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Source file coq_util.ml

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open Constrexpr

let debug = ref false

let set_flag flag value f =
  let v = !flag in
  flag := value;
  try
    let res = f () in
    flag := v;
    res
  with exn ->
    flag := v;
    raise exn

let intern_reference qid =
  if !debug then
    Feedback.msg_warning Pp.(str "ir [<-] " ++ Libnames.pr_qualid qid);
  let r =
    try Some (Nametab.locate_extended qid) with
    | Not_found -> None
    (* XXX behavior here is dubious unfortunately, as we see a var as a ref,
       GlobalizationError is raised *)
    | Nametab.GlobalizationError _ -> None
    | _ ->
      Feedback.msg_warning Pp.(str "uuuuuuhgggh");
      None
  in
  let r = Option.bind r Smartlocate.global_of_extended_global in
  if !debug then
    Feedback.msg_warning Pp.(str "ir [->] " ++ Pp.pr_opt Printer.pr_global r);
  r

(* From a term to its representation with notations *)
let recover_notation env sigma t =
  let gt = Constrintern.intern_constr env sigma t in
  set_flag (* Notations = yes *) Constrextern.print_no_symbol false (fun () ->
      let eenv = Constrextern.extern_env env sigma in
      Constrextern.extern_glob_type eenv gt)
  |> fun t ->
  match t.CAst.v with
  | CNotation _ -> Some t
  | _ -> None

let _recover_notation env sigma t =
  try recover_notation env sigma t (* Due to wrong env passed *)
  with exn ->
    Feedback.msg_warning
      (let iexn = Exninfo.capture exn in
       Pp.(str "error in recover_notation: " ++ CErrors.iprint iexn));
    None

(* From a notation to a notation-free term *)
let notation_raw env sigma t =
  if !debug then
    Feedback.msg_warning
      Pp.(str "nr [<-] " ++ Ppconstr.pr_constr_expr env sigma t);
  (* Wish: In place of full internalization + notation-free extern, we could have an operation
   *
   * [expand_notation : constr_expr -> constr_expr]
   * [expand_implicits : constr_expr -> constr_expr]
   *
   *)
  let gt = Constrintern.intern_constr env sigma t in
  let r =
    set_flag (* Notations = no *) Constrextern.print_no_symbol true (fun () ->
        let eenv = Constrextern.extern_env env sigma in
        Constrextern.extern_glob_type eenv gt)
  in
  if !debug then
    Feedback.msg_warning
      Pp.(str "nr [->] " ++ Ppconstr.pr_constr_expr env sigma r);
  r

let notation_raw env sigma t =
  try
    Some (notation_raw env sigma t)
    (* Due to wrong env passed, usually when traversing terms *)
  with exn ->
    Feedback.msg_warning
      (let iexn = Exninfo.capture exn in
       Pp.(str "error in notation_raw: " ++ CErrors.iprint iexn));
    None

module Id = struct
  type 'a t =
    { relative : Libnames.qualid
    ; absolute : Libnames.full_path option
    ; typ : 'a option
    }

  (* Uh, this requires to use the global env... *)
  let type_of_global gref =
    let env = Global.env () in
    let typ, _univs = Typeops.type_of_global_in_context env gref in
    let typ = Arguments_renaming.rename_type typ gref in
    let bl =
      Printer.universe_binders_with_opt_names
        (Environ.universes_of_global env gref)
        None
    in
    let sigma = Evd.from_ctx (UState.of_names bl) in
    Constrextern.extern_type env sigma (EConstr.of_constr typ)

  let type_of_global gref = try Some (type_of_global gref) with _ -> None

  let path_of_global gref =
    try Some (Nametab.path_of_global gref) with _ -> None

  let make qid =
    let gref = intern_reference qid in
    let typ = Option.bind gref type_of_global in
    { relative = qid; absolute = Option.bind gref path_of_global; typ }

  let map_typ ~f info = { info with typ = Option.map f info.typ }
end