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File / Folder	Size	Action
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ArrayHash.php	1.894KB	edt ren
ArrayList.php	2.645KB	edt ren
Arrays.php	13.781KB	edt ren
Callback.php	3.64KB	edt ren
DateTime.php	4.765KB	edt ren
FileInfo.php	1.3KB	edt ren
FileSystem.php	9.793KB	edt ren
Finder.php	13.421KB	edt ren
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Helpers.php	2.98KB	edt ren
Html.php	19.341KB	edt ren
Image.php	23.771KB	edt ren
ImageColor.php	1.654KB	edt ren
ImageType.php	0.497KB	edt ren
Iterables.php	6.234KB	edt ren
Json.php	2.535KB	edt ren
ObjectHelpers.php	7.074KB	edt ren
Paginator.php	4.384KB	edt ren
Random.php	1.246KB	edt ren
Reflection.php	8.691KB	edt ren
ReflectionMethod.php	0.84KB	edt ren
Strings.php	21.582KB	edt ren
Type.php	7.389KB	edt ren
Validators.php	10.678KB	edt ren
exceptions.php	0.742KB	edt ren

<?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\Utils;

use Nette;
use function is_array;

/**
 * Utilities for iterables.
 */
final class Iterables
{
	use Nette\StaticClass;

/**
	 * Tests for the presence of value.
	 */
	public static function contains(iterable $iterable, mixed $value): bool
	{
		foreach ($iterable as $v) {
			if ($v === $value) {
				return true;
			}
		}
		return false;
	}

/**
	 * Tests for the presence of key.
	 */
	public static function containsKey(iterable $iterable, mixed $key): bool
	{
		foreach ($iterable as $k => $v) {
			if ($k === $key) {
				return true;
			}
		}
		return false;
	}

/**
	 * Returns the first item (matching the specified predicate if given). If there is no such item, it returns result of invoking $else or null.
	 * @template K
	 * @template V
	 * @param  iterable<K, V>  $iterable
	 * @param  ?callable(V, K, iterable<K, V>): bool  $predicate
	 * @return ?V
	 */
	public static function first(iterable $iterable, ?callable $predicate = null, ?callable $else = null): mixed
	{
		foreach ($iterable as $k => $v) {
			if (!$predicate || $predicate($v, $k, $iterable)) {
				return $v;
			}
		}
		return $else ? $else() : null;
	}

/**
	 * Returns the key of first item (matching the specified predicate if given). If there is no such item, it returns result of invoking $else or null.
	 * @template K
	 * @template V
	 * @param  iterable<K, V>  $iterable
	 * @param  ?callable(V, K, iterable<K, V>): bool  $predicate
	 * @return ?K
	 */
	public static function firstKey(iterable $iterable, ?callable $predicate = null, ?callable $else = null): mixed
	{
		foreach ($iterable as $k => $v) {
			if (!$predicate || $predicate($v, $k, $iterable)) {
				return $k;
			}
		}
		return $else ? $else() : null;
	}

/**
	 * Tests whether at least one element in the iterator passes the test implemented by the provided function.
	 * @template K
	 * @template V
	 * @param  iterable<K, V>  $iterable
	 * @param  callable(V, K, iterable<K, V>): bool  $predicate
	 */
	public static function some(iterable $iterable, callable $predicate): bool
	{
		foreach ($iterable as $k => $v) {
			if ($predicate($v, $k, $iterable)) {
				return true;
			}
		}
		return false;
	}

/**
	 * Tests whether all elements in the iterator pass the test implemented by the provided function.
	 * @template K
	 * @template V
	 * @param  iterable<K, V>  $iterable
	 * @param  callable(V, K, iterable<K, V>): bool  $predicate
	 */
	public static function every(iterable $iterable, callable $predicate): bool
	{
		foreach ($iterable as $k => $v) {
			if (!$predicate($v, $k, $iterable)) {
				return false;
			}
		}
		return true;
	}

/**
	 * Iterator that filters elements according to a given $predicate. Maintains original keys.
	 * @template K
	 * @template V
	 * @param  iterable<K, V>  $iterable
	 * @param  callable(V, K, iterable<K, V>): bool  $predicate
	 * @return \Generator<K, V>
	 */
	public static function filter(iterable $iterable, callable $predicate): \Generator
	{
		foreach ($iterable as $k => $v) {
			if ($predicate($v, $k, $iterable)) {
				yield $k => $v;
			}
		}
	}

/**
	 * Iterator that transforms values by calling $transformer. Maintains original keys.
	 * @template K
	 * @template V
	 * @template R
	 * @param  iterable<K, V>  $iterable
	 * @param  callable(V, K, iterable<K, V>): R  $transformer
	 * @return \Generator<K, R>
	 */
	public static function map(iterable $iterable, callable $transformer): \Generator
	{
		foreach ($iterable as $k => $v) {
			yield $k => $transformer($v, $k, $iterable);
		}
	}

/**
	 * Iterator that transforms keys and values by calling $transformer. If it returns null, the element is skipped.
	 * @template K
	 * @template V
	 * @template ResV
	 * @template ResK
	 * @param  iterable<K, V>  $iterable
	 * @param  callable(V, K, iterable<K, V>): ?array{ResV, ResK}  $transformer
	 * @return \Generator<ResV, ResK>
	 */
	public static function mapWithKeys(iterable $iterable, callable $transformer): \Generator
	{
		foreach ($iterable as $k => $v) {
			$pair = $transformer($v, $k, $iterable);
			if ($pair) {
				yield $pair[0] => $pair[1];
			}
		}
	}

/**
	 * Creates a repeatable iterator from a factory function.
	 * The factory is called every time the iterator is iterated.
	 * @template K
	 * @template V
	 * @param  callable(): iterable<K, V>  $factory
	 * @return \IteratorAggregate<K, V>
	 */
	public static function repeatable(callable $factory): \IteratorAggregate
	{
		return new class ($factory) implements \IteratorAggregate {
			public function __construct(
				private $factory,
			) {
			}

public function getIterator(): \Iterator
			{
				return Iterables::toIterator(($this->factory)());
			}
		};
	}

/**
	 * Wraps around iterator and caches its keys and values during iteration.
	 * This allows the data to be re-iterated multiple times.
	 * @template K
	 * @template V
	 * @param  iterable<K, V>  $iterable
	 * @return \IteratorAggregate<K, V>
	 */
	public static function memoize(iterable $iterable): \IteratorAggregate
	{
		return new class (self::toIterator($iterable)) implements \IteratorAggregate {
			public function __construct(
				private \Iterator $iterator,
				private array $cache = [],
			) {
			}

public function getIterator(): \Generator
			{
				if (!$this->cache) {
					$this->iterator->rewind();
				}
				$i = 0;
				while (true) {
					if (isset($this->cache[$i])) {
						[$k, $v] = $this->cache[$i];
					} elseif ($this->iterator->valid()) {
						$k = $this->iterator->key();
						$v = $this->iterator->current();
						$this->iterator->next();
						$this->cache[$i] = [$k, $v];
					} else {
						break;
					}
					yield $k => $v;
					$i++;
				}
			}
		};
	}

/**
	 * Creates an iterator from anything that is iterable.
	 * @template K
	 * @template V
	 * @param  iterable<K, V>  $iterable
	 * @return \Iterator<K, V>
	 */
	public static function toIterator(iterable $iterable): \Iterator
	{
		return match (true) {
			$iterable instanceof \Iterator => $iterable,
			$iterable instanceof \IteratorAggregate => self::toIterator($iterable->getIterator()),
			is_array($iterable) => new \ArrayIterator($iterable),
			default => throw new Nette\ShouldNotHappenException,
		};
	}
}