NumberToWordTranslator.php

<?php declare(strict_types = 1);

namespace Slevomat\Number;

class NumberToWordTranslator extends \Consistence\Object
{

	public function translate(int $number): string
	{
		$word = $this->translateSpecial($number);
		if ($word !== null) {
			return $word;
		}

		$number = (string) $number;
		$magnitudes = strlen($number);
		$word = '';
		for ($magnitude = $magnitudes; $magnitude > 0; $magnitude--) {
			$wordPart = $this->translateMagnitude($magnitude, (int) $number[$magnitudes - $magnitude]);
			if ($magnitude < $magnitudes) {
				$wordPart = \Nette\Utils\Strings::lower($wordPart);
			}
			$word .= $wordPart;
		}

		return $word;
	}

	/**
	 * @param int $number
	 * @return string|null
	 */
	private function translateSpecial(int $number)
	{
		switch ($number) {
			case 11:
				return _('Jedenáct');
			case 12:
				return _('Dvanáct');
			case 13:
				return _('Třináct');
			case 14:
				return _('Čtrnáct');
			case 15:
				return _('Patnáct');
			case 16:
				return _('Šestnáct');
			case 17:
				return _('Sedmnáct');
			case 18:
				return _('Osmnáct');
			case 19:
				return _('Devatenáct');
			default:
				return null;
		}
	}

	private function translateMagnitude(int $magnitude, int $digit): string
	{
		switch ($magnitude) {
			case 1:
				return $this->translateFirstMagnitude($digit);
			case 2:
				return $this->translateSecondMagnitude($digit);
			default:
				throw new \Slevomat\Number\NotImplementedException();
		}
	}

	private function translateFirstMagnitude(int $digit): string
	{
		switch ($digit) {
			case 1:
				return _('Jedna');
			case 2:
				return _('Dva');
			case 3:
				return _('Tři');
			case 4:
				return _('Čtyři');
			case 5:
				return _('Pět');
			case 6:
				return _('Šest');
			case 7:
				return _('Sedm');
			case 8:
				return _('Osm');
			case 9:
				return _('Devět');
			default:
				throw new \LogicException();
		}
	}

	private function translateSecondMagnitude(int $digit): string
	{
		switch ($digit) {
			case 1:
				return _('Deset');
			case 2:
				return _('Dvacet');
			case 3:
				return _('Třicet');
			case 4:
				return _('Čtyřicet');
			case 5:
				return _('Padesát');
			case 6:
				return _('Šedesát');
			case 7:
				return _('Sedmdesát');
			case 8:
				return _('Osmdesát');
			case 9:
				return _('Devadesát');
			default:
				throw new \LogicException();
		}
	}

}