trunk: util/stanza.lua@f916f0ff90e5 (annotated)

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util/stanza.lua@f916f0ff90e5 (annotated)

util/stanza.lua

2009-06-25

author: Waqas Hussain <waqas20@gmail.com>
date: Thu Jun 25 17:22:53 2009 +0500
changeset 1416: f916f0ff90e5
parent 1415: 957a81b72cb2
child 1420: 1576a5aa52f8
permissions: -rw-r--r--

util.stanza: Rewrote stanza_mt.__tostring. 20-30% faster stanza serialization. - #optimization

 -- 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;

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util/stanza.lua@f916f0ff90e5 (annotated)

util/stanza.lua