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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * @license MIT |
| 5 | * @author hazuki3417<hazuki3417@gmail.com> |
| 6 | * @copyright 2021 hazuki3417 all rights reserved. |
| 7 | */ |
| 8 | |
| 9 | namespace Selen\Str; |
| 10 | |
| 11 | use Selen\Verify\Str\Radixes\Radix; |
| 12 | |
| 13 | class Alphabet |
| 14 | { |
| 15 | /** |
| 16 | * アルファベットの文字数. |
| 17 | */ |
| 18 | public const NUMBER = 26; |
| 19 | |
| 20 | /** |
| 21 | * アルファベット大文字の開始位置（ASCIIコード）. |
| 22 | */ |
| 23 | public const UPPER_CASE_ASCII_CODE = 65; |
| 24 | |
| 25 | /** |
| 26 | * アルファベット小文字の開始位置（ASCIIコード）. |
| 27 | */ |
| 28 | public const LOWER_CASE_ASCII_CODE = 97; |
| 29 | |
| 30 | /** |
| 31 | * 26進数指定でアルファベット（小文字）を取得するメソッド（a-z:0-p）. |
| 32 | */ |
| 33 | public static function getLowerCase26Ary(string $val): string |
| 34 | { |
| 35 | if (!Radix::verify($val, self::NUMBER)) { |
| 36 | throw new \InvalidArgumentException( |
| 37 | 'Please specify in 26-ary format.' |
| 38 | ); |
| 39 | } |
| 40 | |
| 41 | $asciiCodeDiff = base_convert($val, self::NUMBER, 10); |
| 42 | |
| 43 | if (!self::isValidDiffAsciiCode((int) $asciiCodeDiff)) { |
| 44 | throw new \RuntimeException( |
| 45 | 'Specify the value within the range of 1 digit of the 26-ary number.' |
| 46 | ); |
| 47 | } |
| 48 | |
| 49 | /** @phpstan-ignore-next-line */ |
| 50 | $asciiCode = self::LOWER_CASE_ASCII_CODE + $asciiCodeDiff; |
| 51 | |
| 52 | return chr($asciiCode); |
| 53 | } |
| 54 | |
| 55 | /** |
| 56 | * 26進数指定でアルファベット（大文字）を取得するメソッド（a-z:0-p）. |
| 57 | */ |
| 58 | public static function getUpperCase26Ary(string $val): string |
| 59 | { |
| 60 | if (!Radix::verify($val, self::NUMBER)) { |
| 61 | throw new \InvalidArgumentException( |
| 62 | 'Please specify in 26-ary format.' |
| 63 | ); |
| 64 | } |
| 65 | |
| 66 | $asciiCodeDiff = base_convert($val, self::NUMBER, 10); |
| 67 | |
| 68 | if (!self::isValidDiffAsciiCode((int) $asciiCodeDiff)) { |
| 69 | throw new \RuntimeException( |
| 70 | 'Specify the value within the range of 1 digit of the 26-ary number.' |
| 71 | ); |
| 72 | } |
| 73 | |
| 74 | /** @phpstan-ignore-next-line */ |
| 75 | $asciiCode = self::UPPER_CASE_ASCII_CODE + $asciiCodeDiff; |
| 76 | |
| 77 | return chr($asciiCode); |
| 78 | } |
| 79 | |
| 80 | private static function isValidDiffAsciiCode(int $val): bool |
| 81 | { |
| 82 | $alphaNumRangeMin = 0; |
| 83 | $alphaNumRangeMax = self::NUMBER; |
| 84 | |
| 85 | return $alphaNumRangeMin <= $val && $val < $alphaNumRangeMax; |
| 86 | } |
| 87 | } |