AsciiSlugger.php
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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\String\Slugger;
use Symfony\Component\String\AbstractUnicodeString;
use Symfony\Component\String\UnicodeString;
use Symfony\Contracts\Translation\LocaleAwareInterface;
if (!interface_exists(LocaleAwareInterface::class)) {
throw new \LogicException('You cannot use the "Symfony\Component\String\Slugger\AsciiSlugger" as the "symfony/translation-contracts" package is not installed. Try running "composer require symfony/translation-contracts".');
}
/**
* @author Titouan Galopin <galopintitouan@gmail.com>
*/
class AsciiSlugger implements SluggerInterface, LocaleAwareInterface
{
private const LOCALE_TO_TRANSLITERATOR_ID = [
'am' => 'Amharic-Latin',
'ar' => 'Arabic-Latin',
'az' => 'Azerbaijani-Latin',
'be' => 'Belarusian-Latin',
'bg' => 'Bulgarian-Latin',
'bn' => 'Bengali-Latin',
'de' => 'de-ASCII',
'el' => 'Greek-Latin',
'fa' => 'Persian-Latin',
'he' => 'Hebrew-Latin',
'hy' => 'Armenian-Latin',
'ka' => 'Georgian-Latin',
'kk' => 'Kazakh-Latin',
'ky' => 'Kirghiz-Latin',
'ko' => 'Korean-Latin',
'mk' => 'Macedonian-Latin',
'mn' => 'Mongolian-Latin',
'or' => 'Oriya-Latin',
'ps' => 'Pashto-Latin',
'ru' => 'Russian-Latin',
'sr' => 'Serbian-Latin',
'sr_Cyrl' => 'Serbian-Latin',
'th' => 'Thai-Latin',
'tk' => 'Turkmen-Latin',
'uk' => 'Ukrainian-Latin',
'uz' => 'Uzbek-Latin',
'zh' => 'Han-Latin',
];
private $defaultLocale;
private $symbolsMap = [
'en' => ['@' => 'at', '&' => 'and'],
];
/**
* Cache of transliterators per locale.
*
* @var \Transliterator[]
*/
private $transliterators = [];
/**
* @param array|\Closure|null $symbolsMap
*/
public function __construct(string $defaultLocale = null, $symbolsMap = null)
{
if (null !== $symbolsMap && !\is_array($symbolsMap) && !$symbolsMap instanceof \Closure) {
throw new \TypeError(sprintf('Argument 2 passed to "%s()" must be array, Closure or null, "%s" given.', __METHOD__, \gettype($symbolsMap)));
}
$this->defaultLocale = $defaultLocale;
$this->symbolsMap = $symbolsMap ?? $this->symbolsMap;
}
/**
* {@inheritdoc}
*/
public function setLocale($locale)
{
$this->defaultLocale = $locale;
}
/**
* {@inheritdoc}
*/
public function getLocale()
{
return $this->defaultLocale;
}
/**
* {@inheritdoc}
*/
public function slug(string $string, string $separator = '-', string $locale = null): AbstractUnicodeString
{
$locale = $locale ?? $this->defaultLocale;
$transliterator = [];
if ($locale && ('de' === $locale || 0 === strpos($locale, 'de_'))) {
// Use the shortcut for German in UnicodeString::ascii() if possible (faster and no requirement on intl)
$transliterator = ['de-ASCII'];
} elseif (\function_exists('transliterator_transliterate') && $locale) {
$transliterator = (array) $this->createTransliterator($locale);
}
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 function ($s) use ($symbolsMap, $locale) {
return $symbolsMap($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];
}
}
if ($map) {
foreach ($map as $char => $replace) {
$unicodeString = $unicodeString->replace($char, ' '.$replace.' ');
}
}
}
return $unicodeString
->replaceMatches('/[^A-Za-z0-9]++/', $separator)
->trim($separator)
;
}
private function createTransliterator(string $locale): ?\Transliterator
{
if (\array_key_exists($locale, $this->transliterators)) {
return $this->transliterators[$locale];
}
// Exact locale supported, cache and return
if ($id = self::LOCALE_TO_TRANSLITERATOR_ID[$locale] ?? null) {
return $this->transliterators[$locale] = \Transliterator::create($id.'/BGN') ?? \Transliterator::create($id);
}
// Locale not supported and no parent, fallback to any-latin
if (!$parent = self::getParentLocale($locale)) {
return $this->transliterators[$locale] = null;
}
// Try to use the parent locale (ie. try "de" for "de_AT") and cache both locales
if ($id = self::LOCALE_TO_TRANSLITERATOR_ID[$parent] ?? null) {
$transliterator = \Transliterator::create($id.'/BGN') ?? \Transliterator::create($id);
}
return $this->transliterators[$locale] = $this->transliterators[$parent] = $transliterator ?? null;
}
private static function getParentLocale(?string $locale): ?string
{
if (!$locale) {
return null;
}
if (false === $str = strrchr($locale, '_')) {
// no parent locale
return null;
}
return substr($locale, 0, -\strlen($str));
}
}