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/*
* Copyright 2003-2016 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 "XspfPlaylistPlugin.hxx"
#include "../PlaylistPlugin.hxx"
#include "../MemorySongEnumerator.hxx"
#include "DetachedSong.hxx"
#include "input/InputStream.hxx"
#include "tag/TagBuilder.hxx"
#include "util/StringView.hxx"
#include "lib/expat/ExpatParser.hxx"
#include "Log.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,
LOCATION,
} state;
/**
* 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;
XspfParser()
:state(ROOT) {}
};
static void XMLCALL
xspf_start_element(void *user_data, const XML_Char *element_name,
gcc_unused const XML_Char **atts)
{
XspfParser *parser = (XspfParser *)user_data;
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();
parser->tag_type = TAG_NUM_OF_ITEM_TYPES;
}
break;
case XspfParser::TRACK:
if (strcmp(element_name, "location") == 0)
parser->state = XspfParser::LOCATION;
else if (strcmp(element_name, "title") == 0)
parser->tag_type = TAG_TITLE;
else if (strcmp(element_name, "creator") == 0)
/* TAG_COMPOSER would be more correct
according to the XSPF spec */
parser->tag_type = TAG_ARTIST;
else if (strcmp(element_name, "annotation") == 0)
parser->tag_type = TAG_COMMENT;
else if (strcmp(element_name, "album") == 0)
parser->tag_type = TAG_ALBUM;
else if (strcmp(element_name, "trackNum") == 0)
parser->tag_type = TAG_TRACK;
break;
case XspfParser::LOCATION:
break;
}
}
static void XMLCALL
xspf_end_element(void *user_data, const XML_Char *element_name)
{
XspfParser *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;
} else
parser->tag_type = TAG_NUM_OF_ITEM_TYPES;
break;
case XspfParser::LOCATION:
parser->state = XspfParser::TRACK;
break;
}
}
static void XMLCALL
xspf_char_data(void *user_data, const XML_Char *s, int len)
{
XspfParser *parser = (XspfParser *)user_data;
switch (parser->state) {
case XspfParser::ROOT:
case XspfParser::PLAYLIST:
case XspfParser::TRACKLIST:
break;
case XspfParser::TRACK:
if (!parser->location.empty() &&
parser->tag_type != TAG_NUM_OF_ITEM_TYPES)
parser->tag_builder.AddItem(parser->tag_type,
StringView(s, len));
break;
case XspfParser::LOCATION:
parser->location.assign(s, len);
break;
}
}
/*
* The playlist object
*
*/
static 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 new 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 struct playlist_plugin xspf_playlist_plugin = {
"xspf",
nullptr,
nullptr,
nullptr,
xspf_open_stream,
nullptr,
xspf_suffixes,
xspf_mime_types,
};
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