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.
12 * HELM is distributed in the hope that it will be useful,
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? *)
34 let debug_print = fun _ -> ()
36 (** debugging print *)
39 debug_print ("TACTICALS WARNING: " ^ s)
44 (* not a tactical, but it's used only here (?) *)
47 let tac (proof,goal) = (proof,[goal])
52 naive implementation of ORELSE tactical, try a sequence of tactics in turn:
53 if one fails pass to the next one and so on, eventually raises (failure "no
55 TODO warning: not tail recursive due to "try .. with" boxing
57 Galla: is this exactly Coq's "First"?
60 let try_tactics ~tactics =
61 let rec try_tactics ~(tactics: (string * tactic) list) status =
62 warn "in Tacticals.try_tactics";
64 | (descr, tac)::tactics ->
65 warn ("Tacticals.try_tactics IS TRYING " ^ descr);
67 let res = apply_tactic tac status in
68 warn ("Tacticals.try_tactics: " ^ descr ^ " succedeed!!!");
74 | (CicTypeChecker.TypeCheckerFailure _)
75 | (CicUnification.UnificationFailure _) ->
77 "Tacticals.try_tactics failed with exn: " ^
78 Printexc.to_string e);
79 try_tactics ~tactics status
80 | _ -> raise e (* [e] must not be caught ; let's re-raise it *)
82 | [] -> raise (Fail "try_tactics: no tactics left")
84 mk_tactic (try_tactics ~tactics)
87 let thens ~start ~continuations =
88 let thens ~start ~continuations status =
89 let (proof,new_goals) = apply_tactic start status in
92 (fun (proof,goals) goal tactic ->
93 let (proof',new_goals') = apply_tactic tactic (proof,goal) in
94 (proof',goals@new_goals')
95 ) (proof,[]) new_goals continuations
97 Invalid_argument _ -> raise (Fail "thens: wrong number of new goals")
99 mk_tactic (thens ~start ~continuations )
102 let then_ ~start ~continuation =
103 let then_ ~start ~continuation status =
104 let (proof,new_goals) = apply_tactic start status in
106 (fun (proof,goals) goal ->
107 let (proof',new_goals') = apply_tactic continuation (proof,goal) in
108 (proof',goals@new_goals')
109 ) (proof,[]) new_goals
111 mk_tactic (then_ ~start ~continuation)
113 let rec seq ~tactics =
117 | hd :: tl -> then_ ~start:hd ~continuation:(seq ~tactics:tl)
119 (* TODO: x debug: i due tatticali seguenti non contano quante volte hanno applicato la tattica *)
121 (* This keep on appling tactic until it fails *)
122 (* When <tactic> generates more than one goal, you have a tree of
123 application on the tactic, repeat_tactic works in depth on this tree *)
125 let repeat_tactic ~tactic =
126 let rec repeat_tactic ~tactic status =
127 warn "in repeat_tactic";
128 try let (proof, goallist) = apply_tactic tactic status in
129 let rec step proof goallist =
133 let (proof', goallist') = repeat_tactic ~tactic (proof, head) in
134 let (proof'', goallist'') = step proof' tail in
135 proof'', goallist'@goallist''
140 warn ("Tacticals.repeat_tactic failed after nth time with exception: " ^ Printexc.to_string e) ;
141 apply_tactic id_tac status
143 mk_tactic (repeat_tactic ~tactic)
148 (* This tries to apply tactic n times *)
149 let do_tactic ~n ~tactic =
150 let rec do_tactic ~n ~tactic status =
153 let (proof, goallist) =
154 if (n>0) then apply_tactic tactic status
155 else apply_tactic id_tac status in
156 (* else (proof, []) in *)
157 (* perche' non va bene questo? stessa questione di ##### ? *)
158 let rec step proof goallist =
162 let (proof', goallist') =
163 do_tactic ~n:(n-1) ~tactic (proof, head) in
164 let (proof'', goallist'') = step proof' tail in
165 proof'', goallist'@goallist''
170 warn ("Tacticals.do_tactic failed after nth time with exception: " ^ Printexc.to_string e) ;
171 apply_tactic id_tac status
173 mk_tactic (do_tactic ~n ~tactic)
178 (* This applies tactic and catches its possible failure *)
179 let try_tactic ~tactic =
180 let rec try_tactic ~tactic status =
181 warn "in Tacticals.try_tactic";
183 apply_tactic tactic status
186 warn ( "Tacticals.try_tactic failed with exn: " ^ Printexc.to_string e);
187 apply_tactic id_tac status
189 mk_tactic (try_tactic ~tactic)
192 let fail = mk_tactic (fun _ -> raise (Fail "fail tactical"))
194 (* This tries tactics until one of them doesn't _solve_ the goal *)
195 (* TODO: si puo' unificare le 2(due) chiamate ricorsive? *)
196 let solve_tactics ~tactics =
197 let rec solve_tactics ~(tactics: (string * tactic) list) status =
198 warn "in Tacticals.solve_tactics";
200 | (descr, currenttactic)::moretactics ->
201 warn ("Tacticals.solve_tactics is trying " ^ descr);
203 let (proof, goallist) = apply_tactic currenttactic status in
205 [] -> warn ("Tacticals.solve_tactics: " ^ descr ^
206 " solved the goal!!!");
207 (* questo significa che non ci sono piu' goal, o che current_tactic non ne
208 ha aperti di nuovi? (la 2a!) #####
209 nel secondo caso basta per dire che solve_tactics has solved the goal? (si!) *)
211 | _ -> warn ("Tacticals.solve_tactics: try the next tactic");
212 solve_tactics ~tactics:(moretactics) status
215 warn ("Tacticals.solve_tactics: current tactic failed with exn: " ^
216 Printexc.to_string e);
217 solve_tactics ~tactics status
219 | [] -> raise (Fail "solve_tactics cannot solve the goal");
220 apply_tactic id_tac status
222 mk_tactic (solve_tactics ~tactics)
234 (** tattica di prova per debuggare i tatticali *)
236 let thens' ~start ~continuations status =
237 let (proof,new_goals) = start status in
240 (fun (proof,goals) goal tactic ->
241 let (proof',new_goals') = tactic (proof,goal) in
242 (proof',goals@new_goals')
243 ) (proof,[]) new_goals continuations
245 Invalid_argument _ -> raise (Fail "thens: wrong number of new goals")
248 let apply_T_tac status =
249 let (proof, goal) = status in
250 let curi,metasenv,pbo,pty = proof in
251 let metano,context,gty = CicUtil.lookup_meta goal metasenv in
256 | (Some (Cic.Name name,_))::_ when name = "T" -> n
257 | _::tl -> find (n+1) tl
259 debug_print ("eseguo find");
262 debug_print ("eseguo apply");
263 apply_tac ~term:(Cic.Rel rel) status
269 ~start:(intros_tac ~name:"pippo")
270 ~continuation:(thens' ~start:apply_T_tac ~continuations:[id_tac ; apply_tac ~term:(Cic.Rel 1)]))