trunk / file revision

 -- Prosody IM v0.4

 -- Copyright (C) 2008-2009 Matthew Wild

 -- Copyright (C) 2008-2009 Waqas Hussain

 -- 

 -- This project is MIT/X11 licensed. Please see the

 -- COPYING file in the source package for more information.

 --

 local t_insert      =  table.insert;

 local t_concat      =  table.concat;

 local t_remove      =  table.remove;

 local t_concat      =  table.concat;

 local s_format      = string.format;

 local s_match       =  string.match;

 local tostring      =      tostring;

 local setmetatable  =  setmetatable;

 local getmetatable  =  getmetatable;

 local pairs         =         pairs;

 local ipairs        =        ipairs;

 local type          =          type;

 local next          =          next;

 local print         =         print;

 local unpack        =        unpack;

 local s_gsub        =   string.gsub;

 local s_char        =   string.char;

 local os            =            os;

 local do_pretty_printing = not os.getenv("WINDIR");

 local getstyle, getstring = require "util.termcolours".getstyle, require "util.termcolours".getstring;

 local log = require "util.logger".init("stanza");

 module "stanza"

 stanza_mt = {};

 stanza_mt.__index = stanza_mt;

 function stanza(name, attr)

 	local stanza = { name = name, attr = attr or {}, tags = {}, last_add = {}};

 	return setmetatable(stanza, stanza_mt);

 end

 function stanza_mt:query(xmlns)

 	return self:tag("query", { xmlns = xmlns });

 end

 function stanza_mt:body(text, attr)

 	return self:tag("body", attr):text(text);

 end

 function stanza_mt:tag(name, attrs)

 	local s = stanza(name, attrs);

 	(self.last_add[#self.last_add] or self):add_direct_child(s);

 	t_insert(self.last_add, s);

 	return self;

 end

 function stanza_mt:text(text)

 	(self.last_add[#self.last_add] or self):add_direct_child(text);

 	return self; 

 end

 function stanza_mt:up()

 	t_remove(self.last_add);

 	return self;

 end

 function stanza_mt:reset()

 	local last_add = self.last_add;

 	for i = 1,#last_add do

 		last_add[i] = nil;

 	end

 	return self;

 end

 function stanza_mt:add_direct_child(child)

 	if type(child) == "table" then

 		t_insert(self.tags, child);

 	end

 	t_insert(self, child);

 end

 function stanza_mt:add_child(child)

 	(self.last_add[#self.last_add] or self):add_direct_child(child);

 	return self;

 end

 function stanza_mt:child_with_name(name)

 	for _, child in ipairs(self.tags) do	

 		if child.name == name then return child; end

 	end

 end

 function stanza_mt:child_with_ns(ns)

 	for _, child in ipairs(self.tags) do	

 		if child.attr.xmlns == ns then return child; end

 	end

 end

 function stanza_mt:children()

 	local i = 0;

 	return function (a)

 			i = i + 1

 			local v = a[i]

 			if v then return v; end

 		end, self, i;

 end

 function stanza_mt:childtags()

 	local i = 0;

 	return function (a)

 			i = i + 1

 			local v = self.tags[i]

 			if v then return v; end

 		end, self.tags[1], i;

 end

 local xml_escape = (function()

 	local escape_table = { ["'"] = "&apos;", ["\""] = "&quot;", ["<"] = "&lt;", [">"] = "&gt;", ["&"] = "&amp;" };

 	return function(str) return (s_gsub(str, "['&<>\"]", escape_table)); end

 end)();

 local function _dostring(t, buf, self, xml_escape)

 	local nsid, ns, attrk = 0;

 	t_insert(buf, "<"..t.name);

 	for k, v in pairs(t.attr) do

 		ns, attrk = s_match(k, "^([^|]+)|(.+)$");

 		if ns then

 			nsid = nsid + 1;

 			t_insert(buf, " xmlns:ns"..nsid.."='"..xml_escape(ns).."' ".."ns"..nsid..":"..attrk.."='"..xml_escape(v).."'");

 		else

 			t_insert(buf, " "..k.."='"..xml_escape(v).."'");

 		end

 	end

 	t_insert(buf, ">");

 	for n=1,#t do

 		local child = t[n];

 		if child.name then

 			self(child, buf, self, xml_escape);

 		else

 			t_insert(buf, xml_escape(child));

 		end

 	end

 	t_insert(buf, "</"..t.name..">");

 end

 function stanza_mt.__tostring(t)

 	local buf = {};

 	_dostring(t, buf, _dostring, xml_escape);

 	return t_concat(buf);

 end

 function stanza_mt.top_tag(t)

 	local attr_string = "";

 	if t.attr then

 		for k, v in pairs(t.attr) do if type(k) == "string" then attr_string = attr_string .. s_format(" %s='%s'", k, xml_escape(tostring(v))); end end

 	end

 	return s_format("<%s%s>", t.name, attr_string);

 end

 function stanza_mt.__add(s1, s2)

 	return s1:add_direct_child(s2);

 end

 do

         local id = 0;

         function new_id()

                 id = id + 1;

                 return "lx"..id;

         end

 end

 function preserialize(stanza)

 	local s = { name = stanza.name, attr = stanza.attr };

 	for _, child in ipairs(stanza) do

 		if type(child) == "table" then

 			t_insert(s, preserialize(child));

 		else

 			t_insert(s, child);

 		end

 	end

 	return s;

 end

 function deserialize(stanza)

 	-- Set metatable

 	if stanza then

 		local attr = stanza.attr;

 		for i=1,#attr do attr[i] = nil; end

 		setmetatable(stanza, stanza_mt);

 		for _, child in ipairs(stanza) do

 			if type(child) == "table" then

 				deserialize(child);

 			end

 		end

 		if not stanza.tags then

 			-- Rebuild tags

 			local tags = {};

 			for _, child in ipairs(stanza) do

 				if type(child) == "table" then

 					t_insert(tags, child);

 				end

 			end

 			stanza.tags = tags;

 			if not stanza.last_add then

 				stanza.last_add = {};

 			end

 		end

 	end

 	return stanza;

 end

 function clone(stanza)

     local lookup_table = {};

     local function _copy(object)

         if type(object) ~= "table" then

             return object;

         elseif lookup_table[object] then

             return lookup_table[object];

         end

         local new_table = {};

         lookup_table[object] = new_table;

         for index, value in pairs(object) do

             new_table[_copy(index)] = _copy(value);

         end

         return setmetatable(new_table, getmetatable(object));

     end

     return _copy(stanza)

 end

 function message(attr, body)

 	if not body then

 		return stanza("message", attr);

 	else

 		return stanza("message", attr):tag("body"):text(body);

 	end

 end

 function iq(attr)

 	if attr and not attr.id then attr.id = new_id(); end

 	return stanza("iq", attr or { id = new_id() });

 end

 function reply(orig)

 	return stanza(orig.name, orig.attr and { to = orig.attr.from, from = orig.attr.to, id = orig.attr.id, type = ((orig.name == "iq" and "result") or orig.attr.type) });

 end

 function error_reply(orig, type, condition, message)

 	local t = reply(orig);

 	t.attr.type = "error";

 	t:tag("error", {type = type})

 		:tag(condition, {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up();

 	if (message) then t:tag("text"):text(message):up(); end

 	return t; -- stanza ready for adding app-specific errors

 end

 function presence(attr)

 	return stanza("presence", attr);

 end

 if do_pretty_printing then

 	local style_attrk = getstyle("yellow");

 	local style_attrv = getstyle("red");

 	local style_tagname = getstyle("red");

 	local style_punc = getstyle("magenta");

 	local attr_format = " "..getstring(style_attrk, "%s")..getstring(style_punc, "=")..getstring(style_attrv, "'%s'");

 	local top_tag_format = getstring(style_punc, "<")..getstring(style_tagname, "%s").."%s"..getstring(style_punc, ">");

 	--local tag_format = getstring(style_punc, "<")..getstring(style_tagname, "%s").."%s"..getstring(style_punc, ">").."%s"..getstring(style_punc, "</")..getstring(style_tagname, "%s")..getstring(style_punc, ">");

 	local tag_format = top_tag_format.."%s"..getstring(style_punc, "</")..getstring(style_tagname, "%s")..getstring(style_punc, ">");

 	function stanza_mt.pretty_print(t)

 		local children_text = "";

 		for n, child in ipairs(t) do

 			if type(child) == "string" then	

 				children_text = children_text .. xml_escape(child);

 			else

 				children_text = children_text .. child:pretty_print();

 			end

 		end

 		local attr_string = "";

 		if t.attr then

 			for k, v in pairs(t.attr) do if type(k) == "string" then attr_string = attr_string .. s_format(attr_format, k, tostring(v)); end end

 		end

 		return s_format(tag_format, t.name, attr_string, children_text, t.name);

 	end

 	function stanza_mt.pretty_top_tag(t)

 		local attr_string = "";

 		if t.attr then

 			for k, v in pairs(t.attr) do if type(k) == "string" then attr_string = attr_string .. s_format(attr_format, k, tostring(v)); end end

 		end

 		return s_format(top_tag_format, t.name, attr_string);

 	end

 else

 	-- Sorry, fresh out of colours for you guys ;)

 	stanza_mt.pretty_print = stanza_mt.__tostring;

 	stanza_mt.pretty_top_tag = stanza_mt.top_tag;

 end

 return _M;