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/*
* 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;
}
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