327     protected function nextTokenOnChannel(int $i, int $channel) : int  argument
336         while ($token->getChannel() !== $channel) {
360     protected function previousTokenOnChannel(int $i, int $channel) : int  argument
362         while ($i >= 0 && $this->tokens[$i]->getChannel() !== $channel) {
376     public function getHiddenTokensToRight(int $tokenIndex, int $channel) : ?array  argument
389         return $this->filterForChannel($from_, $to, $channel);
399     public function getHiddenTokensToLeft(int $tokenIndex, int $channel) : ?array  argument
417         return $this->filterForChannel($from, $to, $channel);
423     protected function filterForChannel(int $left, int $right, int $channel) : ?array  argument
429             if ($channel === -1) {
433             } elseif ($t->getChannel() === $channel) {