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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// 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/Hints.h"
#include "td/utils/logging.h"
#include "td/utils/misc.h"
#include "td/utils/Slice.h"
#include "td/utils/unicode.h"
#include "td/utils/utf8.h"
#include <algorithm>
namespace td {
vector<string> Hints::get_words(Slice name) {
bool in_word = false;
string word;
vector<string> words;
auto pos = name.ubegin();
auto end = name.uend();
while (pos != end) {
uint32 code;
pos = next_utf8_unsafe(pos, &code);
code = prepare_search_character(code);
if (code == 0) {
continue;
}
if (code == ' ') {
if (in_word) {
words.push_back(std::move(word));
word.clear();
in_word = false;
}
} else {
in_word = true;
append_utf8_character(word, code);
}
}
if (in_word) {
words.push_back(std::move(word));
}
std::sort(words.begin(), words.end());
size_t new_words_size = 0;
for (size_t i = 0; i != words.size(); i++) {
if (i == words.size() - 1 || !begins_with(words[i + 1], words[i])) {
if (i != new_words_size) {
words[new_words_size] = std::move(words[i]);
}
// LOG(ERROR) << "Get word " << words[new_words_size];
new_words_size++;
}
}
words.resize(new_words_size);
return words;
}
void Hints::add(KeyT key, Slice name) {
// LOG(ERROR) << "Add " << key << ": " << name;
auto it = key_to_name_.find(key);
if (it != key_to_name_.end()) {
if (it->second == name) {
return;
}
auto old_words = get_words(it->second);
for (auto &old_word : old_words) {
vector<KeyT> &keys = word_to_keys_[old_word];
auto key_it = std::find(keys.begin(), keys.end(), key);
CHECK(key_it != keys.end());
if (keys.size() == 1) {
word_to_keys_.erase(old_word);
} else {
CHECK(keys.size() > 1);
*key_it = keys.back();
keys.pop_back();
}
}
}
if (name.empty()) {
if (it != key_to_name_.end()) {
key_to_name_.erase(it);
}
key_to_rating_.erase(key);
return;
}
auto words = get_words(name);
for (auto &word : words) {
vector<KeyT> &keys = word_to_keys_[word];
CHECK(std::find(keys.begin(), keys.end(), key) == keys.end());
keys.push_back(key);
}
key_to_name_[key] = name.str();
}
void Hints::set_rating(KeyT key, RatingT rating) {
// LOG(ERROR) << "Set rating " << key << ": " << rating;
key_to_rating_[key] = rating;
}
vector<Hints::KeyT> Hints::search_word(const string &word) const {
// LOG(ERROR) << "Search word " << word;
vector<KeyT> results;
auto it = word_to_keys_.lower_bound(word);
while (it != word_to_keys_.end() && begins_with(it->first, word)) {
results.insert(results.end(), it->second.begin(), it->second.end());
++it;
}
std::sort(results.begin(), results.end());
results.erase(std::unique(results.begin(), results.end()), results.end());
return results;
}
std::pair<size_t, vector<Hints::KeyT>> Hints::search(Slice query, int32 limit, bool return_all_for_empty_query) const {
// LOG(ERROR) << "Search " << query;
vector<KeyT> results;
if (limit < 0) {
return {key_to_name_.size(), std::move(results)};
}
auto words = get_words(query);
if (return_all_for_empty_query && words.empty()) {
results.reserve(key_to_name_.size());
for (auto &it : key_to_name_) {
results.push_back(it.first);
}
}
for (size_t i = 0; i < words.size(); i++) {
vector<KeyT> keys = search_word(words[i]);
if (i == 0) {
results = std::move(keys);
continue;
}
// now need to intersect two lists
size_t results_pos = 0;
size_t keys_pos = 0;
size_t new_results_size = 0;
while (results_pos != results.size() && keys_pos != keys.size()) {
if (results[results_pos] < keys[keys_pos]) {
results_pos++;
} else if (results[results_pos] > keys[keys_pos]) {
keys_pos++;
} else {
results[new_results_size++] = results[results_pos];
results_pos++;
keys_pos++;
}
}
results.resize(new_results_size);
}
auto total_size = results.size();
if (total_size < static_cast<size_t>(limit)) {
std::sort(results.begin(), results.end(), CompareByRating(key_to_rating_));
} else {
std::partial_sort(results.begin(), results.begin() + limit, results.end(), CompareByRating(key_to_rating_));
results.resize(limit);
}
return {total_size, std::move(results)};
}
bool Hints::has_key(KeyT key) const {
return key_to_name_.find(key) != key_to_name_.end();
}
string Hints::key_to_string(KeyT key) const {
auto it = key_to_name_.find(key);
if (it == key_to_name_.end()) {
return string();
}
return it->second;
}
std::pair<size_t, vector<Hints::KeyT>> Hints::search_empty(int32 limit) const {
return search(Slice(), limit, true);
}
size_t Hints::size() const {
return key_to_name_.size();
}
} // namespace td
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