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 $ *)
14 let debug = ref false;;
16 if !debug then prerr_endline (Lazy.force x) else ()
19 type automation_cache = NDiscriminationTree.DiscriminationTree.t
20 type unit_eq_cache = NCicParamod.state
22 exception Error of string lazy_t * exn option
23 let fail ?exn msg = raise (Error (msg,exn))
25 module NRef = NReference
30 | MultiPassDisambiguator.DisambiguationError _
31 | NCicRefiner.RefineFailure _
32 | NCicRefiner.Uncertain _
33 | NCicUnification.UnificationFailure _
34 | NCicUnification.Uncertain _
35 | NCicTypeChecker.TypeCheckerFailure _
36 | NCicMetaSubst.MetaSubstFailure _
37 | NCicMetaSubst.Uncertain _ as exn -> fail ~exn (lazy fname)
40 class type g_eq_status =
42 method eq_cache : unit_eq_cache
47 val eq_cache = NCicParamod.empty_state
48 method eq_cache = eq_cache
49 method set_eq_cache v = {< eq_cache = v >}
51 : 'status. #g_eq_status as 'status -> 'self
52 = fun o -> self#set_eq_cache o#eq_cache
55 class type g_auto_status =
57 method auto_cache : automation_cache
62 val auto_cache = NDiscriminationTree.DiscriminationTree.empty
63 method auto_cache = auto_cache
64 method set_auto_cache v = {< auto_cache = v >}
65 method set_auto_status
66 : 'status. #g_auto_status as 'status -> 'self
67 = fun o -> self#set_auto_cache o#auto_cache
70 class type g_pstatus =
72 inherit GrafiteDisambiguate.g_status
78 class virtual pstatus =
81 inherit GrafiteDisambiguate.status
86 method set_obj o = {< obj = o >}
87 method set_pstatus : 'status. #g_pstatus as 'status -> 'self
89 (((self#set_disambiguate_status o)#set_obj o#obj)#set_auto_status o)#set_eq_status o
92 type tactic_term = NotationPt.term Disambiguate.disambiguator_input
93 type tactic_pattern = GrafiteAst.npattern Disambiguate.disambiguator_input
95 type cic_term = NCic.context * NCic.term
96 let ctx_of (c,_) = c ;;
97 let mk_cic_term c t = c,t ;;
99 let ppterm (status:#pstatus) t =
100 let uri,height,metasenv,subst,obj = status#obj in
102 status#ppterm ~metasenv ~subst ~context t
105 let ppcontext (status: #pstatus) c =
106 let uri,height,metasenv,subst,obj = status#obj in
107 status#ppcontext ~metasenv ~subst c
110 let ppterm_and_context (status: #pstatus) t =
111 let uri,height,metasenv,subst,obj = status#obj in
113 status#ppcontext ~metasenv ~subst context ^ "\n ⊢ "^
114 status#ppterm ~metasenv ~subst ~context t
117 let relocate status destination (source,t as orig) =
118 pp(lazy("relocate:\n" ^ ppterm_and_context status orig));
119 pp(lazy("relocate in:\n" ^ ppcontext status destination));
121 if source == destination then status, orig else
122 let _, _, metasenv, subst, _ = status#obj in
123 let rec compute_ops ctx = function (* destination, source *)
124 | (n1, NCic.Decl t1 as e)::cl1 as ex, (n2, NCic.Decl t2)::cl2 ->
126 NCicReduction.are_convertible status ctx ~subst ~metasenv t1 t2 then
127 compute_ops (e::ctx) (cl1,cl2)
129 [ `Delift ctx; `Lift (List.rev ex) ]
130 | (n1, NCic.Def (b1,t1) as e)::cl1 as ex, (n2, NCic.Def (b2,t2))::cl2 ->
132 NCicReduction.are_convertible status ctx ~subst ~metasenv t1 t2 &&
133 NCicReduction.are_convertible status ctx ~subst ~metasenv b1 b2 then
134 compute_ops (e::ctx) (cl1,cl2)
136 [ `Delift ctx; `Lift (List.rev ex) ]
137 | (n1, NCic.Def (b1,t1) as e)::cl1 as ex, (n2, NCic.Decl t2)::cl2 ->
139 NCicReduction.are_convertible status ctx ~subst ~metasenv t1 t2 then
140 compute_ops (e::ctx) (cl1,cl2)
142 [ `Delift ctx; `Lift (List.rev ex) ]
143 | (n1, NCic.Decl _)::cl1 as ex, (n2, NCic.Def _)::cl2 ->
144 [ `Delift ctx; `Lift (List.rev ex) ]
145 | _::_ as ex, [] -> [ `Lift (List.rev ex) ]
146 | [], _::_ -> [ `Delift ctx ]
149 let ops = compute_ops [] (List.rev destination, List.rev source) in
150 let rec mk_irl i j = if i > j then [] else NCic.Rel i :: mk_irl (i+1) j in
152 (fun (status, (source,t)) -> function
154 let len = List.length extra_ctx in
155 status, (extra_ctx@source, NCicSubstitution.lift status len t)
157 let len_ctx = List.length ctx in
158 let irl = mk_irl 1 (List.length ctx) in
159 let lc = List.length source - len_ctx, NCic.Ctx irl in
160 let u, d, metasenv, subst, o = status#obj in
161 pp(lazy("delifting as " ^
162 status#ppterm ~metasenv ~subst ~context:source
163 (NCic.Meta (-1,lc))));
164 let (metasenv, subst), t =
165 NCicMetaSubst.delift status
166 ~unify:(fun m s c t1 t2 ->
167 try Some (NCicUnification.unify status m s c t1 t2)
169 | NCicUnification.UnificationFailure _
170 | NCicUnification.Uncertain _ -> None)
171 metasenv subst source (-1) lc t
173 let status = status#set_obj (u, d, metasenv, subst, o) in
177 pp(lazy("relocated: " ^ ppterm (fst rc) (snd rc)));
180 let relocate a b c = wrap "relocate" (relocate a b) c;;
182 let term_of_cic_term s t c =
183 let s, (_,t) = relocate s c t in
187 let disambiguate status context t ty =
190 | None -> status, None
192 let status, (_,x) = relocate status context ty in status, Some x
194 let uri,height,metasenv,subst,obj = status#obj in
195 let metasenv, subst, status, t =
196 GrafiteDisambiguate.disambiguate_nterm status expty context metasenv subst t
198 let new_pstatus = uri,height,metasenv,subst,obj in
199 status#set_obj new_pstatus, (context, t)
201 let disambiguate a b c d = wrap "disambiguate" (disambiguate a b c) d;;
203 let typeof status ctx t =
204 let status, (_,t) = relocate status ctx t in
205 let _,_,metasenv,subst,_ = status#obj in
206 let ty = NCicTypeChecker.typeof status ~subst ~metasenv ctx t in
209 let typeof a b c = wrap "typeof" (typeof a b) c;;
211 let saturate status ?delta (ctx,t) =
212 let n,h,metasenv,subst,k = status#obj in
213 let t,metasenv,args = NCicMetaSubst.saturate status ?delta metasenv subst ctx t 0 in
214 let status = status#set_obj (n,h,metasenv,subst,k) in
215 status, (ctx,t), List.map (fun x -> ctx,x) args
217 let saturate a ?delta b = wrap "saturate" (saturate a ?delta) b;;
219 let whd status ?delta ctx t =
220 let status, (_,t) = relocate status ctx t in
221 let _,_,_,subst,_ = status#obj in
222 let t = NCicReduction.whd status ~subst ?delta ctx t in
226 let normalize status ?delta ctx t =
227 let status, (_,t) = relocate status ctx t in
228 let _,_,_,subst,_ = status#obj in
229 let t = NCicTacReduction.normalize status ~subst ?delta ctx t in
233 let unify status ctx a b =
234 let status, (_,a) = relocate status ctx a in
235 let status, (_,b) = relocate status ctx b in
236 let n,h,metasenv,subst,o = status#obj in
237 let metasenv, subst = NCicUnification.unify status metasenv subst ctx a b in
238 status#set_obj (n,h,metasenv,subst,o)
240 let unify a b c d = wrap "unify" (unify a b c) d;;
242 let fix_sorts status (ctx,t) =
244 let name,height,metasenv,subst,obj = status#obj in
246 NCicUnification.fix_sorts status metasenv subst t in
247 let status = status#set_obj (name,height,metasenv,subst,obj) in
250 wrap "fix_sorts" f ()
253 let refine status ctx term expty =
254 let status, (_,term) = relocate status ctx term in
259 let status, (_, e) = relocate status ctx e in status, Some e
261 let name,height,metasenv,subst,obj = status#obj in
262 let metasenv,subst,t,ty =
263 NCicRefiner.typeof status metasenv subst ctx term expty
265 status#set_obj (name,height,metasenv,subst,obj), (ctx,t), (ctx,ty)
267 let refine a b c d = wrap "refine" (refine a b c) d;;
269 let get_goalty status g =
270 let _,_,metasenv,_,_ = status#obj in
272 let _, ctx, ty = NCicUtils.lookup_meta g metasenv in
274 with NCicUtils.Meta_not_found _ as exn -> fail ~exn (lazy "get_goalty")
277 let get_subst status =
278 let _,_,_,subst,_ = status#obj in subst
281 let to_subst status i entry =
282 let name,height,metasenv,subst,obj = status#obj in
283 let metasenv = List.filter (fun j,_ -> j <> i) metasenv in
284 let subst = (i, entry) :: subst in
285 status#set_obj (name,height,metasenv,subst,obj)
288 let instantiate status ?refine:(dorefine=true) i t =
289 let _,_,metasenv,_,_ = status#obj in
290 let gname, context, gty = List.assoc i metasenv in
292 let status, (_,t), (_,ty) = refine status context t (Some (context,gty)) in
293 to_subst status i (gname,context,t,ty)
295 let status,(_,ty) = typeof status context t in
296 to_subst status i (gname,context,snd t,ty)
299 let instantiate_with_ast status i t =
300 let _,_,metasenv,_,_ = status#obj in
301 let gname, context, gty = List.assoc i metasenv in
302 let ggty = mk_cic_term context gty in
303 let status, (_,t) = disambiguate status context t (Some ggty) in
304 to_subst status i (gname,context,t,gty)
307 let mk_meta status ?(attrs=[]) ctx bo_or_ty kind =
310 let status, (_,ty) = relocate status ctx ty in
311 let n,h,metasenv,subst,o = status#obj in
312 let metasenv, _, instance, _ =
313 NCicMetaSubst.mk_meta ~attrs metasenv ctx ~with_type:ty kind
315 let status = status#set_obj (n,h,metasenv,subst,o) in
316 status, (ctx,instance)
318 let status, (_,bo_ as bo) = relocate status ctx bo in
319 let status, (_,ty) = typeof status ctx bo in
320 let n,h,metasenv,subst,o = status#obj in
321 let metasenv, metano, instance, _ =
322 NCicMetaSubst.mk_meta ~attrs metasenv ctx ~with_type:ty kind in
323 let attrs,_,_ = NCicUtils.lookup_meta metano metasenv in
324 let metasenv = List.filter (fun j,_ -> j <> metano) metasenv in
325 let subst = (metano, (attrs, ctx, bo_, ty)) :: subst in
326 let status = status#set_obj (n,h,metasenv,subst,o) in
327 status, (ctx,instance)
330 let mk_in_scope status t =
331 mk_meta status ~attrs:[`InScope] (ctx_of t) (`Def t) `IsTerm
334 let mk_out_scope n status t =
335 mk_meta status ~attrs:[`OutScope n] (ctx_of t) (`Def t) `IsTerm
338 (* the following unification problem will be driven by
339 * select s ~found:mk_in_scope ~postprocess:(mk_out_scope argsno) t pattern
343 * where argsn = length args and the pattern matches t
345 * found is called on every selected term to map them
346 * postprocess is called on the entire term after selection
349 low_status ~found ~postprocess (context,term) (wanted,path)
351 let is_found status ctx t wanted =
352 (* we could lift wanted step-by-step *)
353 pp(lazy("is_found: "^ppterm status (ctx,t)));
354 try true, unify status ctx (ctx, t) wanted
356 | Error (_, Some (NCicUnification.UnificationFailure _))
357 | Error (_, Some (NCicUnification.Uncertain _)) -> false, status
359 let match_term status ctx (wanted : cic_term) t =
360 let rec aux ctx (status,already_found) t =
361 let b, status = is_found status ctx t wanted in
363 let status , (_,t) = found status (ctx, t) in
366 let _,_,_,subst,_ = status#obj in
368 | NCic.Meta (i,lc) when List.mem_assoc i subst ->
369 let _,_,t,_ = NCicUtils.lookup_subst i subst in
370 aux ctx (status,already_found) t
371 | NCic.Meta _ -> (status,already_found),t
373 NCicUntrusted.map_term_fold_a status (fun e c -> e::c) ctx aux
374 (status,already_found) t
376 aux ctx (status,false) t
378 let _,_,_,subst,_ = low_status#obj in
379 let rec select status ctx pat cic =
381 | _, NCic.Meta (i,lc) when List.mem_assoc i subst ->
383 let _,_,t,_ = NCicUtils.lookup_subst i subst in
384 NCicSubstitution.subst_meta status lc t
386 select status ctx pat cic
387 | NCic.LetIn (_,t1,s1,b1), NCic.LetIn (n,t2,s2,b2) ->
388 let status, t = select status ctx t1 t2 in
389 let status, s = select status ctx s1 s2 in
390 let ctx = (n, NCic.Def (s2,t2)) :: ctx in
391 let status, b = select status ctx b1 b2 in
392 status, NCic.LetIn (n,t,s,b)
393 | NCic.Lambda (_,s1,t1), NCic.Lambda (n,s2,t2) ->
394 let status, s = select status ctx s1 s2 in
395 let ctx = (n, NCic.Decl s2) :: ctx in
396 let status, t = select status ctx t1 t2 in
397 status, NCic.Lambda (n,s,t)
398 | NCic.Prod (_,s1,t1), NCic.Prod (n,s2,t2) ->
399 let status, s = select status ctx s1 s2 in
400 let ctx = (n, NCic.Decl s2) :: ctx in
401 let status, t = select status ctx t1 t2 in
402 status, NCic.Prod (n,s,t)
403 | NCic.Appl l1, NCic.Appl l2 when List.length l1 = List.length l2 ->
406 (fun (status,l) x y ->
407 let status, x = select status ctx x y in
411 status, NCic.Appl (List.rev l)
412 | NCic.Match (_,ot1,t1,pl1), NCic.Match (u,ot2,t2,pl2)
413 when List.length pl1 = List.length pl2 ->
414 let status, t = select status ctx t1 t2 in
415 let status, ot = select status ctx ot1 ot2 in
418 (fun (status,l) x y ->
419 let status, x = select status ctx x y in
423 status, NCic.Match (u,ot,t,List.rev pl)
424 | NCic.Implicit `Hole, t ->
427 let status', wanted = disambiguate status ctx wanted None in
428 pp(lazy("wanted: "^ppterm status' wanted));
429 let (status',found), t' = match_term status' ctx wanted t in
430 if found then status',t' else status,t
432 let (status,_),t = match_term status ctx (ctx,t) t in
434 | NCic.Implicit _, t -> status, t
436 fail (lazy ("malformed pattern: " ^ status#ppterm ~metasenv:[]
437 ~context:[] ~subst:[] pat ^ " against " ^
438 status#ppterm ~metasenv:[] ~subst:[] ~context:[] t))
440 pp(lazy ("select in: "^ppterm low_status (context,term)));
441 let status, term = select low_status context path term in
442 let term = (context, term) in
443 pp(lazy ("postprocess: "^ppterm low_status term));
444 postprocess status term
447 let analyse_indty status ty =
448 let status, reduct = whd status (ctx_of ty) ty in
451 | _,NCic.Const ref -> ref, []
452 | _,NCic.Appl (NCic.Const (NRef.Ref (_,(NRef.Ind _)) as ref) :: args) ->
454 | _,_ -> fail (lazy ("not an inductive type: " ^ ppterm status ty)) in
455 let _,lno,tl,_,i = NCicEnvironment.get_checked_indtys status ref in
456 let _,_,_,cl = List.nth tl i in
457 let consno = List.length cl in
458 let left, right = HExtlib.split_nth lno args in
459 status, (ref, consno, left, right)
462 let apply_subst status ctx t =
463 let status, (_,t) = relocate status ctx t in
464 let _,_,_,subst,_ = status#obj in
465 status, (ctx, NCicUntrusted.apply_subst status subst ctx t)
468 let apply_subst_context status ~fix_projections ctx =
469 let _,_,_,subst,_ = status#obj in
470 NCicUntrusted.apply_subst_context status ~fix_projections subst ctx
473 let metas_of_term status (context,t) =
474 let _,_,_,subst,_ = status#obj in
475 NCicUntrusted.metas_of_term status subst context t
478 (* ============= move this elsewhere ====================*)
480 class type ['stack] g_status =
486 class virtual ['stack] status =
487 fun (o: NCic.obj) (s: 'stack) ->
492 method set_stack s = {< stack = s >}
493 method set_status : 'status. 'stack #g_status as 'status -> 'self
494 = fun o -> (self#set_pstatus o)#set_stack o#stack
497 class type virtual lowtac_status = [unit] status
499 type 'status lowtactic = #lowtac_status as 'status -> int -> 'status
501 class type virtual tac_status = [Continuationals.Stack.t] status
503 type 'status tactic = #tac_status as 'status -> 'status
505 let pp_tac_status (status: #tac_status) =
506 prerr_endline (status#ppobj status#obj);
507 prerr_endline ("STACK:\n" ^ Continuationals.Stack.pp status#stack)
510 module NCicInverseRelIndexable : Discrimination_tree.Indexable
511 with type input = cic_term and type constant_name = NUri.uri = struct
513 open Discrimination_tree
515 type input = cic_term
516 type constant_name = NUri.uri
518 let ppelem = function
519 | Constant (uri,arity) ->
520 "("^NUri.name_of_uri uri ^ "," ^ string_of_int arity^")"
522 "("^string_of_int i ^ "," ^ string_of_int arity^")"
524 | Proposition -> "Prop"
529 let string_of_path l = String.concat "." (List.map ppelem l) ;;
531 let path_string_of (ctx,t) =
532 let len_ctx = List.length ctx in
533 let rec aux arity = function
534 | NCic.Appl ((NCic.Meta _|NCic.Implicit _)::_) -> [Variable]
535 | NCic.Appl (NCic.Lambda _ :: _) -> [Variable] (* maybe we should b-reduce *)
536 | NCic.Appl [] -> assert false
537 | NCic.Appl (hd::tl) ->
538 aux (List.length tl) hd @ List.flatten (List.map (aux 0) tl)
539 | NCic.Lambda _ | NCic.Prod _ -> [Variable]
540 (* I think we should CicSubstitution.subst Implicit t *)
541 | NCic.LetIn _ -> [Variable] (* z-reduce? *)
542 | NCic.Meta _ | NCic.Implicit _ -> assert (arity = 0); [Variable]
543 | NCic.Rel i -> [Bound (len_ctx - i, arity)]
544 | NCic.Sort (NCic.Prop) -> assert (arity=0); [Proposition]
545 | NCic.Sort _ -> assert (arity=0); [Datatype]
546 | NCic.Const (NReference.Ref (u,_)) -> [Constant (u, arity)]
547 | NCic.Match _ -> [Dead]
549 let path = aux 0 t in
550 (* prerr_endline (string_of_path path); *)
556 | Constant (u1,a1),Constant (u2,a2) ->
557 let x = NUri.compare u1 u2 in
558 if x = 0 then Pervasives.compare a1 a2 else x
559 | e1,e2 -> Pervasives.compare e1 e2
565 module Ncic_termOT : Set.OrderedType with type t = cic_term =
568 let compare = Pervasives.compare
571 module Ncic_termSet : Set.S with type elt = cic_term = Set.Make(Ncic_termOT)
573 module InvRelDiscriminationTree =
574 Discrimination_tree.Make(NCicInverseRelIndexable)(Ncic_termSet)