aboutsummaryrefslogtreecommitdiffstats
path: root/src/lib/icu/Collate.cxx
blob: 1dde5d5e268b385342fad47119e35a6eaa6d6531 (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
/*
 * 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 "Util.hxx"
#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>
#include <strings.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);
}

#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;
}