1 files changed, 138 insertions, 0 deletions
diff --git a/util/stanza.lua b/util/stanza.lua
new file mode 100644
index 00000000..35277e9c
--- /dev/null
+++ b/util/stanza.lua
@@ -0,0 +1,138 @@
+local t_insert      =  table.insert;
+local t_remove      =  table.remove;
+local format        = string.format;
+local tostring      =      tostring;
+local setmetatable  =  setmetatable;
+local pairs         =         pairs;
+local ipairs        =        ipairs;
+local type          =          type;
+local s_gsub        =   string.gsub;
+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:iq(attrs)
+	return self + stanza("iq", attrs)
+end
+function stanza_mt:message(attrs)
+	return self + stanza("message", attrs)
+end
+function stanza_mt:presence(attrs)
+	return self + stanza("presence", attrs)
+end
+function stanza_mt:query(xmlns)
+	return self:tag("query", { xmlns = xmlns });
+end
+function stanza_mt:tag(name, attrs)
+	local s = stanza(name, attrs);
+	(self.last_add[#self.last_add] or self):add_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_child(text);
+	return self; 
+end
+
+function stanza_mt:up()
+	t_remove(self.last_add);
+	return self;
+end
+
+function stanza_mt:add_child(child)
+	if type(child) == "table" then
+		t_insert(self.tags, child);
+	end
+	t_insert(self, child);
+end
+
+function stanza_mt:child_with_name(name)
+	for _, child in ipairs(self) do	
+		if child.name == name 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
+
+do
+	local xml_entities = { ["'"] = "&apos;", ["\""] = "&quot;", ["<"] = "&lt;", [">"] = "&gt;", ["&"] = "&amp;" };
+	function xml_escape(s) return s_gsub(s, "['&<>\"]", xml_entities); end
+end
+
+local xml_escape = xml_escape;
+
+function stanza_mt.__tostring(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 .. tostring(child);
+		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 .. format(" %s='%s'", k, tostring(v)); end end
+	end
+
+	return format("<%s%s>%s</%s>", t.name, attr_string, children_text, t.name);
+end
+
+function stanza_mt.__add(s1, s2)
+	return s1:add_child(s2);
+end
+
+
+do
+        local id = 0;
+        function new_id()
+                id = id + 1;
+                return "lx"..id;
+        end
+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 nil) });
+end
+
+function presence(attr)
+	return stanza("presence", attr);
+end
+