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%% Copyright (c) 2023 Peter Morgan <peter.james.morgan@gmail.com> |
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%% |
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%% Licensed under the Apache License, Version 2.0 (the "License"); |
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%% you may not use this file except in compliance with the License. |
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%% You may obtain a copy of the License at |
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%% |
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%% http://www.apache.org/licenses/LICENSE-2.0 |
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%% |
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%% Unless required by applicable law or agreed to in writing, software |
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%% distributed under the License is distributed on an "AS IS" BASIS, |
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%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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%% See the License for the specific language governing permissions and |
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%% limitations under the License. |
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%% @doc Encoder combinators. |
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-module(narcs_combinator). |
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-export([condition/2]). |
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-export([map_result/2]). |
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-export([rest/0]). |
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-export([v/2]). |
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-include_lib("kernel/include/logger.hrl"). |
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%% @doc Map the result of the supplied encoder. |
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map_result(Encoder, Mapping) -> |
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fun |
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(Decoded) -> |
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(Mapping(Encoder(Decoded))) |
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end. |
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%% @doc Apply the encoder if the condition is true. |
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-type condition() :: boolean() |
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| atom(). |
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-spec condition(condition(), narcs:encoder()) -> narcs:encoder(). |
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condition(true, Encoder) -> |
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:-( |
fun |
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(Decoded) -> |
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:-( |
(Encoder)(Decoded) |
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end; |
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condition(false, _) -> |
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:-( |
fun |
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(_) -> |
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:-( |
<<>> |
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end; |
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condition(Key, Encoder) -> |
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fun |
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(#{Key := true} = Decoded) -> |
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(Encoder)(Decoded); |
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(#{Key := false}) -> |
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<<>>; |
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(_) -> |
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:-( |
error(badarg, [Key, Encoder]) |
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end. |
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%% @doc Apply an encoder on the value represented by the supplied key. |
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-spec v(any(), narcs:encoder()) -> narcs:encoder(map(), narcs:output()). |
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v(Key, Encoder) -> |
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fun |
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(#{Key := Value} = Decoded) -> |
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?LOG_DEBUG(#{key => Key, value => Value, decoded => Decoded}), |
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Encoder(Value); |
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(_) -> |
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:-( |
error(badarg, [Key, Encoder]) |
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end. |
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%% @doc Use the rest of the output as is. |
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-spec rest() -> narcs:encoder(). |
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rest() -> |
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:-( |
fun |
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(Decoded) -> |
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:-( |
Decoded |
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end. |