tdlight/tdutils/td/utils/emoji.cpp

//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2022
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/utils/emoji.h"

#include "td/utils/base64.h"
#include "td/utils/FlatHashSet.h"
#include "td/utils/Gzip.h"

namespace td {

bool is_emoji(Slice str) {
  constexpr size_t MAX_EMOJI_LENGTH = 35;
  static const FlatHashSet<Slice, SliceHash> emojis = [max_emoji_length = MAX_EMOJI_LENGTH] {
#if TD_HAVE_ZLIB
    Slice packed_emojis(
        "eJyNnety27i2rV8lVfvf-XXul7frVmfZ6cS6kKJskrLj7tUUaUmOI1uObcUEWLUfJecBdledFzgaJIfJiUkyqyqAJ4wxJzE_QABF2fGPs_"
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        "H6vcZKlzt7BdUiHI2QvUbKozq7B-oTlCdovqA6ndUH1F9QnWGaowKoz9DHmeIfFZGRh5nyOMMeZwhjzPkcYY8zpDHGfI4w-"
        "iPs36sLlFdofqM6hrVH6i-oLpDhSzPdqjuUSHfM-R7hnzPkO_ZMyrke4Z8z5Dv2SuqHJVBZVEVx2qM9MdIf4z0x0h_jPTHSH-M9MdIf4z0x0h_"
        "jPTHSH-M9MdIf4z0x0h_jPTHSH-M9MdIf4z0x0h_jPTHSH-M9MdIf4z0x0h_jPTHSH-M9MdIf4z0x3-i-"
        "ieqv1AlqFaoUlQZqhtUa1QbVFtUt6iAbgx0Y6AbA90Y6MZANwa6MdCNgW6MpTIGvzH4jcFvDH5j8BuD3xjoxkA3AboJ0E2AbgJ0E6CbAN0E6CZ"
        "ANwG6CdBNgG4CdBOgmwDdBOgmQDcBugnQTYBuAnQTpD9B-hOkP0H6E6Q_QfoTpD9B-hOkP0H6E6Q_QfoTpD9B-hOkP0H6E6Q_QfoTpD9B-"
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        "Png54OfD34--Png54OfD34--Png54OfD34--Png54OfD34--Png54OfD34--Png54OfD34--Png54OfD34--Png54OfD34--Png54OfD34--"
        "Png54OfD34--Png54OfD34--Png54OfD34--Png54OfD34--Png54OfD34--M3Bbw5-c_Cbg98c_ObgNwe_"
        "OfjNwW8OfnPwm4PfHPzm4DcHvzn4zcFvDn5z8JuD3xz85uA3B785-M3Bbw5-c_Cbg98c_ObgNwe_"
        "OfjNwW8OfnPwm4PfHPzm4DcHvzn4zcFvDn5z8JuD3xz85uA3B785-M3Bbw5-c_Cbg98c_ObgNwe_"
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    static string all_emojis_str = gzdecode(base64url_decode(packed_emojis).ok()).as_slice().str();
    constexpr size_t EMOJI_COUNT = 4682;
#else
    string all_emojis_str;
    constexpr size_t EMOJI_COUNT = 0;
#endif
    FlatHashSet<Slice, SliceHash> all_emojis;
    all_emojis.reserve(EMOJI_COUNT);
    for (size_t i = 0; i < all_emojis_str.size(); i++) {
      CHECK(all_emojis_str[i] != ' ');
      CHECK(all_emojis_str[i + 1] != ' ');
      size_t j = i + 2;
      while (j < all_emojis_str.size() && all_emojis_str[j] != ' ') {
        j++;
      }
      CHECK(j < all_emojis_str.size());
      all_emojis.insert(Slice(&all_emojis_str[i], &all_emojis_str[j]));
      CHECK(j - i <= max_emoji_length);
      i = j;
    }
    CHECK(all_emojis.size() == EMOJI_COUNT);
    return all_emojis;
  }();
  if (str.size() > MAX_EMOJI_LENGTH) {
    return false;
  }
  return emojis.count(str) != 0;
}

int get_fitzpatrick_modifier(Slice emoji) {
  if (emoji.size() < 4 || emoji[emoji.size() - 4] != '\xF0' || emoji[emoji.size() - 3] != '\x9F' ||
      emoji[emoji.size() - 2] != '\x8F') {
    return 0;
  }
  auto c = static_cast<unsigned char>(emoji.back());
  if (c < 0xBB || c > 0xBF) {
    return 0;
  }
  return (c - 0xBB) + 2;
}

Slice remove_fitzpatrick_modifier(Slice emoji) {
  while (get_fitzpatrick_modifier(emoji) != 0) {
    emoji.remove_suffix(4);
  }
  return emoji;
}

string remove_emoji_modifiers(Slice emoji) {
  string result = emoji.str();
  remove_emoji_modifiers_in_place(result);
  return result;
}

void remove_emoji_modifiers_in_place(string &emoji) {
  static const Slice modifiers[] = {u8"\uFE0F" /* variation selector-16 */,
                                    u8"\u200D\u2640" /* zero width joiner + female sign */,
                                    u8"\u200D\u2642" /* zero width joiner + male sign */,
                                    u8"\U0001F3FB" /* emoji modifier fitzpatrick type-1-2 */,
                                    u8"\U0001F3FC" /* emoji modifier fitzpatrick type-3 */,
                                    u8"\U0001F3FD" /* emoji modifier fitzpatrick type-4 */,
                                    u8"\U0001F3FE" /* emoji modifier fitzpatrick type-5 */,
                                    u8"\U0001F3FF" /* emoji modifier fitzpatrick type-6 */};
  size_t j = 0;
  for (size_t i = 0; i < emoji.size();) {
    bool is_found = false;
    for (auto &modifier : modifiers) {
      auto length = modifier.size();
      if (i + length <= emoji.size() && Slice(&emoji[i], length) == modifier) {
        // skip modifier
        i += length;
        is_found = true;
        break;
      }
    }
    if (!is_found) {
      emoji[j++] = emoji[i++];
    }
  }
  emoji.resize(j);
}

string remove_emoji_selectors(Slice emoji) {
  if (!is_emoji(emoji)) {
    return emoji.str();
  }
  string str;
  for (size_t i = 0; i < emoji.size(); i++) {
    if (i + 3 <= emoji.size() && emoji[i] == '\xEF' && emoji[i + 1] == '\xB8' && emoji[i + 2] == '\x8F') {
      // skip \uFE0F
      i += 2;
    } else {
      str += emoji[i];
    }
  }
  CHECK(is_emoji(str));
  return str;
}

}  // namespace td