aboutsummaryrefslogtreecommitdiffhomepage
path: root/plugins/xml/xmlcommand.ml
blob: b3b2e26549dfacb05155d783874318877f1b9823 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
(************************************************************************)
(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
(*   \VV/  **************************************************************)
(*    //   *   The HELM Project         /   The EU MoWGLI Project       *)
(*         *   University of Bologna                                    *)
(************************************************************************)
(*          This file is distributed under the terms of the             *)
(*           GNU Lesser General Public License Version 2.1              *)
(*                                                                      *)
(*                 Copyright (C) 2000-2004, HELM Team.                  *)
(*                       http://helm.cs.unibo.it                        *)
(************************************************************************)

(* CONFIGURATION PARAMETERS *)

let verbose = ref false;;

(* HOOKS *)
let print_proof_tree, set_print_proof_tree =
 let print_proof_tree = ref (fun _ _ _ _ _ _ -> None) in
  (fun () -> !print_proof_tree),
   (fun f ->
     print_proof_tree :=
     fun
      curi sigma0 pf proof_tree_to_constr proof_tree_to_flattened_proof_tree
      constr_to_ids
     ->
      Some
       (f curi sigma0 pf proof_tree_to_constr
        proof_tree_to_flattened_proof_tree constr_to_ids))
;;

(* UTILITY FUNCTIONS *)

let print_if_verbose s = if !verbose then print_string s;;

(* Next exception is used only inside print_coq_object and tag_of_string_tag *)
exception Uninteresting;;

(* NOT USED anymore, we back to the V6 point of view with global parameters

(* Internally, for Coq V7, params of inductive types are associated     *)
(* not to the whole block of mutual inductive (as it was in V6) but to  *)
(* each member of the block; but externally, all params are required    *)
(* to be the same; the following function checks that the parameters    *)
(* of each inductive of a same block are all the same, then returns     *)
(* this number; it fails otherwise                                      *)
let extract_nparams pack =
 let module D = Declarations in
 let module U = Util in
 let module S = Sign in

  let {D.mind_nparams=nparams0} = pack.(0) in
  let arity0 = pack.(0).D.mind_user_arity in
  let params0, _ = S.decompose_prod_n_assum nparams0 arity0 in
  for i = 1 to Array.length pack - 1 do
    let {D.mind_nparams=nparamsi} = pack.(i) in
    let arityi = pack.(i).D.mind_user_arity in
    let paramsi, _ = S.decompose_prod_n_assum nparamsi arityi in
    if params0 <> paramsi then U.error "Cannot convert a block of inductive definitions with parameters specific to each inductive to a block of mutual inductive definitions with parameters global to the whole block"
  done;
  nparams0

*)

(* could_have_namesakes sp = true iff o is an object that could be cooked and *)
(* than that could exists in cooked form with the same name in a super        *)
(* section of the actual section                                              *)
let could_have_namesakes o sp =      (* namesake = omonimo in italian *)
 let module DK = Decl_kinds in
 let module D = Declare in
  let tag = Libobject.object_tag o in
   print_if_verbose ("Object tag: " ^ tag ^ "\n") ;
   match tag with
      "CONSTANT"        -> true   (* constants/parameters are non global *)
    | "INDUCTIVE"       -> true   (* mutual inductive types are never local   *)
    | "VARIABLE"        -> false  (* variables are local, so no namesakes     *)
    | _                 -> false  (* uninteresting thing that won't be printed*)
;;

(* filter_params pvars hyps *)
(* filters out from pvars (which is a list of lists) all the variables *)
(* that does not belong to hyps (which is a simple list)               *)
(* It returns a list of couples relative section path -- list of       *)
(* variable names.                                                     *)
let filter_params pvars hyps =
 let rec aux ids =
  function
     [] -> []
   | (id,he)::tl ->
      let ids' = id::ids in
      let ids'' =
       "cic:/" ^
        String.concat "/" (List.rev (List.map Names.string_of_id ids')) in
      let he' =
       ids'', List.rev (List.filter (function x -> List.mem x hyps) he) in
      let tl' = aux ids' tl in
       match he' with
          _,[] -> tl'
        | _,_  -> he'::tl'
 in
  let cwd = Lib.cwd () in
  let cwdsp = Libnames.make_path cwd (Names.id_of_string "dummy") in
  let modulepath = Cic2acic.get_module_path_of_full_path cwdsp in
   aux (Names.repr_dirpath modulepath) (List.rev pvars)
;;

type variables_type =
   Definition of string * Term.constr * Term.types
 | Assumption of string * Term.constr
;;

(* The computation is very inefficient, but we can't do anything *)
(* better unless this function is reimplemented in the Declare   *)
(* module.                                                       *)
let search_variables () =
 let module N = Names in
  let cwd = Lib.cwd () in
  let cwdsp = Libnames.make_path cwd (Names.id_of_string "dummy") in
  let modulepath = Cic2acic.get_module_path_of_full_path cwdsp in
   let rec aux =
    function
       [] -> []
     | he::tl as modules ->
        let one_section_variables =
         let dirpath = N.make_dirpath (modules @ N.repr_dirpath modulepath) in
          let t = List.map N.string_of_id (Decls.last_section_hyps dirpath) in
           [he,t]
        in
         one_section_variables @ aux tl
   in
    aux
     (Cic2acic.remove_module_dirpath_from_dirpath
       ~basedir:modulepath cwd)
;;

(* FUNCTIONS TO PRINT A SINGLE OBJECT OF COQ *)

let rec join_dirs cwd =
 function
    []  -> cwd
  | he::tail ->
      (try
        Unix.mkdir cwd 0o775
       with _ -> () (* Let's ignore the errors on mkdir *)
      ) ;
     let newcwd = cwd ^ "/" ^ he in
      join_dirs newcwd tail
;;

let filename_of_path xml_library_root tag =
 let module N = Names in
  match xml_library_root with
     None -> None  (* stdout *)
   | Some xml_library_root' ->
      let tokens = Cic2acic.token_list_of_kernel_name tag in
       Some (join_dirs xml_library_root' tokens)
;;

let body_filename_of_filename =
 function
    Some f -> Some (f ^ ".body")
  | None   -> None
;;

let types_filename_of_filename =
 function
    Some f -> Some (f ^ ".types")
  | None   -> None
;;

let prooftree_filename_of_filename =
 function
    Some f -> Some (f ^ ".proof_tree")
  | None   -> None
;;

let theory_filename xml_library_root =
 let module N = Names in
  match xml_library_root with
    None -> None  (* stdout *)
  | Some xml_library_root' ->
     let toks = List.map N.string_of_id (N.repr_dirpath (Lib.library_dp ())) in
     (* theory from A/B/C/F.v goes into A/B/C/F.theory *)
     let alltoks = List.rev toks in
       Some (join_dirs xml_library_root' alltoks ^ ".theory")

let print_object uri obj sigma proof_tree_infos filename =
 (* function to pretty print and compress an XML file *)
(*CSC: Unix.system "gzip ..." is an horrible non-portable solution. *)
 let pp xml filename =
  Xml.pp xml filename ;
  match filename with
     None -> ()
   | Some fn ->
      let fn' =
       let rec escape s n =
        try
         let p = String.index_from s n '\'' in
          String.sub s n (p - n) ^ "\\'" ^ escape s (p+1)
        with Not_found -> String.sub s n (String.length s - n)
       in
        escape fn 0
      in
       ignore (Unix.system ("gzip " ^ fn' ^ ".xml"))
 in
  let (annobj,_,constr_to_ids,_,ids_to_inner_sorts,ids_to_inner_types,_,_) =
   Cic2acic.acic_object_of_cic_object sigma obj in
  let (xml, xml') = Acic2Xml.print_object uri ids_to_inner_sorts annobj in
  let xmltypes =
   Acic2Xml.print_inner_types uri ids_to_inner_sorts ids_to_inner_types in
  pp xml filename ;
  begin
   match xml' with
      None -> ()
    | Some xml' -> pp xml' (body_filename_of_filename filename)
  end ;
  pp xmltypes (types_filename_of_filename filename) ;
  match proof_tree_infos with
     None -> ()
   | Some (sigma0,proof_tree,proof_tree_to_constr,
           proof_tree_to_flattened_proof_tree) ->
      let xmlprooftree =
       print_proof_tree ()
        uri sigma0 proof_tree proof_tree_to_constr
        proof_tree_to_flattened_proof_tree constr_to_ids
      in
       match xmlprooftree with
          None -> ()
        | Some xmlprooftree ->
           pp xmlprooftree (prooftree_filename_of_filename filename)
;;

let string_list_of_named_context_list =
 List.map
  (function (n,_,_) -> Names.string_of_id n)
;;

(* Function to collect the variables that occur in a term. *)
(* Used only for variables (since for constants and mutual *)
(* inductive types this information is already available.  *)
let find_hyps t =
 let module T = Term in
  let rec aux l t =
   match T.kind_of_term t with
      T.Var id when not (List.mem id l) ->
       let (_,bo,ty) = Global.lookup_named id in
        let boids =
         match bo with
            Some bo' -> aux l bo'
          | None -> l
        in
         id::(aux boids ty)
    | T.Var _
    | T.Rel _
    | T.Meta _
    | T.Evar _
    | T.Sort _ -> l
    | T.Cast (te,_, ty) -> aux (aux l te) ty
    | T.Prod (_,s,t) -> aux (aux l s) t
    | T.Lambda (_,s,t) -> aux (aux l s) t
    | T.LetIn (_,s,_,t) -> aux (aux l s) t
    | T.App (he,tl) -> Array.fold_left (fun i x -> aux i x) (aux l he) tl
    | T.Const con ->
       let hyps = (Global.lookup_constant con).Declarations.const_hyps in
        map_and_filter l hyps @ l
    | T.Ind ind
    | T.Construct (ind,_) ->
       let hyps = (fst (Global.lookup_inductive ind)).Declarations.mind_hyps in
        map_and_filter l hyps @ l
    | T.Case (_,t1,t2,b) ->
       Array.fold_left (fun i x -> aux i x) (aux (aux l t1) t2) b
    | T.Fix (_,(_,tys,bodies))
    | T.CoFix (_,(_,tys,bodies)) ->
       let r = Array.fold_left (fun i x -> aux i x) l tys in
        Array.fold_left (fun i x -> aux i x) r bodies
  and map_and_filter l =
   function
      [] -> []
    | (n,_,_)::tl when not (List.mem n l) -> n::(map_and_filter l tl)
    | _::tl -> map_and_filter l tl
  in
   aux [] t
;;

(* Functions to construct an object *)

let mk_variable_obj id body typ =
 let hyps,unsharedbody =
  match body with
     None -> [],None
   | Some bo -> find_hyps bo, Some (Unshare.unshare bo)
 in
  let hyps' = find_hyps typ @ hyps in
  let hyps'' = List.map Names.string_of_id hyps' in
  let variables = search_variables () in
  let params = filter_params variables hyps'' in
   Acic.Variable
    (Names.string_of_id id, unsharedbody, Unshare.unshare typ, params)
;;

(* Unsharing is not performed on the body, that must be already unshared. *)
(* The evar map and the type, instead, are unshared by this function.     *)
let mk_current_proof_obj is_a_variable id bo ty evar_map env =
 let unshared_ty = Unshare.unshare ty in
 let metasenv =
  List.map
   (function
     (n, {Evd.evar_concl = evar_concl ;
          Evd.evar_hyps = evar_hyps}
      ) ->
       (* We map the named context to a rel context and every Var to a Rel *)
       let final_var_ids,context =
        let rec aux var_ids =
         function
            [] -> var_ids,[]
          | (n,None,t)::tl ->
              let final_var_ids,tl' = aux (n::var_ids) tl in
              let t' = Term.subst_vars var_ids t in
               final_var_ids,(n, Acic.Decl (Unshare.unshare t'))::tl'
          | (n,Some b,t)::tl ->
              let final_var_ids,tl' = aux (n::var_ids) tl in
              let b' = Term.subst_vars var_ids b in
               (* t will not be exported to XML. Thus no unsharing performed *)
               final_var_ids,(n, Acic.Def  (Unshare.unshare b',t))::tl'
        in
         aux [] (List.rev (Environ.named_context_of_val evar_hyps))
       in
        (* We map the named context to a rel context and every Var to a Rel *)
        (n,context,Unshare.unshare (Term.subst_vars final_var_ids evar_concl))
   ) (Evarutil.non_instantiated evar_map)
 in
  let id' = Names.string_of_id id in
   if metasenv = [] then
    let ids =
     Names.Idset.union
      (Environ.global_vars_set env bo) (Environ.global_vars_set env ty) in
    let hyps0 = Environ.keep_hyps env ids in
    let hyps = string_list_of_named_context_list hyps0 in
    (* Variables are the identifiers of the variables in scope *)
    let variables = search_variables () in
    let params = filter_params variables hyps in
     if is_a_variable then
      Acic.Variable (id',Some bo,unshared_ty,params)
     else
      Acic.Constant (id',Some bo,unshared_ty,params)
   else
    Acic.CurrentProof (id',metasenv,bo,unshared_ty)
;;

let mk_constant_obj id bo ty variables hyps =
 let hyps = string_list_of_named_context_list hyps in
 let ty = Unshare.unshare ty in
 let params = filter_params variables hyps in
  match bo with
     None ->
      Acic.Constant (Names.string_of_id id,None,ty,params)
   | Some c ->
      Acic.Constant
       (Names.string_of_id id, Some (Unshare.unshare (Declarations.force c)),
         ty,params)
;;

let mk_inductive_obj sp mib packs variables nparams hyps finite =
 let module D = Declarations in
  let hyps = string_list_of_named_context_list hyps in
  let params = filter_params variables hyps in
(*  let nparams = extract_nparams packs in *)
   let tys =
    let tyno = ref (Array.length packs) in
    Array.fold_right
     (fun p i ->
       decr tyno ;
       let {D.mind_consnames=consnames ;
            D.mind_typename=typename } = p
       in
        let arity = Inductive.type_of_inductive (Global.env()) (mib,p) in
        let lc = Inductiveops.arities_of_constructors (Global.env ()) (sp,!tyno) in
        let cons =
         (Array.fold_right (fun (name,lc) i -> (name,lc)::i)
          (Array.mapi
           (fun j x ->(x,Unshare.unshare lc.(j))) consnames)
          []
         )
        in
         (typename,finite,Unshare.unshare arity,cons)::i
     ) packs []
   in
    Acic.InductiveDefinition (tys,params,nparams)
;;

(* The current channel for .theory files *)
let theory_buffer = Buffer.create 4000;;

let theory_output_string ?(do_not_quote = false) s =
  (* prepare for coqdoc post-processing *)
  let s = if do_not_quote then s else "(** #"^s^"\n#*)\n" in
  print_if_verbose s;
   Buffer.add_string theory_buffer s
;;

let kind_of_global_goal = function
  | Decl_kinds.Global, Decl_kinds.DefinitionBody _ -> "DEFINITION","InteractiveDefinition"
  | Decl_kinds.Global, (Decl_kinds.Proof k) -> "THEOREM",Decl_kinds.string_of_theorem_kind k
  | Decl_kinds.Local, _ -> assert false

let kind_of_inductive isrecord kn =
 "DEFINITION",
 if (fst (Global.lookup_inductive (kn,0))).Declarations.mind_finite
 then if isrecord then "Record" else "Inductive"
 else "CoInductive"
;;

let kind_of_variable id =
  let module DK = Decl_kinds in
  match Decls.variable_kind id with
    | DK.IsAssumption DK.Definitional -> "VARIABLE","Assumption"
    | DK.IsAssumption DK.Logical -> "VARIABLE","Hypothesis"
    | DK.IsAssumption DK.Conjectural -> "VARIABLE","Conjecture"
    | DK.IsDefinition DK.Definition -> "VARIABLE","LocalDefinition"
    | DK.IsProof _ -> "VARIABLE","LocalFact"
    | _ -> Util.anomaly "Unsupported variable kind"
;;

let kind_of_constant kn =
  let module DK = Decl_kinds in
  match Decls.constant_kind kn with
    | DK.IsAssumption DK.Definitional -> "AXIOM","Declaration"
    | DK.IsAssumption DK.Logical -> "AXIOM","Axiom"
    | DK.IsAssumption DK.Conjectural ->
        Pp.warning "Conjecture not supported in dtd (used Declaration instead)";
        "AXIOM","Declaration"
    | DK.IsDefinition DK.Definition -> "DEFINITION","Definition"
    | DK.IsDefinition DK.Example ->
        Pp.warning "Example not supported in dtd (used Definition instead)";
        "DEFINITION","Definition"
    | DK.IsDefinition DK.Coercion ->
        Pp.warning "Coercion not supported in dtd (used Definition instead)";
        "DEFINITION","Definition"
    | DK.IsDefinition DK.SubClass ->
        Pp.warning "SubClass not supported in dtd (used Definition instead)";
        "DEFINITION","Definition"
    | DK.IsDefinition DK.CanonicalStructure ->
        Pp.warning "CanonicalStructure not supported in dtd (used Definition instead)";
        "DEFINITION","Definition"
    | DK.IsDefinition DK.Fixpoint ->
        Pp.warning "Fixpoint not supported in dtd (used Definition instead)";
        "DEFINITION","Definition"
    | DK.IsDefinition DK.CoFixpoint ->
        Pp.warning "CoFixpoint not supported in dtd (used Definition instead)";
        "DEFINITION","Definition"
    | DK.IsDefinition DK.Scheme ->
        Pp.warning "Scheme not supported in dtd (used Definition instead)";
        "DEFINITION","Definition"
    | DK.IsDefinition DK.StructureComponent ->
        Pp.warning "StructureComponent not supported in dtd (used Definition instead)";
        "DEFINITION","Definition"
    | DK.IsDefinition DK.IdentityCoercion ->
        Pp.warning "IdentityCoercion not supported in dtd (used Definition instead)";
        "DEFINITION","Definition"
    | DK.IsDefinition DK.Instance ->
        Pp.warning "Instance not supported in dtd (used Definition instead)";
        "DEFINITION","Definition"
    | DK.IsDefinition DK.Method ->
        Pp.warning "Method not supported in dtd (used Definition instead)";
        "DEFINITION","Definition"
    | DK.IsProof (DK.Theorem|DK.Lemma|DK.Corollary|DK.Fact|DK.Remark as thm) ->
        "THEOREM",DK.string_of_theorem_kind thm
    | DK.IsProof _ ->
        Pp.warning "Unsupported theorem kind (used Theorem instead)";
        "THEOREM",DK.string_of_theorem_kind DK.Theorem
;;

let kind_of_global r =
  let module Ln = Libnames in
  let module DK = Decl_kinds in
  match r with
  | Ln.IndRef kn | Ln.ConstructRef (kn,_) ->
      let isrecord =
	try let _ = Recordops.lookup_projections kn in true
        with Not_found -> false in
      kind_of_inductive isrecord (fst kn)
  | Ln.VarRef id -> kind_of_variable id
  | Ln.ConstRef kn -> kind_of_constant kn
;;

let print_object_kind uri (xmltag,variation) =
  let s =
    Printf.sprintf "<ht:%s uri=\"%s\" as=\"%s\"/>\n" xmltag uri variation
  in
  theory_output_string s
;;

(* print id dest                                                          *)
(*  where sp   is the qualified identifier (section path) of a            *)
(*             definition/theorem, variable or inductive definition       *)
(*  and   dest is either None (for stdout) or (Some filename)             *)
(* pretty prints via Xml.pp the object whose identifier is id on dest     *)
(* Note: it is printed only (and directly) the most cooked available      *)
(*       form of the definition (all the parameters are                   *)
(*       lambda-abstracted, but the object can still refer to variables)  *)
let print internal glob_ref kind xml_library_root =
 let module D = Declarations in
 let module De = Declare in
 let module G = Global in
 let module N = Names in
 let module Nt = Nametab in
 let module T = Term in
 let module X = Xml in
 let module Ln = Libnames in
  (* Variables are the identifiers of the variables in scope *)
  let variables = search_variables () in
  let tag,obj =
   match glob_ref with
      Ln.VarRef id ->
       (* this kn is fake since it is not provided by Coq *)
       let kn =
        let (mod_path,dir_path) = Lib.current_prefix () in
        N.make_kn mod_path dir_path (N.label_of_id id)
       in
       let (_,body,typ) = G.lookup_named id in
        Cic2acic.Variable kn,mk_variable_obj id body typ
    | Ln.ConstRef kn ->
       let id = N.id_of_label (N.con_label kn) in
       let {D.const_body=val0 ; D.const_type = typ ; D.const_hyps = hyps} =
        G.lookup_constant kn in
       let typ = Typeops.type_of_constant_type (Global.env()) typ in
        Cic2acic.Constant kn,mk_constant_obj id val0 typ variables hyps
    | Ln.IndRef (kn,_) ->
       let mib = G.lookup_mind kn in
       let {D.mind_nparams=nparams;
	    D.mind_packets=packs ;
            D.mind_hyps=hyps;
            D.mind_finite=finite} = mib in
          Cic2acic.Inductive kn,mk_inductive_obj kn mib packs variables nparams hyps finite
    | Ln.ConstructRef _ ->
       Util.error ("a single constructor cannot be printed in XML")
  in
  let fn = filename_of_path xml_library_root tag in
  let uri = Cic2acic.uri_of_kernel_name tag in
   if not internal then print_object_kind uri kind;
   print_object uri obj Evd.empty None fn
;;

let print_ref qid fn =
  let ref = Nametab.global qid in
  print false ref (kind_of_global ref) fn

(* show dest                                                  *)
(*  where dest is either None (for stdout) or (Some filename) *)
(* pretty prints via Xml.pp the proof in progress on dest     *)
let show_pftreestate internal fn (kind,pftst) id =
 let pf = Tacmach.proof_of_pftreestate pftst in
 let typ = (Proof_trees.goal_of_proof pf).Evd.evar_concl in
 let val0,evar_map,proof_tree_to_constr,proof_tree_to_flattened_proof_tree,
     unshared_pf
 =
  Proof2aproof.extract_open_pftreestate pftst in
 let env = Global.env () in
 let obj =
  mk_current_proof_obj (fst kind = Decl_kinds.Local) id val0 typ evar_map env in
 let uri =
  match kind with
     Decl_kinds.Local, _ ->
      let uri =
       "cic:/" ^ String.concat "/"
        (Cic2acic.token_list_of_path (Lib.cwd ()) id Cic2acic.TVariable)
      in
      let kind_of_var = "VARIABLE","LocalFact" in
       if not internal then print_object_kind uri kind_of_var;
      uri
   | Decl_kinds.Global, _ ->
      let uri = Cic2acic.uri_of_declaration id Cic2acic.TConstant in
       if not internal then print_object_kind uri (kind_of_global_goal kind);
       uri
 in
  print_object uri obj evar_map
   (Some (Tacmach.evc_of_pftreestate pftst,unshared_pf,proof_tree_to_constr,
    proof_tree_to_flattened_proof_tree)) fn
;;

let show fn =
 let pftst = Pfedit.get_pftreestate () in
 let (id,kind,_,_) = Pfedit.current_proof_statement () in
  show_pftreestate false fn (kind,pftst) id
;;


(* Let's register the callbacks *)
let xml_library_root =
  try
   Some (Sys.getenv "COQ_XML_LIBRARY_ROOT")
  with Not_found -> None
;;

let proof_to_export = ref None (* holds the proof-tree to export *)
;;

let _ =
  Pfedit.set_xml_cook_proof
   (function pftreestate -> proof_to_export := Some pftreestate)
;;

let _ =
  Declare.set_xml_declare_variable
   (function (sp,kn) ->
     let id = Libnames.basename sp in
     print false (Libnames.VarRef id) (kind_of_variable id) xml_library_root ;
     proof_to_export := None)
;;

let _ =
  Declare.set_xml_declare_constant
   (function (internal,kn) ->
     match !proof_to_export with
        None ->
          print internal (Libnames.ConstRef kn) (kind_of_constant kn)
	    xml_library_root
      | Some pftreestate ->
         (* It is a proof. Let's export it starting from the proof-tree *)
         (* I saved in the Pfedit.set_xml_cook_proof callback.          *)
        let fn = filename_of_path xml_library_root (Cic2acic.Constant kn) in
         show_pftreestate internal fn pftreestate
	  (Names.id_of_label (Names.con_label kn)) ;
         proof_to_export := None)
;;

let _ =
  Declare.set_xml_declare_inductive
   (function (isrecord,(sp,kn)) ->
      print false (Libnames.IndRef (Names.mind_of_kn kn,0)) (kind_of_inductive isrecord (Names.mind_of_kn kn))
        xml_library_root)
;;

let _ =
  Vernac.set_xml_start_library
   (function () ->
     Buffer.reset theory_buffer;
     theory_output_string "<?xml version=\"1.0\" encoding=\"latin1\"?>\n";
     theory_output_string ("<!DOCTYPE html [\n" ^
      "<!ENTITY % xhtml-lat1.ent    SYSTEM \"http://helm.cs.unibo.it/dtd/xhtml-lat1.ent\">\n" ^
      "<!ENTITY % xhtml-special.ent SYSTEM \"http://helm.cs.unibo.it/dtd/xhtml-special.ent\">\n" ^
      "<!ENTITY % xhtml-symbol.ent  SYSTEM \"http://helm.cs.unibo.it/dtd/xhtml-symbol.ent\">\n\n" ^
      "%xhtml-lat1.ent;\n" ^
      "%xhtml-special.ent;\n" ^
      "%xhtml-symbol.ent;\n" ^
      "]>\n\n");
     theory_output_string "<html xmlns=\"http://www.w3.org/1999/xhtml\" xmlns:ht=\"http://www.cs.unibo.it/helm/namespaces/helm-theory\" xmlns:helm=\"http://www.cs.unibo.it/helm\">\n";
     theory_output_string "<head></head>\n<body>\n")
;;

let _ =
  Vernac.set_xml_end_library
   (function () ->
      theory_output_string "</body>\n</html>\n";
      let ofn = theory_filename xml_library_root in
       begin
        match ofn with
           None ->
             Buffer.output_buffer stdout theory_buffer ;
         | Some fn ->
             let ch = open_out (fn ^ ".v") in
             Buffer.output_buffer ch theory_buffer ;
             close_out ch;
             (* dummy glob file *)
             let ch = open_out (fn ^ ".glob") in
             close_out ch
       end ;
       Option.iter
	(fun fn ->
	  let coqdoc = Filename.concat (Envars.coqbin ()) ("coqdoc" ^ Coq_config.exec_extension) in
	  let options = " --html -s --body-only --no-index --latin1 --raw-comments" in
          let command cmd =
           if Sys.command cmd <> 0 then
            Util.anomaly ("Error executing \"" ^ cmd ^ "\"")
          in
           command (coqdoc^options^" -o "^fn^".xml "^fn^".v");
           command ("rm "^fn^".v "^fn^".glob");
           print_string("\nWriting on file \"" ^ fn ^ ".xml\" was successful\n"))
       ofn)
;;

let _ = Lexer.set_xml_output_comment (theory_output_string ~do_not_quote:true) ;;

let uri_of_dirpath dir =
  "/" ^ String.concat "/"
    (List.map Names.string_of_id (List.rev (Names.repr_dirpath dir)))
;;

let _ =
  Lib.set_xml_open_section
    (fun _ ->
      let s = "cic:" ^ uri_of_dirpath (Lib.cwd ()) in
      theory_output_string ("<ht:SECTION uri=\""^s^"\">"))
;;

let _ =
  Lib.set_xml_close_section
    (fun _ -> theory_output_string "</ht:SECTION>")
;;

let _ =
  Library.set_xml_require
    (fun d -> theory_output_string
      (Printf.sprintf "<b>Require</b> <a helm:helm_link=\"href\" href=\"theory:%s.theory\">%s</a>.<br/>"
       (uri_of_dirpath d) (Names.string_of_dirpath d)))
;;