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<?php
/**
* This file is part of the Nette Framework (https://nette.org)
* Copyright (c) 2004 David Grudl (https://davidgrudl.com)
*/
declare(strict_types=1);
namespace Nette\Iterators;
use Nette;
/**
* Smarter caching iterator.
*
* @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 mixed $nextKey
* @property-read mixed $nextValue
*/
class CachingIterator extends \CachingIterator implements \Countable
{
use Nette\SmartObject;
private int $counter = 0;
public function __construct($iterator)
{
if (is_array($iterator) || $iterator instanceof \stdClass) {
$iterator = new \ArrayIterator($iterator);
} elseif ($iterator instanceof \IteratorAggregate) {
do {
$iterator = $iterator->getIterator();
} while ($iterator instanceof \IteratorAggregate);
assert($iterator instanceof \Iterator);
} elseif ($iterator instanceof \Iterator) {
} elseif ($iterator instanceof \Traversable) {
$iterator = new \IteratorIterator($iterator);
} else {
throw new Nette\InvalidArgumentException(sprintf('Invalid argument passed to %s; array or Traversable expected, %s given.', self::class, get_debug_type($iterator)));
}
parent::__construct($iterator, 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);
}
/**
* Is the iterator empty?
*/
public function isEmpty(): bool
{
return $this->counter === 0;
}
/**
* Is the counter odd?
*/
public function isOdd(): bool
{
return $this->counter % 2 === 1;
}
/**
* Is the counter even?
*/
public function isEven(): bool
{
return $this->counter % 2 === 0;
}
/**
* Returns the counter.
*/
public function getCounter(): int
{
return $this->counter;
}
/**
* Returns the count of elements.
*/
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;
}
/**
* Returns the next key.
*/
public function getNextKey(): mixed
{
return $this->getInnerIterator()->key();
}
/**
* Returns the next element.
*/
public function getNextValue(): mixed
{
return $this->getInnerIterator()->current();
}
}