package omd

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Source file compat.ml

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module Uchar = struct
  include Uchar

  let rep : Uchar.t = of_int 0xFFFD
end

module List = struct
  include List

  let rec find_map f = function
    | [] -> None
    | x :: xs ->
    match f x with
    | None -> find_map f xs
    | y -> y

  let rec find_opt p = function
    | [] -> None
    | x :: l ->
        if p x then
          Some x
        else
          find_opt p l
end

module Buffer = struct
  include Buffer

  let add_utf_8_uchar b u =
    match Uchar.to_int u with
    | u when u < 0 -> assert false
    | u when u <= 0x007F -> Buffer.add_char b (Char.unsafe_chr u)
    | u when u <= 0x07FF ->
        Buffer.add_char b (Char.unsafe_chr (0xC0 lor (u lsr 6)));
        Buffer.add_char b (Char.unsafe_chr (0x80 lor (u land 0x3F)))
    | u when u <= 0xFFFF ->
        Buffer.add_char b (Char.unsafe_chr (0xE0 lor (u lsr 12)));
        Buffer.add_char b (Char.unsafe_chr (0x80 lor ((u lsr 6) land 0x3F)));
        Buffer.add_char b (Char.unsafe_chr (0x80 lor (u land 0x3F)))
    | u when u <= 0x10FFFF ->
        Buffer.add_char b (Char.unsafe_chr (0xF0 lor (u lsr 18)));
        Buffer.add_char b (Char.unsafe_chr (0x80 lor ((u lsr 12) land 0x3F)));
        Buffer.add_char b (Char.unsafe_chr (0x80 lor ((u lsr 6) land 0x3F)));
        Buffer.add_char b (Char.unsafe_chr (0x80 lor (u land 0x3F)))
    | _ -> assert false
end