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.
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15 * GNU General Public License for more details.
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26 module MI = CicMkImplicit
27 module TC = CicTypeChecker
28 module PET = ProofEngineTypes
30 module S = CicSubstitution
31 module PT = PrimitiveTactics
33 let fail_msg1 = "no applicable simplification"
35 let error msg = raise (PET.Fail msg)
37 (* lapply *******************************************************************)
39 let lapply_tac ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~subst:[]) what =
40 let rec strip_dependent_prods metasenv context ss = function
41 | Cic.Prod (name, t1, t2) as t ->
42 if TC.does_not_occur context 0 1 t2 then metasenv, ss, t else
43 let metasenv, index = MI.mk_implicit metasenv [] context in
44 let rs = MI.identity_relocation_list_for_metavariable context in
45 let e, s = Some (name, Cic.Decl t1), Some (Cic.Meta (index, rs)) in
46 strip_dependent_prods metasenv (e :: context) (s :: ss) t2
47 | t -> metasenv, ss, t
49 let update_metasenv metasenv ((xuri, _, u,t), goal) =
50 ((xuri, metasenv, u,t), goal)
52 let lapply_tac status =
53 let (proof, goal) = status in
54 let _,metasenv,_,_ = proof in
55 let _,context,ty = CicUtil.lookup_meta goal metasenv in
56 let lemma, _ = TC.type_of_aux' metasenv context what U.empty_ugraph in
57 let metasenv, substs, stripped_lemma = strip_dependent_prods metasenv context [] lemma in
58 let status = update_metasenv metasenv status in
59 let holed_lemma = S.subst_meta substs stripped_lemma in
60 PET.apply_tactic (PT.cut_tac ~mk_fresh_name_callback holed_lemma) status
62 PET.mk_tactic lapply_tac
64 (* fwd **********************************************************************)
66 let fwd_simpl_tac ~term ~dbd =
67 let fwd_simpl_tac status =
68 let (proof, goal) = status in
69 let _,metasenv,_,_ = proof in
70 let _,context,ty = CicUtil.lookup_meta goal metasenv in
72 CicTypeChecker.type_of_aux' metasenv context term CicUniv.empty_ugraph
74 match MetadataQuery.fwd_simpl ~dbd major with
75 | [] -> error fail_msg1
76 | uri :: _ -> prerr_endline (UriManager.string_of_uri uri); (proof, [])
78 PET.mk_tactic fwd_simpl_tac