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_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