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DotArrayFilter.php
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107 lines (89 loc) · 3.18 KB
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<?php
declare(strict_types=1);
/**
* This file is part of CodeIgniter 4 framework.
*
* (c) CodeIgniter Foundation <admin@codeigniter.com>
*
* For the full copyright and license information, please view
* the LICENSE file that was distributed with this source code.
*/
namespace CodeIgniter\Validation;
/**
* @see \CodeIgniter\Validation\DotArrayFilterTest
*/
final class DotArrayFilter
{
/**
* Creates a new array with only the elements specified in dot array syntax.
*
* @param array $indexes The dot array syntax pattern to use for filtering.
* @param array $array The array to filter.
*
* @return array The filtered array.
*/
public static function run(array $indexes, array $array): array
{
$result = [];
foreach ($indexes as $index) {
$segments = preg_split('/(?<!\\\\)\./', $index, -1, PREG_SPLIT_NO_EMPTY);
$segments = array_map(static fn ($key): string => str_replace('\.', '.', $key), $segments);
$filteredArray = self::filter($segments, $array);
if ($filteredArray !== []) {
$result = array_replace_recursive($result, $filteredArray);
}
}
return $result;
}
/**
* Used by `run()` to recursively filter the array with wildcards.
*
* @param array $indexes The dot array syntax pattern to use for filtering.
* @param array $array The array to filter.
*
* @return array The filtered array.
*/
private static function filter(array $indexes, array $array): array
{
// If there are no indexes left, return an empty array
if ($indexes === []) {
return [];
}
// Get the current index
$currentIndex = array_shift($indexes);
// If the current index doesn't exist and is not a wildcard, return an empty array
if (! isset($array[$currentIndex]) && $currentIndex !== '*') {
return [];
}
// Handle the wildcard '*' at the current level
if ($currentIndex === '*') {
$result = [];
// Iterate over all keys at this level
foreach ($array as $key => $value) {
if ($indexes === []) {
// If no indexes are left, capture the entire value
$result[$key] = $value;
} elseif (is_array($value)) {
// If there are still indexes left, continue filtering recursively
$filtered = self::filter($indexes, $value);
if ($filtered !== []) {
$result[$key] = $filtered;
}
}
}
return $result;
}
// If this is the last index, return the value
if ($indexes === []) {
return [$currentIndex => $array[$currentIndex] ?? []];
}
// If the current value is an array, recursively filter it
if (is_array($array[$currentIndex])) {
$filtered = self::filter($indexes, $array[$currentIndex]);
if ($filtered !== []) {
return [$currentIndex => $filtered];
}
}
return [];
}
}