package ocaml-protoc-plugin

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Source file result.ml

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type error =
  [ `Premature_end_of_input
  | `Unknown_field_type of int
  | `Wrong_field_type of string * string
  | `Illegal_value of string * Field.t
  | `Unknown_enum_value of int
  | `Unknown_enum_name of string
  | `Required_field_missing of int * string ]

exception Error of error
type 'a t = ('a, error) result

let raise error = raise (Error error)
let catch f = try Ok (f ()) with Error (#error as v) -> Error v

let ( >>| ) : 'a t -> ('a -> 'b) -> 'b t = function Ok x -> fun f -> Ok (f x) | Error err -> fun _ -> Error err
let ( >>= ) : 'a t -> ('a -> 'b t) -> 'b t = function Ok x -> fun f -> f x | Error err -> fun _ -> Error err
let return x = Ok x

let fail : error -> 'a t = fun x -> Error x
let get ~msg = function
  | Ok v -> v
  | Error _ -> failwith msg

let pp_error : Format.formatter -> [> error] -> unit = fun fmt -> function
  | `Premature_end_of_input ->
    Format.pp_print_string fmt
      "`Premature_end_of_input"
  | `Unknown_field_type x ->
    (Format.fprintf fmt
       "`Unknown_field_type (@[<hov>";
     (Format.fprintf fmt "%d") x;
     Format.fprintf fmt "@])")
  | `Wrong_field_type x ->
    (Format.fprintf fmt
       "`Wrong_field_type (@[<hov>";
     ((fun (a0, a1) ->
         Format.fprintf fmt "(@[";
         ((Format.fprintf fmt "%S") a0;
          Format.fprintf fmt ",@ ";
          (Format.fprintf fmt "%S") a1);
         Format.fprintf fmt "@])")) x;
     Format.fprintf fmt "@])")
  | `Illegal_value x ->
    (Format.fprintf fmt
       "`Illegal_value (@[<hov>";
     ((fun (a0, a1) ->
         Format.fprintf fmt "(@[";
         ((Format.fprintf fmt "%S") a0;
          Format.fprintf fmt ",@ ";
          (Field.pp fmt) a1);
         Format.fprintf fmt "@])")) x;
     Format.fprintf fmt "@])")
  | `Unknown_enum_value x ->
    (Format.fprintf fmt
       "`Unknown_enum_value (@[<hov>";
     (Format.fprintf fmt "%d") x;
     Format.fprintf fmt "@])")
  | `Unknown_enum_name x ->
    (Format.fprintf fmt
       "`Unknown_enum_name (@[<hov>";
     (Format.fprintf fmt "%s") x;
     Format.fprintf fmt "@])")
  | `Oneof_missing ->
    Format.pp_print_string fmt "`Oneof_missing"
  | `Required_field_missing x ->
    (Format.fprintf fmt
       "`Required_field_missing (@[<hov>";
     ((fun (a0, a1) ->
         Format.fprintf fmt "(@[";
         ((Format.fprintf fmt "%d") a0;
          Format.fprintf fmt ",@ ";
          (Format.fprintf fmt "%s") a1);
         Format.fprintf fmt "@])")) x;
     Format.fprintf fmt "@])")

let show_error : error -> string = Format.asprintf "%a" pp_error

let _ =
  Printexc.register_printer (function Error e -> Printf.sprintf "Ocaml_protoc_plugin.Result.Error (%s)" (show_error e) |> Option.some | _ -> None)

let pp pp fmt = function
  | Ok v -> Format.fprintf fmt "Ok %a" pp v
  | Error (#error as e) -> Format.fprintf fmt "Error %a" pp_error e

(* let show : 'a t -> string = Format.asprintf "%a" pp *)