Source file tzList.ml

(*****************************************************************************)
(*                                                                           *)
(* Open Source License                                                       *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com>     *)
(* Copyright (c) 2018-2021 Nomadic Labs, <contact@nomadic-labs.com>          *)
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(* copy of this software and associated documentation files (the "Software"),*)
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(* DEALINGS IN THE SOFTWARE.                                                 *)
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(*****************************************************************************)

let repeat n x =
  let rec loop acc n = if n <= 0 then acc else loop (x :: acc) (n - 1) in
  loop [] n

let rev_split_n n l =
  let rec loop acc n = function
    | [] -> (acc, [])
    | rem when n <= 0 -> (acc, rem)
    | x :: xs -> loop (x :: acc) (pred n) xs
  in
  loop [] n l

let split_n n l =
  let rev_taken, dropped = rev_split_n n l in
  (List.rev rev_taken, dropped)

let rev_take_n n l = fst (rev_split_n n l)

let take_n n l = fst (split_n n l)

let rec drop_n n l =
  if n <= 0 then l else match l with [] -> [] | _ :: xs -> drop_n (n - 1) xs

let all_equal cmp = function [] -> true | x :: xs -> List.for_all (cmp x) xs