2023-10-08 12:14:38 +02:00
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open! Base
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2023-10-11 01:19:56 +02:00
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type t = Temperature of float
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let temperature f = Temperature f
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let value (Temperature f) = f
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2023-10-08 12:14:38 +02:00
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let parse s =
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2023-10-11 01:19:56 +02:00
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let re = Str.regexp " t=\\([0-9]+\\)" in
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try
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if (Str.search_forward re s 0) > 0
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then Some (Float.of_string (Str.matched_group 1 s) /. 1000.0)
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else None
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with Stdlib.Not_found -> None
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2023-10-08 12:14:38 +02:00
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2023-10-11 01:19:56 +02:00
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let%test_unit "parse temperature" =
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[%test_eq: float option] (parse "brol\nmore junk text t=18241") (Some 18.241)
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2023-10-08 12:14:38 +02:00
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let read_temperature file_name =
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let open Lwt.Infix in
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2023-10-11 01:19:56 +02:00
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Lwt_io.with_file ~mode:Lwt_io.Input file_name (fun ic ->
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Lwt_io.read ic >>= (fun s ->
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parse s |> Option.map ~f:temperature |> Lwt.return
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2023-10-08 12:14:38 +02:00
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)
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2023-10-11 01:19:56 +02:00
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)
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let write_test_file file_name =
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Lwt_io.with_file ~mode:Lwt_io.Output file_name (fun oc ->
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Lwt_io.write_line oc "brol\nmore junk text t=18241"
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)
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let%test "read temperature from file" =
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let open Lwt.Infix in
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let file_name = "test_temperature.txt" in
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let aux = write_test_file file_name
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>>= fun () -> (read_temperature file_name)
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>>= function
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| Some (Temperature t) -> Lwt.return Float.(t = 18.241)
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| _ -> Lwt.return false
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in Lwt_main.run aux
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