1 (* Copyright (C) 2005, 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://helm.cs.unibo.it/
28 (* eq, sym_eq, trans_eq, eq_ind, eq_ind_R *)
30 ref [HelmLibraryObjects.Logic.eq_URI,
31 HelmLibraryObjects.Logic.sym_eq_URI,
32 HelmLibraryObjects.Logic.trans_eq_URI,
33 HelmLibraryObjects.Logic.eq_ind_URI,
34 HelmLibraryObjects.Logic.eq_ind_r_URI];;
36 let true_URIs_ref = ref [HelmLibraryObjects.Logic.true_URI]
37 let false_URIs_ref = ref [HelmLibraryObjects.Logic.false_URI]
38 let absurd_URIs_ref = ref [HelmLibraryObjects.Logic.absurd_URI]
41 (**** SET_DEFAULT ****)
43 exception NotRecognized;;
45 (* insert an element in front of the list, removing from the list all the
46 previous elements with the same key associated *)
47 let insert_unique e extract l =
48 let uri = extract e in
50 List.filter (fun x -> let uri' = extract x in not (UriManager.eq uri uri')) l
54 let set_default what l =
56 "equality",[eq_URI;sym_eq_URI;trans_eq_URI;eq_ind_URI;eq_ind_r_URI] ->
58 insert_unique (eq_URI,sym_eq_URI,trans_eq_URI,eq_ind_URI,eq_ind_r_URI)
59 (fun x,_,_,_,_ -> x) !eq_URIs_ref
60 | "true",[true_URI] ->
61 true_URIs_ref := insert_unique true_URI (fun x -> x) !true_URIs_ref
62 | "false",[false_URI] ->
63 true_URIs_ref := insert_unique false_URI (fun x -> x) !false_URIs_ref
64 | "absurd",[absurd_URI] ->
65 absurd_URIs_ref := insert_unique absurd_URI (fun x -> x) !absurd_URIs_ref
66 | _,_ -> raise NotRecognized
68 (**** LOOKUP FUNCTIONS ****)
70 let eq_URI () = let eq,_,_,_,_ = List.hd !eq_URIs_ref in eq
73 List.exists (fun (eq,_,_,_,_) -> UriManager.eq eq uri) !eq_URIs_ref
75 let sym_eq_URI ~eq:uri =
77 let _,x,_,_,_ = List.find (fun eq,_,_,_,_ -> UriManager.eq eq uri) !eq_URIs_ref in x
78 with Not_found -> raise NotRecognized
80 let trans_eq_URI ~eq:uri =
82 let _,_,x,_,_ = List.find (fun eq,_,_,_,_ -> UriManager.eq eq uri) !eq_URIs_ref in x
83 with Not_found -> raise NotRecognized
85 let eq_ind_URI ~eq:uri =
87 let _,_,_,x,_ = List.find (fun eq,_,_,_,_ -> UriManager.eq eq uri) !eq_URIs_ref in x
88 with Not_found -> raise NotRecognized
90 let eq_ind_r_URI ~eq:uri =
92 let _,_,_,_,x = List.find (fun eq,_,_,_,_ -> UriManager.eq eq uri) !eq_URIs_ref in x
93 with Not_found -> raise NotRecognized
95 let true_URI () = List.hd !true_URIs_ref
96 let false_URI () = List.hd !false_URIs_ref
97 let absurd_URI () = List.hd !absurd_URIs_ref