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/*
* Copyright 2003-2021 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 "XspfPlaylistPlugin.hxx"
#include "../PlaylistPlugin.hxx"
#include "../MemorySongEnumerator.hxx"
#include "song/DetachedSong.hxx"
#include "input/InputStream.hxx"
#include "tag/Builder.hxx"
#include "tag/Table.hxx"
#include "util/StringView.hxx"
#include "lib/expat/ExpatParser.hxx"
#include <string.h>
/**
* This is the state object for our XML parser.
*/
struct XspfParser {
/**
* The list of songs (in reverse order because that's faster
* while adding).
*/
std::forward_list<DetachedSong> songs;
/**
* The current position in the XML file.
*/
enum {
ROOT, PLAYLIST, TRACKLIST, TRACK,
TAG, LOCATION,
} state = ROOT;
/**
* The current tag within the "track" element. This is only
* valid if state==TRACK. TAG_NUM_OF_ITEM_TYPES means there
* is no (known) tag.
*/
TagType tag_type;
/**
* The current song URI. It is set by the "location" element.
*/
std::string location;
TagBuilder tag_builder;
std::string value;
};
static constexpr struct tag_table xspf_tag_elements[] = {
{ "title", TAG_TITLE },
/* TAG_COMPOSER would be more correct according to the XSPF
spec */
{ "creator", TAG_ARTIST },
{ "annotation", TAG_COMMENT },
{ "album", TAG_ALBUM },
{ "trackNum", TAG_TRACK },
{ nullptr, TAG_NUM_OF_ITEM_TYPES }
};
static void XMLCALL
xspf_start_element(void *user_data, const XML_Char *element_name,
[[maybe_unused]] const XML_Char **atts)
{
auto *parser = (XspfParser *)user_data;
parser->value.clear();
switch (parser->state) {
case XspfParser::ROOT:
if (strcmp(element_name, "playlist") == 0)
parser->state = XspfParser::PLAYLIST;
break;
case XspfParser::PLAYLIST:
if (strcmp(element_name, "trackList") == 0)
parser->state = XspfParser::TRACKLIST;
break;
case XspfParser::TRACKLIST:
if (strcmp(element_name, "track") == 0) {
parser->state = XspfParser::TRACK;
parser->location.clear();
}
break;
case XspfParser::TRACK:
if (strcmp(element_name, "location") == 0)
parser->state = XspfParser::LOCATION;
else if (!parser->location.empty()) {
parser->tag_type = tag_table_lookup(xspf_tag_elements,
element_name);
if (parser->tag_type != TAG_NUM_OF_ITEM_TYPES)
parser->state = XspfParser::TAG;
}
break;
case XspfParser::TAG:
case XspfParser::LOCATION:
break;
}
}
static void XMLCALL
xspf_end_element(void *user_data, const XML_Char *element_name)
{
auto *parser = (XspfParser *)user_data;
switch (parser->state) {
case XspfParser::ROOT:
break;
case XspfParser::PLAYLIST:
if (strcmp(element_name, "playlist") == 0)
parser->state = XspfParser::ROOT;
break;
case XspfParser::TRACKLIST:
if (strcmp(element_name, "tracklist") == 0)
parser->state = XspfParser::PLAYLIST;
break;
case XspfParser::TRACK:
if (strcmp(element_name, "track") == 0) {
if (!parser->location.empty())
parser->songs.emplace_front(std::move(parser->location),
parser->tag_builder.Commit());
parser->state = XspfParser::TRACKLIST;
}
break;
case XspfParser::TAG:
if (!parser->value.empty())
parser->tag_builder.AddItem(parser->tag_type,
StringView(parser->value.data(),
parser->value.length()));
parser->state = XspfParser::TRACK;
break;
case XspfParser::LOCATION:
parser->location = std::move(parser->value);
parser->state = XspfParser::TRACK;
break;
}
parser->value.clear();
}
static void XMLCALL
xspf_char_data(void *user_data, const XML_Char *s, int len)
{
auto *parser = (XspfParser *)user_data;
switch (parser->state) {
case XspfParser::ROOT:
case XspfParser::PLAYLIST:
case XspfParser::TRACKLIST:
case XspfParser::TRACK:
break;
case XspfParser::TAG:
case XspfParser::LOCATION:
parser->value.append(s, len);
break;
}
}
/*
* The playlist object
*
*/
static std::unique_ptr<SongEnumerator>
xspf_open_stream(InputStreamPtr &&is)
{
XspfParser parser;
{
ExpatParser expat(&parser);
expat.SetElementHandler(xspf_start_element, xspf_end_element);
expat.SetCharacterDataHandler(xspf_char_data);
expat.Parse(*is);
}
parser.songs.reverse();
return std::make_unique<MemorySongEnumerator>(std::move(parser.songs));
}
static const char *const xspf_suffixes[] = {
"xspf",
nullptr
};
static const char *const xspf_mime_types[] = {
"application/xspf+xml",
nullptr
};
const PlaylistPlugin xspf_playlist_plugin =
PlaylistPlugin("xspf", xspf_open_stream)
.WithSuffixes(xspf_suffixes)
.WithMimeTypes(xspf_mime_types);
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