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.
7 * HELM is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with HELM; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22 * For details, see the HELM World-Wide-Web page,
23 * http://cs.unibo.it/helm/.
32 (** perform debugging output? *)
35 (** debugging print *)
38 prerr_endline ("TACTICALS WARNING: " ^ s)
43 (* not a tactical, but it's used only here (?) *)
45 let id_tac (proof,goal) = (proof,[goal])
49 naive implementation of ORELSE tactical, try a sequence of tactics in turn:
50 if one fails pass to the next one and so on, eventually raises (failure "no
52 TODO warning: not tail recursive due to "try .. with" boxing
54 Galla: is this exactly Coq's "First"?
57 let rec try_tactics ~(tactics: (string * tactic) list) status =
58 warn "in Tacticals.try_tactics";
60 | (descr, tac)::tactics ->
61 warn ("Tacticals.try_tactics IS TRYING " ^ descr);
63 let res = tac status in
64 warn ("Tacticals.try_tactics: " ^ descr ^ " succedeed!!!");
70 | (CicTypeChecker.TypeCheckerFailure _)
71 | (CicUnification.UnificationFailure _) ->
73 "Tacticals.try_tactics failed with exn: " ^
74 Printexc.to_string e);
75 try_tactics ~tactics status
76 | _ -> raise e (* [e] must not be caught ; let's re-raise it *)
78 | [] -> raise (Fail "try_tactics: no tactics left")
82 let thens ~start ~continuations status =
83 let (proof,new_goals) = start status in
86 (fun (proof,goals) goal tactic ->
87 let (proof',new_goals') = tactic (proof,goal) in
88 (proof',goals@new_goals')
89 ) (proof,[]) new_goals continuations
91 Invalid_argument _ -> raise (Fail "thens: wrong number of new goals")
95 let then_ ~start ~continuation status =
96 let (proof,new_goals) = start status in
98 (fun (proof,goals) goal ->
99 let (proof',new_goals') = continuation (proof,goal) in
100 (proof',goals@new_goals')
101 ) (proof,[]) new_goals
105 (* si suppone che tutte le tattiche sollevino solamente Fail? *)
108 (* TODO: x debug: i due tatticali seguenti non contano quante volte hanno applicato la tattica *)
110 (* This keep on appling tactic until it fails *)
111 (* When <tactic> generates more than one goal, you have a tree of
112 application on the tactic, repeat_tactic works in depth on this tree *)
114 let rec repeat_tactic ~tactic status =
115 warn "in repeat_tactic";
116 try let (proof, goallist) = tactic status in
117 let rec step proof goallist =
121 let (proof', goallist') = repeat_tactic ~tactic (proof, head) in
122 let (proof'', goallist'') = step proof' tail in
123 proof'', goallist'@goallist''
128 warn ("Tacticals.repeat_tactic failed after nth time with exception: " ^ Printexc.to_string e) ;
134 (* This tries to apply tactic n times *)
136 let rec do_tactic ~n ~tactic status =
139 let (proof, goallist) =
140 if (n>0) then tactic status
141 else id_tac status in
142 (* else (proof, []) in *)(* perche' non va bene questo? stessa questione di ##### ? *)
143 let rec step proof goallist =
147 let (proof', goallist') = do_tactic ~n:(n-1) ~tactic (proof, head) in
148 let (proof'', goallist'') = step proof' tail in
149 proof'', goallist'@goallist''
154 warn ("Tacticals.do_tactic failed after nth time with exception: " ^ Printexc.to_string e) ;
160 (* This applies tactic and catches its possible failure *)
162 let rec try_tactic ~tactic status =
163 warn "in Tacticals.try_tactic";
168 warn ( "Tacticals.try_tactic failed with exn: " ^ Printexc.to_string e);
173 (* This tries tactics until one of them doesn't _solve_ the goal *)
174 (* TODO: si puo' unificare le 2(due) chiamate ricorsive? *)
176 let rec solve_tactics ~(tactics: (string * tactic) list) status =
177 warn "in Tacticals.solve_tactics";
179 | (descr, currenttactic)::moretactics ->
180 warn ("Tacticals.solve_tactics is trying " ^ descr);
182 let (proof, goallist) = currenttactic status in
184 [] -> warn ("Tacticals.solve_tactics: " ^ descr ^ " solved the goal!!!");
185 (* questo significa che non ci sono piu' goal, o che current_tactic non ne ha aperti di nuovi? (la 2a!) ##### *)
186 (* nel secondo caso basta per dire che solve_tactics has solved the goal? (si!) *)
188 | _ -> warn ("Tacticals.solve_tactics: try the next tactic");
189 solve_tactics ~tactics:(moretactics) status
192 warn ("Tacticals.solve_tactics: current tactic failed with exn: " ^ Printexc.to_string e);
193 solve_tactics ~tactics status
195 | [] -> raise (Fail "solve_tactics cannot solve the goal");
208 (** tattica di prova per debuggare i tatticali *)
210 let thens' ~start ~continuations status =
211 let (proof,new_goals) = start status in
214 (fun (proof,goals) goal tactic ->
215 let (proof',new_goals') = tactic (proof,goal) in
216 (proof',goals@new_goals')
217 ) (proof,[]) new_goals continuations
219 Invalid_argument _ -> raise (Fail "thens: wrong number of new goals")
222 let apply_T_tac status =
223 let (proof, goal) = status in
224 let curi,metasenv,pbo,pty = proof in
225 let metano,context,gty = CicUtil.lookup_meta goal metasenv in
230 | (Some (Cic.Name name,_))::_ when name = "T" -> n
231 | _::tl -> find (n+1) tl
233 prerr_endline ("eseguo find");
236 prerr_endline ("eseguo apply");
237 apply_tac ~term:(Cic.Rel rel) status
243 ~start:(intros_tac ~name:"pippo")
244 ~continuation:(thens' ~start:apply_T_tac ~continuations:[id_tac ; apply_tac ~term:(Cic.Rel 1)]))