113 lines
2.7 KiB
C++
113 lines
2.7 KiB
C++
/*
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* Copyright 2003-2021 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPD_SONG_FILTER_HXX
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#define MPD_SONG_FILTER_HXX
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#include "AndSongFilter.hxx"
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#include "util/Compiler.h"
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#include <cstdint>
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#include <string>
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#include <string_view>
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/**
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* Special value for the db_selection_print() sort parameter.
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*/
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#define SORT_TAG_LAST_MODIFIED (TAG_NUM_OF_ITEM_TYPES + 3)
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template<typename T> struct ConstBuffer;
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enum TagType : uint8_t;
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struct LightSong;
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class SongFilter {
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AndSongFilter and_filter;
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public:
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SongFilter() = default;
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gcc_nonnull(3)
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SongFilter(TagType tag, const char *value, bool fold_case=false);
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~SongFilter();
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SongFilter(SongFilter &&) = default;
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SongFilter &operator=(SongFilter &&) = default;
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/**
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* Convert this object into an "expression". This is
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* only useful for debugging.
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*/
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std::string ToExpression() const noexcept;
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private:
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static ISongFilterPtr ParseExpression(const char *&s, bool fold_case=false);
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gcc_nonnull(2,3)
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void Parse(const char *tag, const char *value, bool fold_case=false);
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public:
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/**
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* Throws on error.
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*/
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void Parse(ConstBuffer<const char *> args, bool fold_case=false);
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void Optimize() noexcept;
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gcc_pure
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bool Match(const LightSong &song) const noexcept;
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const auto &GetItems() const noexcept {
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return and_filter.GetItems();
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}
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gcc_pure
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bool IsEmpty() const noexcept {
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return and_filter.IsEmpty();
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}
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/**
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* Is there at least one item with "fold case" enabled?
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*/
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gcc_pure
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bool HasFoldCase() const noexcept;
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/**
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* Does this filter contain constraints other than "base"?
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*/
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gcc_pure
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bool HasOtherThanBase() const noexcept;
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/**
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* Returns the "base" specification (if there is one) or
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* nullptr.
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*/
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gcc_pure
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const char *GetBase() const noexcept;
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/**
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* Create a copy of the filter with the given prefix stripped
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* from all #LOCATE_TAG_BASE_TYPE items. This is used to
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* filter songs in mounted databases.
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*/
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SongFilter WithoutBasePrefix(std::string_view prefix) const noexcept;
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};
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#endif
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