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/.
27 (* TODO se ce n'e' piu' di una, prende la prima che trova... sarebbe meglio
28 chiedere: find dovrebbe restituire una lista di hyp (?) da passare all'utonto con una
29 funzione di callback che restituisce la (sola) hyp da applicare *)
32 let module PET = ProofEngineTypes in
33 let assumption_tac status =
34 let (proof, goal) = status in
36 let module R = CicReduction in
37 let module S = CicSubstitution in
38 let module PT = PrimitiveTactics in
39 let _,metasenv,_,_ = proof in
40 let _,context,ty = CicUtil.lookup_meta goal metasenv in
41 let rec find n = function
44 (Some (_, C.Decl t)) when
45 fst (R.are_convertible context (S.lift n t) ty
46 CicUniv.empty_ugraph) -> n
47 | (Some (_, C.Def (_,Some ty'))) when
48 fst (R.are_convertible context (S.lift n ty') ty
49 CicUniv.empty_ugraph) -> n
50 | (Some (_, C.Def (t,None))) ->
51 let ty_t, u = (* TASSI: FIXME *)
52 CicTypeChecker.type_of_aux' metasenv context (S.lift n t)
53 CicUniv.empty_ugraph in
54 let b,_ = R.are_convertible context ty_t ty u in
55 if b then n else find (n+1) tl
58 | [] -> raise (PET.Fail "Assumption: No such assumption")
59 in PET.apply_tactic (PT.apply_tac ~term:(C.Rel (find 1 context))) status
61 PET.mk_tactic assumption_tac
64 (* ANCORA DA DEBUGGARE *)
66 exception UnableToDetectTheTermThatMustBeGeneralizedYouMustGiveItExplicitly;;
67 exception TheSelectedTermsMustLiveInTheGoalContext
68 exception AllSelectedTermsMustBeConvertible;;
69 exception GeneralizationInHypothesesNotImplementedYet;;
71 (* serve una funzione che cerchi nel ty dal basso a partire da term, i lambda
72 e li aggiunga nel context, poi si conta la lunghezza di questo nuovo
73 contesto e si lifta di tot... COSA SIGNIFICA TUTTO CIO'?????? *)
76 ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~subst:[])
79 let module PET = ProofEngineTypes in
80 let generalize_tac mk_fresh_name_callback
81 ~pattern:(term,hyps_pat,concl_pat) status
83 if hyps_pat <> [] then raise GeneralizationInHypothesesNotImplementedYet;
84 let (proof, goal) = status in
86 let module P = PrimitiveTactics in
87 let module T = Tacticals in
88 let _,metasenv,_,_ = proof in
89 let (_,context,ty) as conjecture = CicUtil.lookup_meta goal metasenv in
90 let selected_hyps,terms_with_context =
91 ProofEngineHelpers.select ~metasenv ~conjecture ~pattern in
93 match terms_with_context, term with
95 raise UnableToDetectTheTermThatMustBeGeneralizedYouMustGiveItExplicitly
97 | (_,term)::_, None ->
99 (CicTypeChecker.type_of_aux' metasenv context term
100 CicUniv.empty_ugraph),
103 1. whether they live in the context of the goal;
104 if they do they are also well-typed since they are closed subterms
105 of a well-typed term in the well-typed context of the well-typed
107 2. whether they are convertible
112 (fun u (context_of_t,t) ->
117 (CicMetaSubst.delift_rels [] metasenv
118 (List.length context_of_t - List.length context) t)
120 CicMetaSubst.DeliftingARelWouldCaptureAFreeVariable ->
121 raise TheSelectedTermsMustLiveInTheGoalContext
124 let b,u1 = CicReduction.are_convertible context term t u in
126 raise AllSelectedTermsMustBeConvertible
129 ) CicUniv.empty_ugraph terms_with_context) ;
135 (mk_fresh_name_callback metasenv context C.Anonymous ~typ:typ),
137 (ProofEngineReduction.replace_lifting_csc 1
139 ~what:(List.map snd terms_with_context)
140 ~with_what:(List.map (function _ -> C.Rel 1) terms_with_context)
144 [(P.apply_tac ~term:(C.Appl [C.Rel 1; CicSubstitution.lift 1 term])) ;
148 PET.mk_tactic (generalize_tac mk_fresh_name_callback ~pattern)