combinations.ex (1605B)
- # Pleroma: A lightweight social networking server
- # Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
- # SPDX-License-Identifier: AGPL-3.0-only
- defmodule Pleroma.Emoji.Combinations do
- # FE0F is the emoji variation sequence. It is used for fully-qualifying
- # emoji, and that includes emoji combinations.
- # This code generates combinations per emoji: for each FE0F, all possible
- # combinations of the character being removed or staying will be generated.
- # This is made as an attempt to find all partially-qualified and unqualified
- # versions of a fully-qualified emoji.
- # I have found *no cases* for which this would be a problem, after browsing
- # the entire emoji list in emoji-test.txt. This is safe, and, sadly, most
- # likely sane too.
- defp qualification_combinations(codepoints) do
- qualification_combinations([[]], codepoints)
- end
- defp qualification_combinations(acc, []), do: acc
- defp qualification_combinations(acc, ["\uFE0F" | tail]) do
- acc
- |> Enum.flat_map(fn x -> [x, x ++ ["\uFE0F"]] end)
- |> qualification_combinations(tail)
- end
- defp qualification_combinations(acc, [codepoint | tail]) do
- acc
- |> Enum.map(&Kernel.++(&1, [codepoint]))
- |> qualification_combinations(tail)
- end
- def variate_emoji_qualification(emoji) when is_binary(emoji) do
- emoji
- |> String.codepoints()
- |> qualification_combinations()
- |> Enum.map(&List.to_string/1)
- end
- def variate_emoji_qualification(emoji) when is_list(emoji) do
- emoji
- |> Enum.map(fn emoji -> {emoji, variate_emoji_qualification(emoji)} end)
- end
- end