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

diff --git a/helm/ocaml/tactics/reductionTactics.ml b/helm/ocaml/tactics/reductionTactics.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/.
- *)
-
-(*
-let reduction_tac ~reduction ~status:(proof,goal) =
- let curi,metasenv,pbo,pty = proof in
- let metano,context,ty = List.find (function (m,_,_) -> m=goal) metasenv in
-  let new_ty = reduction context ty in
-   let new_metasenv = 
-    List.map
-    (function
-      (n,_,_) when n = metano -> (metano,context,new_ty)
-      | _ as t -> t
-    ) metasenv
-   in
-    (curi,new_metasenv,pbo,pty), [metano]
-;;
-*)
-
-(* The default of term is the thesis of the goal to be prooved *)
-let reduction_tac ~also_in_hypotheses ~reduction ~terms ~status:(proof,goal) =
- let curi,metasenv,pbo,pty = proof in
- let metano,context,ty = List.find (function (m,_,_) -> m=goal) metasenv in
-  let terms =
-   match terms with None -> [ty] | Some l -> l
-  in
-  (* We don't know if [term] is a subterm of [ty] or a subterm of *)
-  (* the type of one metavariable. So we replace it everywhere.   *)
-  (*CSC: Il vero problema e' che non sapendo dove sia il term non *)
-  (*CSC: sappiamo neppure quale sia il suo contesto!!!! Insomma,  *)
-  (*CSC: e' meglio prima cercare il termine e scoprirne il        *)
-  (*CSC: contesto, poi ridurre e infine rimpiazzare.              *)
-   let replace context where=
-(*CSC: Per il momento se la riduzione fallisce significa solamente che *)
-(*CSC: siamo nel contesto errato. Metto il try, ma che schifo!!!!      *)
-(*CSC: Anche perche' cosi' catturo anche quelle del replace che non dovrei *)
-   try
-    let terms' = List.map (reduction context) terms in
-     ProofEngineReduction.replace ~equality:(==) ~what:terms ~with_what:terms'
-      ~where:where
-   with
-    _ -> where
-   in
-    let ty' = replace context ty in
-    let context' =
-     if also_in_hypotheses then
-      List.fold_right
-       (fun entry context ->
-         match entry with
-            Some (name,Cic.Def  t) ->
-             (Some (name,Cic.Def  (replace context t)))::context
-          | Some (name,Cic.Decl t) ->
-             (Some (name,Cic.Decl (replace context t)))::context
-          | None -> None::context
-       ) context []
-     else
-      context
-    in
-     let metasenv' = 
-      List.map
-       (function
-           (n,_,_) when n = metano -> (metano,context',ty')
-         | _ as t -> t
-       ) metasenv
-     in
-      (curi,metasenv',pbo,pty), [metano]
-;;
-
-let simpl_tac = reduction_tac ~reduction:ProofEngineReduction.simpl ;;
-let reduce_tac = reduction_tac ~reduction:ProofEngineReduction.reduce ;;
-let whd_tac = reduction_tac ~reduction:CicReduction.whd ;;
-
-let fold_tac ~reduction ~also_in_hypotheses ~term ~status:(proof,goal) =
- let curi,metasenv,pbo,pty = proof in
- let metano,context,ty = List.find (function (m,_,_) -> m=goal) metasenv in
-  let term' = reduction context term in
-   (* We don't know if [term] is a subterm of [ty] or a subterm of *)
-   (* the type of one metavariable. So we replace it everywhere.   *)
-   (*CSC: ma si potrebbe ovviare al problema. Ma non credo *)
-   (*CSC: che si guadagni nulla in fatto di efficienza.    *) 
-   let replace =
-    ProofEngineReduction.replace ~equality:(=) ~what:[term'] ~with_what:[term]
-   in
-    let ty' = replace ty in
-    let metasenv' =
-     let context' =
-      if also_in_hypotheses then
-       List.map
-        (function
-            Some (n,Cic.Decl t) -> Some (n,Cic.Decl (replace t))
-          | Some (n,Cic.Def t)  -> Some (n,Cic.Def  (replace t))
-          | None -> None
-        ) context
-      else
-       context
-     in
-      List.map
-       (function
-           (n,_,_) when n = metano -> (metano,context',ty')
-         | _ as t -> t
-       ) metasenv
-     
-    in
-     (curi,metasenv',pbo,pty), [metano]
-;;