2 ||M|| This file is part of HELM, an Hypertextual, Electronic
3 ||A|| Library of Mathematics, developed at the Computer Science
4 ||T|| Department, University of Bologna, Italy.
6 ||T|| HELM is free software; you can redistribute it and/or
7 ||A|| modify it under the terms of the GNU General Public License
8 \ / version 2 or (at your option) any later version.
9 \ / This software is distributed as is, NO WARRANTY.
10 V_______________________________________________________________ *)
12 (* $Id: nCic.ml 9058 2008-10-13 17:42:30Z tassi $ *)
17 let debug_print s = if debug then prerr_endline (Lazy.force s) else ()
19 open Continuationals.Stack
21 module Ast = CicNotationPt
23 let id_tac status = status ;;
24 let print_tac message status = prerr_endline message; status ;;
28 match status.gstatus with
30 | ([], _, [], _) :: _ as stack ->
31 (* backward compatibility: do-nothing-dot *)
33 | (g, t, k, tag) :: s ->
34 match filter_open g, k with
36 (([ loc ], t, loc_tl @+ k, tag) :: s)
39 (([ loc ], t, k, tag) :: s)
40 | _ -> fail (lazy "can't use \".\" here")
42 { status with gstatus = new_gstatus }
45 let branch_tac status =
47 match status.gstatus with
49 | (g, t, k, tag) :: s ->
50 match init_pos g with (* TODO *)
51 | [] | [ _ ] -> fail (lazy "too few goals to branch");
53 ([ loc ], [], [], `BranchTag) :: (loc_tl, t, k, tag) :: s
55 { status with gstatus = new_gstatus }
58 let shift_tac status =
60 match status.gstatus with
61 | (g, t, k, `BranchTag) :: (g', t', k', tag) :: s ->
63 | [] -> fail (lazy "no more goals to shift")
65 (([ loc ], t @+ filter_open g @+ k, [],`BranchTag)
66 :: (loc_tl, t', k', tag) :: s))
67 | _ -> fail (lazy "can't shift goals here")
69 { status with gstatus = new_gstatus }
72 let pos_tac i_s status =
74 match status.gstatus with
76 | ([ loc ], t, [],`BranchTag) :: (g', t', k', tag) :: s
78 let l_js = List.filter (fun (i, _) -> List.mem i i_s) ([loc] @+ g') in
79 ((l_js, t , [],`BranchTag)
80 :: (([ loc ] @+ g') @- l_js, t', k', tag) :: s)
81 | _ -> fail (lazy "can't use relative positioning here")
83 { status with gstatus = new_gstatus }
86 let wildcard_tac status =
88 match status.gstatus with
90 | ([ loc ] , t, [], `BranchTag) :: (g', t', k', tag) :: s
92 (([loc] @+ g', t, [], `BranchTag) :: ([], t', k', tag) :: s)
93 | _ -> fail (lazy "can't use wildcard here")
95 { status with gstatus = new_gstatus }
98 let merge_tac status =
100 match status.gstatus with
102 | (g, t, k,`BranchTag) :: (g', t', k', tag) :: s ->
103 ((t @+ filter_open g @+ g' @+ k, t', k', tag) :: s)
104 | _ -> fail (lazy "can't merge goals here")
106 { status with gstatus = new_gstatus }
109 let focus_tac gs status =
111 match status.gstatus with
113 | s -> assert(gs <> []);
115 let add_l acc _ _ l = if is_open l then l :: acc else acc in
116 fold ~env:add_l ~cont:add_l ~todo:add_l [] s
120 if not (List.exists (fun l -> goal_of_loc l = g) stack_locs) then
121 fail (lazy (sprintf "goal %d not found (or closed)" g)))
123 (zero_pos gs, [], [], `FocusTag) :: deep_close gs s
125 { status with gstatus = new_gstatus }
128 let unfocus_tac status =
130 match status.gstatus with
132 | ([], [], [], `FocusTag) :: s -> s
133 | _ -> fail (lazy "can't unfocus, some goals are still open")
135 { status with gstatus = new_gstatus }
138 let skip_tac status =
140 match status.gstatus with
142 | (gl, t, k, tag) :: s ->
143 let gl = List.map switch_of_loc gl in
144 if List.exists (function Open _ -> true | Closed _ -> false) gl then
145 fail (lazy "cannot skip an open goal")
149 { status with gstatus = new_gstatus }
152 let block_tac l status =
153 List.fold_left (fun status tac -> tac status) status l
156 let compare_statuses ~past ~present =
157 let _,_,past,_,_ = past.pstatus in
158 let _,_,present,_,_ = present.pstatus in
160 List.map fst (List.filter (fun (i,_) -> not (List.mem_assoc i present)) past)
163 List.map fst (List.filter (fun (i,_) -> not(List.mem_assoc i past)) present)
170 (* Exec and distribute_tac form a retraction pair:
171 1) exec (distribute_tac low_tac) (s,i) = low_tac (s,i)
172 2) tac [s]::G = G1::...::Gn::G' && G' is G with some goals closed =>
173 distribute_tac (exec tac) [s]::G = (G1@...Gn)::G'
174 3) tac G = distribute_tac (exec tac) G if
175 tac = distribute_tac lowtac
176 4) atomic_tac t === distribute_tac (exec t)
178 Note that executing an high tactic on a set of goals may be stronger
179 than executing the same tactic on those goals, but once at a time
180 (e.g. the tactic could perform a global analysis of the set of goals)
183 let exec tac low_status g =
184 let stack = [ [0,Open g], [], [], `NoTag ] in
185 let status = tac { gstatus = stack ; istatus = low_status } in
189 let distribute_tac tac status =
190 match status.gstatus with
192 | (g, t, k, tag) :: s ->
193 debug_print (lazy ("context length " ^string_of_int (List.length g)));
194 let rec aux s go gc =
197 debug_print (lazy "no selected goals");
200 debug_print (lazy "inner eval tactical");
202 if List.exists ((=) (goal_of_loc loc)) gc then
205 match switch_of_loc loc with
206 | Closed _ -> fail (lazy "cannot apply to a Closed goal")
209 let go', gc' = compare_statuses ~past:s ~present:sn in
210 sn, ((go @+ [n]) @- gc') @+ go', gc @+ gc'
214 let s0, go0, gc0 = status.istatus, [], [] in
215 let sn, gon, gcn = aux s0 go0 gc0 g in
216 debug_print (lazy ("opened: "
217 ^ String.concat " " (List.map string_of_int gon)));
218 debug_print (lazy ("closed: "
219 ^ String.concat " " (List.map string_of_int gcn)));
221 (zero_pos gon, t @~- gcn, k @~- gcn, tag) :: deep_close gcn s
223 { gstatus = stack; istatus = sn }
226 let atomic_tac htac = distribute_tac (exec htac) ;;
228 let exact_tac t = distribute_tac (fun status goal ->
229 let goalty = get_goalty status goal in
230 let status, t = disambiguate status t (Some goalty) (ctx_of goalty) in
231 instantiate status goal t)
234 let find_in_context name context =
235 let rec aux acc = function
236 | [] -> raise Not_found
237 | (hd,_) :: tl when hd = name -> acc
238 | _ :: tl -> aux (acc + 1) tl
243 let clear_tac names =
244 if names = [] then id_tac
246 distribute_tac (fun status goal ->
247 let goalty = get_goalty status goal in
251 try find_in_context name (ctx_of goalty)
253 fail (lazy ("hypothesis '" ^ name ^ "' not found")))
256 let n,h,metasenv,subst,o = status.pstatus in
257 let metasenv,subst,_ = NCicMetaSubst.restrict metasenv subst goal js in
258 { status with pstatus = n,h,metasenv,subst,o })
261 let force f s = Lazy.force f s;;
263 let generalize0_tac args =
264 if args = [] then id_tac
265 else exact_tac ("",0,Ast.Appl (Ast.Implicit :: args))
268 let select0_tac ~where:(wanted,_,where) ~job =
269 let found, postprocess =
271 | `Substexpand argsno -> mk_in_scope, mk_out_scope argsno
272 | `Collect l -> (fun s t -> l := t::!l; mk_in_scope s t), mk_out_scope 1
274 distribute_tac (fun status goal ->
275 let goalty = get_goalty status goal in
277 match where with None -> NCic.Implicit `Term | Some where -> where
279 let status, newgoalty =
280 select_term status ~found ~postprocess goalty (wanted,path)
282 let status, instance =
283 mk_meta status (ctx_of newgoalty) (`Decl newgoalty)
285 instantiate status goal instance)
288 let select_tac ~where ~job move_down_hyps =
289 let (wanted,hyps,where) = GrafiteDisambiguate.disambiguate_npattern where in
291 match where with None -> NCic.Implicit `Term | Some where -> where in
292 if not move_down_hyps then
293 select0_tac ~where:(wanted,hyps,Some path) ~job
297 (fun path (name,path_name) -> NCic.Prod ("_",path_name,path))
301 generalize0_tac (List.map (fun (name,_) -> Ast.Ident (name,None)) hyps);
302 select0_tac ~where:(wanted,[],Some path) ~job;
303 clear_tac (List.map fst hyps) ]
306 let generalize_tac ~where =
309 select_tac ~where ~job:(`Collect l) true;
310 force (lazy (distribute_tac (fun status goal ->
311 let goalty = get_goalty status goal in
312 (* unift (ctx_of goal) t s *)
313 instantiate status goal
314 (mk_cic_term (ctx_of goalty) (NCic.Appl [NCic.Implicit `Term ;
315 term_of_cic_term (List.hd !l) (ctx_of goalty) ]))
321 let n,h,metasenv,subst,o = status.pstatus in
324 (function (_,(Some tag,_,_,_)) ->
325 tag <> NCicMetaSubst.in_scope_tag &&
326 not (NCicMetaSubst.is_out_scope_tag tag)
332 (function (_,(Some tag,_,_,_)) ->
333 tag = NCicMetaSubst.in_scope_tag | _ -> assert false)
336 let metasenv = List.map (fun (i,(_,c,_,t)) -> i,(None,c,t)) in_m @ metasenv in
337 let in_m = List.map fst in_m in
338 let out_m = match out_m with [i] -> i | _ -> assert false in
339 { status with pstatus = n,h,metasenv,subst,o }, in_m, out_m
342 let change ~where ~with_what status goal =
344 let goalty = get_goalty status goal in
345 let (wanted,_,where) = GrafiteDisambiguate.disambiguate_npattern where in
347 match where with None -> NCic.Implicit `Term | Some where -> where
349 let status, newgoalty = assert false (*
350 select_term status 1 goalty (wanted,path)*) in
351 let status, in_scope, out_scope = reopen status in
352 let status = List.fold_left (exact with_what) status in_scope in
354 let j,(n,cctx,bo,_) = out_scope in
355 let _ = typeof status (ctx_of goalty) (Obj.magic (n,cctx,bo)) in
357 let n,h,metasenv,subst,o = status.pstatus in
358 let subst = out_scope :: subst in
359 let status = { status with pstatus = n,h,metasenv,subst,o } in
361 let status, instance =
362 mk_meta status (ctx_of newgoalty) (`Decl newgoalty)
364 instantiate status goal instance
367 let change_tac ~where ~with_what = distribute_tac (change ~where ~with_what) ;;
369 let apply_tac = exact_tac;;
375 lefts: NCic.term list;
376 rights: NCic.term list;
377 reference: NReference.reference;
381 let analyze_indty_tac ~what indtyref = distribute_tac (fun status goal ->
382 let goalty = get_goalty status goal in
383 let status, what = disambiguate status what None (ctx_of goalty) in
384 let ty_what = typeof status (ctx_of what) what in
385 let r,consno,lefts,rights = analyse_indty status ty_what in
386 let leftno = List.length rights in
387 let rightno = List.length rights in
389 rightno = rightno; leftno = leftno; consno = consno;
390 lefts = lefts; rights = rights; reference = r;
392 exec id_tac status goal)
395 let elim_tac ~what ~where =
396 let indtyinfo = ref None in
397 let sort = ref None in
398 let compute_goal_sort_tac = distribute_tac (fun status goal ->
399 let goalty = get_goalty status goal in
400 let goalsort = typeof status (ctx_of goalty) goalty in
401 sort := Some goalsort;
402 exec id_tac status goal)
404 atomic_tac (block_tac [
405 analyze_indty_tac ~what indtyinfo;
406 force (lazy (select_tac
407 ~where ~job:(`Substexpand ((HExtlib.unopt !indtyinfo).rightno+1)) true));
408 compute_goal_sort_tac;
410 let sort = HExtlib.unopt !sort in
411 let ity = HExtlib.unopt !indtyinfo in
412 let NReference.Ref (uri, _) = ity.reference in
413 let name = NUri.name_of_uri uri ^
414 match term_of_cic_term sort (ctx_of sort) with
415 | NCic.Sort NCic.Prop -> "_ind"
416 | NCic.Sort _ -> "_rect"
420 HExtlib.mk_list Ast.Implicit (ity.leftno+1+ ity.consno + ity.rightno) in
423 Ast.Appl(Ast.Ident(name,None)::holes @ [ w ])
425 exact_tac ("",0,eliminator))) ])
428 let rewrite_tac ~dir ~what:(_,_,what) ~where =
430 match dir with `LeftToRight -> "eq_elim_r" | `RightToLeft -> "eq_ind"
433 [ select_tac ~where ~job:(`Substexpand 1) true;
436 Ast.Appl(Ast.Ident(name,None)::HExtlib.mk_list Ast.Implicit 5 @
443 ("",0,(Ast.Binder (`Lambda,
444 (Ast.Ident (name,None),None),Ast.Implicit)));
445 if name = "_" then clear_tac [name] else id_tac ]
448 let cases ~what status goal =
449 let gty = get_goalty status goal in
450 let status, what = disambiguate status what None (ctx_of gty) in
451 let ty = typeof status (ctx_of what) what in
452 let ref, consno, _, _ = analyse_indty status ty in
454 NCic.Match (ref,NCic.Implicit `Term, term_of_cic_term what (ctx_of gty),
455 HExtlib.mk_list (NCic.Implicit `Term) consno)
457 let ctx = ctx_of gty in
458 let status,t,ty = refine status ctx (mk_cic_term ctx t) (Some gty) in
459 instantiate status goal t
462 let cases_tac ~what ~where =
463 let indtyinfo = ref None in
466 analyze_indty_tac ~what indtyinfo;
467 force (lazy (select_tac
468 ~where ~job:(`Substexpand ((HExtlib.unopt !indtyinfo).rightno+1))true));
469 distribute_tac (cases ~what) ])
473 let name = if name = "_" then "_clearme" else name in
474 block_tac [ intro_tac name;
476 ~where:("",0,(None,[],None))
477 ~what:("",0,Ast.Ident (name,None));
478 if name = "_clearme" then clear_tac ["_clearme"] else id_tac ]