(* Copyright (C) 2004, HELM Team.
 * 
 * This file is part of HELM, an Hypertextual, Electronic
 * Library of Mathematics, developed at the Computer Science
 * Department, University of Bologna, Italy.
 * 
 * HELM is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * HELM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HELM; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA  02111-1307, USA.
 * 
 * For details, see the HELM World-Wide-Web page,
 * http://helm.cs.unibo.it/
 *)

open Printf

open DisambiguateTypes

exception Choice_not_found of string Lazy.t

let num_choices = ref []

let add_num_choice choice = num_choices := choice :: !num_choices

let has_description dsc = (fun x -> fst x = dsc)

let lookup_num_choices () = !num_choices

let lookup_num_by_dsc dsc =
  try
    List.find (has_description dsc) !num_choices
  with Not_found -> raise (Choice_not_found (lazy ("Num with dsc " ^  dsc)))

let mk_choice (dsc, args, appl_pattern) =
  dsc,
  (fun env _ cic_args ->
    let env' =
      let names =
        List.map (function CicNotationPt.IdentArg (_, name) -> name) args
      in
      try
        List.combine names cic_args
      with Invalid_argument _ ->
       raise (Invalid_choice (lazy "The notation expects a different number of arguments"))
    in
    CicNotationFwd.instantiate_appl_pattern env' appl_pattern)

let lookup_symbol_by_dsc symbol dsc =
  try
    mk_choice
      (List.find
        (fun (dsc', _, _) -> dsc = dsc')
        (CicNotationRew.lookup_interpretations symbol))
  with CicNotationRew.Interpretation_not_found | Not_found ->
    raise (Choice_not_found (lazy (sprintf "Symbol %s, dsc %s" symbol dsc)))