86 lines
2.4 KiB
C++
86 lines
2.4 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/utils/common.h"
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#include "td/utils/Slice.h"
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#include <map>
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#include <unordered_map>
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#include <utility>
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namespace td {
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// TODO template KeyT
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class Hints {
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using KeyT = int64;
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using RatingT = int64;
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public:
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void add(KeyT key, Slice name);
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void remove(KeyT key) {
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add(key, "");
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}
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void set_rating(KeyT key, RatingT rating);
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std::pair<size_t, vector<KeyT>> search(
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Slice query, int32 limit,
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bool return_all_for_empty_query = false) const; // TODO sort by name instead of sort by rating
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bool has_key(KeyT key) const;
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string key_to_string(KeyT key) const;
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std::pair<size_t, vector<KeyT>> search_empty(int32 limit) const; // == search("", limit, true)
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size_t size() const;
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private:
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std::map<string, vector<KeyT>> word_to_keys_;
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std::map<string, vector<KeyT>> translit_word_to_keys_;
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std::unordered_map<KeyT, string> key_to_name_;
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std::unordered_map<KeyT, RatingT> key_to_rating_;
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static void add_word(const string &word, KeyT key, std::map<string, vector<KeyT>> &word_to_keys);
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static void delete_word(const string &word, KeyT key, std::map<string, vector<KeyT>> &word_to_keys);
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static vector<string> fix_words(vector<string> words);
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static vector<string> get_words(Slice name);
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static void add_search_results(vector<KeyT> &results, const string &word,
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const std::map<string, vector<KeyT>> &word_to_keys);
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vector<KeyT> search_word(const string &word) const;
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class CompareByRating {
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const std::unordered_map<KeyT, RatingT> &key_to_rating_;
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RatingT get_rating(const KeyT &key) const {
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auto it = key_to_rating_.find(key);
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if (it == key_to_rating_.end()) {
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return RatingT();
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}
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return it->second;
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}
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public:
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explicit CompareByRating(const std::unordered_map<KeyT, RatingT> &key_to_rating) : key_to_rating_(key_to_rating) {
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}
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bool operator()(const KeyT &lhs, const KeyT &rhs) const {
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auto lhs_rating = get_rating(lhs);
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auto rhs_rating = get_rating(rhs);
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return lhs_rating < rhs_rating || (lhs_rating == rhs_rating && lhs < rhs);
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}
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};
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};
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} // namespace td
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