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/.
26 (* AUTOR: Ferruccio Guidi <fguidi@cs.unibo.it>
31 let text_of_entries out entries =
32 out "(** MatchConclusion: results of the term inspection **)\n";
33 let text_of_entry (u, b, v) =
34 out (string_of_int v ^ " ");
35 out (if b then "$MC " else "$IC ");
37 in List.iter text_of_entry entries
39 let sort_entries entries =
40 let comparator (_, _, v1) (_, _, v2) = compare v1 v2 in
41 List.fast_sort comparator entries
43 let levels_of_term metasenv context term =
44 let module TC = CicTypeChecker in
45 let module Red = CicReduction in
47 let rec degree_aux = function
49 | Cic.Cast (u, _) -> degree_aux u
50 | Cic.Prod (_, _, t) -> degree_aux t
53 let u,_ = TC.type_of_aux' metasenv context t CicUniv.empty_ugraph in
54 degree_aux (Red.whd context u)
56 let entry_eq (s1, b1, v1) (s2, b2, v2) =
59 let rec entry_in e = function
62 head :: if entry_eq head e then tail else entry_in e tail
64 let inspect_uri main l uri tc v term =
65 let d = degree term in
66 entry_in (UriManager.string_of_uriref (uri, tc), main, 2 * v + d - 1) l
68 let rec inspect_term main l v term = match term with
73 | Cic.Var (u,exp_named_subst) ->
74 inspect_exp_named_subst l (succ v) exp_named_subst
76 let l' = inspect_uri main l u [] v term in
77 inspect_exp_named_subst l' (succ v) exp_named_subst
79 | Cic.Const (u,exp_named_subst) ->
80 let l' = inspect_uri main l u [] v term in
81 inspect_exp_named_subst l' (succ v) exp_named_subst
82 | Cic.MutInd (u, t, exp_named_subst) ->
83 let l' = inspect_uri main l u [t] v term in
84 inspect_exp_named_subst l' (succ v) exp_named_subst
85 | Cic.MutConstruct (u, t, c, exp_named_subst) ->
86 let l' = inspect_uri main l u [t; c] v term in
87 inspect_exp_named_subst l' (succ v) exp_named_subst
89 inspect_term main l v uu
90 | Cic.Prod (_, uu, tt) ->
91 let luu = inspect_term false l (succ v) uu in
92 inspect_term main luu (succ v) tt
93 | Cic.Lambda (_, uu, tt) ->
94 let luu = inspect_term false l (succ v) uu in
95 inspect_term false luu (succ v) tt
96 | Cic.LetIn (_, uu, tt) ->
97 let luu = inspect_term false l (succ v) uu in
98 inspect_term false luu (succ v) tt
99 | Cic.Appl m -> inspect_list main l true v m
100 | Cic.MutCase (u, t, tt, uu, m) ->
101 let lu = inspect_uri main l u [t] (succ v) term in
102 let ltt = inspect_term false lu (succ v) tt in
103 let luu = inspect_term false ltt (succ v) uu in
104 inspect_list main luu false (succ v) m
105 | Cic.Fix (_, m) -> inspect_ind l (succ v) m
106 | Cic.CoFix (_, m) -> inspect_coind l (succ v) m
107 and inspect_list main l head v = function
110 let ltt = inspect_term main l (if head then v else v + 1) tt in
111 inspect_list false ltt false v m
112 and inspect_exp_named_subst l v = function
115 let l' = inspect_term false l v t in
116 inspect_exp_named_subst l' v tl
117 and inspect_ind l v = function
119 | (_, _, tt, uu) :: m ->
120 let ltt = inspect_term false l v tt in
121 let luu = inspect_term false ltt v uu in
123 and inspect_coind l v = function
125 | (_, tt, uu) :: m ->
126 let ltt = inspect_term false l v tt in
127 let luu = inspect_term false ltt v uu in
128 inspect_coind luu v m
130 let rec inspect_backbone = function
131 | Cic.Cast (uu, _) -> inspect_backbone uu
132 | Cic.Prod (_, _, tt) -> inspect_backbone tt
133 | Cic.LetIn (_, uu, tt) -> inspect_backbone tt
134 | t -> inspect_term true [] 0 t
136 inspect_backbone term
138 let get_constraints e c t =
139 let can = sort_entries (levels_of_term e c t) in (* can restrictions *)
140 text_of_entries prerr_string can; flush stderr; (* logging *)
141 let rest_of (u, b, _) =
142 let p = if b then `MainConclusion None else `InConclusion in (p, u)
144 let rec split vp = function
145 | [], ((_, _, v) as hd) :: tl -> split v ([rest_of hd], tl)
146 | prev, ((_, _, ve) as hd) :: tl when vp = ve ->
147 split vp (rest_of hd :: prev, tl)
150 let rec mk_musts prev acc = function
153 let slice, next = split 0 ([], l) in
154 let acc = acc @ slice in
155 mk_musts (prev @ [acc]) acc next
159 let universe = [T.MainConclusion; T.InConclusion]