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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | /** |
| 6 | * This file is part of php-fast-forward/config. |
| 7 | * |
| 8 | * This source file is subject to the license bundled |
| 9 | * with this source code in the file LICENSE. |
| 10 | * |
| 11 | * @link https://github.com/php-fast-forward/config |
| 12 | * @copyright Copyright (c) 2025 Felipe Sayão Lobato Abreu <github@mentordosnerds.com> |
| 13 | * @license https://opensource.org/licenses/MIT MIT License |
| 14 | */ |
| 15 | |
| 16 | namespace FastForward\Config\Helper; |
| 17 | |
| 18 | use Dflydev\DotAccessData\Data; |
| 19 | use Dflydev\DotAccessData\DataInterface; |
| 20 | use Dflydev\DotAccessData\Util; |
| 21 | |
| 22 | /** |
| 23 | * Class ConfigHelper. |
| 24 | * |
| 25 | * Provides a set of static helper methods for manipulating configuration arrays, |
| 26 | * particularly handling associative arrays with dot notation and nested structures. |
| 27 | * This class SHALL NOT be instantiated and MUST be used statically. |
| 28 | */ |
| 29 | final class ConfigHelper |
| 30 | { |
| 31 | /** |
| 32 | * ConfigHelper constructor. |
| 33 | * |
| 34 | * This constructor is private to prevent instantiation of the class. |
| 35 | * The class MUST be used in a static context only. |
| 36 | * |
| 37 | * @codeCoverageIgnore |
| 38 | */ |
| 39 | private function __construct() |
| 40 | { |
| 41 | // Prevent instantiation |
| 42 | } |
| 43 | |
| 44 | /** |
| 45 | * Determines if the provided value is an associative array. |
| 46 | * |
| 47 | * This method SHALL check whether the given array uses string keys, |
| 48 | * distinguishing it from indexed arrays. |
| 49 | * |
| 50 | * @param mixed $value the value to check |
| 51 | * |
| 52 | * @return bool true if the array is associative; false otherwise |
| 53 | */ |
| 54 | public static function isAssoc(mixed $value): bool |
| 55 | { |
| 56 | return \is_array($value) && Util::isAssoc($value); |
| 57 | } |
| 58 | |
| 59 | /** |
| 60 | * Normalizes a configuration array using dot notation delimiters. |
| 61 | * |
| 62 | * This method SHALL recursively convert keys containing delimiters into nested arrays. |
| 63 | * For example, a key like "database.host" SHALL be transformed into |
| 64 | * ['database' => ['host' => 'value']]. |
| 65 | * |
| 66 | * @param array $config the configuration array to normalize |
| 67 | * |
| 68 | * @return array the normalized configuration array |
| 69 | */ |
| 70 | public static function normalize(array $config): array |
| 71 | { |
| 72 | if (!self::isAssoc($config)) { |
| 73 | return $config; |
| 74 | } |
| 75 | |
| 76 | $normalized = []; |
| 77 | |
| 78 | $reflectionConst = new \ReflectionClassConstant(Data::class, 'DELIMITERS'); |
| 79 | $delimiters = $reflectionConst->getValue(); |
| 80 | |
| 81 | $delimiterChars = implode('', $delimiters); |
| 82 | $delimitersPattern = '/[' . preg_quote($delimiterChars, '/') . ']/'; |
| 83 | |
| 84 | foreach ($config as $key => $value) { |
| 85 | if (self::isAssoc($value)) { |
| 86 | $value = self::normalize($value); |
| 87 | } |
| 88 | |
| 89 | if (!\is_string($key) || false === strpbrk($key, $delimiterChars)) { |
| 90 | $normalized[$key] = $value; |
| 91 | |
| 92 | continue; |
| 93 | } |
| 94 | |
| 95 | $parts = preg_split($delimitersPattern, $key); |
| 96 | $current = &$normalized; |
| 97 | $lastIndex = \count($parts) - 1; |
| 98 | |
| 99 | foreach ($parts as $index => $part) { |
| 100 | if ($index !== $lastIndex) { |
| 101 | if (!isset($current[$part]) || !\is_array($current[$part])) { |
| 102 | $current[$part] = []; |
| 103 | } |
| 104 | $current = &$current[$part]; |
| 105 | |
| 106 | continue; |
| 107 | } |
| 108 | |
| 109 | if (isset($current[$part]) && \is_array($current[$part]) && \is_array($value)) { |
| 110 | $current[$part] = Util::mergeAssocArray($current[$part], $value, DataInterface::MERGE); |
| 111 | |
| 112 | continue; |
| 113 | } |
| 114 | |
| 115 | $current[$part] = $value; |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | return $normalized; |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * Flattens a nested configuration array into a dot-notated traversable set. |
| 124 | * |
| 125 | * This method SHALL recursively iterate through the nested array structure |
| 126 | * and convert it into a flat representation where keys reflect the nested path. |
| 127 | * |
| 128 | * For example: |
| 129 | * Input: ['database' => ['host' => 'localhost']] |
| 130 | * Output: ['database.host' => 'localhost'] |
| 131 | * |
| 132 | * @param array $config the configuration array to flatten |
| 133 | * @param string $rootKey (Optional) The root key prefix for recursive calls |
| 134 | * |
| 135 | * @return \Traversable<string, mixed> a traversable list of flattened key-value pairs |
| 136 | */ |
| 137 | public static function flatten(array $config, string $rootKey = ''): \Traversable |
| 138 | { |
| 139 | foreach ($config as $key => $value) { |
| 140 | if (\is_array($value)) { |
| 141 | yield from self::flatten($value, $rootKey . $key . '.'); |
| 142 | } else { |
| 143 | yield $rootKey . $key => $value; |
| 144 | } |
| 145 | } |
| 146 | } |
| 147 | } |