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<?php |
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namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig; |
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use PhpOffice\PhpSpreadsheet\Calculation\ArrayEnabled; |
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use PhpOffice\PhpSpreadsheet\Calculation\Exception; |
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use PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError; |
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class Arabic |
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{ |
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use ArrayEnabled; |
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private const ROMAN_LOOKUP = [ |
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'M' => 1000, |
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'D' => 500, |
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'C' => 100, |
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'L' => 50, |
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'X' => 10, |
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'V' => 5, |
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'I' => 1, |
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]; |
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/** |
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* Recursively calculate the arabic value of a roman numeral. |
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* |
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* @param int $sum |
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* @param int $subtract |
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* |
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* @return int |
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*/ |
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private static function calculateArabic(array $roman, &$sum = 0, $subtract = 0) |
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{ |
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$numeral = array_shift($roman); |
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if (!isset(self::ROMAN_LOOKUP[$numeral])) { |
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throw new Exception('Invalid character detected'); |
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} |
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$arabic = self::ROMAN_LOOKUP[$numeral]; |
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if (count($roman) > 0 && isset(self::ROMAN_LOOKUP[$roman[0]]) && $arabic < self::ROMAN_LOOKUP[$roman[0]]) { |
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$subtract += $arabic; |
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} else { |
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$sum += ($arabic - $subtract); |
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$subtract = 0; |
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} |
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if (count($roman) > 0) { |
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self::calculateArabic($roman, $sum, $subtract); |
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} |
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return $sum; |
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} |
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/** |
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* ARABIC. |
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* |
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* Converts a Roman numeral to an Arabic numeral. |
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* |
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* Excel Function: |
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* ARABIC(text) |
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* |
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* @param mixed $roman Should be a string, or can be an array of strings |
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* |
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* @return array|int|string the arabic numberal contrived from the roman numeral |
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* If an array of numbers is passed as the argument, then the returned result will also be an array |
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* with the same dimensions |
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*/ |
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public static function evaluate(mixed $roman) |
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{ |
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if (is_array($roman)) { |
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return self::evaluateSingleArgumentArray([self::class, __FUNCTION__], $roman); |
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} |
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// An empty string should return 0 |
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$roman = substr(trim(strtoupper((string) $roman)), 0, 255); |
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if ($roman === '') { |
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return 0; |
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} |
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// Convert the roman numeral to an arabic number |
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$negativeNumber = $roman[0] === '-'; |
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if ($negativeNumber) { |
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$roman = substr($roman, 1); |
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} |
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try { |
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$arabic = self::calculateArabic(str_split($roman)); |
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} catch (Exception) { |
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return ExcelError::VALUE(); // Invalid character detected |
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} |
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if ($negativeNumber) { |
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$arabic *= -1; // The number should be negative |
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} |
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return $arabic; |
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} |
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} |
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PHPOffice /
PhpSpreadsheet
