41 lines
1.4 KiB
Elixir
41 lines
1.4 KiB
Elixir
# 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([]), do: [[]]
|
|
|
|
defp qualification_combinations(["\uFE0F" | tail]) do
|
|
tail
|
|
|> qualification_combinations()
|
|
|> Enum.flat_map(fn x -> [x, ["\uFE0F" | x]] end)
|
|
end
|
|
|
|
defp qualification_combinations([codepoint | tail]) do
|
|
tail
|
|
|> qualification_combinations()
|
|
|> Enum.map(fn x -> [codepoint | x] end)
|
|
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
|