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 url : string;
15 doi : string option;
16 cito : Cito.t list option;
17 unknown : Unknown.t;
18}
19
20let create ~url ?doi ?cito ?(unknown = Unknown.empty) () =
21 { url; doi; cito; unknown }
22
23let url t = t.url
24let doi t = t.doi
25let cito t = t.cito
26let unknown t = t.unknown
27
28let equal a b = String.equal a.url b.url
29
30let pp ppf t =
31 let open Format in
32 fprintf ppf "%s" t.url;
33 match t.doi with
34 | Some d -> fprintf ppf " [DOI: %s]" d
35 | None -> ()
36
37let jsont =
38 let kind = "Reference" in
39 let doc = "A reference to a cited source" in
40 let unknown_mems : (Unknown.t, Jsont.json, Jsont.mem list) Jsont.Object.Mems.map =
41 let open Jsont.Object.Mems in
42 let dec_empty () = [] in
43 let dec_add _meta (name : string) value acc =
44 ((name, Jsont.Meta.none), value) :: acc
45 in
46 let dec_finish _meta mems =
47 List.rev_map (fun ((name, _meta), value) -> (name, value)) mems in
48 let enc = {
49 enc = fun (type acc) (f : Jsont.Meta.t -> string -> Jsont.json -> acc -> acc) unknown (acc : acc) ->
50 List.fold_left (fun acc (name, value) ->
51
52 f Jsont.Meta.none name value acc
53 ) acc unknown
54 } in
55 map ~kind:"Unknown members" Jsont.json ~dec_empty ~dec_add ~dec_finish ~enc
56 in
57 let create_obj url doi cito unknown = create ~url ?doi ?cito ~unknown () in
58 Jsont.Object.map ~kind ~doc create_obj
59 |> Jsont.Object.mem "url" Jsont.string ~enc:url
60 |> Jsont.Object.opt_mem "doi" Jsont.string ~enc:doi
61 |> Jsont.Object.opt_mem "cito" (Jsont.list Cito.jsont) ~enc:cito
62 |> Jsont.Object.keep_unknown unknown_mems ~enc:unknown
63 |> Jsont.Object.finish