88 lines
2.2 KiB
C++
88 lines
2.2 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
// Copyright The Music Player Daemon Project
|
|
|
|
#include "PositionArg.hxx"
|
|
#include "protocol/Ack.hxx"
|
|
#include "protocol/ArgParser.hxx"
|
|
#include "protocol/RangeArg.hxx"
|
|
#include "queue/Playlist.hxx"
|
|
|
|
static unsigned
|
|
RequireCurrentPosition(const playlist &p)
|
|
{
|
|
int position = p.GetCurrentPosition();
|
|
if (position < 0)
|
|
throw ProtocolError(ACK_ERROR_PLAYER_SYNC,
|
|
"No current song");
|
|
|
|
return position;
|
|
}
|
|
|
|
unsigned
|
|
ParseInsertPosition(const char *s, const playlist &playlist)
|
|
{
|
|
const auto queue_length = playlist.queue.GetLength();
|
|
|
|
if (*s == '+') {
|
|
/* after the current song */
|
|
|
|
const unsigned current = RequireCurrentPosition(playlist);
|
|
assert(current < queue_length);
|
|
|
|
return current + 1 +
|
|
ParseCommandArgUnsigned(s + 1,
|
|
queue_length - current - 1);
|
|
} else if (*s == '-') {
|
|
/* before the current song */
|
|
|
|
const unsigned current = RequireCurrentPosition(playlist);
|
|
assert(current < queue_length);
|
|
|
|
return current - ParseCommandArgUnsigned(s + 1, current);
|
|
} else
|
|
/* absolute position */
|
|
return ParseCommandArgUnsigned(s, queue_length);
|
|
}
|
|
|
|
unsigned
|
|
ParseMoveDestination(const char *s, const RangeArg range, const playlist &p)
|
|
{
|
|
assert(!range.IsEmpty());
|
|
assert(!range.IsOpenEnded());
|
|
|
|
const unsigned queue_length = p.queue.GetLength();
|
|
|
|
if (*s == '+') {
|
|
/* after the current song */
|
|
|
|
unsigned current = RequireCurrentPosition(p);
|
|
assert(current < queue_length);
|
|
if (range.Contains(current))
|
|
throw ProtocolError(ACK_ERROR_ARG, "Cannot move current song relative to itself");
|
|
|
|
if (current >= range.end)
|
|
current -= range.Count();
|
|
|
|
return current + 1 +
|
|
ParseCommandArgUnsigned(s + 1,
|
|
queue_length - current - range.Count());
|
|
} else if (*s == '-') {
|
|
/* before the current song */
|
|
|
|
unsigned current = RequireCurrentPosition(p);
|
|
assert(current < queue_length);
|
|
if (range.Contains(current))
|
|
throw ProtocolError(ACK_ERROR_ARG, "Cannot move current song relative to itself");
|
|
|
|
if (current >= range.end)
|
|
current -= range.Count();
|
|
|
|
return current -
|
|
ParseCommandArgUnsigned(s + 1,
|
|
queue_length - current - range.Count());
|
|
} else
|
|
/* absolute position */
|
|
return ParseCommandArgUnsigned(s,
|
|
queue_length - range.Count());
|
|
}
|