Source file script_map.ml

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(*****************************************************************************)
(*                                                                           *)
(* Open Source License                                                       *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com>     *)
(* Copyright (c) 2020 Metastate AG <hello@metastate.dev>                     *)
(*                                                                           *)
(* Permission is hereby granted, free of charge, to any person obtaining a   *)
(* copy of this software and associated documentation files (the "Software"),*)
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(* Software is furnished to do so, subject to the following conditions:      *)
(*                                                                           *)
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(* in all copies or substantial portions of the Software.                    *)
(*                                                                           *)
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(* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,  *)
(* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL   *)
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(*                                                                           *)
(*****************************************************************************)

open Alpha_context
open Script_typed_ir

let key_ty : type a b. (a, b) map -> a comparable_ty =
 fun (module Box) -> Box.key_ty

let empty : type a b. a comparable_ty -> (a, b) map =
 fun ty ->
  let module OPS = Map.Make (struct
    type t = a

    let compare = Script_comparable.compare_comparable ty
  end) in
  (module struct
    type key = a

    type value = b

    let key_ty = ty

    module OPS = struct
      type value = b

      include OPS
    end

    let boxed = (OPS.empty, 0)
  end)

let get : type key value. key -> (key, value) map -> value option =
 fun k (module Box) -> Box.OPS.find k (fst Box.boxed)

let update : type a b. a -> b option -> (a, b) map -> (a, b) map =
 fun k v (module Box) ->
  (module struct
    type key = a

    type value = b

    let key_ty = Box.key_ty

    module OPS = Box.OPS

    let boxed =
      let (map, size) = Box.boxed in
      let contains =
        match Box.OPS.find k map with None -> false | _ -> true
      in
      match v with
      | Some v -> (Box.OPS.add k v map, size + if contains then 0 else 1)
      | None -> (Box.OPS.remove k map, size - if contains then 1 else 0)
  end)

let mem : type key value. key -> (key, value) map -> bool =
 fun k (module Box) ->
  match Box.OPS.find k (fst Box.boxed) with None -> false | _ -> true

let fold :
    type key value acc.
    (key -> value -> acc -> acc) -> (key, value) map -> acc -> acc =
 fun f (module Box) -> Box.OPS.fold f (fst Box.boxed)

let size : type key value. (key, value) map -> Script_int.n Script_int.num =
 fun (module Box) -> Script_int.(abs (of_int (snd Box.boxed)))