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.
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8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
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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 type coerc_carr = Uri of UriManager.uri | Sort of Cic.sort | Term of Cic.term
29 exception EqCarrNotImplemented of string Lazy.t
30 exception EqCarrOnNonMetaClosed
34 let coerc_carr_of_term t =
36 Uri (CicUtil.uri_of_term t)
37 with Invalid_argument _ ->
39 | Cic.Sort s -> Sort s
40 | Cic.Appl ((Cic.Const (uri, _))::_)
41 | Cic.Appl ((Cic.MutInd (uri, _, _))::_)
42 | Cic.Appl ((Cic.MutConstruct (uri, _, _, _))::_) -> Uri uri
46 let name_of_carr = function
47 | Uri u -> UriManager.name_of_uri u
48 | Sort s -> CicPp.ppsort s
49 | Term (Cic.Appl ((Cic.Const (uri, _))::_))
50 | Term (Cic.Appl ((Cic.MutInd (uri, _, _))::_))
51 | Term (Cic.Appl ((Cic.MutConstruct (uri, _, _, _))::_)) ->
52 UriManager.name_of_uri uri
53 | Term t -> (* CicPp.ppterm t *) assert false
57 | Uri src, Uri tgt -> UriManager.eq src tgt
58 | Sort (Cic.Type _), Sort (Cic.Type _) -> true
59 | Sort src, Sort tgt when src = tgt -> true
61 if CicUtil.is_meta_closed t1 && CicUtil.is_meta_closed t2 then
64 (lazy ("Unsupported carr for coercions: " ^
65 CicPp.ppterm t1 ^ " or " ^ CicPp.ppterm t2)))
66 else raise EqCarrOnNonMetaClosed
75 let remove_coercion p =
76 db := List.filter (fun u -> not(p u)) !db
79 List.map (fun (_,_,x) -> x) (List.filter (fun (s,t,_) -> f (s,t)) !db)
82 List.exists (fun (_,_,x) -> UriManager.eq x u) !db
86 let src, tgt, _ = List.find (fun (_,_,x) -> UriManager.eq x uri) !db in
88 with Not_found -> assert false (* uri must be a coercion *)
90 let term_of_carr = function
91 | Uri u -> CicUtil.term_of_uri u
92 | Sort s -> Cic.Sort s
93 | Term _ -> assert false