+
+function stanza_mt:childtags(name, xmlns)
+ local tags = self.tags;
+ local start_i, max_i = 1, #tags;
+ return function ()
+ for i = start_i, max_i do
+ local v = tags[i];
+ if (not name or v.name == name)
+ and ((not xmlns and self.attr.xmlns == v.attr.xmlns)
+ or v.attr.xmlns == xmlns) then
+ start_i = i+1;
+ return v;
+ end
+ end
+ end;
+end
+
+function stanza_mt:maptags(callback)
+ local tags, curr_tag = self.tags, 1;
+ local n_children, n_tags = #self, #tags;
+
+ local i = 1;
+ while curr_tag <= n_tags do
+ if self[i] == tags[curr_tag] then
+ local ret = callback(self[i]);
+ if ret == nil then
+ t_remove(self, i);
+ t_remove(tags, curr_tag);
+ n_children = n_children - 1;
+ n_tags = n_tags - 1;
+ else
+ self[i] = ret;
+ tags[i] = ret;
+ end
+ i = i + 1;
+ curr_tag = curr_tag + 1;
+ end
+ end
+ return self;