1 (* Copyright (C) 2002, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
7 * HELM is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * HELM is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with HELM; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22 * For details, see the HELM World-Wide-Web page,
23 * http://cs.unibo.it/helm/.
26 type cache_key = Cic.term
29 | Succeded of Cic.term
32 type cache = (Universe.universe * ((cache_key * cache_elem) list));;
35 let cache_empty = (Universe.empty,[]);;
37 let get_candidates (univ,_) ty =
38 Universe.get_candidates univ ty
41 let index (univ,cache) key term =
42 Universe.index univ key term,cache
45 let index_term_and_unfolded_term (univ,cache) context t ty =
46 Universe.index_local_term univ context t ty, cache
49 let cache_add_list (univ,cache) context terms_and_types =
53 Universe.index_local_term univ context t ty)
58 let cache_examine (_,oldcache) cache_key =
59 try List.assoc cache_key oldcache with Not_found -> Notfound
61 let cache_replace (univ,oldcache) key v =
62 let oldcache = List.filter (fun (i,_) -> i <> key) oldcache in
63 univ, (key,v)::oldcache
65 let cache_remove (univ,oldcache) key =
66 let oldcache = List.filter (fun (i,_) -> i <> key) oldcache in
69 let cache_add_failure cache cache_key depth =
70 match cache_examine cache cache_key with
71 | Failed_in i when i > depth -> cache
74 | UnderInspection -> cache_replace cache cache_key (Failed_in depth)
76 prerr_endline (CicPp.ppterm t);
77 assert false (* if succed it can't fail *)
79 let cache_add_success ((univ,_) as cache) cache_key proof =
80 Universe.index univ cache_key proof,snd
81 (match cache_examine cache cache_key with
82 | Failed_in _ -> cache_replace cache cache_key (Succeded proof)
83 | UnderInspection -> cache_replace cache cache_key (Succeded proof)
84 | Succeded t -> (* we may decide to keep the smallest proof *) cache
85 | Notfound -> cache_replace cache cache_key (Succeded proof))
87 let cache_add_underinspection ((univ,oldcache) as cache) cache_key depth =
88 match cache_examine cache cache_key with
89 | Failed_in i when i < depth -> cache_replace cache cache_key UnderInspection
90 | Notfound -> univ,(cache_key,UnderInspection)::oldcache
93 | Succeded _ -> assert false (* it must be a new goal *)
95 let cache_print context (_,oldcache) =
96 let names = List.map (function None -> None | Some (x,_) -> Some x) context in
100 | (k,Succeded _) -> Some (CicPp.pp k names)
104 let cache_remove_underinspection ((univ,oldcache) as cache) cache_key =
105 match cache_examine cache cache_key with
107 | UnderInspection -> cache_remove cache cache_key
108 | Failed_in _ -> assert false
109 | Succeded _ -> assert false (* it must be a new goal *)
111 let cache_size (_,oldcache) =
112 List.length (List.filter (function (_,Succeded _) -> true | _ -> false) oldcache)
114 let cache_clean (univ,oldcache) =
115 univ,List.filter (function (_,Succeded _) -> true | _ -> false) oldcache