-- Copyright (C) 2008 Matthew Wild

-- Copyright (C) 2008 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.

--

local string_rep = string.rep;

local type = type;

local tostring = tostring;

local t_insert = table.insert;

local t_concat = table.concat;

local error = error;

local pairs = pairs;

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

		return tostring(o);

	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));

	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);

			end

			func(t, ",\n");

		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))

	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)

	error("Not implemented");

end

return _M;