Created
April 12, 2022 03:50
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Naïve string sorter for Russian Cyrillic
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| defmodule RuSorter do | |
| def compare(<<"ё", _::binary>>, <<"ё", _::binary>>), do: :eq | |
| def compare(<<"Ё", _::binary>>, <<"Ё", _::binary>>), do: :eq | |
| def compare(<<"ё", _::binary>>, <<c::utf8, _::binary>>) when c in 1072..1077, do: :gt | |
| def compare(<<c::utf8, _::binary>>, <<"ё", _::binary>>) when c in 1072..1077, do: :lt | |
| def compare(<<"ё", _::binary>>, <<c::utf8, _::binary>>) when c in 1078..1103, do: :lt | |
| def compare(<<c::utf8, _::binary>>, <<"ё", _::binary>>) when c in 1078..1103, do: :gt | |
| def compare(<<"Ё", _::binary>>, <<c::utf8, _::binary>>) when c in 1040..1045, do: :gt | |
| def compare(<<c::utf8, _::binary>>, <<"Ё", _::binary>>) when c in 1040..1045, do: :lt | |
| def compare(<<"Ё", _::binary>>, <<c::utf8, _::binary>>) when c in 1046..1071, do: :lt | |
| def compare(<<c::utf8, _::binary>>, <<"Ё", _::binary>>) when c in 1046..1071, do: :gt | |
| def compare(<<c1::utf8, _::binary>>, <<c2::utf8, _::binary>>) when c1 < c2, do: :lt | |
| def compare(_, _), do: :gt | |
| end | |
| ##################################### | |
| ### TESTS ### | |
| ##################################### | |
| iex|💧|1 ▸ ["ель", "ёж", "яблоко", "железо"] |> Enum.sort(RuSorter) | |
| #⇒ ["ель", "ёж", "железо", "яблоко"] | |
| iex|💧|2 ▸ ["ель", "ёж", "яблоко", "железо"] |> Enum.map(&String.upcase/1) |> Enum.sort(RuSorter) | |
| #⇒ ["ЕЛЬ", "ЁЖ", "ЖЕЛЕЗО", "ЯБЛОКО"] |
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