let index_empty_texts = ref false
let sample_factor = ref 64
let disable_text_collection = ref false
let tc_threshold = ref 60000

let query = ref ""
let input_file = ref ""
let output_file = ref None
let save_file = ref ""
let count_only = ref false
let time = ref false
let backward = ref false

let usage_msg = Printf.sprintf "%s <input.{xml|srx}> 'query' [output]" Sys.argv.(0)


let pos = ref 0
let anon_fun = 
  fun s -> match !pos with
    | 0 -> input_file:= s;incr pos
    | 1 -> query := s; incr pos
    | 2 -> output_file := Some s; incr pos
    | _ -> raise (Arg.Bad(s))

let spec = [ "-c", Arg.Set(count_only), "counting only (don't materialize the result set)";
	     "-t", Arg.Set(time), "print timing statistics";
	     "-max-tc", Arg.Set_int(tc_threshold), "set maximum count for which the TextCollection is used";
             "-f", Arg.Set_int(sample_factor), "sample factor [default=64]";
	     "-i", Arg.Set(index_empty_texts), "index empty texts [default=false]";
	     "-d", Arg.Set(disable_text_collection), "disable text collection[default=false]"; 
	     "-s", Arg.Set_string(save_file), "save the intermediate representation into file.srx"; 
	     "-b", Arg.Set(backward), "real bottom up run"; 
	   ]

let parse_cmdline() = 
  let _ = Arg.parse spec anon_fun usage_msg
  in
    if (!pos > 3 || !pos < 2)
    then begin Arg.usage spec usage_msg; exit 1 end