1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/**
* 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 <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"
#include "mongo/util/ctype.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(), [](char a, char b) {
return ctype::toLower(a) < ctype::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
|
