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song/OptimizeFilter: optimization stage for filters

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This commit is contained in:
Max Kellermann 2018-08-02 19:42:53 +02:00
parent 2d2120338b
commit 027e562f65
12 changed files with 133 additions and 0 deletions
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1
Makefile.am
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@ -1039,6 +1039,7 @@ libsong_a_SOURCES = \
src/song/AudioFormatSongFilter.cxx src/song/AudioFormatSongFilter.hxx \
src/song/AndSongFilter.cxx src/song/AndSongFilter.hxx \
src/song/NotSongFilter.hxx \
src/song/OptimizeFilter.cxx src/song/OptimizeFilter.hxx \
src/song/Filter.cxx src/song/Filter.hxx \
src/song/LightSong.cxx src/song/LightSong.hxx

7
src/command/DatabaseCommands.cxx
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@ -105,6 +105,7 @@ handle_match(Client &client, Request args, Response &r, bool fold_case)
GetFullMessage(std::current_exception()).c_str());
return CommandResult::ERROR;
}
filter.Optimize();
const DatabaseSelection selection("", true, &filter);
@ -138,6 +139,7 @@ handle_match_add(Client &client, Request args, Response &r, bool fold_case)
GetFullMessage(std::current_exception()).c_str());
return CommandResult::ERROR;
}
filter.Optimize();
auto &partition = client.GetPartition();
const ScopeBulkEdit bulk_edit(partition);
@ -172,6 +174,7 @@ handle_searchaddpl(Client &client, Request args, Response &r)
GetFullMessage(std::current_exception()).c_str());
return CommandResult::ERROR;
}
filter.Optimize();
const Database &db = client.GetDatabaseOrThrow();
@ -206,6 +209,8 @@ handle_count(Client &client, Request args, Response &r)
GetFullMessage(std::current_exception()).c_str());
return CommandResult::ERROR;
}
filter.Optimize();
}
PrintSongCount(r, client.GetPartition(), "", &filter, group);
@ -238,6 +243,7 @@ handle_list_file(Client &client, Request args, Response &r)
GetFullMessage(std::current_exception()).c_str());
return CommandResult::ERROR;
}
filter->Optimize();
}
PrintSongUris(r, client.GetPartition(), filter.get());
@ -300,6 +306,7 @@ handle_list(Client &client, Request args, Response &r)
GetFullMessage(std::current_exception()).c_str());
return CommandResult::ERROR;
}
filter->Optimize();
}
if (group_mask.Test(tagType)) {

1
src/command/QueueCommands.cxx
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@ -272,6 +272,7 @@ handle_playlist_match(Client &client, Request args, Response &r,
GetFullMessage(std::current_exception()).c_str());
return CommandResult::ERROR;
}
filter.Optimize();
playlist_print_find(r, client.GetPlaylist(), filter);
return CommandResult::OK;

3
src/song/AndSongFilter.hxx
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@ -31,6 +31,9 @@
class AndSongFilter final : public ISongFilter {
std::list<ISongFilterPtr> items;
friend void OptimizeSongFilter(AndSongFilter &) noexcept;
friend ISongFilterPtr OptimizeSongFilter(ISongFilterPtr) noexcept;
public:
const auto &GetItems() const noexcept {
return items;

6
src/song/Filter.cxx
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@ -352,6 +352,12 @@ SongFilter::Parse(ConstBuffer<const char *> args, bool fold_case)
} while (!args.empty());
}
void
SongFilter::Optimize() noexcept
{
OptimizeSongFilter(and_filter);
}
bool
SongFilter::Match(const LightSong &song) const noexcept
{

2
src/song/Filter.hxx
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@ -68,6 +68,8 @@ public:
*/
void Parse(ConstBuffer<const char *> args, bool fold_case=false);
void Optimize() noexcept;
gcc_pure
bool Match(const LightSong &song) const noexcept;

2
src/song/NotSongFilter.hxx
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@ -28,6 +28,8 @@
class NotSongFilter final : public ISongFilter {
ISongFilterPtr child;
friend ISongFilterPtr OptimizeSongFilter(ISongFilterPtr) noexcept;
public:
template<typename C>
explicit NotSongFilter(C &&_child) noexcept

73
src/song/OptimizeFilter.cxx Normal file
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@ -0,0 +1,73 @@
/*
* Copyright 2003-2018 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 "OptimizeFilter.hxx"
#include "AndSongFilter.hxx"
#include "NotSongFilter.hxx"
#include "TagSongFilter.hxx"
#include "UriSongFilter.hxx"
void
OptimizeSongFilter(AndSongFilter &af) noexcept
{
for (auto i = af.items.begin(); i != af.items.end();) {
auto f = OptimizeSongFilter(std::move(*i));
if (auto *nested = dynamic_cast<AndSongFilter *>(f.get())) {
/* collapse nested #AndSongFilter instances */
af.items.splice(i, std::move(nested->items));
i = af.items.erase(i);
} else {
*i = std::move(f);
++i;
}
}
}
ISongFilterPtr
OptimizeSongFilter(ISongFilterPtr f) noexcept
{
if (auto *af = dynamic_cast<AndSongFilter *>(f.get())) {
/* first optimize all items */
OptimizeSongFilter(*af);
if (!af->items.empty() &&
std::next(af->items.begin()) == af->items.end())
/* only one item: the containing
#AndSongFilter can be removed */
return std::move(af->items.front());
} else if (auto *nf = dynamic_cast<NotSongFilter *>(f.get())) {
auto child = OptimizeSongFilter(std::move(nf->child));
if (auto *tf = dynamic_cast<TagSongFilter *>(child.get())) {
/* #TagSongFilter has its own "negated" flag,
so we can drop the #NotSongFilter
container */
tf->negated = !tf->negated;
return child;
} else if (auto *uf = dynamic_cast<UriSongFilter *>(child.get())) {
/* same for #UriSongFilter */
uf->negated = !uf->negated;
return child;
}
nf->child = std::move(child);
}
return f;
}

33
src/song/OptimizeFilter.hxx Normal file
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@ -0,0 +1,33 @@
/*
* Copyright 2003-2018 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_OPTIMIZE_FILTER_HXX
#define MPD_SONG_OPTIMIZE_FILTER_HXX
#include "ISongFilter.hxx"
class AndSongFilter;
void
OptimizeSongFilter(AndSongFilter &af) noexcept;
ISongFilterPtr
OptimizeSongFilter(ISongFilterPtr f) noexcept;
#endif

2
src/song/TagSongFilter.hxx
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@ -38,6 +38,8 @@ class TagSongFilter final : public ISongFilter {
StringFilter filter;
friend ISongFilterPtr OptimizeSongFilter(ISongFilterPtr) noexcept;
public:
template<typename V>
TagSongFilter(TagType _type, V &&_value, bool fold_case, bool _negated)

2
src/song/UriSongFilter.hxx
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@ -28,6 +28,8 @@ class UriSongFilter final : public ISongFilter {
bool negated;
friend ISongFilterPtr OptimizeSongFilter(ISongFilterPtr) noexcept;
public:
template<typename V>
UriSongFilter(V &&_value, bool fold_case, bool _negated)

1
test/ParseSongFilter.cxx
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@ -41,6 +41,7 @@ try {
SongFilter filter;
filter.Parse(ConstBuffer<const char *>(argv + 1, argc - 1));
filter.Optimize();
puts(filter.ToExpression().c_str());
return EXIT_SUCCESS;