add StringNormalizer

Author: MartkCz

src/StringNormalizer.php

@@ -0,0 +1,37 @@
+<?php declare(strict_types = 1);
+
+namespace Utilitte\Php;
+
+final class StringNormalizer
+{
+
+	/**
+	 * @var string[]
+	 * @copyright https://stackoverflow.com/a/12824140
+	 */
+	private static array $emojiRegexes = [
+		'\x{1F600}-\x{1F64F}', // emoticons,
+		'\x{1F300}-\x{1F5FF}', // miscellaneous, pictographs
+		'\x{1F680}-\x{1F6FF}', // transport, map symbols
+		'\x{2600}-\x{26FF}', // miscellaneous
+		'\x{2700}-\x{27BF}', // dingbats
+	];
+
+	public static function normalizeSpaces(string $str): string
+	{
+		return preg_replace('# {2,}#', ' ', trim($str));
+	}
+
+	public static function normalizeWhitespaces(string $str): string
+	{
+		$str = preg_replace('#[\r\n]+#', ' ', trim($str));
+
+		return preg_replace('#\s{2,}#', ' ', $str);
+	}
+
+	public static function normalizeEmoji(string $str): string
+	{
+		return trim(preg_replace(sprintf('#\s*[%s]+\s*#u', implode('', self::$emojiRegexes)), ' ', $str), ' ');
+	}
+
+}

tests/cases/stringNormalizer.phpt

@@ -0,0 +1,14 @@
+<?php declare(strict_types = 1);
+
+use Tester\Assert;
+use Utilitte\Php\StringNormalizer;
+
+require __DIR__ . '/../bootstrap.php';
+
+Assert::same('foo bar', StringNormalizer::normalizeEmoji('foo 🎓 bar'));
+Assert::same('foo', StringNormalizer::normalizeEmoji('foo 🎓'));
+Assert::same('foo bar', StringNormalizer::normalizeEmoji('foo🎓bar'));
+Assert::same('bar', StringNormalizer::normalizeEmoji('🎓bar'));
+
+Assert::same('foo bar', StringNormalizer::normalizeSpaces('foo     bar'));
+Assert::same('foo bar', StringNormalizer::normalizeWhitespaces("foo   \r  \n  bar"));