Source file uid.ml

(* 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. *)

module type Info = sig
  type info

  val format_info : Format.formatter -> info -> unit
end

module type Id = sig
  type t

  type info

  val fresh : info -> t

  val get_info : t -> info

  val compare : t -> t -> int

  val format_t : Format.formatter -> t -> unit

  val hash : t -> int
end

module Make (X : Info) () : Id with type info = X.info = struct
  type t = { id : int; info : X.info }

  type info = X.info

  let counter = ref 0

  let fresh (info : X.info) : t =
    incr counter;
    { id = !counter; info }

  let get_info (uid : t) : X.info = uid.info

  let compare (x : t) (y : t) : int = compare x.id y.id

  let format_t (fmt : Format.formatter) (x : t) : unit =
    Format.fprintf fmt "%a" X.format_info x.info

  let hash (x : t) : int = x.id
end

module MarkedString = struct
  type info = string Pos.marked

  let format_info fmt (s, _) = Format.fprintf fmt "%s" s
end