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<?php |
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namespace Riimu\Kit\BaseConversion\DigitList; |
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/** |
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* Handles a list of digits defined according to number base. |
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* @author Riikka Kalliomäki <[email protected]> |
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* @copyright Copyright (c) 2015-2017 Riikka Kalliomäki |
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* @license http://opensource.org/licenses/mit-license.php MIT License |
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*/ |
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class IntegerDigitList extends AbstractDigitList |
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{ |
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/** @var string List of digits for bases smaller than 63 */ |
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private static $integerBase = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'; |
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/** @var string List of digits for base 64 */ |
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private static $integerBase64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'; |
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/** |
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* Creates a new instance of IntegerDigitList. |
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* |
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* The digit list is defined by giving the radix (i.e. base) for the number |
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* system that defines the number of digits in the digit list. The actual |
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* digits are determined based on the given number. |
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* |
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* If the given radix is 62 or less, the digits from the list 0-9A-Za-z |
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* are used. The digits are case insensitive, if the radix is 36 or less. |
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* |
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* If the radix is 64, then the digits from the base64 standard are used. |
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* Base64 is always case sensitive. |
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* |
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* If the radix is 63 or 65 to 256, then digits are represented by a single |
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* byte with equal byte value. |
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* |
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* If the radix is 257 or greater, then each digit is represented by a |
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* string of #NNN (where NNN is the value of the digit). Each string has |
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* equal length, which depends on the given radix. |
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* |
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* @param int $radix Radix for the numeral system |
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* @throws \InvalidArgumentException If the radix is invalid |
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*/ |
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public function __construct($radix) |
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{ |
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$radix = (int) $radix; |
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if ($radix < 2) { |
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throw new \InvalidArgumentException('Invalid radix'); |
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} |
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$this->digits = $this->buildDigitList($radix); |
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$this->stringConflict = false; |
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$this->setValueMap(array_flip($this->digits)); |
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} |
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/** |
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* Builds the list of digits according to the radix. |
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* @param int $radix Radix for the numeral system |
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* @return string[] The list of digits |
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*/ |
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private function buildDigitList($radix) |
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{ |
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if ($radix <= strlen(self::$integerBase)) { |
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return str_split(substr(self::$integerBase, 0, $radix)); |
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} elseif ($radix === 64) { |
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return str_split(self::$integerBase64); |
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} elseif ($radix <= 256) { |
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return range(chr(0), chr($radix - 1)); |
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} |
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return $this->buildArbitraryList($radix); |
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} |
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/** |
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* Builds the list of digits for arbitrary radix. |
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* @param int $radix Radix for the numeral system |
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* @return string[] The list of digits |
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*/ |
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private function buildArbitraryList($radix) |
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{ |
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$format = '#%0' . strlen($radix - 1) . 'd'; |
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return array_map(function ($value) use ($format) { |
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return sprintf($format, $value); |
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}, range(0, $radix - 1)); |
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} |
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} |
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Riimu /
Kit-BaseConversion
