public function op_next($op, $pos, &$op_queue, &$token_queue)
{
$num_args = 0;
$next_index = array_search($op->input, $this->op_parts);
$is_next = (bool) (0 === $next_index);
if ($is_next) {
if (0 === $this->op_def[0][0]) {
$num_args = XpresionOp::match_args($this->op_def[0][2], $pos - 1, $op_queue, $token_queue);
if (false === $num_args) {
$is_next = false;
} else {
$this->arity = $num_args;
array_shift($this->op_def);
}
}
}
if ($is_next) {
array_shift($this->op_def);
array_shift($this->op_parts);
}
return $is_next;
}
