Added module util.serialization

diff --git a/util/serialization.lua b/util/serialization.lua
new file mode 100644 (file)
index 0000000..a3147fd
--- /dev/null
+++ b/util/serialization.lua
@@ -0,0 +1,81 @@
+-- Prosody IM v0.1
+-- 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;