Level-2 / Transphporm

        return array_keys(array_column($this->tokens, 'type'), $tokenType);

    }

    public function from($tokenType, $inclusive = false) {

        $keys = $this->getKeysOfTokenType($tokenType);

        if (count($keys) === 0) return new Tokens([]);

        $key = $keys[0];

        for ($i = 0; $key < $this->iterator; $i++) $key = $keys[$i];

        if (!$inclusive) $key++;

        return new Tokens(array_slice($this->tokens, $key));

    }

    public function to($tokenType, $inclusive = false) {

        $keys = $this->getKeysOfTokenType($tokenType);

        return new Tokens(array_slice($this->tokens, $key));

    }

    public function to($tokenType, $inclusive = false) {

        $keys = $this->getKeysOfTokenType($tokenType);

        if (empty($keys)) return new Tokens([]);

        $key = $keys[0];

        for ($i = 0; $key < $this->iterator; $i++) $key = $keys[$i];

        if ($inclusive) $key++;

        return new Tokens(array_slice($this->tokens, 0, $key));

    }

    public function skip($count) {

        $this->iterator += $count;