beginning of the tactics lapply and fwd

[helm.git] / helm / ocaml / tactics / fwdSimplTactic.ml

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+(* Copyright (C) 2002, HELM Team.
+ * 
+ * This file is part of HELM, an Hypertextual, Electronic
+ * Library of Mathematics, developed at the Computer Science
+ * Department, University of Bologna, Italy.
+ * 
+ * HELM is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 
+ * HELM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HELM; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA  02111-1307, USA.
+ * 
+ * For details, see the HELM World-Wide-Web page,
+ * http://cs.unibo.it/helm/.
+ *)
+
+module MI = CicMkImplicit
+module TC = CicTypeChecker 
+module PET = ProofEngineTypes 
+module U  = CicUniv
+module S = CicSubstitution
+module PT = PrimitiveTactics
+
+(*
+let module R = CicReduction
+*)
+
+let fail_msg0 = "not a declaration of the current context"
+let fail_msg1 = "no applicable simplification"
+
+let error msg = raise (PET.Fail msg)
+
+let rec declaration name = function 
+   | []                                           -> error fail_msg0
+   | Some (hyp, Cic.Decl ty) :: _ when hyp = name -> ty
+   | _ :: tail                                    -> declaration name tail 
+
+(* lapply *******************************************************************)
+
+let lapply_tac ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~subst:[])
+               ?(substs = []) what =
+   let rec strip_dependent_prods metasenv context ss = function
+      | Cic.Prod (name, t1, t2) as t -> 
+        if TC.does_not_occur context 0 1 t2 then metasenv, ss, t else 
+       let metasenv, index = MI.mk_implicit metasenv [] context in 
+       let rs = MI.identity_relocation_list_for_metavariable context in
+        let e, s = Some (name, Cic.Decl t1), Some (Cic.Meta (index, rs)) in
+       strip_dependent_prods metasenv (e :: context) (s :: ss) t2
+      | t    -> metasenv, ss, t
+   in
+   let update_metasenv metasenv ((xuri, _, u,t), goal) =
+      ((xuri, metasenv, u,t), goal)
+   in
+   let lapply_tac status =
+      let (proof, goal) = status in
+      let _,metasenv,_,_ = proof in
+      let _,context,ty = CicUtil.lookup_meta goal metasenv in
+      let lemma, _ = TC.type_of_aux' metasenv context what U.empty_ugraph in
+      let metasenv, substs, stripped_lemma = strip_dependent_prods metasenv context [] lemma in
+      let status = update_metasenv metasenv status in
+      let holed_lemma = S.subst_meta substs stripped_lemma in      
+      PET.apply_tactic (PT.cut_tac ~mk_fresh_name_callback holed_lemma) status
+   in
+   PET.mk_tactic lapply_tac
+
+(* fwd **********************************************************************)
+
+let fwd_simpl_tac ~hyp ~dbd =
+   let fwd_simpl_tac status =
+      let (proof, goal) = status in
+      let _,metasenv,_,_ = proof in
+      let _,context,ty = CicUtil.lookup_meta goal metasenv in
+      let major = declaration hyp context in 
+      match  MetadataQuery.fwd_simpl ~dbd major with
+         | []       -> error fail_msg1
+         | uri :: _ -> prerr_endline uri; (proof, [])  
+   in
+   PET.mk_tactic fwd_simpl_tac