Italian Language Support (#17)

src/Speller.php

@@ -17,7 +17,8 @@ class Speller
 	const LANGUAGE_RUSSIAN = Language::RUSSIAN;
 	const LANGUAGE_SPANISH = Language::SPANISH;
 	const LANGUAGE_POLISH = Language::POLISH;
-
+	const LANGUAGE_ITALIAN = Language::ITALIAN;
+
 	const CURRENCY_EURO = 'EUR';
 	const CURRENCY_BRITISH_POUND = 'GBP';
 	const CURRENCY_LATVIAN_LAT = 'LVL';

src/languages/Italian.php

@@ -0,0 +1,174 @@
+<?php
+
+namespace js\tools\numbers2words\languages;
+
+use js\tools\numbers2words\exceptions\UnsupportedCurrencyException;
+use js\tools\numbers2words\Speller;
+
+/**
+ * @internal
+ */
+final class Italian extends Language
+{
+	public function spellMinus(): string
+	{
+		return 'meno';
+	}
+
+	public function spellMinorUnitSeparator(): string
+	{
+		return 'e';
+	}
+
+	public function spellHundred(int $number, int $groupOfThrees, bool $isDecimalPart, string $currency): string
+	{
+		static $tens = [
+			1 => 'dieci',
+			2 => 'venti',
+			3 => 'trenta',
+			4 => 'quaranta',
+			5 => 'cinquanta',
+			6 => 'sessanta',
+			7 => 'settanta',
+			8 => 'ottonta',
+			9 => 'novanta',
+		];
+		static $teens = [
+			11 => 'undici',
+			12 => 'dodici',
+			13 => 'tredici',
+			14 => 'quattordici',
+			15 => 'quindici',
+			16 => 'sedici',
+			17 => 'diciassette',
+			18 => 'diciotto',
+			19 => 'diciannove',
+		];
+		static $singles = [
+			0 => 'zero',
+			1 => 'uno',
+			2 => 'due',
+			3 => 'tre',
+			4 => 'quattro',
+			5 => 'cinque',
+			6 => 'sei',
+			7 => 'sette',
+			8 => 'otto',
+			9 => 'nove',
+		];
+
+		$text = '';
+
+		if ($number >= 100)
+		{
+			$firstDigit = intval(substr("$number", 0, 1));
+			if ($firstDigit === 1)
+			{
+				$text .= 'cento';
+			}
+			else
+			{
+				$text .= $singles[$firstDigit] . ' cento';
+			}
+
+			$number = $number % 100;
+
+			if ($number === 0) // exact hundreds
+			{
+				return $text;
+			}
+
+			$text .= ' ';
+		}
+
+		if ($number === 1 && $groupOfThrees > 1)
+		{
+			//$groupOfThrees === 2 is empty ...
+			if ($groupOfThrees === 3)
+			{
+				$text .= 'un';
+			}
+		}
+		else if ($number < 10)
+		{
+			$text .= $singles[$number];
+		}
+		else if (($number > 10) && ($number < 20))
+		{
+			$text .= $teens[$number];
+		}
+		else
+		{
+			$text .= $tens[intval(substr("$number", 0, 1))];
+
+			if ($number % 10 > 0)
+			{
+				$text .= ' ' . $singles[$number % 10];
+			}
+		}
+
+		return $text;
+	}
+
+	public function spellExponent(string $type, int $number, string $currency): string
+	{
+		if ($type === 'million')
+		{
+			if ($number === 1)
+			{
+				return 'milione';
+			}
+
+			return 'milioni';
+		}
+
+		if ($type === 'thousand')
+		{
+			if ($number === 1)
+			{
+				return 'mille';
+			}
+
+			return 'mila';
+		}
+
+		return '';
+	}
+
+	public function getCurrencyNameMajor(int $amount, string $currency): string
+	{
+		static $names = [
+			Speller::CURRENCY_EURO           => ['euro', 'euro'],
+			Speller::CURRENCY_BRITISH_POUND  => ['sterlina', 'sterline'],
+			Speller::CURRENCY_LATVIAN_LAT    => ['lats', 'lats'],
+			Speller::CURRENCY_LITHUANIAN_LIT => ['litas', 'litas'],
+			Speller::CURRENCY_RUSSIAN_ROUBLE => ['rublo', 'rubli'],
+			Speller::CURRENCY_US_DOLLAR      => ['dollaro', 'dollari'],
+			Speller::CURRENCY_PL_ZLOTY       => ['zloty', 'zlote'],
+		];
+
+		return self::getCurrencyName($names, $amount, $currency);
+	}
+
+	public function getCurrencyNameMinor(int $amount, string $currency): string
+	{
+		static $names = [
+			Speller::CURRENCY_EURO           => ['centesimo', 'centesimi'],
+			Speller::CURRENCY_BRITISH_POUND  => ['penny', 'pennies'],
+			Speller::CURRENCY_LATVIAN_LAT    => ['santim', 'santims'],
+			Speller::CURRENCY_LITHUANIAN_LIT => ['centas', 'centai'],
+			Speller::CURRENCY_RUSSIAN_ROUBLE => ['copeche', 'copechi'],
+			Speller::CURRENCY_US_DOLLAR      => ['centesimo', 'centesimi'],
+			Speller::CURRENCY_PL_ZLOTY       => ['grosz', 'groszy'],
+		];
+
+		return self::getCurrencyName($names, $amount, $currency);
+	}
+
+	private static function getCurrencyName(array $names, int $amount, string $currency): string
+	{
+		$index = (($amount === 1) ? 0 : 1);
+
+		return $names[$currency][$index] ?? self::throw(new UnsupportedCurrencyException($currency));
+	}
+}

src/languages/Language.php

@@ -16,7 +16,8 @@ abstract class Language
 	public const RUSSIAN = 'ru';
 	public const SPANISH = 'es';
 	public const POLISH = 'pl';
-
+	public const ITALIAN = 'it';
+
 	private const SUPPORTED_LANGUAGE_CLASSES = [
 		self::ENGLISH    => English::class,
 		self::ESTONIAN   => Estonian::class,
@@ -25,6 +26,7 @@ abstract class Language
 		self::RUSSIAN    => Russian::class,
 		self::SPANISH    => Spanish::class,
 		self::POLISH     => Polish::class,
+		self::ITALIAN    => Italian::class,
 	];
 
 	/**