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
|
// fts_language.h
/**
* Copyright (C) 2013 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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.
*/
#pragma once
#include "mongo/base/status_with.h"
#include "mongo/db/fts/fts_basic_phrase_matcher.h"
#include "mongo/db/fts/fts_phrase_matcher.h"
#include "mongo/db/fts/fts_unicode_phrase_matcher.h"
#include "mongo/db/fts/fts_util.h"
#include <string>
namespace mongo {
namespace fts {
class FTSTokenizer;
// Legacy language initialization.
#define MONGO_FTS_LANGUAGE_DECLARE(language, name, version) \
BasicFTSLanguage language; \
MONGO_INITIALIZER_GENERAL(language, MONGO_NO_PREREQUISITES, ("FTSAllLanguagesRegistered")) \
(::mongo::InitializerContext * context) { \
FTSLanguage::registerLanguage(name, version, &language); \
return Status::OK(); \
}
/**
* A FTSLanguage represents a language for a text-indexed document or a text search.
* FTSLanguage objects are not copyable.
*
* Recommended usage:
*
* StatusWithFTSLanguage swl = FTSLanguage::make( "en", TEXT_INDEX_VERSION_3 );
* if ( !swl.getStatus().isOK() ) {
* // Error.
* }
* else {
* const FTSLanguage* language = swl.getValue();
* // Use language.
* }
*/
class FTSLanguage {
// Use make() instead of copying.
MONGO_DISALLOW_COPYING(FTSLanguage);
public:
/** Create an uninitialized language. */
FTSLanguage();
virtual ~FTSLanguage() {}
/**
* Returns the language as a std::string in canonical form (lowercased English name). It is
* an error to call str() on an uninitialized language.
*/
const std::string& str() const;
/**
* Returns a new FTSTokenizer instance for this language.
* Lifetime is scoped to FTSLanguage (which are currently all process lifetime).
*/
virtual std::unique_ptr<FTSTokenizer> createTokenizer() const = 0;
/**
* Returns a reference to the phrase matcher instance that this language owns.
*/
virtual const FTSPhraseMatcher& getPhraseMatcher() const = 0;
/**
* Register std::string 'languageName' as a new language with the text index version
* 'textIndexVersion'. Saves the resulting language to out-argument 'languageOut'.
* Subsequent calls to FTSLanguage::make() will recognize the newly-registered language string.
*/
static void registerLanguage(StringData languageName,
TextIndexVersion textIndexVersion,
FTSLanguage* languageOut);
/**
* Register 'alias' as an alias for 'language' with text index version
* 'textIndexVersion'. Subsequent calls to FTSLanguage::make() will recognize the
* newly-registered alias.
*/
static void registerLanguageAlias(const FTSLanguage* language,
StringData alias,
TextIndexVersion textIndexVersion);
/**
* Return the FTSLanguage associated with the given language string and the given text index
* version. Returns an error Status if an invalid language std::string is passed.
*
* For textIndexVersion >= TEXT_INDEX_VERSION_2, language strings are
* case-insensitive, and need to be in one of the two following forms:
* - English name, like "spanish".
* - Two-letter code, like "es".
*
* For textIndexVersion == TEXT_INDEX_VERSION_1, no validation or normalization of
* language strings is performed. This is necessary to preserve indexing behavior for
* documents with language strings like "en": for compatibility, text data in these
* documents needs to be processed with the English stemmer and the empty stopword list
* (since "en" is recognized by Snowball but not the stopword processing logic).
*/
static StatusWith<const FTSLanguage*> make(StringData langName,
TextIndexVersion textIndexVersion);
private:
// std::string representation of language in canonical form.
std::string _canonicalName;
};
typedef StatusWith<const FTSLanguage*> StatusWithFTSLanguage;
/**
* FTSLanguage implementation that returns a BasicFTSTokenizer and BasicFTSPhraseMatcher for ASCII
* aware case folding in FTS.
*/
class BasicFTSLanguage : public FTSLanguage {
public:
std::unique_ptr<FTSTokenizer> createTokenizer() const final;
const FTSPhraseMatcher& getPhraseMatcher() const final;
private:
BasicFTSPhraseMatcher _basicPhraseMatcher;
};
/**
* FTSLanguage implementation that returns a UnicodeFTSTokenizer and UnicodeFTSPhraseMatcher for
* Unicode aware case folding and diacritic removal in FTS.
*/
class UnicodeFTSLanguage : public FTSLanguage {
public:
UnicodeFTSLanguage(const std::string& languageName) : _unicodePhraseMatcher(languageName) {}
std::unique_ptr<FTSTokenizer> createTokenizer() const final;
const FTSPhraseMatcher& getPhraseMatcher() const final;
private:
UnicodeFTSPhraseMatcher _unicodePhraseMatcher;
};
extern BasicFTSLanguage languagePorterV1;
extern BasicFTSLanguage languageEnglishV2;
extern BasicFTSLanguage languageFrenchV2;
}
}
|
