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comparison: storage/src/SQLCollations.cpp

storage/src/SQLCollations.cpp

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1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2 * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
3 * This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7 #include "mozilla/ArrayUtils.h"
8
9 #include "SQLCollations.h"
10
11 namespace mozilla {
12 namespace storage {
13
14 ////////////////////////////////////////////////////////////////////////////////
15 //// Local Helper Functions
16
17 namespace {
18
19 /**
20 * Helper function for the UTF-8 locale collations.
21 *
22 * @param aService
23 * The Service that owns the nsICollation used by this collation.
24 * @param aLen1
25 * The number of bytes in aStr1.
26 * @param aStr1
27 * The string to be compared against aStr2 as provided by SQLite. It
28 * must be a non-null-terminated char* buffer.
29 * @param aLen2
30 * The number of bytes in aStr2.
31 * @param aStr2
32 * The string to be compared against aStr1 as provided by SQLite. It
33 * must be a non-null-terminated char* buffer.
34 * @param aComparisonStrength
35 * The sorting strength, one of the nsICollation constants.
36 * @return aStr1 - aStr2. That is, if aStr1 < aStr2, returns a negative number.
37 * If aStr1 > aStr2, returns a positive number. If aStr1 == aStr2,
38 * returns 0.
39 */
40 int
41 localeCollationHelper8(void *aService,
42 int aLen1,
43 const void *aStr1,
44 int aLen2,
45 const void *aStr2,
46 int32_t aComparisonStrength)
47 {
48 NS_ConvertUTF8toUTF16 str1(static_cast<const char *>(aStr1), aLen1);
49 NS_ConvertUTF8toUTF16 str2(static_cast<const char *>(aStr2), aLen2);
50 Service *serv = static_cast<Service *>(aService);
51 return serv->localeCompareStrings(str1, str2, aComparisonStrength);
52 }
53
54 /**
55 * Helper function for the UTF-16 locale collations.
56 *
57 * @param aService
58 * The Service that owns the nsICollation used by this collation.
59 * @param aLen1
60 * The number of bytes (not characters) in aStr1.
61 * @param aStr1
62 * The string to be compared against aStr2 as provided by SQLite. It
63 * must be a non-null-terminated char16_t* buffer.
64 * @param aLen2
65 * The number of bytes (not characters) in aStr2.
66 * @param aStr2
67 * The string to be compared against aStr1 as provided by SQLite. It
68 * must be a non-null-terminated char16_t* buffer.
69 * @param aComparisonStrength
70 * The sorting strength, one of the nsICollation constants.
71 * @return aStr1 - aStr2. That is, if aStr1 < aStr2, returns a negative number.
72 * If aStr1 > aStr2, returns a positive number. If aStr1 == aStr2,
73 * returns 0.
74 */
75 int
76 localeCollationHelper16(void *aService,
77 int aLen1,
78 const void *aStr1,
79 int aLen2,
80 const void *aStr2,
81 int32_t aComparisonStrength)
82 {
83 const char16_t *buf1 = static_cast<const char16_t *>(aStr1);
84 const char16_t *buf2 = static_cast<const char16_t *>(aStr2);
85
86 // The second argument to the nsDependentSubstring constructor is exclusive:
87 // It points to the char16_t immediately following the last one in the target
88 // substring. Since aLen1 and aLen2 are in bytes, divide by sizeof(char16_t)
89 // so that the pointer arithmetic is correct.
90 nsDependentSubstring str1(buf1, buf1 + (aLen1 / sizeof(char16_t)));
91 nsDependentSubstring str2(buf2, buf2 + (aLen2 / sizeof(char16_t)));
92 Service *serv = static_cast<Service *>(aService);
93 return serv->localeCompareStrings(str1, str2, aComparisonStrength);
94 }
95
96 // This struct is used only by registerCollations below, but ISO C++98 forbids
97 // instantiating a template dependent on a locally-defined type. Boo-urns!
98 struct Collations {
99 const char *zName;
100 int enc;
101 int(*xCompare)(void*, int, const void*, int, const void*);
102 };
103
104 } // anonymous namespace
105
106 ////////////////////////////////////////////////////////////////////////////////
107 //// Exposed Functions
108
109 int
110 registerCollations(sqlite3 *aDB,
111 Service *aService)
112 {
113 Collations collations[] = {
114 {"locale",
115 SQLITE_UTF8,
116 localeCollation8},
117 {"locale_case_sensitive",
118 SQLITE_UTF8,
119 localeCollationCaseSensitive8},
120 {"locale_accent_sensitive",
121 SQLITE_UTF8,
122 localeCollationAccentSensitive8},
123 {"locale_case_accent_sensitive",
124 SQLITE_UTF8,
125 localeCollationCaseAccentSensitive8},
126 {"locale",
127 SQLITE_UTF16,
128 localeCollation16},
129 {"locale_case_sensitive",
130 SQLITE_UTF16,
131 localeCollationCaseSensitive16},
132 {"locale_accent_sensitive",
133 SQLITE_UTF16,
134 localeCollationAccentSensitive16},
135 {"locale_case_accent_sensitive",
136 SQLITE_UTF16,
137 localeCollationCaseAccentSensitive16},
138 };
139
140 int rv = SQLITE_OK;
141 for (size_t i = 0; SQLITE_OK == rv && i < ArrayLength(collations); ++i) {
142 struct Collations *p = &collations[i];
143 rv = ::sqlite3_create_collation(aDB, p->zName, p->enc, aService,
144 p->xCompare);
145 }
146
147 return rv;
148 }
149
150 ////////////////////////////////////////////////////////////////////////////////
151 //// SQL Collations
152
153 int
154 localeCollation8(void *aService,
155 int aLen1,
156 const void *aStr1,
157 int aLen2,
158 const void *aStr2)
159 {
160 return localeCollationHelper8(aService, aLen1, aStr1, aLen2, aStr2,
161 nsICollation::kCollationCaseInSensitive);
162 }
163
164 int
165 localeCollationCaseSensitive8(void *aService,
166 int aLen1,
167 const void *aStr1,
168 int aLen2,
169 const void *aStr2)
170 {
171 return localeCollationHelper8(aService, aLen1, aStr1, aLen2, aStr2,
172 nsICollation::kCollationAccentInsenstive);
173 }
174
175 int
176 localeCollationAccentSensitive8(void *aService,
177 int aLen1,
178 const void *aStr1,
179 int aLen2,
180 const void *aStr2)
181 {
182 return localeCollationHelper8(aService, aLen1, aStr1, aLen2, aStr2,
183 nsICollation::kCollationCaseInsensitiveAscii);
184 }
185
186 int
187 localeCollationCaseAccentSensitive8(void *aService,
188 int aLen1,
189 const void *aStr1,
190 int aLen2,
191 const void *aStr2)
192 {
193 return localeCollationHelper8(aService, aLen1, aStr1, aLen2, aStr2,
194 nsICollation::kCollationCaseSensitive);
195 }
196
197 int
198 localeCollation16(void *aService,
199 int aLen1,
200 const void *aStr1,
201 int aLen2,
202 const void *aStr2)
203 {
204 return localeCollationHelper16(aService, aLen1, aStr1, aLen2, aStr2,
205 nsICollation::kCollationCaseInSensitive);
206 }
207
208 int
209 localeCollationCaseSensitive16(void *aService,
210 int aLen1,
211 const void *aStr1,
212 int aLen2,
213 const void *aStr2)
214 {
215 return localeCollationHelper16(aService, aLen1, aStr1, aLen2, aStr2,
216 nsICollation::kCollationAccentInsenstive);
217 }
218
219 int
220 localeCollationAccentSensitive16(void *aService,
221 int aLen1,
222 const void *aStr1,
223 int aLen2,
224 const void *aStr2)
225 {
226 return localeCollationHelper16(aService, aLen1, aStr1, aLen2, aStr2,
227 nsICollation::kCollationCaseInsensitiveAscii);
228 }
229
230 int
231 localeCollationCaseAccentSensitive16(void *aService,
232 int aLen1,
233 const void *aStr1,
234 int aLen2,
235 const void *aStr2)
236 {
237 return localeCollationHelper16(aService, aLen1, aStr1, aLen2, aStr2,
238 nsICollation::kCollationCaseSensitive);
239 }
240
241 } // namespace storage
242 } // namespace mozilla

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