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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/fts/fts_language.h"
#include <algorithm>
#include <cctype>
#include <fmt/format.h>
#include <map>
#include <memory>
#include <string>
#include <type_traits>
#include <utility>
#include "mongo/base/error_codes.h"
#include "mongo/base/string_data.h"
#include "mongo/db/fts/fts_basic_phrase_matcher.h"
#include "mongo/db/fts/fts_basic_tokenizer.h"
#include "mongo/db/fts/fts_unicode_phrase_matcher.h"
#include "mongo/db/fts/fts_unicode_tokenizer.h"
#include "mongo/util/assert_util.h"
namespace mongo::fts {
namespace {
using namespace fmt::literals;
/**
* Case-insensitive StringData comparator.
* Returns true if a < b.
*/
struct LanguageStringCompare {
bool operator()(StringData a, StringData b) const {
return std::lexicographical_compare(
a.begin(), a.end(), b.begin(), b.end(), [](unsigned char a, unsigned char b) {
return std::tolower(a) < std::tolower(b);
});
}
};
// FTS Language map. These languages are available with TEXT_INDEX_VERSION_2 and above.
//
// Parameters:
// - C++ unique identifier suffix
// - lower case string name
// - language alias
//
struct {
StringData name; // - lower case string name
StringData alias; // - language alias (if nonempty)
} static constexpr kLanguagesV2V3[] = {
{"none"_sd, {}},
{"danish"_sd, "da"_sd},
{"dutch"_sd, "nl"_sd},
{"english"_sd, "en"_sd},
{"finnish"_sd, "fi"_sd},
{"french"_sd, "fr"_sd},
{"german"_sd, "de"_sd},
{"hungarian"_sd, "hu"_sd},
{"italian"_sd, "it"_sd},
{"norwegian"_sd, "nb"_sd},
{"portuguese"_sd, "pt"_sd},
{"romanian"_sd, "ro"_sd},
{"russian"_sd, "ru"_sd},
{"spanish"_sd, "es"_sd},
{"swedish"_sd, "sv"_sd},
{"turkish"_sd, "tr"_sd},
};
//
// Register all Snowball language modules for TEXT_INDEX_VERSION_1. Note that only the full
// names are recognized by the StopWords class (as such, the language string "dan" in
// TEXT_INDEX_VERSION_1 will generate the Danish stemmer and the empty stopword list).
//
struct {
StringData name;
} static constexpr kLanguagesV1[] = {
{"none"_sd}, {"da"_sd}, {"dan"_sd}, {"danish"_sd}, {"de"_sd},
{"deu"_sd}, {"dut"_sd}, {"dutch"_sd}, {"en"_sd}, {"eng"_sd},
{"english"_sd}, {"es"_sd}, {"esl"_sd}, {"fi"_sd}, {"fin"_sd},
{"finnish"_sd}, {"fr"_sd}, {"fra"_sd}, {"fre"_sd}, {"french"_sd},
{"ger"_sd}, {"german"_sd}, {"hu"_sd}, {"hun"_sd}, {"hungarian"_sd},
{"it"_sd}, {"ita"_sd}, {"italian"_sd}, {"nl"_sd}, {"nld"_sd},
{"no"_sd}, {"nor"_sd}, {"norwegian"_sd}, {"por"_sd}, {"porter"_sd},
{"portuguese"_sd}, {"pt"_sd}, {"ro"_sd}, {"romanian"_sd}, {"ron"_sd},
{"ru"_sd}, {"rum"_sd}, {"rus"_sd}, {"russian"_sd}, {"spa"_sd},
{"spanish"_sd}, {"sv"_sd}, {"swe"_sd}, {"swedish"_sd}, {"tr"_sd},
{"tur"_sd}, {"turkish"_sd},
};
template <TextIndexVersion ver>
class LanguageRegistry {
public:
// For V3 and above, use UnicodeFTSLanguage.
using LanguageType =
std::conditional_t<(ver >= TEXT_INDEX_VERSION_3), UnicodeFTSLanguage, BasicFTSLanguage>;
// For V2 and above, language names are case-insensitive.
using KeyCompare =
std::conditional_t<(ver >= TEXT_INDEX_VERSION_2), LanguageStringCompare, std::less<>>;
void add(StringData name, StringData alias = {}) {
auto p = std::make_shared<const LanguageType>(std::string{name});
_map[name.toString()] = p;
if (!alias.empty()) {
_map[alias.toString()] = p;
}
}
const LanguageType& make(StringData langName) const {
std::string nameStr{langName};
auto it = _map.find(nameStr);
if (it == _map.end()) {
if constexpr (ver == TEXT_INDEX_VERSION_1) {
// v1 treats unrecognized language strings as "none".
return *_map.at("none");
} else {
// v2 and above reject unrecognized language strings.
uasserted(ErrorCodes::BadValue,
R"(unsupported language: "{}" for text index version {})"_format(langName,
ver));
}
}
return *it->second;
}
private:
std::map<std::string, std::shared_ptr<const LanguageType>, KeyCompare> _map;
};
// template <TextIndexVersion ver>
// LanguageRegistry<ver> languageRegistry;
template <TextIndexVersion ver>
const LanguageRegistry<ver>& getLanguageRegistry() {
static const auto instance = [] {
auto registry = new LanguageRegistry<ver>;
if constexpr (ver == TEXT_INDEX_VERSION_1) {
for (auto&& spec : kLanguagesV1) {
registry->add(spec.name);
}
} else if constexpr (ver == TEXT_INDEX_VERSION_2 || ver == TEXT_INDEX_VERSION_3) {
for (auto&& spec : kLanguagesV2V3) {
registry->add(spec.name, spec.alias);
}
}
return registry;
}();
return *instance;
}
} // namespace
const FTSLanguage& FTSLanguage::make(StringData langName, TextIndexVersion textIndexVersion) {
switch (textIndexVersion) {
case TEXT_INDEX_VERSION_1:
return getLanguageRegistry<TEXT_INDEX_VERSION_1>().make(langName);
case TEXT_INDEX_VERSION_2:
return getLanguageRegistry<TEXT_INDEX_VERSION_2>().make(langName);
case TEXT_INDEX_VERSION_3:
return getLanguageRegistry<TEXT_INDEX_VERSION_3>().make(langName);
case TEXT_INDEX_VERSION_INVALID:
break;
}
uasserted(ErrorCodes::BadValue, "invalid TextIndexVersion");
}
std::unique_ptr<FTSTokenizer> BasicFTSLanguage::createTokenizer() const {
return std::make_unique<BasicFTSTokenizer>(this);
}
std::unique_ptr<FTSTokenizer> UnicodeFTSLanguage::createTokenizer() const {
return std::make_unique<UnicodeFTSTokenizer>(this);
}
} // namespace mongo::fts
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