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 print_status message status =
25 if print_status then pp_status status;
26 prerr_endline message;
32 match status#stack with
34 | ([], _, [], _) :: _ as stack ->
35 (* backward compatibility: do-nothing-dot *)
37 | (g, t, k, tag) :: s ->
38 match filter_open g, k with
40 (([ loc ], t, loc_tl @+ k, tag) :: s)
43 (([ loc ], t, k, tag) :: s)
44 | _ -> fail (lazy "can't use \".\" here")
46 status#set_stack gstatus
49 let branch_tac status =
51 match status#stack with
53 | (g, t, k, tag) :: s ->
54 match init_pos g with (* TODO *)
55 | [] | [ _ ] -> fail (lazy "too few goals to branch")
57 ([ loc ], [], [], `BranchTag) :: (loc_tl, t, k, tag) :: s
59 status#set_stack gstatus
62 let shift_tac status =
64 match status#stack with
65 | (g, t, k, `BranchTag) :: (g', t', k', tag) :: s ->
67 | [] -> fail (lazy "no more goals to shift")
69 (([ loc ], t @+ filter_open g @+ k, [],`BranchTag)
70 :: (loc_tl, t', k', tag) :: s))
71 | _ -> fail (lazy "can't shift goals here")
73 status#set_stack gstatus
76 let pos_tac i_s status =
78 match status#stack with
80 | ([ loc ], t, [],`BranchTag) :: (g', t', k', tag) :: s
82 let l_js = List.filter (fun (i, _) -> List.mem i i_s) ([loc] @+ g') in
83 ((l_js, t , [],`BranchTag)
84 :: (([ loc ] @+ g') @- l_js, t', k', tag) :: s)
85 | _ -> fail (lazy "can't use relative positioning here")
87 status#set_stack gstatus
90 let case_tac lab status =
92 match status#stack with
94 | ([ loc ], t, [],`BranchTag) :: (g', t', k', tag) :: s
99 let _,_,metasenv,_,_ = status#obj in
100 match NCicUtils.lookup_meta (goal_of_loc curloc) metasenv with
101 attrs,_,_ when List.mem (`Name lab) attrs -> true
102 | _ -> false) ([loc] @+ g') in
103 ((l_js, t , [],`BranchTag)
104 :: (([ loc ] @+ g') @- l_js, t', k', tag) :: s)
105 | _ -> fail (lazy "can't use relative positioning here")
107 status#set_stack gstatus
110 let wildcard_tac status =
112 match status#stack with
114 | ([ loc ] , t, [], `BranchTag) :: (g', t', k', tag) :: s
116 (([loc] @+ g', t, [], `BranchTag) :: ([], t', k', tag) :: s)
117 | _ -> fail (lazy "can't use wildcard here")
119 status#set_stack gstatus
122 let merge_tac status =
124 match status#stack with
126 | (g, t, k,`BranchTag) :: (g', t', k', tag) :: s ->
127 ((t @+ filter_open g @+ g' @+ k, t', k', tag) :: s)
128 | _ -> fail (lazy "can't merge goals here")
130 status#set_stack gstatus
133 let focus_tac gs status =
135 match status#stack with
137 | s -> assert(gs <> []);
139 let add_l acc _ _ l = if is_open l then l :: acc else acc in
140 fold ~env:add_l ~cont:add_l ~todo:add_l [] s
144 if not (List.exists (fun l -> goal_of_loc l = g) stack_locs) then
145 fail (lazy (sprintf "goal %d not found (or closed)" g)))
147 (zero_pos gs, [], [], `FocusTag) :: deep_close gs s
149 status#set_stack gstatus
152 let unfocus_tac status =
154 match status#stack with
156 | (g, [], [], `FocusTag) :: s when filter_open g = [] -> s
157 | _ as s -> fail (lazy ("can't unfocus, some goals are still open:\n"^
158 Continuationals.Stack.pp s))
160 status#set_stack gstatus
163 let skip_tac status =
165 match status#stack with
167 | (gl, t, k, tag) :: s ->
168 let gl = List.map switch_of_loc gl in
169 if List.exists (function Open _ -> true | Closed _ -> false) gl then
170 fail (lazy "cannot skip an open goal")
174 status#set_stack gstatus
177 let block_tac l status =
178 List.fold_left (fun status tac -> tac status) status l
182 let compare_statuses ~past ~present =
183 let _,_,past,_,_ = past#obj in
184 let _,_,present,_,_ = present#obj in
185 List.map fst (List.filter (fun (i,_) -> not(List.mem_assoc i past)) present),
186 List.map fst (List.filter (fun (i,_) -> not (List.mem_assoc i present)) past)
191 (* Exec and distribute_tac form a retraction pair:
192 1) exec (distribute_tac low_tac) (s,i) = low_tac (s,i)
193 2) tac [s]::G = G1::...::Gn::G' && G' is G with some goals closed =>
194 distribute_tac (exec tac) [s]::G = (G1@...Gn)::G'
195 3) tac G = distribute_tac (exec tac) G if
196 tac = distribute_tac lowtac
197 4) atomic_tac t === distribute_tac (exec t)
199 Note that executing an high tactic on a set of goals may be stronger
200 than executing the same tactic on those goals, but once at a time
201 (e.g. the tactic could perform a global analysis of the set of goals)
204 let exec tac (low_status : #lowtac_status) g =
205 let stack = [ [0,Open g], [], [], `NoTag ] in
207 (new NTacStatus.status low_status#obj stack)#set_estatus low_status
209 let status = tac status in
210 (low_status#set_estatus status)#set_obj status#obj
213 let distribute_tac tac (status : #tac_status) =
214 match status#stack with
216 | (g, t, k, tag) :: s ->
217 debug_print (lazy ("context length " ^string_of_int (List.length g)));
218 let rec aux s go gc =
221 debug_print (lazy "no selected goals");
224 debug_print (lazy "inner eval tactical");
226 if List.exists ((=) (goal_of_loc loc)) gc then
229 match switch_of_loc loc with
230 | Closed _ -> fail (lazy "cannot apply to a Closed goal")
233 let go', gc' = compare_statuses ~past:s ~present:sn in
234 sn, ((go @+ [n]) @- gc') @+ go', gc @+ gc'
238 let s0 = (new NTacStatus.status status#obj ())#set_estatus status in
239 let s0, go0, gc0 = s0, [], [] in
240 let sn, gon, gcn = aux s0 go0 gc0 g in
241 debug_print (lazy ("opened: "
242 ^ String.concat " " (List.map string_of_int gon)));
243 debug_print (lazy ("closed: "
244 ^ String.concat " " (List.map string_of_int gcn)));
246 (zero_pos gon, t @~- gcn, k @~- gcn, tag) :: deep_close gcn s
248 ((status#set_stack stack)#set_obj(sn:>lowtac_status)#obj)#set_estatus sn
251 let atomic_tac htac : #tac_status as 'a -> 'a = distribute_tac (exec htac) ;;
254 let rec repeat t (status : #tac_status as 'a) : 'a =
255 try repeat t (t status)
256 with NTacStatus.Error _ -> status
258 atomic_tac (repeat t) s
262 let try_tac tac status =
265 with NTacStatus.Error _ ->
269 let first_tac tacl status =
272 (fun tac _ -> try Some (tac status) with NTacStatus.Error _ -> None) tacl
275 | None -> fail (lazy "No tactics left")
279 let exact_tac t : 's tactic = distribute_tac (fun status goal ->
280 instantiate_with_ast status goal t)
283 let assumption_tac status = distribute_tac (fun status goal ->
284 let gty = get_goalty status goal in
285 let context = ctx_of gty in
288 (List.map (fun (name,_) -> exact_tac ("",0,(Ast.Ident (name,None))))
291 exec htac status goal) status
294 let find_in_context name context =
295 let rec aux acc = function
296 | [] -> raise Not_found
297 | (hd,_) :: tl when hd = name -> acc
298 | _ :: tl -> aux (acc + 1) tl
303 let clear_tac names =
304 if names = [] then id_tac
306 distribute_tac (fun status goal ->
307 let goalty = get_goalty status goal in
311 try find_in_context name (ctx_of goalty)
313 fail (lazy ("hypothesis '" ^ name ^ "' not found")))
316 let n,h,metasenv,subst,o = status#obj in
317 let metasenv,subst,_,_ = NCicMetaSubst.restrict metasenv subst goal js in
318 status#set_obj (n,h,metasenv,subst,o))
321 let generalize0_tac args =
322 if args = [] then id_tac
323 else exact_tac ("",0,Ast.Appl (Ast.Implicit `JustOne :: args))
326 let select0_tac ~where:(wanted,hyps,where) ~job =
327 let found, postprocess =
329 | `Substexpand argsno -> mk_in_scope, mk_out_scope argsno
330 | `Collect l -> (fun s t -> l := t::!l; mk_in_scope s t), mk_out_scope 1
331 | `ChangeWith f -> f,(fun s t -> s, t)
333 distribute_tac (fun status goal ->
334 let goalty = get_goalty status goal in
336 match where with None -> NCic.Implicit `Term | Some where -> where
338 let status, newgoalctx =
340 (fun (name,d as entry) (status,ctx) ->
342 let path = List.assoc name hyps in
346 select_term status ~found ~postprocess (mk_cic_term ctx ty)
348 let status,ty = term_of_cic_term status ty ctx in
349 status,(name,NCic.Decl ty)::ctx
350 | NCic.Def (bo,ty) ->
352 select_term status ~found ~postprocess (mk_cic_term ctx bo)
354 let status,bo = term_of_cic_term status bo ctx in
355 status,(name,NCic.Def (bo,ty))::ctx
357 Not_found -> status, entry::ctx
358 ) (ctx_of goalty) (status,[])
360 let status, newgoalty =
361 select_term status ~found ~postprocess goalty (wanted,path) in
362 (* WARNING: the next two lines simply change the context of newgoalty
363 from the old to the new one. Otherwise mk_meta will do that herself,
364 calling relocate that calls delift. However, newgoalty is now
365 ?[out_scope] and thus the delift would trigger the special unification
366 case, which is wrong now :-( *)
367 let status,newgoalty = term_of_cic_term status newgoalty (ctx_of goalty) in
368 let newgoalty = mk_cic_term newgoalctx newgoalty in
370 let status, instance =
371 mk_meta status newgoalctx (`Decl newgoalty) `IsTerm
373 instantiate status goal instance)
376 let select_tac ~where ~job move_down_hyps =
377 let (wanted,hyps,where) = GrafiteDisambiguate.disambiguate_npattern where in
379 match where with None -> NCic.Implicit `Term | Some where -> where in
380 if not move_down_hyps then
381 select0_tac ~where:(wanted,hyps,Some path) ~job
385 (fun path (name,path_name) -> NCic.Prod ("_",path_name,path))
389 generalize0_tac (List.map (fun (name,_) -> Ast.Ident (name,None)) hyps);
390 select0_tac ~where:(wanted,[],Some path) ~job;
391 clear_tac (List.map fst hyps) ]
394 let generalize_tac ~where =
397 select_tac ~where ~job:(`Collect l) true;
398 (fun s -> distribute_tac (fun status goal ->
399 let goalty = get_goalty status goal in
400 let status,canon,rest =
404 _,_,(None,_,_) -> fail (lazy "No term to generalize")
405 | txt,txtlen,(Some what,_,_) ->
407 disambiguate status (ctx_of goalty) (txt,txtlen,what) None
411 | he::tl -> status,he,tl in
414 (fun s t -> unify s (ctx_of goalty) canon t) status rest in
415 let status, canon = term_of_cic_term status canon (ctx_of goalty) in
416 instantiate status goal
417 (mk_cic_term (ctx_of goalty) (NCic.Appl [NCic.Implicit `Term ; canon ]))
423 exact_tac ("",0, Ast.Appl [Ast.Implicit `JustOne; Ast.Implicit `JustOne]);
425 pos_tac [3]; exact_tac t;
426 shift_tac; pos_tac [2]; skip_tac;
430 let lapply_tac (s,n,t) =
431 exact_tac (s,n, Ast.Appl [Ast.Implicit `JustOne; t])
434 let reduce_tac ~reduction ~where =
435 let change status t =
437 | `Normalize perform_delta ->
439 ?delta:(if perform_delta then None else Some max_int) (ctx_of t) t
440 | `Whd perform_delta ->
442 ?delta:(if perform_delta then None else Some max_int) (ctx_of t) t
444 let where = GrafiteDisambiguate.disambiguate_npattern where in
445 select0_tac ~where ~job:(`ChangeWith change)
448 let change_tac ~where ~with_what =
449 let change status t =
450 let status, ww = disambiguate status (ctx_of t) with_what None in
451 let status = unify status (ctx_of t) t ww in
454 let where = GrafiteDisambiguate.disambiguate_npattern where in
455 select0_tac ~where ~job:(`ChangeWith change)
458 let letin_tac ~where ~what:(_,_,w) name =
460 select_tac ~where ~job:(`Substexpand 1) true;
462 ("",0,Ast.LetIn((Ast.Ident (name,None),None),w,Ast.Implicit `JustOne));
466 let apply_tac (s,n,t) =
467 let t = Ast.Appl [t; Ast.Implicit `Vector] in
475 lefts: NCic.term list;
476 rights: NCic.term list;
477 reference: NReference.reference;
481 let ref_of_indtyinfo iti = iti.reference;;
483 let analyze_indty_tac ~what indtyref =
484 distribute_tac (fun status goal ->
485 let goalty = get_goalty status goal in
486 let status, what = disambiguate status (ctx_of goalty) what None in
487 let status, ty_what = typeof status (ctx_of what) what in
488 let status, (r,consno,lefts,rights) = analyse_indty status ty_what in
489 let leftno = List.length lefts in
490 let rightno = List.length rights in
492 rightno = rightno; leftno = leftno; consno = consno;
493 lefts = lefts; rights = rights; reference = r;
495 exec id_tac status goal)
498 let sort_of_goal_tac sortref = distribute_tac (fun status goal ->
499 let goalty = get_goalty status goal in
500 let status,sort = typeof status (ctx_of goalty) goalty in
501 let status, sort = fix_sorts status sort in
502 let status, sort = term_of_cic_term status sort (ctx_of goalty) in
507 let elim_tac ~what:(txt,len,what) ~where =
508 let what = txt, len, Ast.Appl [what; Ast.Implicit `Vector] in
509 let indtyinfo = ref None in
510 let sort = ref (NCic.Rel 1) in
511 atomic_tac (block_tac [
512 analyze_indty_tac ~what indtyinfo;
514 ~where ~job:(`Substexpand ((HExtlib.unopt !indtyinfo).rightno+1)) true s);
515 sort_of_goal_tac sort;
517 let ity = HExtlib.unopt !indtyinfo in
518 let NReference.Ref (uri, _) = ity.reference in
520 NUri.name_of_uri uri ^ "_" ^
521 snd (NCicElim.ast_of_sort
522 (match !sort with NCic.Sort x -> x | _ -> assert false))
526 Ast.Appl [ Ast.Ident (name,None) ; Ast.Implicit `Vector ; w ]
528 exact_tac ("",0,eliminator) status) ])
531 let rewrite_tac ~dir ~what:(_,_,what) ~where status =
532 let sortref = ref (NCic.Rel 1) in
533 let status = sort_of_goal_tac sortref status in
534 let suffix = "_" ^ snd (NCicElim.ast_of_sort
535 (match !sortref with NCic.Sort x -> x | _ -> assert false))
539 `LeftToRight -> "eq" ^ suffix ^ "_r"
540 | `RightToLeft -> "eq" ^ suffix
543 [ select_tac ~where ~job:(`Substexpand 1) true;
546 Ast.Appl(Ast.Ident(name,None)::HExtlib.mk_list (Ast.Implicit `JustOne) 5@
553 ("",0,(Ast.Binder (`Lambda,
554 (Ast.Ident (name,None),None),Ast.Implicit `JustOne)));
555 if name = "_" then clear_tac [name] else id_tac ]
558 let cases ~what status goal =
559 let gty = get_goalty status goal in
560 let status, what = disambiguate status (ctx_of gty) what None in
561 let status, ty = typeof status (ctx_of what) what in
562 let status, (ref, consno, _, _) = analyse_indty status ty in
563 let status, what = term_of_cic_term status what (ctx_of gty) in
565 NCic.Match (ref,NCic.Implicit `Term, what,
566 HExtlib.mk_list (NCic.Implicit `Term) consno)
568 instantiate status goal (mk_cic_term (ctx_of gty) t)
571 let cases_tac ~what:(txt,len,what) ~where =
572 let what = txt, len, Ast.Appl [what; Ast.Implicit `Vector] in
573 let indtyinfo = ref None in
576 analyze_indty_tac ~what indtyinfo;
578 ~where ~job:(`Substexpand ((HExtlib.unopt !indtyinfo).rightno+1))true s);
579 distribute_tac (cases ~what) ])
583 let name = if name = "_" then "_clearme" else name in
584 block_tac [ intro_tac name;
586 ~where:("",0,(None,[],None))
587 ~what:("",0,Ast.Ident (name,None));
588 if name = "_clearme" then clear_tac ["_clearme"] else id_tac ]
591 let constructor_tac ?(num=1) ~args = distribute_tac (fun status goal ->
592 if num < 1 then fail (lazy "constructor numbers begin with 1");
593 let gty = get_goalty status goal in
594 let status, (r,_,_,_) = analyse_indty status gty in
595 let ref = NReference.mk_constructor num r in
597 if args = [] then Ast.NRef ref else
598 Ast.Appl (HExtlib.list_concat ~sep:[Ast.Implicit `Vector]
599 ([Ast.NRef ref] :: List.map (fun _,_,x -> [x]) args))
601 exec (apply_tac ("",0,t)) status goal)
604 let assert0_tac (hyps,concl) = distribute_tac (fun status goal ->
605 let gty = get_goalty status goal in
606 let eq status ctx t1 t2 =
607 let status,t1 = disambiguate status ctx t1 None in
608 let status,t1 = apply_subst status ctx t1 in
609 let status,t1 = term_of_cic_term status t1 ctx in
610 let t2 = mk_cic_term ctx t2 in
611 let status,t2 = apply_subst status ctx t2 in
612 let status,t2 = term_of_cic_term status t2 ctx in
613 prerr_endline ("COMPARING: " ^ NCicPp.ppterm ~subst:[] ~metasenv:[] ~context:ctx t1 ^ " vs " ^ NCicPp.ppterm ~subst:[] ~metasenv:[] ~context:ctx t2);
617 let status,gty' = term_of_cic_term status gty (ctx_of gty) in
618 let status = eq status (ctx_of gty) concl gty' in
621 (fun (id1,e1) ((id2,e2) as item) (status,ctx) ->
622 assert (id1=id2 || (prerr_endline (id1 ^ " vs " ^ id2); false));
624 `Decl t1, NCic.Decl t2 ->
625 let status = eq status ctx t1 t2 in
627 | `Def (b1,t1), NCic.Def (b2,t2) ->
628 let status = eq status ctx t1 t2 in
629 let status = eq status ctx b1 b2 in
632 ) hyps (ctx_of gty) (status,[])
634 exec id_tac status goal)
637 let assert_tac seqs status =
638 match status#stack with
641 assert (List.length g = List.length seqs);
644 | [seq] -> assert0_tac seq
648 HExtlib.list_concat ~sep:[shift_tac]
649 (List.map (fun seq -> [assert0_tac seq]) seqs)@