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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 provided as an array. |
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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 ArrayDigitList extends AbstractDigitList |
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{ |
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/** |
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* Creates a new instance of ArrayDigitList. |
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* |
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* The list of digits is provided as an array. The index provides value for |
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* the digits and the values provide the digits themselves. Any kind of |
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* value is an acceptable digit, but note that the digits are considered |
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* duplicate if their values are equal using a loose comparison. |
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* |
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* @param array $digits The list of digits for the numeral system |
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* @throws \InvalidArgumentException If the list of digits is invalid |
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*/ |
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public function __construct(array $digits) |
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{ |
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$this->validateDigits($digits); |
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$this->digits = $digits; |
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$mapped = array_map('strval', array_filter($digits, [$this, 'isMapped'])); |
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$this->valueMap = array_flip($mapped); |
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$this->stringConflict = count($mapped) === count($this->digits) |
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? $this->detectConflict($mapped, 'strpos') : true; |
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$this->caseSensitive = $this->detectConflict($mapped, 'stripos'); |
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if (!$this->caseSensitive) { |
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array_change_key_case($this->valueMap); |
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} |
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} |
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/** |
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* Validates and sorts the list of digits. |
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* @param array $digits The list of digits for the numeral system |
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* @throws \InvalidArgumentException If the digit list is invalid |
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*/ |
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private function validateDigits(& $digits) |
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{ |
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ksort($digits); |
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if (count($digits) < 2) { |
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throw new \InvalidArgumentException('Number base must have at least 2 digits'); |
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} elseif (array_keys($digits) !== range(0, count($digits) - 1)) { |
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throw new \InvalidArgumentException('Invalid digit values in the number base'); |
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} elseif ($this->detectDuplicates($digits)) { |
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throw new \InvalidArgumentException('Number base cannot have duplicate digits'); |
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} |
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} |
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/** |
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* Tells if the list of digits has duplicate values. |
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* @param array $digits The list of digits for the numeral system |
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* @return bool True if the list contains duplicate digits, false if not |
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*/ |
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private function detectDuplicates(array $digits) |
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{ |
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for ($i = count($digits); $i > 0; $i--) { |
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if (array_search(array_pop($digits), $digits) !== false) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* Tells if the digit can be mapped using a value map. |
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* @param mixed $digit The digit to test |
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* @return bool True if the digit can be mapped, false if not |
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*/ |
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private function isMapped($digit) |
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{ |
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return is_string($digit) || is_int($digit); |
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} |
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/** |
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* Tells if a conflict exists between string values. |
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* @param string[] $digits The list of digits for the numeral system |
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* @param callable $detect Function used to detect the conflict |
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* @return bool True if a conflict exists, false if not |
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*/ |
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private function detectConflict(array $digits, callable $detect) |
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{ |
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foreach ($digits as $digit) { |
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if ($this->inDigits($digit, $digits, $detect)) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* Tells if a conflict exists for a digit in a list of digits. |
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* @param string $digit A single digit to test |
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* @param string[] $digits The list of digits for the numeral system |
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* @param callable $detect Function used to detect the conflict |
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* @return bool True if a conflict exists, false if not |
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*/ |
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private function inDigits($digit, array $digits, callable $detect) |
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{ |
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foreach ($digits as $haystack) { |
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if ($digit !== $haystack && $detect($haystack, $digit) !== false) { |
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return true; |
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} |
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} |
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return false; |
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} |
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public function getValue($digit) |
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{ |
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if ($this->isMapped($digit)) { |
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return parent::getValue($digit); |
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} |
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$value = array_search($digit, $this->digits); |
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if ($value === false) { |
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throw new InvalidDigitException('Invalid digit'); |
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} |
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return $value; |
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} |
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} |
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Riimu /
Kit-BaseConversion
