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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 that deal with branches. |
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-module(narcs_branch). |
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-export([alt/1]). |
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-spec alt([narcs:encoder()]) -> narcs:encoder(). |
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%% @doc Try each alternative encoder until one returns other than |
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%% nomatch. |
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alt(Alternatives) -> |
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fun |
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(Decoded) -> |
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?FUNCTION_NAME(Alternatives, Decoded) |
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end. |
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alt([Alternative | Alternatives], Decoded) -> |
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:-( |
case Alternative(Decoded) of |
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nomatch -> |
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?FUNCTION_NAME(Alternatives, Decoded); |
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Otherwise -> |
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:-( |
Otherwise |
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end; |
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alt([], _) -> |
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nomatch. |