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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(); } }
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