protected function parenValue(&$out)
{
$s = $this->seek();
$inParens = $this->inParens;
if ($this->literal('(')) {
if ($this->literal(')')) {
$out = [Type::T_LIST, '', []];
return true;
}
$this->inParens = true;
if ($this->expression($exp) && $this->literal(')')) {
$out = $exp;
$this->inParens = $inParens;
return true;
}
}
$this->inParens = $inParens;
$this->seek($s);
return false;
}