lib/icu/Compare: OO wrapper for IcuCaseFold()

Makefile.am

@@ -519,6 +519,7 @@ libevent_a_SOURCES = \
 
 libicu_a_SOURCES = \
 	src/lib/icu/CaseFold.cxx src/lib/icu/CaseFold.hxx \
+	src/lib/icu/Compare.cxx src/lib/icu/Compare.hxx \
 	src/lib/icu/Collate.cxx src/lib/icu/Collate.hxx \
 	src/lib/icu/Converter.cxx src/lib/icu/Converter.hxx
 

src/lib/icu/Compare.cxx

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2003-2017 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 "Compare.hxx"
+#include "CaseFold.hxx"
+#include "util/StringAPI.hxx"
+
+#include <string.h>
+
+IcuCompare::IcuCompare(const char *_needle) noexcept
+	:needle(IcuCaseFold(_needle)) {}
+
+bool
+IcuCompare::operator==(const char *haystack) const noexcept
+{
+	return StringIsEqual(IcuCaseFold(haystack).c_str(), needle.c_str());
+}
+
+bool
+IcuCompare::IsIn(const char *haystack) const noexcept
+{
+	return StringFind(IcuCaseFold(haystack).c_str(),
+			  needle.c_str()) != nullptr;
+}

src/lib/icu/Compare.hxx

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2003-2017 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.
+ */
+
+#ifndef MPD_ICU_COMPARE_HXX
+#define MPD_ICU_COMPARE_HXX
+
+#include "check.h"
+#include "Compiler.h"
+#include "util/AllocatedString.hxx"
+
+/**
+ * This class can compare one string ("needle") with lots of other
+ * strings ("haystacks") efficiently, ignoring case.  With some
+ * configurations, it can prepare a case-folded version of the needle.
+ */
+class IcuCompare {
+	AllocatedString<> needle;
+
+public:
+	IcuCompare():needle(nullptr) {}
+
+	explicit IcuCompare(const char *needle) noexcept;
+
+	IcuCompare(IcuCompare &&) = default;
+	IcuCompare &operator=(IcuCompare &&) = default;
+
+	gcc_pure
+	operator bool() const noexcept {
+		return !needle.IsNull();
+	}
+
+	gcc_pure
+	bool operator==(const char *haystack) const noexcept;
+
+	gcc_pure
+	bool IsIn(const char *haystack) const noexcept;
+};
+
+#endif