Source file withExceptions.ml

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let invalid name loc =
  Invalid_argument (Printf.sprintf "%s called from %s" name loc)

module Option = struct
  let get ~loc = function
    | Some v -> v
    | None -> raise (invalid "Lwtreslib.WithExceptions.Option.get" loc)

  let to_exn ~none = function Some v -> v | None -> raise none

  let to_exn_f ~none = function Some v -> v | None -> raise (none ())
end

module Result = struct
  let get_ok ~loc = function
    | Ok v -> v
    | Error _ -> raise (invalid "Lwtreslib.WithExceptions.Result.get_ok" loc)

  let get_error ~loc = function
    | Error e -> e
    | Ok _ -> raise (invalid "Lwtreslib.WithExceptions.Result.get_error" loc)

  let to_exn = function Ok v -> v | Error exc -> raise exc

  let to_exn_f ~error = function Ok v -> v | Error b -> raise (error b)
end

module List = struct
  let rev_combine ~loc xs ys =
    let rec aux acc xs ys =
      match (xs, ys) with
      | ([], []) -> acc
      | (x :: xs, y :: ys) -> aux ((x, y) :: acc) xs ys
      | ([], _ :: _) | (_ :: _, []) ->
          raise (invalid "Lwtreslib.WithExceptions.List.rev_combine" loc)
    in
    aux [] xs ys

  let combine ~loc xs ys =
    let rec aux acc xs ys =
      match (xs, ys) with
      | ([], []) -> acc
      | (x :: xs, y :: ys) -> aux ((x, y) :: acc) xs ys
      | ([], _ :: _) | (_ :: _, []) ->
          raise (invalid "Lwtreslib.WithExceptions.List.combine" loc)
    in
    Stdlib.List.rev (aux [] xs ys)
end