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* @property-read bool $first
* @property-read bool $last
* @property-read bool $empty
* @property-read bool $odd
* @property-read bool $even
* @property-read int $counter
* @property-read TKey $nextKey
* @property-read TValue $nextValue
*/
class CachingIterator extends \CachingIterator implements \Countable
{
use Nette\SmartObject;
private int $counter = 0;
/** @param iterable|\stdClass $iterable */
public function __construct(iterable|\stdClass $iterable)
{
$iterable = $iterable instanceof \stdClass
? new \ArrayIterator((array) $iterable)
: Nette\Utils\Iterables::toIterator($iterable);
parent::__construct($iterable, 0);
}
/**
* Is the current element the first one?
*/
public function isFirst(?int $gridWidth = null): bool
{
return $this->counter === 1 || ($gridWidth && $this->counter !== 0 && (($this->counter - 1) % $gridWidth) === 0);
}
/**
* Is the current element the last one?
*/
public function isLast(?int $gridWidth = null): bool
{
return !$this->hasNext() || ($gridWidth && ($this->counter % $gridWidth) === 0);
}
public function isEmpty(): bool
{
return $this->counter === 0;
}
public function isOdd(): bool
{
return $this->counter % 2 === 1;
}
public function isEven(): bool
{
return $this->counter % 2 === 0;
}
public function getCounter(): int
{
return $this->counter;
}
public function count(): int
{
$inner = $this->getInnerIterator();
if ($inner instanceof \Countable) {
return $inner->count();
} else {
throw new Nette\NotSupportedException('Iterator is not countable.');
}
}
/**
* Forwards to the next element.
*/
public function next(): void
{
parent::next();
if (parent::valid()) {
$this->counter++;
}
}
/**
* Rewinds the Iterator.
*/
public function rewind(): void
{
parent::rewind();
$this->counter = parent::valid() ? 1 : 0;
}
/** @return TKey */
public function getNextKey(): mixed
{
return $this->getInnerIterator()->key();
}
/** @return TValue */
public function getNextValue(): mixed
{
return $this->getInnerIterator()->current();
}
}