+function lookup(...)
+ local i, path = nil, {}
+ for i = 1, select('#', ...) do
+ local name, arg = nil, tostring(select(i, ...))
+ for name in arg:gmatch("[^/]+") do
+ path[#path+1] = name
+ end
+ end
+
+ for i = #path, 1, -1 do
+ local node = context.treecache[table.concat(path, ".", 1, i)]
+ if node and (i == #path or node.leaf) then
+ return node, build_url(unpack(path))
+ end
+ end
+end
+