native runtime: add array fns

CHANGES.md

@@ -21,6 +21,8 @@
   ([#33](https://github.com/melange-community/melange-json/pull/33))
 - PPX: remove `string_to_json` usage on js side
   ([#35](https://github.com/melange-community/melange-json/pull/35))
+- PPX: Add array functions to native runtime
+  ([#37](https://github.com/melange-community/melange-json/pull/37))
 
 ## 1.3.0 (2024-08-28)
 

ppx/native/ppx_deriving_json_runtime.ml

@@ -37,6 +37,9 @@ module To_json = struct
   let unit_to_json () = `Null
   let list_to_json v_to_json vs = `List (List.map v_to_json vs)
 
+  let array_to_json v_to_json vs =
+    `List (Array.to_list (Array.map v_to_json vs))
+
   let option_to_json v_to_json = function
     | None -> `Null
     | Some v -> v_to_json v
@@ -93,6 +96,10 @@ module Of_json = struct
     | `List l -> List.map v_of_json l
     | json -> of_json_error_type_mismatch json "array"
 
+  let array_of_json v_of_json = function
+    | `List l -> Array.map v_of_json (Array.of_list l)
+    | json -> of_json_error_type_mismatch json "array"
+
   let result_of_json ok_of_json err_of_json json =
     match json with
     | `List [ `String "Ok"; x ] -> Ok (ok_of_json x)

ppx/test/example.ml

@@ -21,6 +21,7 @@ type ('a, 'b) p2 = A of 'a | B of 'b [@@deriving json]
 type allow_extra_fields = {a: int} [@@deriving json] [@@json.allow_extra_fields]
 type allow_extra_fields2 = A of {a: int} [@json.allow_extra_fields] [@@deriving json]
 type drop_default_option = { a: int; b_opt: int option; [@option] [@json.drop_default] } [@@deriving json]
+type array_list = { a: int array; b: int list} [@@deriving json]
 
 type json = Ppx_deriving_json_runtime.t
 type of_json = C : string * (json -> 'a) * ('a -> json) * 'a -> of_json
@@ -55,6 +56,7 @@ let of_json_cases = [
   C ({|["A",{"a":1,"b":2}]|}, allow_extra_fields2_of_json, allow_extra_fields2_to_json, A {a=1});
   C ({|{"a":1}|}, drop_default_option_of_json, drop_default_option_to_json, {a=1; b_opt=None});
   C ({|{"a":1,"b_opt":2}|}, drop_default_option_of_json, drop_default_option_to_json, {a=1; b_opt=Some 2});
+  C ({|{"a":[1],"b":[2]}|}, array_list_of_json, array_list_to_json, {a=[|1|]; b=[2]});
 ]
 let run' (C (data, of_json, to_json, v)) =
   print_endline (Printf.sprintf "JSON    DATA: %s" data);

ppx/test/ppx_deriving_json_js.e2e.t

@@ -87,6 +87,8 @@
   JSON REPRINT: {"a":1}
   JSON    DATA: {"a":1,"b_opt":2}
   JSON REPRINT: {"a":1,"b_opt":2}
+  JSON    DATA: {"a":[1],"b":[2]}
+  JSON REPRINT: {"a":[1],"b":[2]}
   *** json_string deriver tests ***
   ** To_json_string **
   A 42 -> ["A",42]

ppx/test/ppx_deriving_json_native.e2e.t

@@ -77,6 +77,8 @@
   JSON REPRINT: {"a":1}
   JSON    DATA: {"a":1,"b_opt":2}
   JSON REPRINT: {"a":1,"b_opt":2}
+  JSON    DATA: {"a":[1],"b":[2]}
+  JSON REPRINT: {"a":[1],"b":[2]}
   *** json_string deriver tests ***
   ** To_json_string **
   A 42 -> ["A",42]