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/
30 let default_eq_URIs = []
31 let default_true_URIs = []
32 let default_false_URIs = []
33 let default_absurd_URIs = []
35 (* eq, sym_eq, trans_eq, eq_ind, eq_ind_R *)
36 let eq_URIs_ref = ref default_eq_URIs;;
38 let true_URIs_ref = ref default_true_URIs
39 let false_URIs_ref = ref default_false_URIs
40 let absurd_URIs_ref = ref default_absurd_URIs
43 (**** SET_DEFAULT ****)
45 exception NotRecognized of string;;
47 (* insert an element in front of the list, removing from the list all the
48 previous elements with the same key associated *)
49 let insert_unique e extract l =
50 let uri = extract e in
52 List.filter (fun x -> let uri' = extract x in not (UriManager.eq uri uri')) l
56 let set_default what l =
58 "equality",[eq_URI;sym_eq_URI;trans_eq_URI;eq_ind_URI;eq_ind_r_URI] ->
60 insert_unique (eq_URI,sym_eq_URI,trans_eq_URI,eq_ind_URI,eq_ind_r_URI)
61 (fun x,_,_,_,_ -> x) !eq_URIs_ref
62 | "true",[true_URI] ->
63 true_URIs_ref := insert_unique true_URI (fun x -> x) !true_URIs_ref
64 | "false",[false_URI] ->
65 false_URIs_ref := insert_unique false_URI (fun x -> x) !false_URIs_ref
66 | "absurd",[absurd_URI] ->
67 absurd_URIs_ref := insert_unique absurd_URI (fun x -> x) !absurd_URIs_ref
68 | _,_ -> raise (NotRecognized what)
70 let reset_defaults () =
71 eq_URIs_ref := default_eq_URIs;
72 true_URIs_ref := default_true_URIs;
73 false_URIs_ref := default_false_URIs;
74 absurd_URIs_ref := default_absurd_URIs
76 (**** LOOKUP FUNCTIONS ****)
79 try let eq,_,_,_,_ = List.hd !eq_URIs_ref in Some eq
80 with Failure "hd" -> None
83 List.exists (fun (eq,_,_,_,_) -> UriManager.eq eq uri) !eq_URIs_ref
85 let is_eq_ind_URI uri =
86 List.exists (fun (_,_,_,eq_ind,_) -> UriManager.eq eq_ind uri) !eq_URIs_ref
88 let is_eq_ind_r_URI uri =
89 List.exists (fun (_,_,_,_,eq_ind_r) -> UriManager.eq eq_ind_r uri) !eq_URIs_ref
90 let is_trans_eq_URI uri =
91 List.exists (fun (_,_,trans_eq,_,_) -> UriManager.eq trans_eq uri) !eq_URIs_ref
92 let is_sym_eq_URI uri =
93 List.exists (fun (_,sym_eq,_,_,_) -> UriManager.eq sym_eq uri) !eq_URIs_ref
95 let sym_eq_URI ~eq:uri =
97 let _,x,_,_,_ = List.find (fun eq,_,_,_,_ -> UriManager.eq eq uri) !eq_URIs_ref in x
98 with Not_found -> raise (NotRecognized (UriManager.string_of_uri uri))
100 let trans_eq_URI ~eq:uri =
102 let _,_,x,_,_ = List.find (fun eq,_,_,_,_ -> UriManager.eq eq uri) !eq_URIs_ref in x
103 with Not_found -> raise (NotRecognized (UriManager.string_of_uri uri))
105 let eq_ind_URI ~eq:uri =
107 let _,_,_,x,_ = List.find (fun eq,_,_,_,_ -> UriManager.eq eq uri) !eq_URIs_ref in x
108 with Not_found -> raise (NotRecognized (UriManager.string_of_uri uri))
110 let eq_ind_r_URI ~eq:uri =
112 let _,_,_,_,x = List.find (fun eq,_,_,_,_ -> UriManager.eq eq uri) !eq_URIs_ref in x
113 with Not_found -> raise (NotRecognized (UriManager.string_of_uri uri))
116 try Some (List.hd !true_URIs_ref) with Failure "hd" -> None
118 try Some (List.hd !false_URIs_ref) with Failure "hd" -> None
120 try Some (List.hd !absurd_URIs_ref) with Failure "hd" -> None