/**
* Parses repeat alternative
*
* @param Song $song
* @param integer $measure
*
* @return integer Number of repeat alternatives
*/
public function parseRepeatAlternative(Song $song, $measure)
{
$value = $this->reader->readUnsignedByte();
$repeatAlternative = 0;
$existentAlternatives = 0;
$headers = $song->getMeasureHeaders();
foreach ($headers as $header) {
if ($header->getNumber() == $measure) {
break;
}
if ($header->isRepeatOpen()) {
$existentAlternatives = 0;
}
$existentAlternatives |= $header->getRepeatAlternative();
}
for ($i = 0; $i < 8; $i++) {
if ($value > $i && ($existentAlternatives & 1 << $i) == 0) {
$repeatAlternative |= 1 << $i;
}
}
return $repeatAlternative;
}
