path: root/dev/top_printers.ml

(************************************************************************)
(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2016     *)
(*   \VV/  **************************************************************)
(*    //   *      This file is distributed under the terms of the       *)
(*         *       GNU Lesser General Public License Version 2.1        *)
(************************************************************************)

(* Printers for the ocaml toplevel. *)

open Util
open Pp
open Names
open Libnames
open Globnames
open Nameops
open Univ
open Environ
open Printer
open Term
open Evd
open Goptions
open Genarg
open Clenv

let _ = Detyping.print_evar_arguments := true
let _ = Detyping.print_universes := true
let _ = set_bool_option_value ["Printing";"Matching"] false
let _ = Detyping.set_detype_anonymous (fun _ _ -> raise Not_found)

(* std_ppcmds *)
let pp   x = Pp.pp_with !Pp_control.std_ft x

(** Future printer *)

let ppfuture kx = pp (Future.print (fun _ -> str "_") kx)

(* name printers *)
let ppid id = pp (pr_id id)
let pplab l = pp (pr_lab l)
let ppmbid mbid = pp (str (MBId.debug_to_string mbid))
let ppdir dir = pp (pr_dirpath dir)
let ppmp mp = pp(str (ModPath.debug_to_string mp))
let ppcon con = pp(debug_pr_con con)
let ppproj con = pp(debug_pr_con (Projection.constant con))
let ppkn kn = pp(str (KerName.to_string kn))
let ppmind kn = pp(debug_pr_mind kn)
let ppind (kn,i) = pp(debug_pr_mind kn ++ str"," ++int i)
let ppsp sp = pp(pr_path sp)
let ppqualid qid = pp(pr_qualid qid)
let ppclindex cl = pp(Classops.pr_cl_index cl)
let ppscheme k = pp (Ind_tables.pr_scheme_kind k)

let pprecarg = function
  | Declarations.Norec -> str "Norec"
  | Declarations.Mrec (mind,i) ->
     str "Mrec[" ++ MutInd.print mind ++ pr_comma () ++ int i ++ str "]"
  | Declarations.Imbr (mind,i) ->
     str "Imbr[" ++ MutInd.print mind ++ pr_comma () ++ int i ++ str "]"
let ppwf_paths x = pp (Rtree.pp_tree pprecarg x)

let pprecarg = function
  | Declarations.Norec -> str "Norec"
  | Declarations.Mrec (mind,i) ->
     str "Mrec[" ++ MutInd.print mind ++ pr_comma () ++ int i ++ str "]"
  | Declarations.Imbr (mind,i) ->
     str "Imbr[" ++ MutInd.print mind ++ pr_comma () ++ int i ++ str "]"
let ppwf_paths x = pp (Rtree.pp_tree pprecarg x)

(* term printers *)
let rawdebug = ref false
let ppevar evk = pp (str (Evd.string_of_existential evk))
let ppconstr x = pp (Termops.print_constr x)
let ppconstr_expr x = pp (Ppconstr.pr_constr_expr x)
let ppconstrdb x = pp(Flags.with_option rawdebug Termops.print_constr x)
let ppterm = ppconstr
let ppsconstr x = ppconstr (Mod_subst.force_constr x)
let ppconstr_univ x = Constrextern.with_universes ppconstr x
let ppglob_constr = (fun x -> pp(pr_lglob_constr x))
let pppattern = (fun x -> pp(pr_constr_pattern x))
let pptype = (fun x -> try pp(pr_ltype x) with e -> pp (str (Printexc.to_string e)))
let ppfconstr c = ppconstr (CClosure.term_of_fconstr c)

let ppbigint n = pp (str (Bigint.to_string n));;

let prset pr l = str "[" ++ hov 0 (prlist_with_sep spc pr l) ++ str "]"
let ppintset l = pp (prset int (Int.Set.elements l))
let ppidset l = pp (prset pr_id (Id.Set.elements l))

let prset' pr l = str "[" ++ hov 0 (prlist_with_sep pr_comma pr l) ++ str "]"

let pridmap pr l =
  let pr (id,b) = pr_id id ++ str "=>" ++ pr id b in
  prset' pr (Id.Map.fold (fun a b l -> (a,b)::l) l [])

let ppidmap pr l = pp (pridmap pr l)

let ppevarsubst = ppidmap (fun id0 -> prset (fun (c,copt,id) ->
  hov 0
  (Termops.print_constr c ++
   (match copt with None -> mt () | Some c -> spc () ++ str "<expanded: " ++
    Termops.print_constr c ++ str">") ++
   (if id = id0 then mt ()
    else spc () ++ str "<canonical: " ++ pr_id id ++ str ">"))))

let prididmap = pridmap (fun _ -> pr_id)
let ppididmap = ppidmap (fun _ -> pr_id)

let prconstrunderbindersidmap = pridmap (fun _ (l,c) ->
  hov 1 (str"[" ++  prlist_with_sep spc Id.print l ++ str"]")
  ++ str "," ++ spc () ++ Termops.print_constr c)

let ppconstrunderbindersidmap l = pp (prconstrunderbindersidmap l)

let ppunbound_ltac_var_map l = ppidmap (fun _ arg ->
  str"<genarg:" ++ pr_argument_type(genarg_tag arg) ++ str">")

open Glob_term

let rec pr_closure {idents=idents;typed=typed;untyped=untyped} =
  hov 1 (str"{idents=" ++ prididmap idents ++ str";" ++ spc() ++
         str"typed=" ++ prconstrunderbindersidmap typed ++ str";" ++ spc() ++
         str"untyped=" ++ pr_closed_glob_constr_idmap untyped ++ str"}")
and pr_closed_glob_constr_idmap x =
  pridmap (fun _ -> pr_closed_glob_constr) x
and pr_closed_glob_constr {closure=closure;term=term} =
  pr_closure closure ++ pr_lglob_constr term

let ppclosure x = pp (pr_closure x)
let ppclosedglobconstr x = pp (pr_closed_glob_constr x)
let ppclosedglobconstridmap x = pp (pr_closed_glob_constr_idmap x)

let pP s = pp (hov 0 s)

let safe_pr_global = function
  | ConstRef kn -> pp (str "CONSTREF(" ++ debug_pr_con kn ++ str ")")
  | IndRef (kn,i) -> pp (str "INDREF(" ++ debug_pr_mind kn ++ str "," ++
			  int i ++ str ")")
  | ConstructRef ((kn,i),j) -> pp (str "INDREF(" ++ debug_pr_mind kn ++ str "," ++
				      int i ++ str "," ++ int j ++ str ")")
  | VarRef id -> pp (str "VARREF(" ++ pr_id id ++ str ")")

let ppglobal x = try pp(pr_global x) with _ -> safe_pr_global x

let ppconst (sp,j) =
    pp (str"#" ++ pr_kn sp ++ str"=" ++ pr_lconstr j.uj_val)

let ppvar ((id,a)) =
    pp (str"#" ++ pr_id id ++ str":" ++ pr_lconstr a)

let genppj f j = let (c,t) = f j in (c ++ str " : " ++ t)

let ppj j = pp (genppj pr_ljudge j)

let prsubst s = pp (Mod_subst.debug_pr_subst s)
let prdelta s = pp (Mod_subst.debug_pr_delta s)

let pp_idpred s = pp (pr_idpred s)
let pp_cpred s = pp (pr_cpred s)
let pp_transparent_state s = pp (pr_transparent_state s)
let pp_stack_t n = pp (Reductionops.Stack.pr Termops.print_constr n)
let pp_cst_stack_t n = pp (Reductionops.Cst_stack.pr n)
let pp_state_t n = pp (Reductionops.pr_state n)

(* proof printers *)
let pr_evar ev = Pp.int (Evar.repr ev)
let ppmetas metas = pp(pr_metaset metas)
let ppevm evd = pp(pr_evar_map ~with_univs:!Flags.univ_print (Some 2) evd)
let ppevmall evd = pp(pr_evar_map ~with_univs:!Flags.univ_print None evd)
let pr_existentialset evars =
  prlist_with_sep spc pr_evar (Evar.Set.elements evars)
let ppexistentialset evars =
  pp (pr_existentialset evars)
let ppexistentialfilter filter = match Evd.Filter.repr filter with
| None -> pp (Pp.str "ø")
| Some f -> pp (prlist_with_sep spc bool f)
let ppclenv clenv = pp(pr_clenv clenv)
let ppgoalgoal gl = pp(Goal.pr_goal gl)
let ppgoal g = pp(Printer.pr_goal g)
let ppgoalsigma g = pp(Printer.pr_goal g ++ pr_evar_map None (Refiner.project g))
let pphintdb db = pp(Hints.pr_hint_db db)
let ppproofview p =
  let gls,sigma = Proofview.proofview p in
  pp(pr_enum Goal.pr_goal gls ++ fnl () ++ pr_evar_map (Some 1) sigma)

let ppopenconstr (x : Evd.open_constr) =
  let (evd,c) = x in pp (pr_evar_map (Some 2) evd ++ pr_constr c)
(* spiwack: deactivated until a replacement is found
let pppftreestate p = pp(print_pftreestate p)
*)

(* let ppgoal g = pp(db_pr_goal g) *)
(* let pr_gls gls = *)
(*   hov 0 (pr_evar_defs (sig_sig gls) ++ fnl () ++ db_pr_goal (sig_it gls)) *)

(* let pr_glls glls = *)
(*   hov 0 (pr_evar_defs (sig_sig glls) ++ fnl () ++ *)
(*          prlist_with_sep fnl db_pr_goal (sig_it glls)) *)

(* let ppsigmagoal g = pp(pr_goal (sig_it g)) *)
(* let prgls gls = pp(pr_gls gls) *)
(* let prglls glls = pp(pr_glls glls) *)
(* let pproof p = pp(print_proof Evd.empty empty_named_context p) *)

let ppuni u = pp(pr_uni u)
let ppuni_level u = pp (Level.pr u)
let ppuniverse u = pp (str"[" ++ Universe.pr u ++ str"]")

let prlev = Universes.pr_with_global_universes
let ppuniverse_set l = pp (LSet.pr prlev l)
let ppuniverse_instance l = pp (Instance.pr prlev l)
let ppuniverse_context l = pp (pr_universe_context prlev l)
let ppuniverse_context_set l = pp (pr_universe_context_set prlev l)
let ppuniverse_subst l = pp (Univ.pr_universe_subst l)
let ppuniverse_opt_subst l = pp (Universes.pr_universe_opt_subst l)
let ppuniverse_level_subst l = pp (Univ.pr_universe_level_subst l)
let ppevar_universe_context l = pp (Evd.pr_evar_universe_context l)
let ppconstraints c = pp (pr_constraints Level.pr c)
let ppuniverseconstraints c = pp (Universes.Constraints.pr c)
let ppuniverse_context_future c = 
  let ctx = Future.force c in
    ppuniverse_context ctx
let ppuniverses u = pp (UGraph.pr_universes Level.pr u)
let ppnamedcontextval e =
  pp (pr_named_context (Global.env ()) Evd.empty (named_context_of_val e))

let ppenv e = pp
  (str "[" ++ pr_named_context_of e Evd.empty ++ str "]" ++ spc() ++
   str "[" ++ pr_rel_context e Evd.empty (rel_context e) ++ str "]")

let ppenvwithcst e = pp
  (str "[" ++ pr_named_context_of e Evd.empty ++ str "]" ++ spc() ++
   str "[" ++ pr_rel_context e Evd.empty (rel_context e) ++ str "]" ++ spc() ++
   str "{" ++ Cmap_env.fold (fun a _ s -> pr_con a ++ spc () ++ s) (Obj.magic e).Pre_env.env_globals.Pre_env.env_constants (mt ()) ++ str "}")

let pptac = (fun x -> pp(Pptactic.pr_glob_tactic (Global.env()) x))

let ppobj obj = Format.print_string (Libobject.object_tag obj)

let cnt = ref 0

let cast_kind_display k =
  match k with
  | VMcast -> "VMcast"
  | DEFAULTcast -> "DEFAULTcast"
  | REVERTcast -> "REVERTcast"
  | NATIVEcast -> "NATIVEcast"

let constr_display csr =
  let rec term_display c = match kind_of_term c with
  | Rel n -> "Rel("^(string_of_int n)^")"
  | Meta n -> "Meta("^(string_of_int n)^")"
  | Var id -> "Var("^(Id.to_string id)^")"
  | Sort s -> "Sort("^(sort_display s)^")"
  | Cast (c,k, t) ->
      "Cast("^(term_display c)^","^(cast_kind_display k)^","^(term_display t)^")"
  | Prod (na,t,c) ->
      "Prod("^(name_display na)^","^(term_display t)^","^(term_display c)^")\n"
  | Lambda (na,t,c) ->
      "Lambda("^(name_display na)^","^(term_display t)^","^(term_display c)^")\n"
  | LetIn (na,b,t,c) ->
      "LetIn("^(name_display na)^","^(term_display b)^","
      ^(term_display t)^","^(term_display c)^")"
  | App (c,l) -> "App("^(term_display c)^","^(array_display l)^")\n"
  | Evar (e,l) -> "Evar("^(string_of_existential e)^","^(array_display l)^")"
  | Const (c,u) -> "Const("^(string_of_con c)^","^(universes_display u)^")"
  | Ind ((sp,i),u) ->
      "MutInd("^(string_of_mind sp)^","^(string_of_int i)^","^(universes_display u)^")"
  | Construct (((sp,i),j),u) ->
      "MutConstruct(("^(string_of_mind sp)^","^(string_of_int i)^"),"
      ^","^(universes_display u)^(string_of_int j)^")"
  | Proj (p, c) -> "Proj("^(string_of_con (Projection.constant p))^","^term_display c ^")"
  | Case (ci,p,c,bl) ->
      "MutCase(<abs>,"^(term_display p)^","^(term_display c)^","
      ^(array_display bl)^")"
  | Fix ((t,i),(lna,tl,bl)) ->
      "Fix(([|"^(Array.fold_right (fun x i -> (string_of_int x)^(if not(i="")
        then (";"^i) else "")) t "")^"|],"^(string_of_int i)^"),"
      ^(array_display tl)^",[|"
      ^(Array.fold_right (fun x i -> (name_display x)^(if not(i="")
        then (";"^i) else "")) lna "")^"|],"
      ^(array_display bl)^")"
  | CoFix(i,(lna,tl,bl)) ->
      "CoFix("^(string_of_int i)^"),"
      ^(array_display tl)^","
      ^(Array.fold_right (fun x i -> (name_display x)^(if not(i="")
        then (";"^i) else "")) lna "")^","
      ^(array_display bl)^")"

  and array_display v =
    "[|"^
    (Array.fold_right
       (fun x i -> (term_display x)^(if not(i="") then (";"^i) else ""))
       v "")^"|]"

  and univ_display u =
    incr cnt; pp (str "with " ++ int !cnt ++ str" " ++ pr_uni u ++ fnl ())

  and level_display u =
    incr cnt; pp (str "with " ++ int !cnt ++ str" " ++ Level.pr u ++ fnl ())

  and sort_display = function
    | Prop(Pos) -> "Prop(Pos)"
    | Prop(Null) -> "Prop(Null)"
    | Type u -> univ_display u;
	"Type("^(string_of_int !cnt)^")"

  and universes_display l = 
    Array.fold_right (fun x i -> level_display x; (string_of_int !cnt)^(if not(i="")
        then (" "^i) else "")) (Instance.to_array l) ""

  and name_display = function
    | Name id -> "Name("^(Id.to_string id)^")"
    | Anonymous -> "Anonymous"

  in
  pp (str (term_display csr) ++fnl ())

open Format;;

let print_pure_constr csr =
  let rec term_display c = match kind_of_term c with
  | Rel n -> print_string "#"; print_int n
  | Meta n -> print_string "Meta("; print_int n; print_string ")"
  | Var id -> print_string (Id.to_string id)
  | Sort s -> sort_display s
  | Cast (c,_, t) -> open_hovbox 1;
      print_string "("; (term_display c); print_cut();
      print_string "::"; (term_display t); print_string ")"; close_box()
  | Prod (Name(id),t,c) ->
      open_hovbox 1;
      print_string"("; print_string (Id.to_string id);
      print_string ":"; box_display t;
      print_string ")"; print_cut();
      box_display c; close_box()
  | Prod (Anonymous,t,c) ->
      print_string"("; box_display t; print_cut(); print_string "->";
      box_display c; print_string ")";
  | Lambda (na,t,c) ->
      print_string "["; name_display na;
      print_string ":"; box_display t; print_string "]";
      print_cut(); box_display c;
  | LetIn (na,b,t,c) ->
      print_string "["; name_display na; print_string "=";
      box_display b; print_cut();
      print_string ":"; box_display t; print_string "]";
      print_cut(); box_display c;
  | App (c,l) ->
      print_string "(";
      box_display c;
      Array.iter (fun x -> print_space (); box_display x) l;
      print_string ")"
  | Evar (e,l) -> print_string "Evar#"; print_int (Evar.repr e); print_string "{";
      Array.iter (fun x -> print_space (); box_display x) l;
      print_string"}"
  | Const (c,u) -> print_string "Cons(";
      sp_con_display c;
      print_string ","; universes_display u;
      print_string ")"
  | Proj (p,c') -> print_string "Proj(";
      sp_con_display (Projection.constant p);
      print_string ",";
      box_display c';
      print_string ")"
  | Ind ((sp,i),u) ->
      print_string "Ind(";
      sp_display sp;
      print_string ","; print_int i;
      print_string ","; universes_display u;
      print_string ")"
  | Construct (((sp,i),j),u) ->
      print_string "Constr(";
      sp_display sp;
      print_string ",";
      print_int i; print_string ","; print_int j; 
      print_string ","; universes_display u;
      print_string ")"
  | Case (ci,p,c,bl) ->
      open_vbox 0;
      print_string "<"; box_display p; print_string ">";
      print_cut(); print_string "Case";
      print_space(); box_display c; print_space (); print_string "of";
      open_vbox 0;
      Array.iter (fun x ->  print_cut();  box_display x) bl;
      close_box();
      print_cut();
      print_string "end";
      close_box()
  | Fix ((t,i),(lna,tl,bl)) ->
      print_string "Fix("; print_int i; print_string ")";
      print_cut();
      open_vbox 0;
      let print_fix () =
        for k = 0 to (Array.length tl) - 1 do
	  open_vbox 0;
	  name_display lna.(k); print_string "/";
	  print_int t.(k); print_cut(); print_string ":";
	  box_display tl.(k) ; print_cut(); print_string ":=";
	  box_display bl.(k); close_box ();
	  print_cut()
        done
      in print_string"{"; print_fix(); print_string"}"
  | CoFix(i,(lna,tl,bl)) ->
      print_string "CoFix("; print_int i; print_string ")";
      print_cut();
      open_vbox 0;
      let print_fix () =
        for k = 0 to (Array.length tl) - 1 do
          open_vbox 1;
	  name_display lna.(k);  print_cut(); print_string ":";
	  box_display tl.(k) ; print_cut(); print_string ":=";
	  box_display bl.(k); close_box ();
	  print_cut();
        done
      in print_string"{"; print_fix (); print_string"}"

  and box_display c = open_hovbox 1; term_display c; close_box()

  and universes_display u =
    Array.iter (fun u -> print_space (); pp (Level.pr u)) (Instance.to_array u)

  and sort_display = function
    | Prop(Pos) -> print_string "Set"
    | Prop(Null) -> print_string "Prop"
    | Type u -> open_hbox();
	print_string "Type("; pp (pr_uni u); print_string ")"; close_box()

  and name_display = function
    | Name id -> print_string (Id.to_string id)
    | Anonymous -> print_string "_"
(* Remove the top names for library and Scratch to avoid long names *)
  and sp_display sp =
(*    let dir,l = decode_kn sp in
    let ls =
      match List.rev_map Id.to_string (DirPath.repr dir) with
          ("Top"::l)-> l
	| ("Coq"::_::l) -> l
	| l             -> l
    in  List.iter (fun x -> print_string x; print_string ".") ls;*)
      print_string (debug_string_of_mind sp)
  and sp_con_display sp =
(*    let dir,l = decode_kn sp in
    let ls =
      match List.rev_map Id.to_string (DirPath.repr dir) with
          ("Top"::l)-> l
	| ("Coq"::_::l) -> l
	| l             -> l
    in  List.iter (fun x -> print_string x; print_string ".") ls;*)
      print_string (debug_string_of_con sp)

  in
    try
     box_display csr; print_flush()
    with e ->
	print_string (Printexc.to_string e);print_flush ();
	raise e

let ppfconstr c = ppconstr (CClosure.term_of_fconstr c)

let pploc x = let (l,r) = Loc.unloc x in
  print_string"(";print_int l;print_string",";print_int r;print_string")"

let pp_argument_type t = pp (pr_argument_type t)

let pp_generic_argument arg =
  pp(str"<genarg:"++pr_argument_type(genarg_tag arg)++str">")

let prgenarginfo arg =
  let Geninterp.Val.Dyn (tag, _) = arg in
  let tpe = Geninterp.Val.pr tag in
  (** FIXME *)
(*   try *)
(*     let data = Pptactic.pr_top_generic (Global.env ()) arg in *)
(*     str "<genarg:" ++ tpe ++ str " := [ " ++ data ++ str " ] >" *)
(*   with _any -> *)
    str "<genarg:" ++ tpe ++ str ">"

let ppgenarginfo arg = pp (prgenarginfo arg)

let ppgenargargt arg = pp (str (Genarg.ArgT.repr arg))

let ppist ist =
  let pr id arg = prgenarginfo arg in
  pp (pridmap pr ist.Geninterp.lfun)

(**********************************************************************)
(* Vernac-level debugging commands                                    *)

let in_current_context f c =
  let (evmap,sign) = Pfedit.get_current_context () in
  f (fst (Constrintern.interp_constr sign evmap c))(*FIXME*)

(* We expand the result of preprocessing to be independent of camlp4

VERNAC COMMAND EXTEND PrintPureConstr
| [ "PrintPureConstr" constr(c) ] -> [ in_current_context print_pure_constr c ]
END
VERNAC COMMAND EXTEND PrintConstr
  [ "PrintConstr" constr(c) ] -> [ in_current_context constr_display c ]
END
*)

open Pcoq
open Genarg
open Stdarg
open Egramml

let _ =
  try
    Vernacinterp.vinterp_add false ("PrintConstr", 0)
      (function
         [c] when genarg_tag c = unquote (topwit wit_constr) && true ->
           let c = out_gen (rawwit wit_constr) c in
           (fun () -> in_current_context constr_display c)
       | _ -> failwith "Vernac extension: cannot occur")
  with
    e -> pp (CErrors.print e)
let _ =
  extend_vernac_command_grammar ("PrintConstr", 0) None
    [GramTerminal "PrintConstr";
      GramNonTerminal
        (Loc.ghost,rawwit wit_constr,Extend.Aentry Pcoq.Constr.constr)]

let _ =
  try
    Vernacinterp.vinterp_add false ("PrintPureConstr", 0)
      (function
         [c] when genarg_tag c = unquote (topwit wit_constr) && true ->
           let c = out_gen (rawwit wit_constr) c in
           (fun () -> in_current_context print_pure_constr c)
       | _ -> failwith "Vernac extension: cannot occur")
  with
    e -> pp (CErrors.print e)
let _ =
  extend_vernac_command_grammar ("PrintPureConstr", 0) None
    [GramTerminal "PrintPureConstr";
      GramNonTerminal
        (Loc.ghost,rawwit wit_constr,Extend.Aentry Pcoq.Constr.constr)]

(* Setting printer of unbound global reference *)
open Names
open Libnames

let encode_path loc prefix mpdir suffix id =
  let dir = match mpdir with
    | None -> []
    | Some (mp,dir) ->
	(DirPath.repr (dirpath_of_string (string_of_mp mp))@
	DirPath.repr dir) in
  Qualid (loc, make_qualid
    (DirPath.make (List.rev (Id.of_string prefix::dir@suffix))) id)

let raw_string_of_ref loc _ = function
  | ConstRef cst ->
      let (mp,dir,id) = repr_con cst in
      encode_path loc "CST" (Some (mp,dir)) [] (Label.to_id id)
  | IndRef (kn,i) ->
      let (mp,dir,id) = repr_mind kn in
      encode_path loc "IND" (Some (mp,dir)) [Label.to_id id]
	(Id.of_string ("_"^string_of_int i))
  | ConstructRef ((kn,i),j) ->
      let (mp,dir,id) = repr_mind kn in
      encode_path loc "CSTR" (Some (mp,dir))
	[Label.to_id id;Id.of_string ("_"^string_of_int i)]
	(Id.of_string ("_"^string_of_int j))
  | VarRef id ->
      encode_path loc "SECVAR" None [] id

let short_string_of_ref loc _ = function
  | VarRef id -> Ident (loc,id)
  | ConstRef cst -> Ident (loc,Label.to_id (pi3 (repr_con cst)))
  | IndRef (kn,0) -> Ident (loc,Label.to_id (pi3 (repr_mind kn)))
  | IndRef (kn,i) ->
      encode_path loc "IND" None [Label.to_id (pi3 (repr_mind kn))]
        (Id.of_string ("_"^string_of_int i))
  | ConstructRef ((kn,i),j) ->
      encode_path loc "CSTR" None
        [Label.to_id (pi3 (repr_mind kn));Id.of_string ("_"^string_of_int i)]
        (Id.of_string ("_"^string_of_int j))

(* Anticipate that printers can be used from ocamldebug and that 
   pretty-printer should not make calls to the global env since ocamldebug
   runs in a different process and does not have the proper env at hand *)
let _ = Flags.in_debugger := true
let _ = Constrextern.set_extern_reference
  (if !rawdebug then raw_string_of_ref else short_string_of_ref)