "true" or "false"));
else
log("error", "cannot serialize a %s: %s", type(o), debug_traceback())
func(t, "nil");
end
end
function append(t, o)
_simplesave(o, 1, t, t.write or t_insert);
return t;
end
function serialize(o)
return t_concat(append({}, o));
end
function deserialize(str)
if type(str) ~= "string" then return nil; end
str = "return "..str;
local f, err = envload(str, "@data", {});
if not f then return nil, err; end
local success, ret = pcall(f);
if not success then return nil, ret; end
return ret;
end
return _M;
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