(* This file is part of the Catala compiler, a specification language for tax and social benefits
   computation rules. Copyright (C) 2020 Inria, contributor: Denis Merigoux
   <denis.merigoux@inria.fr>

   Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
   in compliance with the License. You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software distributed under the License
   is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
   or implied. See the License for the specific language governing permissions and limitations under
   the License. *)

(** Source code position *)

type t [@@deriving show]
(** A position in the source code is a file, as well as begin and end location of the form col:line *)

(** Custom visitor for the [Pos.marked] type *)

(**{2 Constructor and getters}*)

val from_lpos : Lexing.position * Lexing.position -> t

val from_info : string -> int -> int -> int -> int -> t

val overwrite_law_info : t -> string list -> t

val get_law_info : t -> string list

val get_start_line : t -> int

val get_start_column : t -> int

val get_end_line : t -> int

val get_end_column : t -> int

val get_file : t -> string

type input_file = FileName of string | Contents of string

(**{2 Formatters}*)

val to_string : t -> string
(** Formats a position like this:

    {v in file <file>, from <start_line>:<start_col> to <end_line>:<end_col> v} *)

val to_string_short : t -> string
(** Formats a position like this:

    {v <file>;<start_line>:<start_col>--<end_line>:<end_col> v} *)

val retrieve_loc_text : t -> string
(** Open the file corresponding to the position and retrieves the text concerned by the position *)

(**{2 AST markings}*)

type 'a marked = 'a * t [@@deriving show]
(** Everything related to the source code should keep its position stored, to improve error messages *)

val no_pos : t
(** Placeholder position *)

val mark : t -> 'a -> 'a marked

val unmark : 'a marked -> 'a

val get_position : 'a marked -> t

val map_under_mark : ('a -> 'b) -> 'a marked -> 'b marked

val same_pos_as : 'a -> 'b marked -> 'a marked

val unmark_option : 'a marked option -> 'a option

(** Visitors *)

class ['self] marked_map :
  object ('self)
    constraint
    'self = < visit_marked : 'a. ('env -> 'a -> 'a) -> 'env -> 'a marked -> 'a marked ; .. >

    method visit_marked : 'a. ('env -> 'a -> 'a) -> 'env -> 'a marked -> 'a marked
  end

class ['self] marked_iter :
  object ('self)
    constraint 'self = < visit_marked : 'a. ('env -> 'a -> unit) -> 'env -> 'a marked -> unit ; .. >

    method visit_marked : 'a. ('env -> 'a -> unit) -> 'env -> 'a marked -> unit
  end