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
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9 * as published by the Free Software Foundation; either version 2
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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.
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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 MI = CicMkImplicit
27 module TC = CicTypeChecker
28 module PET = ProofEngineTypes
30 module S = CicSubstitution
31 module PT = PrimitiveTactics
34 let module R = CicReduction
37 let fail_msg0 = "not a declaration of the current context"
38 let fail_msg1 = "no applicable simplification"
40 let error msg = raise (PET.Fail msg)
42 let rec declaration name = function
43 | [] -> error fail_msg0
44 | Some (hyp, Cic.Decl ty) :: _ when hyp = name -> ty
45 | _ :: tail -> declaration name tail
47 (* lapply *******************************************************************)
49 let lapply_tac ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~subst:[])
51 let rec strip_dependent_prods metasenv context ss = function
52 | Cic.Prod (name, t1, t2) as t ->
53 if TC.does_not_occur context 0 1 t2 then metasenv, ss, t else
54 let metasenv, index = MI.mk_implicit metasenv [] context in
55 let rs = MI.identity_relocation_list_for_metavariable context in
56 let e, s = Some (name, Cic.Decl t1), Some (Cic.Meta (index, rs)) in
57 strip_dependent_prods metasenv (e :: context) (s :: ss) t2
58 | t -> metasenv, ss, t
60 let update_metasenv metasenv ((xuri, _, u,t), goal) =
61 ((xuri, metasenv, u,t), goal)
63 let lapply_tac status =
64 let (proof, goal) = status in
65 let _,metasenv,_,_ = proof in
66 let _,context,ty = CicUtil.lookup_meta goal metasenv in
67 let lemma, _ = TC.type_of_aux' metasenv context what U.empty_ugraph in
68 let metasenv, substs, stripped_lemma = strip_dependent_prods metasenv context [] lemma in
69 let status = update_metasenv metasenv status in
70 let holed_lemma = S.subst_meta substs stripped_lemma in
71 PET.apply_tactic (PT.cut_tac ~mk_fresh_name_callback holed_lemma) status
73 PET.mk_tactic lapply_tac
75 (* fwd **********************************************************************)
77 let fwd_simpl_tac ~hyp ~dbd =
78 let fwd_simpl_tac status =
79 let (proof, goal) = status in
80 let _,metasenv,_,_ = proof in
81 let _,context,ty = CicUtil.lookup_meta goal metasenv in
82 let major = declaration hyp context in
83 match MetadataQuery.fwd_simpl ~dbd major with
84 | [] -> error fail_msg1
85 | uri :: _ -> prerr_endline (UriManager.string_of_uri uri); (proof, [])
87 PET.mk_tactic fwd_simpl_tac