45 lines
1.6 KiB
Elixir
45 lines
1.6 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Emoji.Combinations do
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# FE0F is the emoji variation sequence. It is used for fully-qualifying
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# emoji, and that includes emoji combinations.
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# This code generates combinations per emoji: for each FE0F, all possible
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# combinations of the character being removed or staying will be generated.
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# This is made as an attempt to find all partially-qualified and unqualified
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# versions of a fully-qualified emoji.
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# I have found *no cases* for which this would be a problem, after browsing
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# the entire emoji list in emoji-test.txt. This is safe, and, sadly, most
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# likely sane too.
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defp qualification_combinations(codepoints) do
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qualification_combinations([[]], codepoints)
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end
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defp qualification_combinations(acc, []), do: acc
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defp qualification_combinations(acc, ["\uFE0F" | tail]) do
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acc
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|> Enum.flat_map(fn x -> [x, x ++ ["\uFE0F"]] end)
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|> qualification_combinations(tail)
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end
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defp qualification_combinations(acc, [codepoint | tail]) do
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acc
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|> Enum.map(&Kernel.++(&1, [codepoint]))
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|> qualification_combinations(tail)
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end
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def variate_emoji_qualification(emoji) when is_binary(emoji) do
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emoji
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|> String.codepoints()
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|> qualification_combinations()
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|> Enum.map(&List.to_string/1)
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end
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def variate_emoji_qualification(emoji) when is_list(emoji) do
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emoji
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|> Enum.map(fn emoji -> {emoji, variate_emoji_qualification(emoji)} end)
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end
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end
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