Subversion-Projekte lars-tiefland.laravel_shop

<?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, is_object($iterator) ? $iterator::class : gettype($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();
        }
}