1 (* Copyright (C) 2000, 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/.
28 let debug_print = fun _ -> ()
30 type coercions = (UriManager.uri * UriManager.uri * UriManager.uri) list
32 (* the list of known coercions (MUST be transitively closed) *)
34 (UriManager.uri_of_string "cic:/Coq/Init/Datatypes/nat.ind#xpointer(1/1)",
35 UriManager.uri_of_string "cic:/Coq/Reals/Rdefinitions/R.con",
36 UriManager.uri_of_string "cic:/Coq/Reals/Raxioms/INR.con") ;
39 UriManager.uri_of_string "cic:/CoRN/algebra/CFields/CField.ind#xpointer(1/1)",
40 UriManager.uri_of_string "cic:/CoRN/algebra/CRings/CRing.ind#xpointer(1/1)",
41 UriManager.uri_of_string "cic:/CoRN/algebra/CFields/cf_crr.con"
45 UriManager.uri_of_string "cic:/CoRN/algebra/CAbGroups/CAbGroup.ind#xpointer(1/1)",
46 UriManager.uri_of_string "cic:/CoRN/algebra/CGroups/CGroup.ind#xpointer(1/1)",
47 UriManager.uri_of_string "cic:/CoRN/algebra/CAbGroups/cag_crr.con"
54 (* searches a coercion fron src to tgt in the !coercions list *)
55 let look_for_coercion src tgt =
58 List.find (fun (s,t,_) ->
59 UriManager.eq s src &&
63 debug_print (sprintf ":) TROVATA la coercion %s %s"
64 (UriManager.name_of_uri src)
65 (UriManager.name_of_uri tgt));
66 Some (CicUtil.term_of_uri (UriManager.string_of_uri u))
69 debug_print (sprintf ":( NON TROVATA la coercion %s %s"
70 (UriManager.name_of_uri src) (UriManager.name_of_uri tgt));
74 (* given the new coercion uri from src to tgt returns the list
75 * of new coercions to create. hte list elements are
76 * (source, list of coercions to follow, target)
78 let get_closure_coercions src tgt uri =
80 List.filter (fun (f,_,_) ->
85 List.filter (fun (_,t,_) ->
89 (List.map (fun (_,t,u) -> src,[uri; u],t) c_from_tgt) @
90 (List.map (fun (s,_,u) -> s,[u; uri],tgt) c_to_src) @
93 ((List.map (fun (_,t,u2) ->
99 let obj_attrs = [`Class `Coercion; `Generated]
101 (* generate_composite_closure (c2 (c1 s)) in the universe graph univ *)
102 let generate_composite_closure c1 c2 univ =
103 let c1_ty,univ = CicTypeChecker.type_of_aux' [] [] c1 univ in
107 | _ -> (Cic.Rel n) :: (mk_rels (n-1))
111 | Cic.Prod (name,src,tgt) ->
114 | Cic.Anonymous -> Cic.Name "x"
117 Cic.Lambda (name,src,compose (k+1) tgt)
118 | Cic.Appl (he::tl) ->
119 Cic.Appl (c2 :: tl @ [Cic.Appl (c1 :: (mk_rels k)) ])
120 | _ -> Cic.Appl (c2 :: [Cic.Appl (c1 :: (mk_rels k)) ])
122 let c = compose 0 c1_ty in
125 CicTypeChecker.type_of_aux' [] [] c univ
126 with CicTypeChecker.TypeCheckerFailure s as exn ->
127 debug_print (sprintf "Generated composite coercion:\n%s\n%s"
132 FreshNamesGenerator.clean_dummy_dependent_types c_ty
134 let obj = Cic.Constant ("xxxx",Some c,cleaned_ty,[],obj_attrs) in
138 (* removes from l the coercions that are in !coercions *)
139 let filter_duplicates l =
142 not (List.exists (fun (s,t,u) ->
143 UriManager.eq s src &&
148 (* given a new coercion uri from src to tgt returns
149 * a list of (new coercion uri, coercion obj, universe graph)
151 let close_coercion_graph src tgt uri =
152 (* check if the coercion already exists *)
153 let todo_list = get_closure_coercions src tgt uri in
154 let todo_list = filter_duplicates todo_list in
155 let new_coercions, new_coercions_obj =
158 fun (src, l , tgt) ->
162 let term_of_uri' uri =
163 CicUtil.term_of_uri (UriManager.string_of_uri uri)
166 Cic.Constant ("", Some (term_of_uri' he), Cic.Sort Cic.Prop, [],
170 List.fold_left (fun (o,u) coer ->
172 | Cic.Constant (_,Some c,_,[],_) ->
173 generate_composite_closure c (term_of_uri' coer) u
175 ) (first_step, CicUniv.empty_ugraph) tl
177 let name_src = UriManager.name_of_uri src in
178 let name_tgt = UriManager.name_of_uri tgt in
179 let name = name_tgt ^ "_of_" ^ name_src in
180 let buri = UriManager.buri_of_uri uri in
182 UriManager.uri_of_string (buri ^ "/" ^ name ^ ".con")
186 | Cic.Constant (_,bo,ty,vl,attrs) ->
187 Cic.Constant (name,bo,ty,vl,attrs)
190 ((src,tgt,c_uri),(c_uri,named_obj,u))
193 coercions := !coercions @ new_coercions @ [src,tgt,uri];
197 let get_coercions_list () =