added formatter

src/Formatter.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace WebChemistry\Invoice;
+
+class Formatter implements IFormatter {
+
+	const ENGLISH = 'en',
+		CZECH = 'cs';
+
+	/** @var array */
+	private static $options = [
+		'cs' => [
+			'number' => [
+				'dec' => ',',
+				'sep' => ' '
+			],
+			'money' => '%money %currency',
+			'date' => 'd.m.Y',
+		],
+		'en' => [
+			'number' => [
+				'dec' => NULL,
+				'sep' => NULL
+			],
+			'money' => '%currency %money',
+			'date' => 'd/m/Y',
+		],
+	];
+
+	/** @var string */
+	private $lang;
+
+	public function __construct($lang = self::ENGLISH) {
+		$this->lang = $lang;
+	}
+
+	public function formatNumber($float) {
+		return number_format($float, 2, self::$options[$this->lang]['number']['dec'], self::$options[$this->lang]['number']['sep']);
+	}
+
+	public function formatMoney($float, $currency) {
+		return strtr(self::$options[$this->lang]['money'], ['%money' => $this->formatNumber($float), '%currency' => $currency]);
+	}
+
+	public function formatDate(\DateTime $date) {
+		return $date->format(self::$options[$this->lang]['date']);
+	}
+
+}

src/IFormatter.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace WebChemistry\Invoice;
+
+interface IFormatter {
+
+	/**
+	 * @param float $float
+	 * @return string
+	 */
+	public function formatNumber($float);
+
+	/**
+	 * @param float $float
+	 * @param string $currency
+	 * @return string
+	 */
+	public function formatMoney($float, $currency);
+
+	/**
+	 * @param \DateTime $date
+	 * @return string
+	 */
+	public function formatDate(\DateTime $date);
+
+}