OCaml library for JSONfeed parsing and creation
anil.recoil.org
1(*---------------------------------------------------------------------------
2 Copyright (c) 2024 Anil Madhavapeddy. All rights reserved.
3 SPDX-License-Identifier: ISC
4 ---------------------------------------------------------------------------*)
5
6module Unknown = struct
7 type t = (string * Jsont.json) list
8
9 let empty = []
10 let is_empty = function [] -> true | _ -> false
11end
12
13type t = {
14 type_ : string;
15 url : string;
16 unknown : Unknown.t;
17}
18
19let create ~type_ ~url ?(unknown = Unknown.empty) () =
20 { type_; url; unknown }
21
22let type_ t = t.type_
23let url t = t.url
24let unknown t = t.unknown
25
26let equal a b =
27 a.type_ = b.type_ && a.url = b.url
28
29let pp ppf t =
30 Format.fprintf ppf "%s: %s" t.type_ t.url
31
32let jsont =
33 let kind = "Hub" in
34 let doc = "A hub endpoint" in
35 let unknown_mems : (Unknown.t, Jsont.json, Jsont.mem list) Jsont.Object.Mems.map =
36 let open Jsont.Object.Mems in
37 let dec_empty () = [] in
38 let dec_add _meta (name : string) value acc =
39 ((name, Jsont.Meta.none), value) :: acc
40 in
41 let dec_finish _meta mems =
42 List.rev_map (fun ((name, _meta), value) -> (name, value)) mems in
43 let enc = {
44 enc = fun (type acc) (f : Jsont.Meta.t -> string -> Jsont.json -> acc -> acc) unknown (acc : acc) ->
45 List.fold_left (fun acc (name, value) ->
46 f Jsont.Meta.none name value acc
47 ) acc unknown
48 } in
49 map ~kind:"Unknown members" Jsont.json ~dec_empty ~dec_add ~dec_finish ~enc
50 in
51 let create_obj type_ url unknown = create ~type_ ~url ~unknown () in
52 Jsont.Object.map ~kind ~doc create_obj
53 |> Jsont.Object.mem "type" Jsont.string ~enc:type_
54 |> Jsont.Object.mem "url" Jsont.string ~enc:url
55 |> Jsont.Object.keep_unknown unknown_mems ~enc:unknown
56 |> Jsont.Object.finish