--- /dev/null
+(* 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/.
+ *)
+
+open CicReduction
+open ProofEngineTypes
+open UriManager
+
+(** DEBUGGING *)
+
+ (** perform debugging output? *)
+let debug = false
+
+ (** debugging print *)
+let warn s =
+ if debug then
+ prerr_endline ("TACTICALS WARNING: " ^ s)
+
+
+(** TACTIC{,AL}S *)
+
+ (* not a tactical, but it's used only here (?) *)
+
+let id_tac ~status:(proof,goal) =
+ (proof,[goal])
+
+
+ (**
+ naive implementation of ORELSE tactical, try a sequence of tactics in turn:
+ if one fails pass to the next one and so on, eventually raises (failure "no
+ tactics left")
+ TODO warning: not tail recursive due to "try .. with" boxing
+
+ Galla: is this exactly Coq's "First"?
+
+ *)
+let rec try_tactics ~(tactics: (string * tactic) list) ~status =
+ warn "in Tacticals.try_tactics";
+ match tactics with
+ | (descr, tac)::tactics ->
+ warn ("Tacticals.try_tactics IS TRYING " ^ descr);
+ (try
+ let res = tac ~status in
+ warn ("Tacticals.try_tactics: " ^ descr ^ " succedeed!!!");
+ res
+ with
+ e ->
+ match e with
+ (Fail _)
+ | (CicTypeChecker.TypeCheckerFailure (CicTypeChecker.NotWellTyped _))
+ | (CicUnification.UnificationFailed) ->
+ warn (
+ "Tacticals.try_tactics failed with exn: " ^
+ Printexc.to_string e);
+ try_tactics ~tactics ~status
+ | _ -> raise e (* [e] must not be caught ; let's re-raise it *)
+ )
+ | [] -> raise (Fail "try_tactics: no tactics left")
+
+
+
+let thens ~start ~continuations ~status =
+ let (proof,new_goals) = start ~status in
+ try
+ List.fold_left2
+ (fun (proof,goals) goal tactic ->
+ let (proof',new_goals') = tactic ~status:(proof,goal) in
+ (proof',goals@new_goals')
+ ) (proof,[]) new_goals continuations
+ with
+ Invalid_argument _ -> raise (Fail "thens: wrong number of new goals")
+
+
+
+let then_ ~start ~continuation ~status =
+ let (proof,new_goals) = start ~status in
+ List.fold_left
+ (fun (proof,goals) goal ->
+ let (proof',new_goals') = continuation ~status:(proof,goal) in
+ (proof',goals@new_goals')
+ ) (proof,[]) new_goals
+
+
+(* Galla *)
+(* si suppone che tutte le tattiche sollevino solamente Fail? *)
+
+
+(* TODO: x debug: i due tatticali seguenti non contano quante volte hanno applicato la tattica *)
+
+(* This keep on appling tactic until it fails *)
+(* When <tactic> generates more than one goal, you have a tree of
+ application on the tactic, repeat_tactic works in depth on this tree *)
+
+let rec repeat_tactic ~tactic ~status =
+ warn "in repeat_tactic";
+ try let (proof, goallist) = tactic ~status in
+ let rec step proof goallist =
+ match goallist with
+ [] -> (proof, [])
+ | head::tail ->
+ let (proof', goallist') = repeat_tactic ~tactic ~status:(proof, head) in
+ let (proof'', goallist'') = step proof' tail in
+ proof'', goallist'@goallist''
+ in
+ step proof goallist
+ with
+ (Fail _) as e ->
+ warn ("Tacticals.repeat_tactic failed after nth time with exception: " ^ Printexc.to_string e) ;
+ id_tac ~status
+;;
+
+
+
+(* This tries to apply tactic n times *)
+
+let rec do_tactic ~n ~tactic ~status =
+ warn "in do_tactic";
+ try
+ let (proof, goallist) =
+ if (n>0) then tactic ~status
+ else id_tac ~status in
+(* else (proof, []) in *)(* perche' non va bene questo? stessa questione di ##### ? *)
+ let rec step proof goallist =
+ match goallist with
+ [] -> (proof, [])
+ | head::tail ->
+ let (proof', goallist') = do_tactic ~n:(n-1) ~tactic ~status:(proof, head) in
+ let (proof'', goallist'') = step proof' tail in
+ proof'', goallist'@goallist''
+ in
+ step proof goallist
+ with
+ (Fail _) as e ->
+ warn ("Tacticals.do_tactic failed after nth time with exception: " ^ Printexc.to_string e) ;
+ id_tac ~status
+;;
+
+
+
+(* This applies tactic and catches its possible failure *)
+
+let rec try_tactic ~tactic ~status =
+ warn "in Tacticals.try_tactic";
+ try
+ tactic ~status
+ with
+ (Fail _) as e ->
+ warn ( "Tacticals.try_tactic failed with exn: " ^ Printexc.to_string e);
+ id_tac ~status
+;;
+
+
+(* This tries tactics until one of them doesn't _solve_ the goal *)
+(* TODO: si puo' unificare le 2(due) chiamate ricorsive? *)
+
+let rec solve_tactics ~(tactics: (string * tactic) list) ~status =
+ warn "in Tacticals.solve_tactics";
+ match tactics with
+ | (descr, currenttactic)::moretactics ->
+ warn ("Tacticals.solve_tactics is trying " ^ descr);
+ (try
+ let (proof, goallist) = currenttactic ~status in
+ match goallist with
+ [] -> warn ("Tacticals.solve_tactics: " ^ descr ^ " solved the goal!!!");
+(* questo significa che non ci sono piu' goal, o che current_tactic non ne ha aperti di nuovi? (la 2a!) ##### *)
+(* nel secondo caso basta per dire che solve_tactics has solved the goal? (si!) *)
+ (proof, goallist)
+ | _ -> warn ("Tacticals.solve_tactics: try the next tactic");
+ solve_tactics ~tactics:(moretactics) ~status
+ with
+ (Fail _) as e ->
+ warn ("Tacticals.solve_tactics: current tactic failed with exn: " ^ Printexc.to_string e);
+ solve_tactics ~tactics ~status
+ )
+ | [] -> raise (Fail "solve_tactics cannot solve the goal");
+ id_tac ~status
+;;
+
+
+
+
+
+
+
+
+
+
+ (** tattica di prova per debuggare i tatticali *)
+(*
+let thens' ~start ~continuations ~status =
+ let (proof,new_goals) = start ~status in
+ try
+ List.fold_left2
+ (fun (proof,goals) goal tactic ->
+ let (proof',new_goals') = tactic ~status:(proof,goal) in
+ (proof',goals@new_goals')
+ ) (proof,[]) new_goals continuations
+ with
+ Invalid_argument _ -> raise (Fail "thens: wrong number of new goals")
+
+let prova_tac =
+ let apply_T_tac ~status:((proof,goal) as status) =
+ let curi,metasenv,pbo,pty = proof in
+ let metano,context,gty = List.find (function (m,_,_) -> m=goal) metasenv in
+ let rel =
+ let rec find n =
+ function
+ [] -> assert false
+ | (Some (Cic.Name name,_))::_ when name = "T" -> n
+ | _::tl -> find (n+1) tl
+ in
+ prerr_endline ("eseguo find");
+ find 1 context
+ in
+ prerr_endline ("eseguo apply");
+ apply_tac ~term:(Cic.Rel rel) ~status
+ in
+(* do_tactic ~n:2 *)
+ repeat_tactic
+ ~tactic:
+ (then_
+ ~start:(intros_tac ~name:"pippo")
+ ~continuation:(thens' ~start:apply_T_tac ~continuations:[id_tac ; apply_tac ~term:(Cic.Rel 1)]))
+(* id_tac *)
+;;
+*)
+
+
projects / helm.git / blobdiff