Implement named data groups.

[erlang-x-plane-data.git] / src / x_plane_data_named.erl

diff --git a/src/x_plane_data_named.erl b/src/x_plane_data_named.erl
new file mode 100644 (file)
index 0000000..250bf80
--- /dev/null
+++ b/src/x_plane_data_named.erl
@@ -0,0 +1,55 @@
+-module(x_plane_data_named).
+
+-export_type(
+    [ t/0
+    , version/0
+    , group/0
+    ]).
+
+-export(
+    [ of_raw/1
+    ]).
+
+-type version() ::
+    x_plane_data_v10.
+
+-type group() ::
+      {speeds            , x_plane_data_group_speeds:t()}
+    | {pitch_roll_heading, x_plane_data_group_pitch_roll_heading:t()}
+    | {lat_lon_alt       , x_plane_data_group_lat_lon_alt:t()}
+    .
+
+-type t() ::
+    {version(), [group()]}.
+
+-define(DATA_INDEX_V10, 64).
+
+-spec of_raw(x_plane_data_raw:t()) ->
+    hope_result:t(t(), unknown_x_plane_version).
+of_raw({?DATA_INDEX_V10, GroupsRaw}) ->
+    ConsKnownDropUnknown =
+        fun (GroupRaw, Groups1) ->
+            GroupOpt = v10_group_identify(GroupRaw),
+            Groups2Opt = hope_option:map(GroupOpt, fun (G) -> [G | Groups1] end),
+            hope_option:get(Groups2Opt, Groups1)
+        end,
+    GroupsNamed = lists:foldl(ConsKnownDropUnknown, [], GroupsRaw),
+    T = {x_plane_data_v10, GroupsNamed},
+    {ok, T};
+of_raw({_, _}) ->
+    {error, unknown_x_plane_version}.
+
+-spec v10_group_identify(x_plane_data_raw:group()) ->
+    hope_option:t(group()).
+v10_group_identify({Index, Values}) ->
+    LabAndConsOpt = v10_index_to_label_and_constructor(Index),
+    hope_option:map(LabAndConsOpt, fun ({L, C}) -> {L, C(Values)} end).
+
+v10_index_to_label_and_constructor(Index) ->
+    F = of_raw_values_v10,
+    case Index
+    of  3  -> {some, {speeds            , fun x_plane_data_group_speeds:F/1}}
+    ;   17 -> {some, {pitch_roll_heading, fun x_plane_data_group_pitch_roll_heading:F/1}}
+    ;   20 -> {some, {lat_lon_alt       , fun x_plane_data_group_lat_lon_alt:F/1}}
+    ;   _ -> none
+    end.