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%% Copyright (c) 2022 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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-module(mcd_re). |
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-export([run/1]). |
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run(#{subject := Subject, re := RE} = Arg) -> |
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{ok, MP} = re:compile(RE), |
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{namelist, NL} = re:inspect(MP, namelist), |
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case re:run( |
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Subject, |
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MP, |
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options(Arg)) of |
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{match, Matches} -> |
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maps:filtermap( |
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mapper(Arg), |
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initial(NL, Matches, Arg)); |
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nomatch -> |
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:-( |
error(client_error) |
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end. |
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initial(NL, Matches, Arg) -> |
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maps:merge( |
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maps:get(acc0, Arg, maps:with([command, meta], Arg)), |
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maps:from_list( |
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lists:zip([binary_to_existing_atom(N) || N <- NL], Matches))). |
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mapper(#{mapping := Mapping}) -> |
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fun |
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(K, V) -> |
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case maps:find(K, Mapping) of |
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{ok, Mapper} -> |
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case erlang:fun_info(Mapper, arity) of |
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{arity, 1} -> |
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{true, Mapper(V)}; |
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{arity, 2} -> |
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Mapper(K, V) |
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end; |
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error -> |
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{true, V} |
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end |
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end; |
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mapper(_) -> |
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:-( |
fun |
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(_, V) -> |
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:-( |
{true, V} |
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end. |
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options(#{options := Options}) -> |
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:-( |
Options; |
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options(#{}) -> |
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[{capture, all_names, binary}]. |