116 lines
4.0 KiB
C++
116 lines
4.0 KiB
C++
//
|
||
// 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/translit.h"
|
||
|
||
#include "td/utils/algorithm.h"
|
||
#include "td/utils/FlatHashMap.h"
|
||
#include "td/utils/misc.h"
|
||
#include "td/utils/utf8.h"
|
||
|
||
#include <algorithm>
|
||
#include <utility>
|
||
|
||
namespace td {
|
||
|
||
static const FlatHashMap<uint32, string> &get_en_to_ru_simple_rules() {
|
||
static const FlatHashMap<uint32, string> rules{
|
||
{'a', "а"}, {'b', "б"}, {'c', "к"}, {'d', "д"}, {'e', "е"}, {'f', "ф"}, {'g', "г"}, {'h', "х"}, {'i', "и"},
|
||
{'j', "й"}, {'k', "к"}, {'l', "л"}, {'m', "м"}, {'n', "н"}, {'o', "о"}, {'p', "п"}, {'q', "к"}, {'r', "р"},
|
||
{'s', "с"}, {'t', "т"}, {'u', "у"}, {'v', "в"}, {'w', "в"}, {'x', "кс"}, {'y', "и"}, {'z', "з"}};
|
||
return rules;
|
||
}
|
||
|
||
static const std::vector<std::pair<string, string>> &get_en_to_ru_complex_rules() {
|
||
static const std::vector<std::pair<string, string>> rules{
|
||
{"ch", "ч"}, {"ei", "ей"}, {"ey", "ей"}, {"ia", "ия"}, {"iy", "ий"}, {"jo", "е"},
|
||
{"ju", "ю"}, {"ja", "я"}, {"kh", "х"}, {"shch", "щ"}, {"sh", "ш"}, {"sch", "щ"},
|
||
{"ts", "ц"}, {"yo", "е"}, {"yu", "ю"}, {"ya", "я"}, {"zh", "ж"}};
|
||
return rules;
|
||
}
|
||
|
||
static const FlatHashMap<uint32, string> &get_ru_to_en_simple_rules() {
|
||
static const FlatHashMap<uint32, string> rules{
|
||
{0x430, "a"}, {0x431, "b"}, {0x432, "v"}, {0x433, "g"}, {0x434, "d"}, {0x435, "e"}, {0x451, "e"},
|
||
{0x436, "zh"}, {0x437, "z"}, {0x438, "i"}, {0x439, "y"}, {0x43a, "k"}, {0x43b, "l"}, {0x43c, "m"},
|
||
{0x43d, "n"}, {0x43e, "o"}, {0x43f, "p"}, {0x440, "r"}, {0x441, "s"}, {0x442, "t"}, {0x443, "u"},
|
||
{0x444, "f"}, {0x445, "kh"}, {0x446, "ts"}, {0x447, "ch"}, {0x448, "sh"}, {0x449, "sch"}, {0x44a, ""},
|
||
{0x44b, "y"}, {0x44c, ""}, {0x44d, "e"}, {0x44e, "yu"}, {0x44f, "ya"}};
|
||
return rules;
|
||
}
|
||
|
||
static const std::vector<std::pair<string, string>> &get_ru_to_en_complex_rules() {
|
||
static const std::vector<std::pair<string, string>> rules{
|
||
{"ий", "y"}, {"ия", "ia"}, {"кс", "x"}, {"yo", "e"}, {"jo", "e"}};
|
||
return rules;
|
||
}
|
||
|
||
static void add_word_transliterations(vector<string> &result, Slice word, bool allow_partial,
|
||
const FlatHashMap<uint32, string> &simple_rules,
|
||
const vector<std::pair<string, string>> &complex_rules) {
|
||
string s;
|
||
auto pos = word.ubegin();
|
||
auto end = word.uend();
|
||
while (pos != end) {
|
||
uint32 code;
|
||
pos = next_utf8_unsafe(pos, &code);
|
||
auto it = simple_rules.find(code);
|
||
if (it != simple_rules.end()) {
|
||
s += it->second;
|
||
} else {
|
||
append_utf8_character(s, code);
|
||
}
|
||
}
|
||
if (!s.empty()) {
|
||
result.push_back(std::move(s));
|
||
s.clear();
|
||
}
|
||
|
||
pos = word.ubegin();
|
||
while (pos != end) {
|
||
auto suffix = Slice(pos, end);
|
||
bool found = false;
|
||
for (auto &rule : complex_rules) {
|
||
if (begins_with(suffix, rule.first)) {
|
||
found = true;
|
||
pos += rule.first.size();
|
||
s.append(rule.second);
|
||
break;
|
||
}
|
||
if (allow_partial && begins_with(rule.first, suffix)) {
|
||
result.push_back(s + rule.second);
|
||
}
|
||
}
|
||
if (found) {
|
||
continue;
|
||
}
|
||
|
||
uint32 code;
|
||
pos = next_utf8_unsafe(pos, &code);
|
||
auto it = simple_rules.find(code);
|
||
if (it != simple_rules.end()) {
|
||
s += it->second;
|
||
} else {
|
||
append_utf8_character(s, code);
|
||
}
|
||
}
|
||
if (!s.empty()) {
|
||
result.push_back(std::move(s));
|
||
}
|
||
}
|
||
|
||
vector<string> get_word_transliterations(Slice word, bool allow_partial) {
|
||
vector<string> result;
|
||
|
||
add_word_transliterations(result, word, allow_partial, get_en_to_ru_simple_rules(), get_en_to_ru_complex_rules());
|
||
add_word_transliterations(result, word, allow_partial, get_ru_to_en_simple_rules(), get_ru_to_en_complex_rules());
|
||
|
||
td::unique(result);
|
||
return result;
|
||
}
|
||
|
||
} // namespace td
|