public function parse(DateTimeParseContext $context, $text, $position)
{
if ($this->optional) {
$context->startOptional();
$pos = $position;
foreach ($this->printerParsers as $pp) {
$pos = $pp->parse($context, $text, $pos);
if ($pos < 0) {
$context->endOptional(false);
return $position;
// return original position
}
}
$context->endOptional(true);
return $pos;
} else {
foreach ($this->printerParsers as $pp) {
$position = $pp->parse($context, $text, $position);
if ($position < 0) {
break;
}
}
return $position;
}
}
