45 lines
1.1 KiB
OCaml
45 lines
1.1 KiB
OCaml
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external ( @@ ) : ('a -> 'b) -> 'a -> 'b = "%apply"
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let ($) g f = fun x -> g (f x)
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let id x = x
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let tee f x = ignore @@ f x; x
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let (!%) = Printf.sprintf
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let (!$) x = Lazy.force x
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let slist delim show l =
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String.concat delim @@ List.map show l
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let string_of_chars = slist "" (String.make 1)
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let string1 c = String.make 1 c
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type ('l, 'r) either = Inl of 'l | Inr of 'r
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let maybe f x =
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try Inl (f x) with e -> Inr e
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let value = function
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Inl v -> v | Inr e -> raise e
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let open_with (opn, close) filepath f =
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let ch = opn filepath in
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value @@ tee (fun _ -> close ch) (maybe f ch)
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let open_in_with filepath f = open_with (open_in, close_in) filepath f
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let to_hex n =
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let to_char = function
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| x when 0<=x && x<=9 -> (string_of_int x).[0]
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| x when 10<=x && x<=15 -> char_of_int (int_of_char 'A'+(x-10))
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| _ -> failwith"tohex MNH"
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in
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let rec iter store n =
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if n < 16 then
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to_char n :: store
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else
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let r,q = n / 16, n mod 16 in
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iter (to_char q :: store) r
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in
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if n < 0 then raise (Invalid_argument (!%"to_hex: (%d)" n))
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else string_of_chars @@ iter [] n
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