71 lines
1.5 KiB
OCaml
71 lines
1.5 KiB
OCaml
type user = [`i | `o | `w]
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type chan_a = [`b]
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type chan_b = [`k | `o | `v]
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type chan_c = [`l]
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type chan_d = [`i | `m | `s | `t | `n]
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type chan = [chan_a | chan_b | chan_c | chan_d]
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type t = [user | chan]
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let to_string = function
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| `b -> "b"
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| `i -> "i"
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| `k -> "k"
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| `l -> "l"
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| `m -> "m"
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| `n -> "n"
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| `o -> "o"
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| `s -> "s"
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| `t -> "t"
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| `v -> "v"
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| `w -> "w"
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let to_char x = (to_string x).[0]
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let pp ppf x = Format.pp_print_string ppf (to_string x)
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let of_char_user = function
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| 'i' -> `i
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| 'o' -> `o
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| 'w' -> `w
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| _ -> invalid_arg "Mode.of_char_user"
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let of_char_chan = function
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| 'b' -> `b
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| 'i' -> `i
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| 'k' -> `k
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| 'l' -> `l
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| 'm' -> `m
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| 'n' -> `n
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| 'o' -> `o
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| 's' -> `s
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| 't' -> `t
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| 'v' -> `v
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| _ -> invalid_arg "Mode.of_char_chan"
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let[@warning "+8"] _check_exhaustive (x : chan) =
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match x with
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| #chan_a -> ()
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| #chan_b -> ()
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| #chan_c -> ()
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| #chan_d -> ()
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let%expect_test _ =
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let roundtrip of_char_x m =
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match of_char_x (to_char m) with
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| m' when m = m' -> ()
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| m' -> Printf.printf "fail:%s!=%s\n" (to_string m) (to_string m')
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| exception Invalid_argument _ -> Printf.printf "error:%s\n" (to_string m)
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in
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let roundtrip_user m = roundtrip of_char_user m in
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let roundtrip_chan m = roundtrip of_char_chan m in
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roundtrip_user `i;
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roundtrip_user `w;
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roundtrip_chan `i;
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roundtrip_chan `k;
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roundtrip_chan `l;
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roundtrip_chan `m;
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roundtrip_chan `n;
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roundtrip_chan `o;
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roundtrip_chan `s;
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roundtrip_chan `t;
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