Source file tzString.ml

(*****************************************************************************)
(*                                                                           *)
(* Open Source License                                                       *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com>     *)
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(* copy of this software and associated documentation files (the "Software"),*)
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module Set = Set.Make (String)
module Map = Map.Make (String)

let split delim ?(dup = true) ?(limit = max_int) path =
  let l = String.length path in
  let rec do_slashes acc limit i =
    if i >= l then List.rev acc
    else if path.[i] = delim then
      if dup then do_slashes acc limit (i + 1) else do_split acc limit (i + 1)
    else do_split acc limit i
  and do_split acc limit i =
    if limit <= 0 then
      if i = l then List.rev acc
      else List.rev (String.sub path i (l - i) :: acc)
    else do_component acc (pred limit) i i
  and do_component acc limit i j =
    if j >= l then
      if i = j then List.rev acc
      else List.rev (String.sub path i (j - i) :: acc)
    else if path.[j] = delim then
      do_slashes (String.sub path i (j - i) :: acc) limit j
    else do_component acc limit i (j + 1)
  in
  if limit > 0 then do_slashes [] limit 0 else [path]

let split_path path = split '/' path

let has_prefix ~prefix s =
  let x = String.length prefix in
  let n = String.length s in
  n >= x && String.sub s 0 x = prefix

let remove_prefix ~prefix s =
  let x = String.length prefix in
  let n = String.length s in
  if n >= x && String.sub s 0 x = prefix then Some (String.sub s x (n - x))
  else None

let common_prefix s1 s2 =
  let last = min (String.length s1) (String.length s2) in
  let rec loop i =
    if last <= i then last else if s1.[i] = s2.[i] then loop (i + 1) else i
  in
  loop 0

let mem_char s c = String.index_opt s c <> None

let fold_left f init s =
  let acc = ref init in
  String.iter (fun c -> acc := f !acc c) s ;
  !acc

let is_hex s =
  let len = String.length s in
  len mod 2 = 0
  &&
  try
    String.iter
      (function '0' .. '9' | 'a' .. 'f' | 'A' .. 'F' -> () | _ -> raise Exit)
      s ;
    true
  with Exit -> false

let pp_bytes_hex fmt bytes = Hex.(of_bytes bytes |> pp fmt)