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.
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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/.
30 type coercion_search_result =
31 (* metasenv, last coercion argument, fully saturated coercion *)
32 (* to apply the coercion it is sufficient to unify the last coercion
33 argument (that is a Meta) with the term to be coerced *)
34 | SomeCoercion of (Cic.metasenv * Cic.term * Cic.term) list
37 | NotHandled of string Lazy.t
40 let debug_print s = if debug then prerr_endline (Lazy.force s) else ()
42 (* searches a coercion fron src to tgt in the !coercions list *)
43 let look_for_coercion' metasenv subst context src tgt =
47 (fun (s,t) -> CoercDb.eq_carr s src && CoercDb.eq_carr t tgt) in
53 (sprintf ":-( coercion non trovata da %s a %s"
54 (CoercDb.name_of_carr src)
55 (CoercDb.name_of_carr tgt)));
59 sprintf ":-) TROVATE %d coercion(s) da %s a %s"
61 (CoercDb.name_of_carr src)
62 (CoercDb.name_of_carr tgt)));
68 let cl = List.map CicUtil.term_of_uri ul in
70 let _,tgtcarl = List.split (List.map CoercDb.get_carr ul) in
71 List.map (function CoercDb.Fun i -> i | _ -> 0) tgtcarl
73 let freshmeta = CicMkImplicit.new_meta metasenv subst in
78 CicTypeChecker.type_of_aux' ~subst metasenv context c
79 CicUniv.empty_ugraph in
80 let _,metasenv,args,lastmeta =
81 TermUtil.saturate_term freshmeta metasenv context ty arity in
83 CicMkImplicit.identity_relocation_list_for_metavariable context
85 metasenv, Cic.Meta (lastmeta-1,irl),
88 | _ -> Cic.Appl (c::args)
93 | CoercDb.EqCarrNotImplemented s -> NotHandled s
94 | CoercDb.EqCarrOnNonMetaClosed -> NotMetaClosed
97 let look_for_coercion metasenv subst context src tgt =
98 let src_uri = CoercDb.coerc_carr_of_term src in
99 let tgt_uri = CoercDb.coerc_carr_of_term tgt in
100 look_for_coercion' metasenv subst context src_uri tgt_uri
104 let uri = CicUtil.uri_of_term t in
105 CoercDb.term_of_carr (fst (CoercDb.get_carr uri))
106 with Invalid_argument _ -> assert false (* t must be a coercion *)
108 let generate_dot_file () =
109 let module Pp = GraphvizPp.Dot in
110 let buf = Buffer.create 10240 in
111 let fmt = Format.formatter_of_buffer buf in
112 Pp.header ~node_attrs:["fontsize", "9"; "width", ".4"; "height", ".4"]
113 ~edge_attrs:["fontsize", "10"] fmt;
114 let l = CoercDb.to_list () in
115 let pp_description carr =
116 match CoercDb.uri_of_carr carr with
119 Pp.node (CoercDb.name_of_carr carr)
120 ~attrs:["href", UriManager.string_of_uri uri] fmt in
122 (fun (src, tgt, cl) ->
123 let src_name = CoercDb.name_of_carr src in
124 let tgt_name = CoercDb.name_of_carr tgt in
129 Pp.edge src_name tgt_name
130 ~attrs:[ "label", UriManager.name_of_uri c;
131 "href", UriManager.string_of_uri c ]
143 | Cic.Appl (he::_) -> CicUtil.uri_of_term he
144 | _ -> CicUtil.uri_of_term t
146 match CicEnvironment.get_obj CicUniv.empty_ugraph uri with
147 | Cic.Constant (_,_, _, _, attrs),_ ->
148 List.exists (function `Class (`Coercion _) -> true | _ -> false) attrs
150 with Invalid_argument _ -> false
153 let uniq = HExtlib.list_uniq ~eq:(fun (a,_) (b,_) -> CoercDb.eq_carr a b);;
155 let splat e l = List.map (fun x -> e, x) l;;
157 let get_coercions_to carr =
158 let l = CoercDb.to_list () in
162 if CoercDb.eq_carr tgt carr then Some (splat src cl) else None)
166 let get_coercions_from carr =
167 let l = CoercDb.to_list () in
171 if CoercDb.eq_carr src carr then Some (splat tgt cl) else None)
175 let intersect l1 l2 =
176 let is_in_l1 (x,_) = List.exists (fun (src,_) -> CoercDb.eq_carr x src) l1 in
177 uniq (List.filter is_in_l1 l2)
181 uniq (List.flatten (List.map (fun (x,_) -> get_coercions_to x) s) @ s)
185 let l = get_coercions_from c in
186 function x -> List.exists (fun (y,_) -> CoercDb.eq_carr x y) l
189 let rec min acc = function
191 if List.exists (lb c) (tl@acc) then min acc tl else min (c::acc) tl
195 let meets left right =
196 let u = UriManager.uri_of_string "cic:/foo.con" in
197 min [] (List.map fst (intersect (grow [left,u]) (grow [right,u])))