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<?php |
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/** |
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* League.Period (https://period.thephpleague.com) |
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* |
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* (c) Ignace Nyamagana Butera <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace League\Period\Chart; |
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use function in_array; |
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use function strtolower; |
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use function strtoupper; |
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final class RomanNumber implements LabelGenerator |
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{ |
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public const UPPER = 1; |
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public const LOWER = 2; |
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private const CHARACTER_MAP = [ |
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'M' => 1000, 'CM' => 900, 'D' => 500, |
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'CD' => 400, 'C' => 100, 'XC' => 90, |
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'L' => 50, 'XL' => 40, 'X' => 10, |
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'IX' => 9, 'V' => 5, 'IV' => 4, |
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'I' => 1, |
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]; |
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/** |
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* @var DecimalNumber |
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*/ |
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private $decimalNumber; |
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/** |
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* @var int |
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*/ |
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private $case; |
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/** |
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* New instance. |
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*/ |
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public function __construct(DecimalNumber $decimalNumber, int $case = self::UPPER) |
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{ |
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$this->decimalNumber = $decimalNumber; |
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$this->case = $this->filterLetterCase($case); |
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} |
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/** |
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* filter letter case state. |
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*/ |
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private function filterLetterCase(int $case): int |
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{ |
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if (!in_array($case, [self::UPPER, self::LOWER], true)) { |
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return self::UPPER; |
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} |
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return $case; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function generate(int $nbLabels): \Iterator |
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{ |
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foreach ($this->decimalNumber->generate($nbLabels) as $key => $label) { |
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yield $key => $this->convert($label); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function format(string $label): string |
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{ |
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if (self::UPPER === $this->case) { |
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return strtoupper($label); |
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} |
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return strtolower($label); |
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} |
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/** |
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* Convert a integer number into its roman representation. |
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* |
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* @see https://stackoverflow.com/a/15023547 |
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*/ |
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private function convert(string $number): string |
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{ |
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$retVal = ''; |
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while ($number > 0) { |
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foreach (self::CHARACTER_MAP as $roman => $int) { |
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if ($number >= $int) { |
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$number -= $int; |
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$retVal .= $roman; |
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break; |
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} |
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} |
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} |
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if (self::LOWER === $this->case) { |
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return strtolower($retVal); |
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} |
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return $retVal; |
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} |
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/** |
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* Returns the starting Letter. |
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*/ |
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public function startingAt(): int |
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{ |
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return $this->decimalNumber->startingAt(); |
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} |
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/** |
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* Tells whether the roman letter is upper cased. |
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*/ |
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public function isUpper(): bool |
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{ |
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return self::UPPER === $this->case; |
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} |
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/** |
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* Tells whether the roman letter is lower cased. |
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*/ |
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public function isLower(): bool |
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{ |
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return self::LOWER === $this->case; |
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} |
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/** |
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* Return an instance with the starting Letter. |
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* |
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* This method MUST retain the state of the current instance, and return |
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* an instance that contains the starting Letter. |
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*/ |
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public function startsWith(int $int): self |
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{ |
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$labelGenerator = $this->decimalNumber->startsWith($int); |
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if ($labelGenerator === $this->decimalNumber) { |
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return $this; |
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} |
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$clone = clone $this; |
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$clone->decimalNumber = $labelGenerator; |
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return $clone; |
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} |
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/** |
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* Return an instance with the new letter case setting. |
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* |
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* This method MUST retain the state of the current instance, and return |
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* an instance that contains the letter case setting. |
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*/ |
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public function withLetterCase(int $case): self |
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{ |
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$case = $this->filterLetterCase($case); |
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if ($case === $this->case) { |
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return $this; |
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} |
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$clone = clone $this; |
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$clone->case = $case; |
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return $clone; |
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} |
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} |
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thephpleague /
period
