tdlight/tdutils/td/utils/emoji.cpp

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2021-09-20 21:30:23 +02:00
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2023
2021-09-20 21:30:23 +02:00
//
// 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"
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#include "td/utils/FlatHashSet.h"
#include "td/utils/Gzip.h"
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namespace td {
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static constexpr size_t MAX_EMOJI_LENGTH = 28;
static bool is_emoji_element(Slice str) {
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static const FlatHashSet<Slice, SliceHash> emojis = [max_emoji_length = MAX_EMOJI_LENGTH] {
#if TD_HAVE_ZLIB
Slice packed_emojis(
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static string all_emojis_str = gzdecode(base64url_decode(packed_emojis).ok()).as_slice().str();
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constexpr size_t EMOJI_COUNT = 2326;
#else
string all_emojis_str;
constexpr size_t EMOJI_COUNT = 0;
#endif
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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]));
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CHECK(j - i <= max_emoji_length);
i = j;
}
CHECK(all_emojis.size() == EMOJI_COUNT);
return all_emojis;
}();
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auto len = str.size();
if (len > MAX_EMOJI_LENGTH + 3) {
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return false;
}
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if (emojis.count(str) != 0) {
return true;
}
if (len <= 3 || str[len - 3] != '\xEF' || str[len - 2] != '\xB8' || str[len - 1] != '\x8F') {
return false;
}
if (len >= 6 && str[len - 6] == '\xEF' && str[len - 5] == '\xB8' && str[len - 4] == '\x8F') {
return false;
}
return emojis.count(str.substr(0, len - 3)) != 0;
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}
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bool is_emoji(Slice str) {
size_t i = str.substr(0, MAX_EMOJI_LENGTH + 4).find('\xE2');
if (i == td::Slice::npos) {
return is_emoji_element(str);
}
size_t start_pos = 0;
for (; i + 3 < str.size(); i++) {
if (str[i] == '\xE2' && str[i + 1] == '\x80' && str[i + 2] == '\x8D') {
// zero-width joiner \u200D
if (!is_emoji_element(str.substr(start_pos, i - start_pos))) {
return false;
}
start_pos = i + 3;
i += 2;
}
}
return is_emoji_element(str.substr(start_pos));
}
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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;
}
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Slice remove_fitzpatrick_modifier(Slice emoji) {
while (get_fitzpatrick_modifier(emoji) != 0) {
emoji.remove_suffix(4);
}
return emoji;
}
string remove_emoji_modifiers(Slice emoji, bool remove_selectors) {
string result = emoji.str();
remove_emoji_modifiers_in_place(result, remove_selectors);
return result;
}
void remove_emoji_modifiers_in_place(string &emoji, bool remove_selectors) {
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 */};
const size_t start_index = remove_selectors ? 0 : 1;
size_t j = 0;
for (size_t i = 0; i < emoji.size();) {
bool is_found = false;
for (size_t k = start_index; k < sizeof(modifiers) / sizeof(*modifiers); k++) {
auto length = modifiers[k].size();
if (i + length <= emoji.size() && Slice(&emoji[i], length) == modifiers[k]) {
// skip the modifier
i += length;
is_found = true;
break;
}
}
if (!is_found) {
emoji[j++] = emoji[i++];
}
}
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if (j != 0) {
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;
}
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} // namespace td