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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23 * http://cs.unibo.it/helm/.
26 module MI = CicMkImplicit
27 module TC = CicTypeChecker
28 module PET = ProofEngineTypes
29 module PEH = ProofEngineHelpers
31 module S = CicSubstitution
32 module PT = PrimitiveTactics
35 let fail_msg1 = "no applicable simplification"
37 let error msg = raise (PET.Fail msg)
39 (* lapply *******************************************************************)
41 let lapply_tac ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~subst:[])
42 (* ?(substs = []) *) ?to_what what =
43 let cut_tac term = PT.cut_tac ~mk_fresh_name_callback term in
44 let apply_tac term = PT.apply_tac term in
45 let strip_dependent_prods metasenv context t =
46 let irl = MI.identity_relocation_list_for_metavariable context in
47 let rec aux metasenv p xcontext = function
48 | Cic.Prod (name, t1, t2) when not (TC.does_not_occur xcontext 0 1 t2) ->
49 let index = MI.new_meta metasenv [] in
50 let metasenv = [index, context, t1] @ metasenv in
51 let e, s = Some (name, Cic.Decl t1), Cic.Meta (index, irl) in
52 aux metasenv (succ p) (e :: xcontext) (S.subst s t2)
53 | Cic.Prod (name, t1, t2) -> metasenv, p, Some t1, t2
54 | t -> metasenv, p, None, t
56 aux metasenv 0 context t
58 let rec mk_continuations p l =
59 if p <= 0 then l else mk_continuations (pred p) (T.id_tac :: l)
61 let lapply_tac (proof, goal) =
62 let xuri, metasenv, u, t = proof in
63 let _, context, _ = CicUtil.lookup_meta goal metasenv in
64 let lemma, _ = TC.type_of_aux' metasenv context what U.empty_ugraph in
65 match strip_dependent_prods metasenv context lemma with
66 | metasenv, p, Some premise, conclusion ->
70 | Some term -> PT.apply_tac term
72 let status = (xuri, metasenv, u, t), goal in
73 let tac = T.thens ~start:(cut_tac premise)
75 T.thens ~start:(cut_tac conclusion)
76 ~continuations:[ T.id_tac;
77 T.thens ~start:(PT.apply_tac what)
78 ~continuations:(mk_continuations p [PT.apply_tac ~term:(Cic.Rel 1)])
81 PET.apply_tactic tac status
82 | metasenv, p, None, conclusion ->
83 failwith "lapply_tac: not implemented"
85 PET.mk_tactic lapply_tac
96 let count_dependent_prods context t =
97 let rec aux context p = function
98 | Cic.Prod (name, t1, t2) ->
99 if TC.does_not_occur context 0 1 t2 then p else
100 let e = Some (name, Cic.Decl t1) in
101 aux (e :: context) (succ p) t2
106 let rec pad_context p context add_context =
107 if List.length add_context >= p then add_context @ context
108 else pad_context p context (None :: add_context)
110 let strip_dependent_prods metasenv context p t =
111 let rec aux metasenv add_context q = function
112 | Cic.Prod (name, t1, t2) when q > 0 ->
113 let context_for_meta = pad_context p context add_context in
114 let metasenv, index = MI.mk_implicit metasenv [] context_for_meta in
115 let rs = MI.identity_relocation_list_for_metavariable context_for_meta in
116 let e, s = Some (name, Cic.Decl t1), Cic.Meta (index, rs) in
117 aux metasenv (e :: add_context) (pred q) (S.subst s t2)
118 | t -> metasenv, add_context, t
122 let mk_body bo = function
123 | Some (name, Cic.Decl t1) -> Cic.Lambda (name, t1, bo)
124 | _ -> failwith "mk_body"
126 let lapply_tac (proof, goal) =
127 let xuri, metasenv, u, t = proof in
129 let metano, context, ty = CicUtil.lookup_meta goal metasenv in
130 let lemma, _ = TC.type_of_aux' metasenv context what U.empty_ugraph in
131 let p = count_dependent_prods context lemma in
133 let metasenv, add_context, holed_lemma = strip_dependent_prods metasenv context p lemma in
134 let proof = xuri, metasenv, u, t in
135 let newmeta = MI.new_meta metasenv [] in
136 let context = add_context @ context in
137 let irl = MI.identity_relocation_list_for_metavariable context in
138 let bo = List.fold_left mk_body (Cic.Meta (newmeta, irl)) add_context in
139 let ty = S.lift p ty in
140 let (xuri, metasenv, u, t), _ =
141 PEH.subst_meta_in_proof proof metano bo [newmeta, context, ty]
143 prerr_endline (CicPp.ppterm holed_lemma);
145 let status = (xuri, metasenv, u, t), newmeta in
146 PET.apply_tactic (PT.cut_tac ~mk_fresh_name_callback holed_lemma) status
148 PET.mk_tactic lapply_tac
150 (* fwd **********************************************************************)
152 let fwd_simpl_tac ~what ~dbd =
153 let fwd_simpl_tac status =
154 let (proof, goal) = status in
155 let _, metasenv, _, _ = proof in
156 let _, context, ty = CicUtil.lookup_meta goal metasenv in
157 let major, _ = TC.type_of_aux' metasenv context what U.empty_ugraph in
158 match MetadataQuery.fwd_simpl ~dbd major with
159 | [] -> error fail_msg1
160 | uri :: _ -> prerr_endline (UriManager.string_of_uri uri); (proof, [])
162 PET.mk_tactic fwd_simpl_tac