diff --git a/src/Symfony/Component/String/Inflector/SpanishInflector.php b/src/Symfony/Component/String/Inflector/SpanishInflector.php
new file mode 100644
index 0000000000000..4b98cb627bb15
--- /dev/null
+++ b/src/Symfony/Component/String/Inflector/SpanishInflector.php
@@ -0,0 +1,126 @@
+
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\String\Inflector;
+
+final class SpanishInflector implements InflectorInterface
+{
+ /**
+ * A list of all rules for pluralise.
+ *
+ * @see https://www.spanishdict.com/guide/spanish-plural-noun-forms
+ * @see https://www.rae.es/gram%C3%A1tica/morfolog%C3%ADa/la-formaci%C3%B3n-del-plural-plurales-en-s-y-plurales-en-es-reglas-generales
+ */
+ // First entry: regex
+ // Second entry: replacement
+ private const PLURALIZE_REGEXP = [
+ // Specials sí, no
+ ['/(sí|no)$/i', '\1es'],
+
+ // Words ending with vowel must use -s (RAE 3.2a, 3.2c)
+ ['/(a|e|i|o|u|á|é|í|ó|ú)$/i', '\1s'],
+
+ // Word ending in s or x and the previous letter is accented (RAE 3.2n)
+ ['/ás$/i', 'ases'],
+ ['/és$/i', 'eses'],
+ ['/ís$/i', 'ises'],
+ ['/ós$/i', 'oses'],
+ ['/ús$/i', 'uses'],
+
+ // Words ending in -ión must changed to -iones
+ ['/ión$/i', '\1iones'],
+
+ // Words ending in some consonants must use -es (RAE 3.2k)
+ ['/(l|r|n|d|j|s|x|ch|y)$/i', '\1es'],
+
+ // Word ending in z, must changed to ces
+ ['/(z)$/i', 'ces'],
+ ];
+
+ /**
+ * A list of all rules for singularize.
+ */
+ private const SINGULARIZE_REGEXP = [
+ // Specials sí, no
+ ['/(sí|no)es$/i', '\1'],
+
+ // Words ending in -ión must changed to -iones
+ ['/iones$/i', '\1ión'],
+
+ // Word ending in z, must changed to ces
+ ['/ces$/i', 'z'],
+
+ // Word ending in s or x and the previous letter is accented (RAE 3.2n)
+ ['/(\w)ases$/i', '\1ás'],
+ ['/eses$/i', 'és'],
+ ['/ises$/i', 'ís'],
+ ['/(\w{2,})oses$/i', '\1ós'],
+ ['/(\w)uses$/i', '\1ús'],
+
+ // Words ending in some consonants and -es, must be the consonants
+ ['/(l|r|n|d|j|s|x|ch|y)e?s$/i', '\1'],
+
+ // Words ended with vowel and s, must be vowel
+ ['/(a|e|i|o|u|á|é|ó|í|ú)s$/i', '\1'],
+ ];
+
+ private const UNINFLECTED_RULES = [
+ // Words ending with pies (RAE 3.2n)
+ '/.*(piés)$/i',
+ ];
+
+ private const UNINFLECTED = '/^(lunes|martes|miércoles|jueves|viernes|análisis|torax|yo|pies)$/i';
+
+ public function singularize(string $plural): array
+ {
+ if ($this->isInflectedWord($plural)) {
+ return [$plural];
+ }
+
+ foreach (self::SINGULARIZE_REGEXP as $rule) {
+ [$regexp, $replace] = $rule;
+
+ if (1 === preg_match($regexp, $plural)) {
+ return [preg_replace($regexp, $replace, $plural)];
+ }
+ }
+
+ return [$plural];
+ }
+
+ public function pluralize(string $singular): array
+ {
+ if ($this->isInflectedWord($singular)) {
+ return [$singular];
+ }
+
+ foreach (self::PLURALIZE_REGEXP as $rule) {
+ [$regexp, $replace] = $rule;
+
+ if (1 === preg_match($regexp, $singular)) {
+ return [preg_replace($regexp, $replace, $singular)];
+ }
+ }
+
+ return [$singular.'s'];
+ }
+
+ private function isInflectedWord(string $word): bool
+ {
+ foreach (self::UNINFLECTED_RULES as $rule) {
+ if (1 === preg_match($rule, $word)) {
+ return true;
+ }
+ }
+
+ return 1 === preg_match(self::UNINFLECTED, $word);
+ }
+}
diff --git a/src/Symfony/Component/String/Tests/Inflector/SpanishInflectorTest.php b/src/Symfony/Component/String/Tests/Inflector/SpanishInflectorTest.php
new file mode 100644
index 0000000000000..f0b8e4201684d
--- /dev/null
+++ b/src/Symfony/Component/String/Tests/Inflector/SpanishInflectorTest.php
@@ -0,0 +1,158 @@
+
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\String\Tests\Inflector;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\String\Inflector\SpanishInflector;
+
+class SpanishInflectorTest extends TestCase
+{
+ public static function singularizeProvider(): array
+ {
+ return [
+ // vowels (RAE 3.2a, 3.2c)
+ ['peras', 'pera'],
+ ['especies', 'especie'],
+ ['álcalis', 'álcali'],
+ ['códigos', 'código'],
+ ['espíritus', 'espíritu'],
+
+ // accented (RAE 3.2a, 3.2c)
+ ['papás', 'papá'],
+ ['cafés', 'café'],
+ ['isrealís', 'isrealí'],
+ ['burós', 'buró'],
+ ['tisús', 'tisú'],
+
+ // ending in -ión
+ ['aviones', 'avión'],
+ ['camiones', 'camión'],
+
+ // ending in some letters (RAE 3.2k)
+ ['amores', 'amor'],
+ ['antifaces', 'antifaz'],
+ ['atriles', 'atril'],
+ ['fácsimiles', 'fácsimil'],
+ ['vides', 'vid'],
+ ['reyes', 'rey'],
+ ['relojes', 'reloj'],
+ ['faxes', 'fax'],
+ ['sándwiches', 'sándwich'],
+ ['cánones', 'cánon'],
+
+ // (RAE 3.2n)
+ ['adioses', 'adiós'],
+ ['aguarrases', 'aguarrás'],
+ ['arneses', 'arnés'],
+ ['autobuses', 'autobús'],
+ ['kermeses', 'kermés'],
+ ['palmareses', 'palmarés'],
+ ['toses', 'tos'],
+
+ // Special
+ ['síes', 'sí'],
+ ['noes', 'no'],
+ ];
+ }
+
+ public static function pluralizeProvider(): array
+ {
+ return [
+ // vowels (RAE 3.2a, 3.2c)
+ ['pera', 'peras'],
+ ['especie', 'especies'],
+ ['álcali', 'álcalis'],
+ ['código', 'códigos'],
+ ['espíritu', 'espíritus'],
+
+ // accented (RAE 3.2a, 3.2c)
+ ['papá', 'papás'],
+ ['café', 'cafés'],
+ ['isrealí', 'isrealís'],
+ ['buró', 'burós'],
+ ['tisú', 'tisús'],
+
+ // ending in -ión
+ ['avión', 'aviones'],
+ ['camión', 'camiones'],
+
+ // ending in some letters (RAE 3.2k)
+ ['amor', 'amores'],
+ ['antifaz', 'antifaces'],
+ ['atril', 'atriles'],
+ ['fácsimil', 'fácsimiles'],
+ ['vid', 'vides'],
+ ['rey', 'reyes'],
+ ['reloj', 'relojes'],
+ ['fax', 'faxes'],
+ ['sándwich', 'sándwiches'],
+ ['cánon', 'cánones'],
+
+ // (RAE 3.2n)
+ ['adiós', 'adioses'],
+ ['aguarrás', 'aguarrases'],
+ ['arnés', 'arneses'],
+ ['autobús', 'autobuses'],
+ ['kermés', 'kermeses'],
+ ['palmarés', 'palmareses'],
+ ['tos', 'toses'],
+
+ // Specials
+ ['sí', 'síes'],
+ ['no', 'noes'],
+ ];
+ }
+
+ public static function uninflectedProvider(): array
+ {
+ return [
+ ['lunes'],
+ ['rodapiés'],
+ ['reposapiés'],
+ ['miércoles'],
+ ['pies'],
+ ];
+ }
+
+ /**
+ * @dataProvider singularizeProvider
+ */
+ public function testSingularize(string $plural, $singular)
+ {
+ $this->assertSame(
+ \is_array($singular) ? $singular : [$singular],
+ (new SpanishInflector())->singularize($plural)
+ );
+ }
+
+ /**
+ * @dataProvider pluralizeProvider
+ */
+ public function testPluralize(string $singular, $plural)
+ {
+ $this->assertSame(
+ \is_array($plural) ? $plural : [$plural],
+ (new SpanishInflector())->pluralize($singular)
+ );
+ }
+
+ /**
+ * @dataProvider uninflectedProvider
+ */
+ public function testUninflected(string $word)
+ {
+ $this->assertSame(
+ \is_array($word) ? $word : [$word],
+ (new SpanishInflector())->pluralize($word)
+ );
+ }
+}
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