package ppx_protocol_conv
Ppx for generating serialisation and de-serialisation functions of ocaml types
Install
Dune Dependency
Authors
Maintainers
Sources
ppx_protocol_conv-5.2.2.tbz
sha256=994362c2185d12f732e522e1e457b7de67745e594b898368c878424e93f84587
sha512=237b236a257f35ad671194f6ee0690dfc85eef9b088a928e7b0582b23b5acc19b6727318be6b7abfa0f6c1052047b820e7a0345d8cadb3c0280e18dc3da6e453
doc/src/ppx_protocol_conv.driver/ppx_protocol_driver.ml.html
Source file ppx_protocol_driver.ml
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open Protocol_conv open Runtime open StdLabels module type Parameters = sig val field_name: string -> string val variant_name: string -> string val constructors_without_arguments_as_string: bool val omit_default_values: bool val eager: bool val strict: bool end module Default_parameters : Parameters = struct let field_name name = name let variant_name name = name let constructors_without_arguments_as_string = true let omit_default_values = true let eager = true let strict = false end module type Driver = sig type t val to_string_hum: t -> string val to_list: t -> t list val of_list: t list -> t val is_list: t -> bool val to_alist: t -> (string * t) list val of_alist: (string * t) list -> t val is_alist: t -> bool val to_char: t -> char val of_char: char -> t val to_int: t -> int val of_int: int -> t val to_int32: t -> int32 val of_int32: int32 -> t val to_int64: t -> int64 val of_int64: int64 -> t val to_nativeint: t -> nativeint val of_nativeint: nativeint -> t val to_float: t -> float val of_float: float -> t val to_string: t -> string val of_string: string -> t val is_string: t -> bool val to_bool: t -> bool val of_bool: bool -> t val to_bytes: t -> bytes val of_bytes: bytes -> t val null: t val is_null: t -> bool end let mangle str = let chars = let chars = ref [] in String.iter ~f:(fun ch -> chars := ch :: !chars) str; List.rev !chars in let rec inner = function | '_' :: '_' :: cs -> inner ('_' :: cs) | '_' :: c :: cs -> Char.uppercase_ascii c :: inner cs | '_' :: [] -> [] | c :: cs -> c :: inner cs | [] -> [] in let res_arr = inner chars |> Array.of_list in String.init (Array.length res_arr) ~f:(fun i -> res_arr.(i)) module Make(Driver: Driver)(P: Parameters) = struct type t = Driver.t type error = string * t option exception Protocol_error of error let make_error ?value msg = (msg, value) let error_to_string_hum: error -> string = function | (s, Some t) -> Printf.sprintf "%s. Got: %s" s (Driver.to_string_hum t) | (s, None) -> s (* Register exception printer *) let () = Printexc.register_printer (function | Protocol_error err -> Some (error_to_string_hum err) | _ -> None) let to_string_hum = Driver.to_string_hum let raise_errorf t fmt = Printf.kprintf (fun s -> raise (Protocol_error (s, t))) fmt let try_with: (t -> 'a) -> t -> ('a, error) Runtime.result = fun f t -> match f t with | v -> Ok v | exception (Protocol_error e) -> Error e let wrap t f x = match f x with | v -> v | exception Helper.Protocol_error s -> raise (Protocol_error (s, Some t)) | exception e -> raise (Protocol_error (Printexc.to_string e, Some t)) let to_record: (t, 'a, 'b) Record_in.t -> 'a -> t -> 'b = fun spec constr -> let spec = Helper.map_record_in P.field_name spec in let f = Helper.to_record ~strict:P.strict spec constr in fun t -> wrap t f (wrap t Driver.to_alist t) let of_record: type a. (t, a, t) Record_out.t -> a = fun spec -> let spec = Helper.map_record_out P.field_name spec in Helper.of_record ~omit_default:P.omit_default_values Driver.of_alist spec let to_tuple: (t, 'a, 'b) Tuple_in.t -> 'a -> t -> 'b = fun spec constr -> let f = Helper.to_tuple spec constr in fun t -> wrap t f (wrap t Driver.to_list t) let of_tuple: (t, 'a, t) Tuple_out.t -> 'a = fun spec -> Helper.of_tuple Driver.of_list spec let to_variant: (t, 'a) Variant_in.t list -> t -> 'a = fun spec -> let f = Helper.to_variant (Helper.map_constructor_names P.variant_name spec) in match P.constructors_without_arguments_as_string with | true -> begin function | t when Driver.is_string t -> wrap t (f (wrap t Driver.to_string t)) [] | t when Driver.is_list t -> begin match Driver.to_list t with | name :: args when Driver.is_string name -> wrap t f ((Driver.to_string name)) args | _ :: _ -> raise_errorf (Some t) "First element in the list must be the constructor name when name when deserialising variant" | [] -> raise_errorf (Some t) "Empty list found when deserialising variant" end | t -> raise_errorf (Some t) "Expected list or string when deserialising variant" end | false -> begin function | t when Driver.is_list t -> begin match Driver.to_list t with | name :: args when Driver.is_string name -> wrap t (f (Driver.to_string name)) args | _ :: _ -> raise_errorf (Some t) "First element in the list must be the constructor name when name when deserialising variant" | [] -> raise_errorf (Some t) "Empty list found when deserialising variant" end | t -> raise_errorf (Some t) "Expected list when deserialising variant" end let of_variant: string -> (t, 'a, t) Tuple_out.t -> 'a = let of_variant name = let name = P.variant_name name |> Driver.of_string in function | [] when P.constructors_without_arguments_as_string -> name | ts -> Driver.of_list (name :: ts) in fun name spec -> Helper.of_variant of_variant name spec let get_option = function | t when Driver.is_alist t -> begin match Driver.to_alist t with | [("__option", t)] -> Some t | _ -> None end | _ -> None (* If the type is an empty list, thats also null. *) let to_option: (t -> 'a) -> t -> 'a option = fun to_value_fun -> function | t when Driver.is_null t -> None | t -> let t = match (get_option t) with Some t -> t | None -> t in Some (to_value_fun t) let of_option: ('a -> t) -> 'a option -> t = fun of_value_fun -> function | None -> Driver.null | Some v -> let mk_option t = Driver.of_alist [ ("__option", t) ] in match of_value_fun v with | t when Driver.is_null t -> mk_option t | t when (get_option t) <> None -> mk_option t | t -> t let to_ref: (t -> 'a) -> t -> 'a ref = fun to_value_fun t -> let v = to_value_fun t in ref v let of_ref: ('a -> t) -> 'a ref -> t = fun of_value_fun v -> of_value_fun !v let to_result: (t -> 'a) -> (t -> 'b) -> t -> ('a, 'b) result = fun to_ok to_err -> let ok = Runtime.Tuple_in.(Cons (to_ok, Nil)) in let err = Runtime.Tuple_in.(Cons (to_err, Nil)) in to_variant Runtime.Variant_in.[Variant ("Ok", ok, fun v -> Ok v); Variant ("Error", err, fun v -> Error v)] let of_result: ('a -> t) -> ('b -> t) -> ('a, 'b) result -> t = fun of_ok of_err -> let of_ok = of_variant "Ok" Runtime.Tuple_out.(Cons (of_ok, Nil)) in let of_err = of_variant "Error" Runtime.Tuple_out.(Cons (of_err, Nil)) in function | Ok ok -> of_ok ok | Error err -> of_err err let to_list: (t -> 'a) -> t -> 'a list = fun to_value_fun t -> Helper.list_map ~f:to_value_fun (wrap t Driver.to_list t) let of_list: ('a -> t) -> 'a list -> t = fun of_value_fun v -> Helper.list_map ~f:of_value_fun v |> Driver.of_list let to_array: (t -> 'a) -> t -> 'a array = fun to_value_fun t -> to_list to_value_fun t |> Array.of_list let of_array: ('a -> t) -> 'a array -> t = fun of_value_fun v -> Array.to_list v |> of_list of_value_fun let to_lazy_t: (t -> 'a) -> t -> 'a lazy_t = fun to_value_fun -> match P.eager with | true -> fun t -> Lazy.from_val (to_value_fun t) | false -> fun t -> Lazy.from_fun (fun () -> to_value_fun t) let of_lazy_t: ('a -> t) -> 'a lazy_t -> t = fun of_value_fun v -> Lazy.force v |> of_value_fun let to_char t = try Driver.to_char t with _ -> raise_errorf (Some t) "char expected" let of_char = Driver.of_char let to_int t = try Driver.to_int t with _ -> raise_errorf (Some t) "int expected" let of_int = Driver.of_int let to_int32 t = try Driver.to_int32 t with _ -> raise_errorf (Some t) "int32 expected" let of_int32 = Driver.of_int32 let to_int64 t = try Driver.to_int64 t with _ -> raise_errorf (Some t) "int64 expected" let of_int64 = Driver.of_int64 let to_nativeint t = try Driver.to_nativeint t with _ -> raise_errorf (Some t) "nativeint expected" let of_nativeint = Driver.of_nativeint let to_string t = try Driver.to_string t with _ -> raise_errorf (Some t) "string expected" let of_string = Driver.of_string let to_float t = try Driver.to_float t with _ -> raise_errorf (Some t) "float expected" let of_float = Driver.of_float let to_bool t = try Driver.to_bool t with _ -> raise_errorf (Some t) "bool expected" let of_bool = Driver.of_bool let to_bytes t = try Driver.to_bytes t with _ -> raise_errorf (Some t) "bytes expected" let of_bytes = Driver.of_bytes let to_unit t = to_option (fun _ -> ()) t |> function Some _ -> raise_errorf (Some t) "Unit expected" | None -> () let of_unit () = of_option (fun _ -> failwith "Should call with None") None end
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