aboutsummaryrefslogtreecommitdiffstats
path: root/src/lib/icu/Collate.cxx
blob: f6621eb21ac874314fc8848b4c1dccb307ae3bfd (plain) (blame)
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
/*
 * Copyright (C) 2003-2014 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"
#include "Collate.hxx"

#ifdef HAVE_ICU
#include "Error.hxx"
#include "util/WritableBuffer.hxx"
#include "util/ConstBuffer.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"

#include <unicode/ucol.h>
#include <unicode/ustring.h>
#elif defined(HAVE_GLIB)
#include <glib.h>
#else
#include <algorithm>
#include <ctype.h>
#endif

#include <assert.h>
#include <string.h>

#ifdef HAVE_ICU
static UCollator *collator;
#endif

#ifdef HAVE_ICU

bool
IcuCollateInit(Error &error)
{
	assert(collator == nullptr);
	assert(!error.IsDefined());

	UErrorCode code = U_ZERO_ERROR;
	collator = ucol_open("", &code);
	if (collator == nullptr) {
		error.Format(icu_domain, int(code),
			     "ucol_open() failed: %s", u_errorName(code));
		return false;
	}

	return true;
}

void
IcuCollateFinish()
{
	assert(collator != nullptr);

	ucol_close(collator);
}

static WritableBuffer<UChar>
UCharFromUTF8(const char *src)
{
	assert(src != nullptr);

	const size_t src_length = strlen(src);
	const size_t dest_capacity = src_length;
	UChar *dest = new UChar[dest_capacity];

	UErrorCode error_code = U_ZERO_ERROR;
	int32_t dest_length;
	u_strFromUTF8(dest, dest_capacity, &dest_length,
		      src, src_length,
		      &error_code);
	if (U_FAILURE(error_code)) {
		delete[] dest;
		return nullptr;
	}

	return { dest, size_t(dest_length) };
}

static WritableBuffer<char>
UCharToUTF8(ConstBuffer<UChar> src)
{
	assert(!src.IsNull());

	/* worst-case estimate */
	size_t dest_capacity = 4 * src.size;

	char *dest = new char[dest_capacity];

	UErrorCode error_code = U_ZERO_ERROR;
	int32_t dest_length;
	u_strToUTF8(dest, dest_capacity, &dest_length, src.data, src.size,
		    &error_code);
	if (U_FAILURE(error_code)) {
		delete[] dest;
		return nullptr;
	}

	return { dest, size_t(dest_length) };
}

#endif

gcc_pure
int
IcuCollate(const char *a, const char *b)
{
	assert(a != nullptr);
	assert(b != nullptr);

#ifdef HAVE_ICU
	assert(collator != nullptr);

#if U_ICU_VERSION_MAJOR_NUM >= 50
	UErrorCode code = U_ZERO_ERROR;
	return (int)ucol_strcollUTF8(collator, a, -1, b, -1, &code);
#else
	/* fall back to ucol_strcoll() */

	const auto au = UCharFromUTF8(a);
	const auto bu = UCharFromUTF8(b);

	int result = !au.IsNull() && !bu.IsNull()
		? (int)ucol_strcoll(collator, au.data, au.size,
				    bu.data, bu.size)
		: strcasecmp(a, b);

	delete[] au.data;
	delete[] bu.data;

	return result;
#endif

#elif defined(HAVE_GLIB)
	return g_utf8_collate(a, b);
#else
	return strcasecmp(a, b);
#endif
}

std::string
IcuCaseFold(const char *src)
{
#ifdef HAVE_ICU
	assert(collator != nullptr);
	assert(src != nullptr);

	const auto u = UCharFromUTF8(src);
	if (u.IsNull())
		return std::string(src);

	size_t folded_capacity = u.size * 2u;
	UChar *folded = new UChar[folded_capacity];

	UErrorCode error_code = U_ZERO_ERROR;
	size_t folded_length = u_strFoldCase(folded, folded_capacity,
					   u.data, u.size,
					   U_FOLD_CASE_DEFAULT,
					   &error_code);
	delete[] u.data;
	if (folded_length == 0 || error_code != U_ZERO_ERROR) {
		delete[] folded;
		return std::string(src);
	}

	auto result2 = UCharToUTF8({folded, folded_length});
	delete[] folded;
	if (result2.IsNull())
		return std::string(src);

	std::string result(result2.data, result2.size);
	delete[] result2.data;
#elif defined(HAVE_GLIB)
	char *tmp = g_utf8_casefold(src, -1);
	std::string result(tmp);
	g_free(tmp);
#else
	std::string result(src);
	std::transform(result.begin(), result.end(), result.begin(), tolower);
#endif
	return result;
}