--- Prosody IM v0.1
--- Copyright (C) 2008 Matthew Wild
--- Copyright (C) 2008 Waqas Hussain
+-- Prosody IM
+-- Copyright (C) 2008-2010 Matthew Wild
+-- Copyright (C) 2008-2010 Waqas Hussain
--
--- This program is free software; you can redistribute it and/or
--- modify it under the terms of the GNU General Public License
--- as published by the Free Software Foundation; either version 2
--- of the License, or (at your option) any later version.
---
--- This program is distributed in the hope that it will be useful,
--- but WITHOUT ANY WARRANTY; without even the implied warranty of
--- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
--- GNU General Public License for more details.
---
--- You should have received a copy of the GNU General Public License
--- along with this program; if not, write to the Free Software
--- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+-- This project is MIT/X11 licensed. Please see the
+-- COPYING file in the source package for more information.
--
local string_rep = string.rep;
local t_concat = table.concat;
local error = error;
local pairs = pairs;
+local next = next;
+
+local loadstring = loadstring;
+local setfenv = setfenv;
+local pcall = pcall;
+local debug_traceback = debug.traceback;
+local log = require "util.logger".init("serialization");
module "serialization"
local indent = function(i)
end
local function basicSerialize (o)
if type(o) == "number" or type(o) == "boolean" then
- return tostring(o);
+ -- 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
- func(t, tostring(o));
+ 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
- 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);
+ 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, ",\n");
+ func(t, indent(ind-1));
+ func(t, "}");
+ else
+ func(t, "{}");
end
- func(t, indent(ind-1));
- func(t, "}");
elseif type(o) == "boolean" then
func(t, (o and "true" or "false"));
else
- error("cannot serialize a " .. type(o))
+ log("error", "cannot serialize a %s: %s", type(o), debug_traceback())
+ func(t, "nil");
end
end
end
function deserialize(str)
- error("Not implemented");
+ if type(str) ~= "string" then return nil; end
+ str = "return "..str;
+ local f, err = loadstring(str, "@data");
+ if not f then return nil, err; end
+ setfenv(f, {});
+ local success, ret = pcall(f);
+ if not success then return nil, ret; end
+ return ret;
end
return _M;