Extract Collator class.

1 files changed, 69 insertions, 0 deletions

diff --git a/src/lib/collator.cc b/src/lib/collator.cc
new file mode 100644
index 000000000..4f52597c2
--- /dev/null
+++ b/src/lib/collator.cc
@@ -0,0 +1,69 @@
+/*
+    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());
+	}
+}
+