1 (* Copyright (C) 2002, 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/.
26 (* identity_relocation_list_for_metavariable i canonical_context *)
27 (* returns the identity relocation list, which is the list [1 ; ... ; n] *)
28 (* where n = List.length [canonical_context] *)
29 (*CSC: ma mi basta la lunghezza del contesto canonico!!!*)
30 let identity_relocation_list_for_metavariable canonical_context =
31 let canonical_context_length = List.length canonical_context in
35 | (n,None::tl) -> None::(aux ((n+1),tl))
36 | (n,_::tl) -> (Some (Cic.Rel n))::(aux ((n+1),tl))
38 aux (1,canonical_context)
40 (* Returns the first meta whose number is above the *)
41 (* number of the higher meta. *)
43 let (_,metasenv,_,_) = proof in
48 | None,(n,_,_)::tl -> aux (Some n,tl)
49 | Some m,(n,_,_)::tl -> if n > m then aux (Some n,tl) else aux (Some m,tl)
51 1 + aux (None,metasenv)
53 let subst_meta_in_proof proof meta term newmetasenv =
54 let uri,metasenv,bo,ty = proof in
55 let subst_in = CicUnification.apply_subst [meta,term] in
57 newmetasenv @ (List.filter (function (m,_,_) -> m <> meta) metasenv)
61 (function i,canonical_context,ty ->
62 let canonical_context' =
65 Some (n,Cic.Decl s) -> Some (n,Cic.Decl (subst_in s))
66 | Some (n,Cic.Def s) -> Some (n,Cic.Def (subst_in s))
70 i,canonical_context',(subst_in ty)
73 let bo' = subst_in bo in
74 let newproof = uri,metasenv'',bo',ty in
75 (newproof, metasenv'')
77 (*CSC: commento vecchio *)
78 (* refine_meta_with_brand_new_metasenv meta term subst_in newmetasenv *)
79 (* This (heavy) function must be called when a tactic can instantiate old *)
80 (* metavariables (i.e. existential variables). It substitues the metasenv *)
81 (* of the proof with the result of removing [meta] from the domain of *)
82 (* [newmetasenv]. Then it replaces Cic.Meta [meta] with [term] everywhere *)
83 (* in the current proof. Finally it applies [apply_subst_replacing] to *)
85 (*CSC: A questo punto perche' passare un bo' gia' istantiato, se tanto poi *)
86 (*CSC: ci ripasso sopra apply_subst!!! *)
87 (*CSC: Attenzione! Ora questa funzione applica anche [subst_in] a *)
88 (*CSC: [newmetasenv]. *)
89 let subst_meta_and_metasenv_in_proof proof meta subst_in newmetasenv =
90 let (uri,_,bo,ty) = proof in
91 let bo' = subst_in bo in
94 (fun metasenv_entry i ->
95 match metasenv_entry with
96 (m,canonical_context,ty) when m <> meta ->
97 let canonical_context' =
101 | Some (i,Cic.Decl t) -> Some (i,Cic.Decl (subst_in t))
102 | Some (i,Cic.Def t) -> Some (i,Cic.Def (subst_in t))
105 (m,canonical_context',subst_in ty)::i
109 let newproof = uri,metasenv',bo',ty in
110 (newproof, metasenv')