(**************************************************************************)
(*                                                                        *)
(*                                 OCaml                                  *)
(*                                                                        *)
(*                   Fabrice Le Fessant, INRIA Saclay                     *)
(*                                                                        *)
(*   Copyright 1999 Institut National de Recherche en Informatique et     *)
(*     en Automatique.                                                    *)
(*                                                                        *)
(*   All rights reserved.  This file is distributed under the terms of    *)
(*   the GNU Lesser General Public License version 2.1, with the          *)
(*   special exception on linking described in the file LICENSE.          *)
(*                                                                        *)
(**************************************************************************)

open Asttypes;;
open Format;;
open Lexing;;
open Location;;
open Typedtree;;

let fmt_position f l =
  if l.pos_lnum = -1
  then fprintf f "%s[%d]" l.pos_fname l.pos_cnum
  else fprintf f "%s[%d,%d+%d]" l.pos_fname l.pos_lnum l.pos_bol
               (l.pos_cnum - l.pos_bol)
;;

let fmt_location f loc =
  if not !Clflags.locations then ()
  else begin
    fprintf f "(%a..%a)" fmt_position loc.loc_start fmt_position loc.loc_end;
    if loc.loc_ghost then fprintf f " ghost";
  end
;;

let rec fmt_longident_aux f x =
  match x with
  | Longident.Lident (s) -> fprintf f "%s" s;
  | Longident.Ldot (y, s) -> fprintf f "%a.%s" fmt_longident_aux y s;
  | Longident.Lapply (y, z) ->
      fprintf f "%a(%a)" fmt_longident_aux y fmt_longident_aux z;
;;

let fmt_longident f x = fprintf f "\"%a\"" fmt_longident_aux x.txt;;

let fmt_ident = Ident.print

let fmt_modname f = function
  | None -> fprintf f "_";
  | Some id -> Ident.print f id

let rec fmt_path_aux f x =
  match x with
  | Path.Pident (s) -> fprintf f "%a" fmt_ident s;
  | Path.Pdot (y, s) -> fprintf f "%a.%s" fmt_path_aux y s;
  | Path.Papply (y, z) ->
      fprintf f "%a(%a)" fmt_path_aux y fmt_path_aux z;
;;

let fmt_path f x = fprintf f "\"%a\"" fmt_path_aux x;;

let fmt_constant f x =
  match x with
  | Const_int (i) -> fprintf f "Const_int %d" i;
  | Const_char (c) -> fprintf f "Const_char %02x" (Char.code c);
  | Const_string (s, strloc, None) ->
      fprintf f "Const_string(%S,%a,None)" s fmt_location strloc;
  | Const_string (s, strloc, Some delim) ->
      fprintf f "Const_string (%S,%a,Some %S)" s fmt_location strloc delim;
  | Const_float (s) -> fprintf f "Const_float %s" s;
  | Const_int32 (i) -> fprintf f "Const_int32 %ld" i;
  | Const_int64 (i) -> fprintf f "Const_int64 %Ld" i;
  | Const_nativeint (i) -> fprintf f "Const_nativeint %nd" i;
;;

let fmt_mutable_flag f x =
  match x with
  | Immutable -> fprintf f "Immutable";
  | Mutable -> fprintf f "Mutable";
;;

let fmt_virtual_flag f x =
  match x with
  | Virtual -> fprintf f "Virtual";
  | Concrete -> fprintf f "Concrete";
;;

let fmt_override_flag f x =
  match x with
  | Override -> fprintf f "Override";
  | Fresh -> fprintf f "Fresh";
;;

let fmt_closed_flag f x =
  match x with
  | Closed -> fprintf f "Closed"
  | Open -> fprintf f "Open"

let fmt_rec_flag f x =
  match x with
  | Nonrecursive -> fprintf f "Nonrec";
  | Recursive -> fprintf f "Rec";
;;

let fmt_direction_flag f x =
  match x with
  | Upto -> fprintf f "Up";
  | Downto -> fprintf f "Down";
;;

let fmt_private_flag f x =
  match x with
  | Public -> fprintf f "Public";
  | Private -> fprintf f "Private";
;;

let line i f s (*...*) =
  fprintf f "%s" (String.make (2*i) ' ');
  fprintf f s (*...*)
;;

let list i f ppf l =
  match l with
  | [] -> line i ppf "[]\n";
  | _ :: _ ->
     line i ppf "[\n";
     List.iter (f (i+1) ppf) l;
     line i ppf "]\n";
;;

let array i f ppf a =
  if Array.length a = 0 then
    line i ppf "[]\n"
  else begin
    line i ppf "[\n";
    Array.iter (f (i+1) ppf) a;
    line i ppf "]\n"
  end
;;

let option i f ppf x =
  match x with
  | None -> line i ppf "None\n";
  | Some x ->
      line i ppf "Some\n";
      f (i+1) ppf x;
;;

let longident i ppf li = line i ppf "%a\n" fmt_longident li;;
let string i ppf s = line i ppf "\"%s\"\n" s;;
let arg_label i ppf = function
  | Nolabel -> line i ppf "Nolabel\n"
  | Optional s -> line i ppf "Optional \"%s\"\n" s
  | Labelled s -> line i ppf "Labelled \"%s\"\n" s
;;

let record_representation i ppf = let open Types in function
  | Record_regular -> line i ppf "Record_regular\n"
  | Record_float -> line i ppf "Record_float\n"
  | Record_unboxed b -> line i ppf "Record_unboxed %b\n" b
  | Record_inlined i -> line i ppf "Record_inlined %d\n" i
  | Record_extension p -> line i ppf "Record_extension %a\n" fmt_path p

let attribute i ppf k a =
  line i ppf "%s \"%s\"\n" k a.Parsetree.attr_name.txt;
  Printast.payload i ppf a.Parsetree.attr_payload

let attributes i ppf l =
  let i = i + 1 in
  List.iter (fun a ->
    line i ppf "attribute \"%s\"\n" a.Parsetree.attr_name.txt;
    Printast.payload (i + 1) ppf a.Parsetree.attr_payload
  ) l

let rec core_type i ppf x =
  line i ppf "core_type %a\n" fmt_location x.ctyp_loc;
  attributes i ppf x.ctyp_attributes;
  let i = i+1 in
  match x.ctyp_desc with
  | Ttyp_any -> line i ppf "Ttyp_any\n";
  | Ttyp_var (s) -> line i ppf "Ttyp_var %s\n" s;
  | Ttyp_arrow (l, ct1, ct2) ->
      line i ppf "Ttyp_arrow\n";
      arg_label i ppf l;
      core_type i ppf ct1;
      core_type i ppf ct2;
  | Ttyp_tuple l ->
      line i ppf "Ttyp_tuple\n";
      list i core_type ppf l;
  | Ttyp_constr (li, _, l) ->
      line i ppf "Ttyp_constr %a\n" fmt_path li;
      list i core_type ppf l;
  | Ttyp_variant (l, closed, low) ->
      line i ppf "Ttyp_variant closed=%a\n" fmt_closed_flag closed;
      list i label_x_bool_x_core_type_list ppf l;
      option i (fun i -> list i string) ppf low
  | Ttyp_object (l, c) ->
      line i ppf "Ttyp_object %a\n" fmt_closed_flag c;
      let i = i + 1 in
      List.iter (fun {of_desc; of_attributes; _} ->
        match of_desc with
        | OTtag (s, t) ->
            line i ppf "method %s\n" s.txt;
            attributes i ppf of_attributes;
            core_type (i + 1) ppf t
        | OTinherit ct ->
            line i ppf "OTinherit\n";
            core_type (i + 1) ppf ct
        ) l
  | Ttyp_class (li, _, l) ->
      line i ppf "Ttyp_class %a\n" fmt_path li;
      list i core_type ppf l;
  | Ttyp_alias (ct, s) ->
      line i ppf "Ttyp_alias \"%s\"\n" s;
      core_type i ppf ct;
  | Ttyp_poly (sl, ct) ->
      line i ppf "Ttyp_poly%a\n"
        (fun ppf -> List.iter (fun x -> fprintf ppf " '%s" x)) sl;
      core_type i ppf ct;
  | Ttyp_package { pack_path = s; pack_fields = l } ->
      line i ppf "Ttyp_package %a\n" fmt_path s;
      list i package_with ppf l;

and package_with i ppf (s, t) =
  line i ppf "with type %a\n" fmt_longident s;
  core_type i ppf t

and pattern : type k . _ -> _ -> k general_pattern -> unit = fun i ppf x ->
  line i ppf "pattern %a\n" fmt_location x.pat_loc;
  attributes i ppf x.pat_attributes;
  let i = i+1 in
  match x.pat_extra with
    | extra :: rem ->
        pattern_extra i ppf extra;
        pattern i ppf { x with pat_extra = rem }
    | [] ->
  match x.pat_desc with
  | Tpat_any -> line i ppf "Tpat_any\n";
  | Tpat_var (s,_) -> line i ppf "Tpat_var \"%a\"\n" fmt_ident s;
  | Tpat_alias (p, s,_) ->
      line i ppf "Tpat_alias \"%a\"\n" fmt_ident s;
      pattern i ppf p;
  | Tpat_constant (c) -> line i ppf "Tpat_constant %a\n" fmt_constant c;
  | Tpat_tuple (l) ->
      line i ppf "Tpat_tuple\n";
      list i pattern ppf l;
  | Tpat_construct (li, _, po) ->
      line i ppf "Tpat_construct %a\n" fmt_longident li;
      list i pattern ppf po;
  | Tpat_variant (l, po, _) ->
      line i ppf "Tpat_variant \"%s\"\n" l;
      option i pattern ppf po;
  | Tpat_record (l, _c) ->
      line i ppf "Tpat_record\n";
      list i longident_x_pattern ppf l;
  | Tpat_array (l) ->
      line i ppf "Tpat_array\n";
      list i pattern ppf l;
  | Tpat_lazy p ->
      line i ppf "Tpat_lazy\n";
      pattern i ppf p;
  | Tpat_exception p ->
      line i ppf "Tpat_exception\n";
      pattern i ppf p;
  | Tpat_value p ->
      line i ppf "Tpat_value\n";
      pattern i ppf (p :> pattern);
  | Tpat_or (p1, p2, _) ->
      line i ppf "Tpat_or\n";
      pattern i ppf p1;
      pattern i ppf p2;

and pattern_extra i ppf (extra_pat, _, attrs) =
  match extra_pat with
  | Tpat_unpack ->
     line i ppf "Tpat_extra_unpack\n";
     attributes i ppf attrs;
  | Tpat_constraint cty ->
     line i ppf "Tpat_extra_constraint\n";
     attributes i ppf attrs;
     core_type i ppf cty;
  | Tpat_type (id, _) ->
     line i ppf "Tpat_extra_type %a\n" fmt_path id;
     attributes i ppf attrs;
  | Tpat_open (id,_,_) ->
     line i ppf "Tpat_extra_open \"%a\"\n" fmt_path id;
     attributes i ppf attrs;

and expression_extra i ppf x attrs =
  match x with
  | Texp_constraint ct ->
      line i ppf "Texp_constraint\n";
      attributes i ppf attrs;
      core_type i ppf ct;
  | Texp_coerce (cto1, cto2) ->
      line i ppf "Texp_coerce\n";
      attributes i ppf attrs;
      option i core_type ppf cto1;
      core_type i ppf cto2;
  | Texp_poly cto ->
      line i ppf "Texp_poly\n";
      attributes i ppf attrs;
      option i core_type ppf cto;
  | Texp_newtype s ->
      line i ppf "Texp_newtype \"%s\"\n" s;
      attributes i ppf attrs;

and expression i ppf x =
  line i ppf "expression %a\n" fmt_location x.exp_loc;
  attributes i ppf x.exp_attributes;
  let i =
    List.fold_left (fun i (extra,_,attrs) ->
                      expression_extra i ppf extra attrs; i+1)
      (i+1) x.exp_extra
  in
  match x.exp_desc with
  | Texp_ident (li,_,_) -> line i ppf "Texp_ident %a\n" fmt_path li;
  | Texp_instvar (_, li,_) -> line i ppf "Texp_instvar %a\n" fmt_path li;
  | Texp_constant (c) -> line i ppf "Texp_constant %a\n" fmt_constant c;
  | Texp_let (rf, l, e) ->
      line i ppf "Texp_let %a\n" fmt_rec_flag rf;
      list i value_binding ppf l;
      expression i ppf e;
  | Texp_function { arg_label = p; param = _; cases; partial = _; } ->
      line i ppf "Texp_function\n";
      arg_label i ppf p;
      list i case ppf cases;
  | Texp_apply (e, l) ->
      line i ppf "Texp_apply\n";
      expression i ppf e;
      list i label_x_expression ppf l;
  | Texp_match (e, l, _partial) ->
      line i ppf "Texp_match\n";
      expression i ppf e;
      list i case ppf l;
  | Texp_try (e, l) ->
      line i ppf "Texp_try\n";
      expression i ppf e;
      list i case ppf l;
  | Texp_tuple (l) ->
      line i ppf "Texp_tuple\n";
      list i expression ppf l;
  | Texp_construct (li, _, eo) ->
      line i ppf "Texp_construct %a\n" fmt_longident li;
      list i expression ppf eo;
  | Texp_variant (l, eo) ->
      line i ppf "Texp_variant \"%s\"\n" l;
      option i expression ppf eo;
  | Texp_record { fields; representation; extended_expression } ->
      line i ppf "Texp_record\n";
      let i = i+1 in
      line i ppf "fields =\n";
      array (i+1) record_field ppf fields;
      line i ppf "representation =\n";
      record_representation (i+1) ppf representation;
      line i ppf "extended_expression =\n";
      option (i+1) expression ppf extended_expression;
  | Texp_field (e, li, _) ->
      line i ppf "Texp_field\n";
      expression i ppf e;
      longident i ppf li;
  | Texp_setfield (e1, li, _, e2) ->
      line i ppf "Texp_setfield\n";
      expression i ppf e1;
      longident i ppf li;
      expression i ppf e2;
  | Texp_array (l) ->
      line i ppf "Texp_array\n";
      list i expression ppf l;
  | Texp_ifthenelse (e1, e2, eo) ->
      line i ppf "Texp_ifthenelse\n";
      expression i ppf e1;
      expression i ppf e2;
      option i expression ppf eo;
  | Texp_sequence (e1, e2) ->
      line i ppf "Texp_sequence\n";
      expression i ppf e1;
      expression i ppf e2;
  | Texp_while (e1, e2) ->
      line i ppf "Texp_while\n";
      expression i ppf e1;
      expression i ppf e2;
  | Texp_for (s, _, e1, e2, df, e3) ->
      line i ppf "Texp_for \"%a\" %a\n" fmt_ident s fmt_direction_flag df;
      expression i ppf e1;
      expression i ppf e2;
      expression i ppf e3;
  | Texp_send (e, Tmeth_name s, eo) ->
      line i ppf "Texp_send \"%s\"\n" s;
      expression i ppf e;
      option i expression ppf eo
  | Texp_send (e, Tmeth_val s, eo) ->
      line i ppf "Texp_send \"%a\"\n" fmt_ident s;
      expression i ppf e;
      option i expression ppf eo
  | Texp_new (li, _, _) -> line i ppf "Texp_new %a\n" fmt_path li;
  | Texp_setinstvar (_, s, _, e) ->
      line i ppf "Texp_setinstvar \"%a\"\n" fmt_path s;
      expression i ppf e;
  | Texp_override (_, l) ->
      line i ppf "Texp_override\n";
      list i string_x_expression ppf l;
  | Texp_letmodule (s, _, _, me, e) ->
      line i ppf "Texp_letmodule \"%a\"\n" fmt_modname s;
      module_expr i ppf me;
      expression i ppf e;
  | Texp_letexception (cd, e) ->
      line i ppf "Texp_letexception\n";
      extension_constructor i ppf cd;
      expression i ppf e;
  | Texp_assert (e) ->
      line i ppf "Texp_assert";
      expression i ppf e;
  | Texp_lazy (e) ->
      line i ppf "Texp_lazy";
      expression i ppf e;
  | Texp_object (s, _) ->
      line i ppf "Texp_object";
      class_structure i ppf s
  | Texp_pack me ->
      line i ppf "Texp_pack";
      module_expr i ppf me
  | Texp_letop {let_; ands; param = _; body; partial = _} ->
      line i ppf "Texp_letop";
      binding_op (i+1) ppf let_;
      list (i+1) binding_op ppf ands;
      case i ppf body
  | Texp_unreachable ->
      line i ppf "Texp_unreachable"
  | Texp_extension_constructor (li, _) ->
      line i ppf "Texp_extension_constructor %a" fmt_longident li
  | Texp_open (o, e) ->
      line i ppf "Texp_open %a\n"
        fmt_override_flag o.open_override;
      module_expr i ppf o.open_expr;
      attributes i ppf o.open_attributes;
      expression i ppf e;

and value_description i ppf x =
  line i ppf "value_description %a %a\n" fmt_ident x.val_id fmt_location
       x.val_loc;
  attributes i ppf x.val_attributes;
  core_type (i+1) ppf x.val_desc;
  list (i+1) string ppf x.val_prim;

and binding_op i ppf x =
  line i ppf "binding_op %a %a\n" fmt_path x.bop_op_path
    fmt_location x.bop_loc;
  expression i ppf x.bop_exp

and type_parameter i ppf (x, _variance) = core_type i ppf x

and type_declaration i ppf x =
  line i ppf "type_declaration %a %a\n" fmt_ident x.typ_id fmt_location
       x.typ_loc;
  attributes i ppf x.typ_attributes;
  let i = i+1 in
  line i ppf "ptype_params =\n";
  list (i+1) type_parameter ppf x.typ_params;
  line i ppf "ptype_cstrs =\n";
  list (i+1) core_type_x_core_type_x_location ppf x.typ_cstrs;
  line i ppf "ptype_kind =\n";
  type_kind (i+1) ppf x.typ_kind;
  line i ppf "ptype_private = %a\n" fmt_private_flag x.typ_private;
  line i ppf "ptype_manifest =\n";
  option (i+1) core_type ppf x.typ_manifest;

and type_kind i ppf x =
  match x with
  | Ttype_abstract ->
      line i ppf "Ttype_abstract\n"
  | Ttype_variant l ->
      line i ppf "Ttype_variant\n";
      list (i+1) constructor_decl ppf l;
  | Ttype_record l ->
      line i ppf "Ttype_record\n";
      list (i+1) label_decl ppf l;
  | Ttype_open ->
      line i ppf "Ttype_open\n"

and type_extension i ppf x =
  line i ppf "type_extension\n";
  attributes i ppf x.tyext_attributes;
  let i = i+1 in
  line i ppf "ptyext_path = %a\n" fmt_path x.tyext_path;
  line i ppf "ptyext_params =\n";
  list (i+1) type_parameter ppf x.tyext_params;
  line i ppf "ptyext_constructors =\n";
  list (i+1) extension_constructor ppf x.tyext_constructors;
  line i ppf "ptyext_private = %a\n" fmt_private_flag x.tyext_private;

and type_exception i ppf x =
  line i ppf "type_exception\n";
  attributes i ppf x.tyexn_attributes;
  let i = i+1 in
  line i ppf "ptyext_constructor =\n";
  let i = i+1 in
  extension_constructor i ppf x.tyexn_constructor

and extension_constructor i ppf x =
  line i ppf "extension_constructor %a\n" fmt_location x.ext_loc;
  attributes i ppf x.ext_attributes;
  let i = i + 1 in
  line i ppf "pext_name = \"%a\"\n" fmt_ident x.ext_id;
  line i ppf "pext_kind =\n";
  extension_constructor_kind (i + 1) ppf x.ext_kind;

and extension_constructor_kind i ppf x =
  match x with
      Text_decl(a, r) ->
        line i ppf "Text_decl\n";
        constructor_arguments (i+1) ppf a;
        option (i+1) core_type ppf r;
    | Text_rebind(p, _) ->
        line i ppf "Text_rebind\n";
        line (i+1) ppf "%a\n" fmt_path p;

and class_type i ppf x =
  line i ppf "class_type %a\n" fmt_location x.cltyp_loc;
  attributes i ppf x.cltyp_attributes;
  let i = i+1 in
  match x.cltyp_desc with
  | Tcty_constr (li, _, l) ->
      line i ppf "Tcty_constr %a\n" fmt_path li;
      list i core_type ppf l;
  | Tcty_signature (cs) ->
      line i ppf "Tcty_signature\n";
      class_signature i ppf cs;
  | Tcty_arrow (l, co, cl) ->
      line i ppf "Tcty_arrow\n";
      arg_label i ppf l;
      core_type i ppf co;
      class_type i ppf cl;
  | Tcty_open (o, e) ->
      line i ppf "Tcty_open %a %a\n"
        fmt_override_flag o.open_override
        fmt_path (fst o.open_expr);
      class_type i ppf e

and class_signature i ppf { csig_self = ct; csig_fields = l } =
  line i ppf "class_signature\n";
  core_type (i+1) ppf ct;
  list (i+1) class_type_field ppf l;

and class_type_field i ppf x =
  line i ppf "class_type_field %a\n" fmt_location x.ctf_loc;
  let i = i+1 in
  attributes i ppf x.ctf_attributes;
  match x.ctf_desc with
  | Tctf_inherit (ct) ->
      line i ppf "Tctf_inherit\n";
      class_type i ppf ct;
  | Tctf_val (s, mf, vf, ct) ->
      line i ppf "Tctf_val \"%s\" %a %a\n" s fmt_mutable_flag mf
           fmt_virtual_flag vf;
      core_type (i+1) ppf ct;
  | Tctf_method (s, pf, vf, ct) ->
      line i ppf "Tctf_method \"%s\" %a %a\n" s fmt_private_flag pf
           fmt_virtual_flag vf;
      core_type (i+1) ppf ct;
  | Tctf_constraint (ct1, ct2) ->
      line i ppf "Tctf_constraint\n";
      core_type (i+1) ppf ct1;
      core_type (i+1) ppf ct2;
  | Tctf_attribute a ->
      attribute i ppf "Tctf_attribute" a

and class_description i ppf x =
  line i ppf "class_description %a\n" fmt_location x.ci_loc;
  attributes i ppf x.ci_attributes;
  let i = i+1 in
  line i ppf "pci_virt = %a\n" fmt_virtual_flag x.ci_virt;
  line i ppf "pci_params =\n";
  list (i+1) type_parameter ppf x.ci_params;
  line i ppf "pci_name = \"%s\"\n" x.ci_id_name.txt;
  line i ppf "pci_expr =\n";
  class_type (i+1) ppf x.ci_expr;

and class_type_declaration i ppf x =
  line i ppf "class_type_declaration %a\n" fmt_location x.ci_loc;
  let i = i+1 in
  line i ppf "pci_virt = %a\n" fmt_virtual_flag x.ci_virt;
  line i ppf "pci_params =\n";
  list (i+1) type_parameter ppf x.ci_params;
  line i ppf "pci_name = \"%s\"\n" x.ci_id_name.txt;
  line i ppf "pci_expr =\n";
  class_type (i+1) ppf x.ci_expr;

and class_expr i ppf x =
  line i ppf "class_expr %a\n" fmt_location x.cl_loc;
  attributes i ppf x.cl_attributes;
  let i = i+1 in
  match x.cl_desc with
  | Tcl_ident (li, _, l) ->
      line i ppf "Tcl_ident %a\n" fmt_path li;
      list i core_type ppf l;
  | Tcl_structure (cs) ->
      line i ppf "Tcl_structure\n";
      class_structure i ppf cs;
  | Tcl_fun (l, p, _, ce, _) ->
      line i ppf "Tcl_fun\n";
      arg_label i ppf l;
      pattern i ppf p;
      class_expr i ppf ce
  | Tcl_apply (ce, l) ->
      line i ppf "Tcl_apply\n";
      class_expr i ppf ce;
      list i label_x_expression ppf l;
  | Tcl_let (rf, l1, l2, ce) ->
      line i ppf "Tcl_let %a\n" fmt_rec_flag rf;
      list i value_binding ppf l1;
      list i ident_x_expression_def ppf l2;
      class_expr i ppf ce;
  | Tcl_constraint (ce, Some ct, _, _, _) ->
      line i ppf "Tcl_constraint\n";
      class_expr i ppf ce;
      class_type i ppf ct
  | Tcl_constraint (ce, None, _, _, _) -> class_expr i ppf ce
  | Tcl_open (o, e) ->
      line i ppf "Tcl_open %a %a\n"
        fmt_override_flag o.open_override
        fmt_path (fst o.open_expr);
      class_expr i ppf e

and class_structure i ppf { cstr_self = p; cstr_fields = l } =
  line i ppf "class_structure\n";
  pattern (i+1) ppf p;
  list (i+1) class_field ppf l;

and class_field i ppf x =
  line i ppf "class_field %a\n" fmt_location x.cf_loc;
  let i = i + 1 in
  attributes i ppf x.cf_attributes;
  match x.cf_desc with
  | Tcf_inherit (ovf, ce, so, _, _) ->
      line i ppf "Tcf_inherit %a\n" fmt_override_flag ovf;
      class_expr (i+1) ppf ce;
      option (i+1) string ppf so;
  | Tcf_val (s, mf, _, k, _) ->
      line i ppf "Tcf_val \"%s\" %a\n" s.txt fmt_mutable_flag mf;
      class_field_kind (i+1) ppf k
  | Tcf_method (s, pf, k) ->
      line i ppf "Tcf_method \"%s\" %a\n" s.txt fmt_private_flag pf;
      class_field_kind (i+1) ppf k
  | Tcf_constraint (ct1, ct2) ->
      line i ppf "Tcf_constraint\n";
      core_type (i+1) ppf ct1;
      core_type (i+1) ppf ct2;
  | Tcf_initializer (e) ->
      line i ppf "Tcf_initializer\n";
      expression (i+1) ppf e;
  | Tcf_attribute a ->
      attribute i ppf "Tcf_attribute" a

and class_field_kind i ppf = function
  | Tcfk_concrete (o, e) ->
      line i ppf "Concrete %a\n" fmt_override_flag o;
      expression i ppf e
  | Tcfk_virtual t ->
      line i ppf "Virtual\n";
      core_type i ppf t

and class_declaration i ppf x =
  line i ppf "class_declaration %a\n" fmt_location x.ci_loc;
  let i = i+1 in
  line i ppf "pci_virt = %a\n" fmt_virtual_flag x.ci_virt;
  line i ppf "pci_params =\n";
  list (i+1) type_parameter ppf x.ci_params;
  line i ppf "pci_name = \"%s\"\n" x.ci_id_name.txt;
  line i ppf "pci_expr =\n";
  class_expr (i+1) ppf x.ci_expr;

and module_type i ppf x =
  line i ppf "module_type %a\n" fmt_location x.mty_loc;
  attributes i ppf x.mty_attributes;
  let i = i+1 in
  match x.mty_desc with
  | Tmty_ident (li,_) -> line i ppf "Tmty_ident %a\n" fmt_path li;
  | Tmty_alias (li,_) -> line i ppf "Tmty_alias %a\n" fmt_path li;
  | Tmty_signature (s) ->
      line i ppf "Tmty_signature\n";
      signature i ppf s;
  | Tmty_functor (Unit, mt2) ->
      line i ppf "Tmty_functor ()\n";
      module_type i ppf mt2;
  | Tmty_functor (Named (s, _, mt1), mt2) ->
      line i ppf "Tmty_functor \"%a\"\n" fmt_modname s;
      module_type i ppf mt1;
      module_type i ppf mt2;
  | Tmty_with (mt, l) ->
      line i ppf "Tmty_with\n";
      module_type i ppf mt;
      list i longident_x_with_constraint ppf l;
  | Tmty_typeof m ->
      line i ppf "Tmty_typeof\n";
      module_expr i ppf m;

and signature i ppf x = list i signature_item ppf x.sig_items

and signature_item i ppf x =
  line i ppf "signature_item %a\n" fmt_location x.sig_loc;
  let i = i+1 in
  match x.sig_desc with
  | Tsig_value vd ->
      line i ppf "Tsig_value\n";
      value_description i ppf vd;
  | Tsig_type (rf, l) ->
      line i ppf "Tsig_type %a\n" fmt_rec_flag rf;
      list i type_declaration ppf l;
  | Tsig_typesubst l ->
      line i ppf "Tsig_typesubst\n";
      list i type_declaration ppf l;
  | Tsig_typext e ->
      line i ppf "Tsig_typext\n";
      type_extension i ppf e;
  | Tsig_exception ext ->
      line i ppf "Tsig_exception\n";
      type_exception i ppf ext
  | Tsig_module md ->
      line i ppf "Tsig_module \"%a\"\n" fmt_modname md.md_id;
      attributes i ppf md.md_attributes;
      module_type i ppf md.md_type
  | Tsig_modsubst ms ->
      line i ppf "Tsig_modsubst \"%a\" = %a\n"
        fmt_ident ms.ms_id fmt_path ms.ms_manifest;
      attributes i ppf ms.ms_attributes;
  | Tsig_recmodule decls ->
      line i ppf "Tsig_recmodule\n";
      list i module_declaration ppf decls;
  | Tsig_modtype x ->
      line i ppf "Tsig_modtype \"%a\"\n" fmt_ident x.mtd_id;
      attributes i ppf x.mtd_attributes;
      modtype_declaration i ppf x.mtd_type
  | Tsig_open od ->
      line i ppf "Tsig_open %a %a\n"
        fmt_override_flag od.open_override
        fmt_path (fst od.open_expr);
      attributes i ppf od.open_attributes
  | Tsig_include incl ->
      line i ppf "Tsig_include\n";
      attributes i ppf incl.incl_attributes;
      module_type i ppf incl.incl_mod
  | Tsig_class (l) ->
      line i ppf "Tsig_class\n";
      list i class_description ppf l;
  | Tsig_class_type (l) ->
      line i ppf "Tsig_class_type\n";
      list i class_type_declaration ppf l;
  | Tsig_attribute a ->
      attribute i ppf "Tsig_attribute" a

and module_declaration i ppf md =
  line i ppf "%a" fmt_modname md.md_id;
  attributes i ppf md.md_attributes;
  module_type (i+1) ppf md.md_type;

and module_binding i ppf x =
  line i ppf "%a\n" fmt_modname x.mb_id;
  attributes i ppf x.mb_attributes;
  module_expr (i+1) ppf x.mb_expr

and modtype_declaration i ppf = function
  | None -> line i ppf "#abstract"
  | Some mt -> module_type (i + 1) ppf mt

and with_constraint i ppf x =
  match x with
  | Twith_type (td) ->
      line i ppf "Twith_type\n";
      type_declaration (i+1) ppf td;
  | Twith_typesubst (td) ->
      line i ppf "Twith_typesubst\n";
      type_declaration (i+1) ppf td;
  | Twith_module (li,_) -> line i ppf "Twith_module %a\n" fmt_path li;
  | Twith_modsubst (li,_) -> line i ppf "Twith_modsubst %a\n" fmt_path li;

and module_expr i ppf x =
  line i ppf "module_expr %a\n" fmt_location x.mod_loc;
  attributes i ppf x.mod_attributes;
  let i = i+1 in
  match x.mod_desc with
  | Tmod_ident (li,_) -> line i ppf "Tmod_ident %a\n" fmt_path li;
  | Tmod_structure (s) ->
      line i ppf "Tmod_structure\n";
      structure i ppf s;
  | Tmod_functor (Unit, me) ->
      line i ppf "Tmod_functor ()\n";
      module_expr i ppf me;
  | Tmod_functor (Named (s, _, mt), me) ->
      line i ppf "Tmod_functor \"%a\"\n" fmt_modname s;
      module_type i ppf mt;
      module_expr i ppf me;
  | Tmod_apply (me1, me2, _) ->
      line i ppf "Tmod_apply\n";
      module_expr i ppf me1;
      module_expr i ppf me2;
  | Tmod_constraint (me, _, Tmodtype_explicit mt, _) ->
      line i ppf "Tmod_constraint\n";
      module_expr i ppf me;
      module_type i ppf mt;
  | Tmod_constraint (me, _, Tmodtype_implicit, _) -> module_expr i ppf me
  | Tmod_unpack (e, _) ->
      line i ppf "Tmod_unpack\n";
      expression i ppf e;

and structure i ppf x = list i structure_item ppf x.str_items

and structure_item i ppf x =
  line i ppf "structure_item %a\n" fmt_location x.str_loc;
  let i = i+1 in
  match x.str_desc with
  | Tstr_eval (e, attrs) ->
      line i ppf "Tstr_eval\n";
      attributes i ppf attrs;
      expression i ppf e;
  | Tstr_value (rf, l) ->
      line i ppf "Tstr_value %a\n" fmt_rec_flag rf;
      list i value_binding ppf l;
  | Tstr_primitive vd ->
      line i ppf "Tstr_primitive\n";
      value_description i ppf vd;
  | Tstr_type (rf, l) ->
      line i ppf "Tstr_type %a\n" fmt_rec_flag rf;
      list i type_declaration ppf l;
  | Tstr_typext te ->
      line i ppf "Tstr_typext\n";
      type_extension i ppf te
  | Tstr_exception ext ->
      line i ppf "Tstr_exception\n";
      type_exception i ppf ext;
  | Tstr_module x ->
      line i ppf "Tstr_module\n";
      module_binding i ppf x
  | Tstr_recmodule bindings ->
      line i ppf "Tstr_recmodule\n";
      list i module_binding ppf bindings
  | Tstr_modtype x ->
      line i ppf "Tstr_modtype \"%a\"\n" fmt_ident x.mtd_id;
      attributes i ppf x.mtd_attributes;
      modtype_declaration i ppf x.mtd_type
  | Tstr_open od ->
      line i ppf "Tstr_open %a\n"
        fmt_override_flag od.open_override;
      module_expr i ppf od.open_expr;
      attributes i ppf od.open_attributes
  | Tstr_class (l) ->
      line i ppf "Tstr_class\n";
      list i class_declaration ppf (List.map (fun (cl, _) -> cl) l);
  | Tstr_class_type (l) ->
      line i ppf "Tstr_class_type\n";
      list i class_type_declaration ppf (List.map (fun (_, _, cl) -> cl) l);
  | Tstr_include incl ->
      line i ppf "Tstr_include";
      attributes i ppf incl.incl_attributes;
      module_expr i ppf incl.incl_mod;
  | Tstr_attribute a ->
      attribute i ppf "Tstr_attribute" a

and longident_x_with_constraint i ppf (li, _, wc) =
  line i ppf "%a\n" fmt_path li;
  with_constraint (i+1) ppf wc;

and core_type_x_core_type_x_location i ppf (ct1, ct2, l) =
  line i ppf "<constraint> %a\n" fmt_location l;
  core_type (i+1) ppf ct1;
  core_type (i+1) ppf ct2;

and constructor_decl i ppf {cd_id; cd_name = _; cd_args; cd_res; cd_loc;
                            cd_attributes} =
  line i ppf "%a\n" fmt_location cd_loc;
  line (i+1) ppf "%a\n" fmt_ident cd_id;
  attributes i ppf cd_attributes;
  constructor_arguments (i+1) ppf cd_args;
  option (i+1) core_type ppf cd_res

and constructor_arguments i ppf = function
  | Cstr_tuple l -> list i core_type ppf l
  | Cstr_record l -> list i label_decl ppf l

and label_decl i ppf {ld_id; ld_name = _; ld_mutable; ld_type; ld_loc;
                      ld_attributes} =
  line i ppf "%a\n" fmt_location ld_loc;
  attributes i ppf ld_attributes;
  line (i+1) ppf "%a\n" fmt_mutable_flag ld_mutable;
  line (i+1) ppf "%a" fmt_ident ld_id;
  core_type (i+1) ppf ld_type

and longident_x_pattern i ppf (li, _, p) =
  line i ppf "%a\n" fmt_longident li;
  pattern (i+1) ppf p;

and case
    : type k . _ -> _ -> k case -> unit
  = fun i ppf {c_lhs; c_guard; c_rhs} ->
  line i ppf "<case>\n";
  pattern (i+1) ppf c_lhs;
  begin match c_guard with
  | None -> ()
  | Some g -> line (i+1) ppf "<when>\n"; expression (i + 2) ppf g
  end;
  expression (i+1) ppf c_rhs;

and value_binding i ppf x =
  line i ppf "<def>\n";
  attributes (i+1) ppf x.vb_attributes;
  pattern (i+1) ppf x.vb_pat;
  expression (i+1) ppf x.vb_expr

and string_x_expression i ppf (s, _, e) =
  line i ppf "<override> \"%a\"\n" fmt_path s;
  expression (i+1) ppf e;

and record_field i ppf = function
  | _, Overridden (li, e) ->
      line i ppf "%a\n" fmt_longident li;
      expression (i+1) ppf e;
  | _, Kept _ ->
      line i ppf "<kept>"

and label_x_expression i ppf (l, e) =
  line i ppf "<arg>\n";
  arg_label (i+1) ppf l;
  (match e with None -> () | Some e -> expression (i+1) ppf e)

and ident_x_expression_def i ppf (l, e) =
  line i ppf "<def> \"%a\"\n" fmt_ident l;
  expression (i+1) ppf e;

and label_x_bool_x_core_type_list i ppf x =
  match x.rf_desc with
  | Ttag (l, b, ctl) ->
      line i ppf "Ttag \"%s\" %s\n" l.txt (string_of_bool b);
      attributes (i+1) ppf x.rf_attributes;
      list (i+1) core_type ppf ctl
  | Tinherit (ct) ->
      line i ppf "Tinherit\n";
      core_type (i+1) ppf ct
;;

let interface ppf x = list 0 signature_item ppf x.sig_items;;

let implementation ppf x = list 0 structure_item ppf x.str_items;;

let implementation_with_coercion ppf Typedtree.{structure; _} =
  implementation ppf structure