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diff --git a/src/SongFilter.hxx b/src/SongFilter.hxx
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+/*
+ * Copyright (C) 2003-2012 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_SONG_FILTER_HXX
+#define MPD_SONG_FILTER_HXX
+
+#include "gcc.h"
+
+#include <list>
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#define LOCATE_TAG_FILE_TYPE TAG_NUM_OF_ITEM_TYPES+10
+#define LOCATE_TAG_ANY_TYPE TAG_NUM_OF_ITEM_TYPES+20
+
+struct tag;
+struct tag_item;
+struct song;
+
+class SongFilter {
+ class Item {
+ uint8_t tag;
+
+ bool fold_case;
+
+ char *value;
+
+ public:
+ gcc_nonnull(3)
+ Item(unsigned tag, const char *value, bool fold_case=false);
+
+ Item(const Item &other) = delete;
+
+ Item(Item &&other)
+ :tag(other.tag), fold_case(other.fold_case),
+ value(other.value) {
+ other.value = nullptr;
+ }
+
+ ~Item();
+
+ Item &operator=(const Item &other) = delete;
+
+ unsigned GetTag() const {
+ return tag;
+ }
+
+ gcc_pure gcc_nonnull(2)
+ bool StringMatch(const char *s) const;
+
+ gcc_pure
+ bool Match(const tag_item &tag_item) const;
+
+ gcc_pure
+ bool Match(const struct tag &tag) const;
+
+ gcc_pure
+ bool Match(const song &song) const;
+ };
+
+ std::list<Item> items;
+
+public:
+ SongFilter() = default;
+
+ gcc_nonnull(3)
+ SongFilter(unsigned tag, const char *value, bool fold_case=false);
+
+ ~SongFilter();
+
+ gcc_nonnull(2,3)
+ bool Parse(const char *tag, const char *value, bool fold_case=false);
+
+ gcc_nonnull(3)
+ bool Parse(unsigned argc, char *argv[], bool fold_case=false);
+
+ gcc_pure
+ bool Match(const tag &tag) const;
+
+ gcc_pure
+ bool Match(const song &song) const;
+};
+
+/**
+ * @return #TAG_NUM_OF_ITEM_TYPES on error
+ */
+gcc_pure
+unsigned
+locate_parse_type(const char *str);
+
+#endif