1 (* Copyright (C) 2003-2005, 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://cs.unibo.it/helm/.
26 module UM = UriManager
30 module PEH = ProofEngineHelpers
32 module H = ProceduralHelpers
34 type dependences = (I.S.t * bool) list
36 type conclusion = (int * int * UM.uri * int) option
38 (* debugging ****************************************************************)
40 let string_of_entry (inverse, b) =
41 if I.S.mem 0 inverse then begin if b then "CF" else "C" end else
42 if I.S.is_empty inverse then "I" else "P"
44 let to_string (classes, rc) =
45 let linearize = String.concat " " (List.map string_of_entry classes) in
48 | Some (i, j, _, _) -> Printf.sprintf "%s %u %u" linearize i j
51 let map i (_, inverse) =
52 let map i tl = Printf.sprintf "%2u" i :: tl in
53 let iset = String.concat " " (I.S.fold map inverse []) in
54 Printf.eprintf "%2u|%s\n" i iset
59 (* dummy dependences ********************************************************)
62 let map _ = I.S.empty, false in
65 (* classification ***********************************************************)
67 let classify_conclusion vs =
68 let rec get_argsno = function
69 | c, C.Appl (t :: vs) ->
70 let hd, argsno = get_argsno (c, t) in
71 hd, argsno + List.length vs
74 let inside i = i > 1 && i <= List.length vs in
77 let hd0, a0 = get_argsno v0 in
78 let hd1, a1 = get_argsno v1 in
79 begin match hd0, hd1 with
80 | C.Rel i, C.MutInd (u, n, _) when inside i -> Some (i, a0, u, n)
87 let vs, h = PEH.split_with_whd (c, t) in
88 let rc = classify_conclusion vs in
89 let map (b, h) (c, v) =
90 let _, argsno = PEH.split_with_whd (c, v) in
91 let isf = argsno > 0 || H.is_sort v in
92 let iu = H.is_unsafe h (List.hd vs) in
93 (I.get_rels_from_premise h v, I.S.empty, isf && iu) :: b, succ h
95 let l, h = List.fold_left map ([], 0) vs in
96 let b = Array.of_list (List.rev l) in
98 let map j = if j < h then I.S.union (H.fst3 b.(j)) else H.identity in
99 for i = pred h downto 0 do
100 let direct, unused, fa = b.(i) in
101 b.(i) <- I.S.fold map direct direct, unused, fa
104 let b = mk_closure b h in
105 let rec mk_inverse i direct =
106 if I.S.is_empty direct then () else
107 let j = I.S.choose direct in
109 let unused, inverse, fa = b.(j) in
110 b.(j) <- unused, I.S.add i inverse, fa
112 mk_inverse i (I.S.remove j direct)
114 let map i (direct, _, _) = mk_inverse i direct in
117 let extract (x, y, z) = y, z in
118 List.rev_map extract (List.tl (Array.to_list b)), rc
119 with Invalid_argument _ -> failwith "Classify.classify"
121 (* adjusting the inferrable arguments that do not occur in the goal *********)
123 let adjust c vs ?goal classes =
124 let list_xmap2 map l1 l2 =
125 let rec aux a = function
126 | hd1 :: tl1, hd2 :: tl2 -> aux (map hd1 hd2 :: a) (tl1,tl2)
127 | _, l2 -> List.rev_append l2 a
129 List.rev (aux [] (l1, l2))
131 let map where what (i, b) =
132 let what = H.cic what in
133 (i, b || not (H.occurs c ~what ~where))
137 | Some goal -> list_xmap2 (map goal) vs classes