+/*
+ Copyright (C) 2022 Carl Hetherington <cth@carlh.net>
+
+ This file is part of DCP-o-matic.
+
+ DCP-o-matic 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.
+
+ DCP-o-matic 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 DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+
+#include "collator.h"
+#include <unicode/putil.h>
+#include <unicode/ucol.h>
+#include <unicode/uiter.h>
+#include <unicode/utypes.h>
+#include <unicode/ustring.h>
+#include <boost/scoped_array.hpp>
+#include <cstring>
+
+
+using std::string;
+
+
+Collator::Collator()
+{
+ UErrorCode status = U_ZERO_ERROR;
+ _collator = ucol_open(nullptr, &status);
+ if (_collator) {
+ ucol_setAttribute(_collator, UCOL_NORMALIZATION_MODE, UCOL_ON, &status);
+ ucol_setAttribute(_collator, UCOL_STRENGTH, UCOL_PRIMARY, &status);
+ ucol_setAttribute(_collator, UCOL_ALTERNATE_HANDLING, UCOL_SHIFTED, &status);
+ }
+}
+
+
+Collator::~Collator()
+{
+ if (_collator) {
+ ucol_close (_collator);
+ }
+}
+
+
+int
+Collator::compare (string const& utf8_a, string const& utf8_b)
+{
+ if (_collator) {
+ UErrorCode error = U_ZERO_ERROR;
+ boost::scoped_array<uint16_t> utf16_a(new uint16_t[utf8_a.size() + 1]);
+ u_strFromUTF8(reinterpret_cast<UChar*>(utf16_a.get()), utf8_a.size() + 1, nullptr, utf8_a.c_str(), -1, &error);
+ boost::scoped_array<uint16_t> utf16_b(new uint16_t[utf8_b.size() + 1]);
+ u_strFromUTF8(reinterpret_cast<UChar*>(utf16_b.get()), utf8_b.size() + 1, nullptr, utf8_b.c_str(), -1, &error);
+ return ucol_strcoll(_collator, reinterpret_cast<UChar*>(utf16_a.get()), -1, reinterpret_cast<UChar*>(utf16_b.get()), -1);
+ } else {
+ return strcoll(utf8_a.c_str(), utf8_b.c_str());
+ }
+}
+