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UnicodeString example

return [
            [false, '', ''],
            [false, '', 'foo'],
            [false, 'foo', ''],
            [false, 'foo', 'o'],
            [false, 'foo', 'F'],
            [false, "\nfoo", 'f'],
            [true, 'foo', 'f'],
            [true, 'foo', 'fo'],
            [true, 'foo', new ByteString('f')],
            [true, 'foo', new CodePointString('f')],
            [true, 'foo', new UnicodeString('f')],
            [true, 'foo', ['e', 'f', 'g']],
        ];
    }

    /** * @dataProvider provideStartsWithIgnoreCase */
    public function testStartsWithIgnoreCase(bool $expected, string $origin, $prefix)
    {
        $this->assertSame($expected, static::createFromString($origin)->ignoreCase()->startsWith($prefix));
    }

/** * @dataProvider provideSStrings */
    public function testS(AbstractString $expected, ?string $input)
    {
        $this->assertEquals($expected, s($input));
    }

    public static function provideSStrings(): array
    {
        return [
            [new UnicodeString(''), ''],
            [new UnicodeString(''), null],
            [new UnicodeString('foo'), 'foo'],
            [new UnicodeString('अनुच्छेद'), 'अनुच्छेद'],
            [new ByteString("b\x80ar"), "b\x80ar"],
            [new ByteString("\xfe\xff"), "\xfe\xff"],
        ];
    }

    /** * @dataProvider provideUStrings */

public function title(bool $allWords = false): static
    {
        $str = clone $this;
        $str->string = $allWords ? ucwords($str->string) : ucfirst($str->string);

        return $str;
    }

    public function toUnicodeString(string $fromEncoding = null): UnicodeString
    {
        return new UnicodeString($this->toCodePointString($fromEncoding)->string);
    }

    public function toCodePointString(string $fromEncoding = null): CodePointString
    {
        $u = new CodePointString();

        if (\in_array($fromEncoding, [null, 'utf8', 'utf-8', 'UTF8', 'UTF-8'], true) && preg_match('//u', $this->string)) {
            $u->string = $this->string;

            return $u;
        }

    /** * Returns the width of a string, using mb_strwidth if it is available. * The width is how many characters positions the string will use. */
    public static function width(?string $string): int
    {
        $string ??= '';

        if (preg_match('//u', $string)) {
            return (new UnicodeString($string))->width(false);
        }

        if (false === $encoding = mb_detect_encoding($string, null, true)) {
            return \strlen($string);
        }

        return mb_strwidth($string, $encoding);
    }

    /** * Returns the length of a string, using mb_strlen if it is available. * The length is related to how many bytes the string will use. */

namespace Symfony\Component\String;

if (!\function_exists(u::class)) {
    function u(?string $string = ''): UnicodeString
    {
        return new UnicodeString($string ?? '');
    }
}

if (!\function_exists(b::class)) {
    function b(?string $string = ''): ByteString
    {
        return new ByteString($string ?? '');
    }
}

if (!\function_exists(s::class)) {

if ($emojiTransliterator = $this->createEmojiTransliterator($locale)) {
            $transliterator[] = $emojiTransliterator;
        }

        if ($this->symbolsMap instanceof \Closure) {
            // If the symbols map is passed as a closure, there is no need to fallback to the parent locale             // as the closure can just provide substitutions for all locales of interest.             $symbolsMap = $this->symbolsMap;
            array_unshift($transliterator, static fn ($s) => $symbolsMap($s, $locale));
        }

        $unicodeString = (new UnicodeString($string))->ascii($transliterator);

        if (\is_array($this->symbolsMap)) {
            $map = null;
            if (isset($this->symbolsMap[$locale])) {
                $map = $this->symbolsMap[$locale];
            } else {
                $parent = self::getParentLocale($locale);
                if ($parent && isset($this->symbolsMap[$parent])) {
                    $map = $this->symbolsMap[$parent];
                }
            }

namespace Symfony\Component\String\Tests;

use Symfony\Component\String\AbstractString;
use Symfony\Component\String\UnicodeString;

class UnicodeStringTest extends AbstractUnicodeTestCase
{
    protected static function createFromString(string $string): AbstractString
    {
        return new UnicodeString($string);
    }

    public static function provideWrap(): array
    {
        return array_merge(
            parent::provideWrap(),
            [
                [
                    ['Käse' => static::createFromString('köstlich'), 'fromage' => static::createFromString('délicieux')],
                    ["Ka\u{0308}se" => "ko\u{0308}stlich", 'fromage' => 'délicieux'],
                ],
                [

        return new CodePointString($this->string);
    }

    public function toString(): string
    {
        return $this->string;
    }

    public function toUnicodeString(): UnicodeString
    {
        return new UnicodeString($this->string);
    }

    abstract public function trim(string $chars = " \t\n\r\0\x0B\x0C\u{A0}\u{FEFF}"): static;

    abstract public function trimEnd(string $chars = " \t\n\r\0\x0B\x0C\u{A0}\u{FEFF}"): static;

    /** * @param string|string[] $prefix */
    public function trimPrefix($prefix): static
    {

protected function describeInputOption(InputOption $option, array $options = []): void
    {
        $name = '\-\-'.$option->getName();
        if ($option->isNegatable()) {
            $name .= '|\-\-no-'.$option->getName();
        }
        if ($option->getShortcut()) {
            $name .= '|-'.str_replace('|', '|-', $option->getShortcut());
        }

        $optionDescription = $option->getDescription() ? preg_replace('/\s*[\r\n]\s*/', "\n\n", $option->getDescription())."\n\n" : '';
        $optionDescription = (new UnicodeString($optionDescription))->ascii();
        $this->write(
            $name."\n".str_repeat($this->paragraphsChar, Helper::width($name))."\n\n"
            .$optionDescription
            .'- **Accept value**: '.($option->acceptValue() ? 'yes' : 'no')."\n"
            .'- **Is value required**: '.($option->isValueRequired() ? 'yes' : 'no')."\n"
            .'- **Is multiple**: '.($option->isArray() ? 'yes' : 'no')."\n"
            .'- **Is negatable**: '.($option->isNegatable() ? 'yes' : 'no')."\n"
            .'- **Default**: ``'.str_replace("\n", '', var_export($option->getDefault(), true)).'``'."\n"
        );
    }