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/
26 type coerc_carr = Uri of UriManager.uri | Sort of Cic.sort | Term of Cic.term
27 exception EqCarrNotImplemented of string Lazy.t
28 exception EqCarrOnNonMetaClosed
32 let coerc_carr_of_term t =
34 Uri (CicUtil.uri_of_term t)
35 with Invalid_argument _ ->
37 | Cic.Sort s -> Sort s
43 | Uri src, Uri tgt -> UriManager.eq src tgt
44 | Sort (Cic.Type _), Sort (Cic.Type _) -> true
45 | Sort src, Sort tgt when src = tgt -> true
47 if CicUtil.is_meta_closed t1 && CicUtil.is_meta_closed t2 then
50 (lazy ("Unsupported carr for coercions: " ^
51 CicPp.ppterm t1 ^ " or " ^ CicPp.ppterm t2)))
52 else raise EqCarrOnNonMetaClosed
55 let name_of_carr = function
56 | Uri u -> UriManager.name_of_uri u
57 | Sort s -> CicPp.ppsort s
58 | Term t -> CicPp.ppterm t
67 let remove_coercion p =
68 db := List.filter (fun u -> not(p u)) !db
71 List.map (fun (_,_,x) -> x) (List.filter (fun (s,t,_) -> f (s,t)) !db)
74 List.exists (fun (_,_,x) -> UriManager.eq x u) !db
78 let src, tgt, _ = List.find (fun (_,_,x) -> UriManager.eq x uri) !db in
80 with Not_found -> assert false (* uri must be a coercion *)
82 let term_of_carr = function
83 | Uri u -> CicUtil.term_of_uri u
84 | Sort s -> Cic.Sort s
85 | Term _ -> assert false