src/Placeholder/src/Placeholder.php
<?php
/**
* This file is part of phpfn package.
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
declare(strict_types=1);
namespace Fun\Placeholder;
use Fun\Symbol\Symbol;
final class Placeholder
{
/**
* @param iterable $items
* @param \Closure $each
* @return array
*/
public static function map(iterable $items, \Closure $each): array
{
return \iterator_to_array(self::lazyMap($items, $each));
}
/**
* @param iterable $items
* @param \Closure $each
* @return \Traversable
*/
public static function lazyMap(iterable $items, \Closure $each): \Traversable
{
foreach ($items as $key => $value) {
yield self::match($value) ? $each($key, $items) : $value;
}
}
/**
* @param mixed $value
* @return bool
*/
public static function match($value): bool
{
static $placeholder;
return $value === ($placeholder ?? $placeholder = Symbol::for(self::class));
}
/**
* @param iterable $items
* @param \Closure|null $filter
* @return array
*/
public static function filter(iterable $items, \Closure $filter = null): array
{
return \iterator_to_array(self::lazyFilter($items, $filter));
}
/**
* @param iterable $items
* @param \Closure|null $filter
* @return \Traversable
*/
public static function lazyFilter(iterable $items, \Closure $filter = null): \Traversable
{
foreach ($items as $key => $value) {
if (self::match($value) && ($filter === null || $filter($key, $items))) {
continue;
}
yield $value;
}
}
}