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(**************************************************************************)
(*                                                                        *)
(*                                 OCaml                                  *)
(*                                                                        *)
(*             Xavier Leroy, projet Cristal, INRIA Rocquencourt           *)
(*                                                                        *)
(*   Copyright 1996 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 Format

(* Accessors for the table of toplevel value bindings.  These functions
   must appear as first and second exported functions in this module.
   (See module Translmod.) *)
val getvalue : string -> Obj.t
val setvalue : string -> Obj.t -> unit

(* Set the load paths, before running anything *)

val set_paths : unit -> unit

(* The interactive toplevel loop *)

val loop : formatter -> unit

(* Read and execute a script from the given file *)

val run_script : formatter -> string -> string array -> bool
        (* true if successful, false if error *)

(* Interface with toplevel directives *)

type directive_fun =
   | Directive_none of (unit -> unit)
   | Directive_string of (string -> unit)
   | Directive_int of (int -> unit)
   | Directive_ident of (Longident.t -> unit)
   | Directive_bool of (bool -> unit)

type directive_info = {
  section: string;
  doc: string;
}

val add_directive : string -> directive_fun -> directive_info -> unit
        (* Add toplevel directive and its documentation.

           @since 4.03 *)

val directive_table : (string, directive_fun) Hashtbl.t
  (* Deprecated: please use [add_directive] instead of inserting
     in this table directly. *)

val directive_info_table : (string, directive_info) Hashtbl.t

val toplevel_env : Env.t ref
        (* Typing environment for the toplevel *)
val initialize_toplevel_env : unit -> unit
        (* Initialize the typing environment for the toplevel *)
val print_exception_outcome : formatter -> exn -> unit
        (* Print an exception resulting from the evaluation of user code. *)
val execute_phrase : bool -> formatter -> Parsetree.toplevel_phrase -> bool
        (* Execute the given toplevel phrase. Return [true] if the
           phrase executed with no errors and [false] otherwise.
           First bool says whether the values and types of the results
           should be printed. Uncaught exceptions are always printed. *)
val preprocess_phrase :
    formatter -> Parsetree.toplevel_phrase ->  Parsetree.toplevel_phrase
        (* Preprocess the given toplevel phrase using regular and ppx
           preprocessors. Return the updated phrase. *)
val use_file : formatter -> string -> bool
val use_silently : formatter -> string -> bool
val mod_use_file : formatter -> string -> bool
        (* Read and execute commands from a file.
           [use_file] prints the types and values of the results.
           [use_silently] does not print them.
           [mod_use_file] wrap the file contents into a module. *)
val eval_path: Env.t -> Path.t -> Obj.t
        (* Return the toplevel object referred to by the given path *)
val record_backtrace : unit -> unit

(* Printing of values *)

val print_value: Env.t -> Obj.t -> formatter -> Types.type_expr -> unit
val print_untyped_exception: formatter -> Obj.t -> unit

type ('a, 'b) gen_printer =
  | Zero of 'b
  | Succ of ('a -> ('a, 'b) gen_printer)

val install_printer :
  Path.t -> Types.type_expr -> (formatter -> Obj.t -> unit) -> unit
val install_generic_printer :
  Path.t -> Path.t ->
  (int -> (int -> Obj.t -> Outcometree.out_value,
           Obj.t -> Outcometree.out_value) gen_printer) -> unit
val install_generic_printer' :
  Path.t -> Path.t -> (formatter -> Obj.t -> unit,
                       formatter -> Obj.t -> unit) gen_printer -> unit
val remove_printer : Path.t -> unit

val max_printer_depth: int ref
val max_printer_steps: int ref

(* Hooks for external parsers and printers *)

val parse_toplevel_phrase : (Lexing.lexbuf -> Parsetree.toplevel_phrase) ref
val parse_use_file : (Lexing.lexbuf -> Parsetree.toplevel_phrase list) ref
val print_location : formatter -> Location.t -> unit
val print_error : formatter -> Location.t -> unit
val print_warning : Location.t -> formatter -> Warnings.t -> unit
val input_name : string ref

val print_out_value :
  (formatter -> Outcometree.out_value -> unit) ref
val print_out_type :
  (formatter -> Outcometree.out_type -> unit) ref
val print_out_class_type :
  (formatter -> Outcometree.out_class_type -> unit) ref
val print_out_module_type :
  (formatter -> Outcometree.out_module_type -> unit) ref
val print_out_type_extension :
  (formatter -> Outcometree.out_type_extension -> unit) ref
val print_out_sig_item :
  (formatter -> Outcometree.out_sig_item -> unit) ref
val print_out_signature :
  (formatter -> Outcometree.out_sig_item list -> unit) ref
val print_out_phrase :
  (formatter -> Outcometree.out_phrase -> unit) ref

(* Hooks for external line editor *)

val read_interactive_input : (string -> bytes -> int -> int * bool) ref

(* Hooks for initialization *)

val toplevel_startup_hook : (unit -> unit) ref

(* Used by Trace module *)

val may_trace : bool ref

(* Misc *)

val override_sys_argv : string array -> unit
(* [override_sys_argv args] replaces the contents of [Sys.argv] by [args]
   and reset [Arg.current] to [0].

   This is called by [run_script] so that [Sys.argv] represents
   "script.ml args..." instead of the full command line:
   "ocamlrun unix.cma ... script.ml args...". *)