<?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\Inflector;

/**
* French inflector.
*
* This class does only inflect nouns; not adjectives nor composed words like "soixante-dix".
*/
final class FrenchInflector implements InflectorInterface
{
/**
* A list of all rules for pluralise.
*
* @see https://la-conjugaison.nouvelobs.com/regles/grammaire/le-pluriel-des-noms-121.php
*/
private const PLURALIZE_REGEXP = [
// First entry: regexp
// Second entry: replacement

// Words finishing with "s", "x" or "z" are invariables
// Les mots finissant par "s", "x" ou "z" sont invariables
['/(s|x|z)$/i', '\1'],

// Words finishing with "eau" are pluralized with a "x"
// Les mots finissant par "eau" prennent tous un "x" au pluriel
['/(eau)$/i', '\1x'],

// Words finishing with "au" are pluralized with a "x" excepted "landau"
// Les mots finissant par "au" prennent un "x" au pluriel sauf "landau"
['/^(landau)$/i', '\1s'],
['/(au)$/i', '\1x'],

// Words finishing with "eu" are pluralized with a "x" excepted "pneu", "bleu", "émeu"
// Les mots finissant en "eu" prennent un "x" au pluriel sauf "pneu", "bleu", "émeu"
['/^(pneu|bleu|émeu)$/i', '\1s'],
['/(eu)$/i', '\1x'],

// Words finishing with "al" are pluralized with a "aux" excepted
// Les mots finissant en "al" se terminent en "aux" sauf
['/^(bal|carnaval|caracal|chacal|choral|corral|étal|festival|récital|val)$/i', '\1s'],
['/al$/i', '\1aux'],

// Aspirail, bail, corail, émail, fermail, soupirail, travail, vantail et vitrail font leur pluriel en -aux
['/^(aspir|b|cor|ém|ferm|soupir|trav|vant|vitr)ail$/i', '\1aux'],

// Bijou, caillou, chou, genou, hibou, joujou et pou qui prennent un x au pluriel
['/^(bij|caill|ch|gen|hib|jouj|p)ou$/i', '\1oux'],

// Invariable words
['/^(cinquante|soixante|mille)$/i', '\1'],

// French titles
['/^(mon|ma)(sieur|dame|demoiselle|seigneur)$/', 'mes\2s'],
['/^(Mon|Ma)(sieur|dame|demoiselle|seigneur)$/', 'Mes\2s'],
];

/**
* A list of all rules for singularize.
*/
private const SINGULARIZE_REGEXP = [
// First entry: regexp
// Second entry: replacement

// Aspirail, bail, corail, émail, fermail, soupirail, travail, vantail et vitrail font leur pluriel en -aux
['/((aspir|b|cor|ém|ferm|soupir|trav|vant|vitr))aux$/i', '\1ail'],

// Words finishing with "eau" are pluralized with a "x"
// Les mots finissant par "eau" prennent tous un "x" au pluriel
['/(eau)x$/i', '\1'],

// Words finishing with "al" are pluralized with a "aux" expected
// Les mots finissant en "al" se terminent en "aux" sauf
['/(amir|anim|arsen|boc|can|capit|capor|chev|crist|génér|hopit|hôpit|idé|journ|littor|loc|m|mét|minér|princip|radic|termin)aux$/i', '\1al'],

// Words finishing with "au" are pluralized with a "x" excepted "landau"
// Les mots finissant par "au" prennent un "x" au pluriel sauf "landau"
['/(au)x$/i', '\1'],

// Words finishing with "eu" are pluralized with a "x" excepted "pneu", "bleu", "émeu"
// Les mots finissant en "eu" prennent un "x" au pluriel sauf "pneu", "bleu", "émeu"
['/(eu)x$/i', '\1'],

// Words finishing with "ou" are pluralized with a "s" excepted bijou, caillou, chou, genou, hibou, joujou, pou
// Les mots finissant par "ou" prennent un "s" sauf bijou, caillou, chou, genou, hibou, joujou, pou
['/(bij|caill|ch|gen|hib|jouj|p)oux$/i', '\1ou'],

// French titles
['/^mes(dame|demoiselle)s$/', 'ma\1'],
['/^Mes(dame|demoiselle)s$/', 'Ma\1'],
['/^mes(sieur|seigneur)s$/', 'mon\1'],
['/^Mes(sieur|seigneur)s$/', 'Mon\1'],

// Default rule
['/s$/i', ''],
];

/**
* A list of words which should not be inflected.
* This list is only used by singularize.
*/
private const UNINFLECTED = '/^(abcès|accès|abus|albatros|anchois|anglais|autobus|bois|brebis|carquois|cas|chas|colis|concours|corps|cours|cyprès|décès|devis|discours|dos|embarras|engrais|entrelacs|excès|fils|fois|gâchis|gars|glas|héros|intrus|jars|jus|kermès|lacis|legs|lilas|marais|mars|matelas|mépris|mets|mois|mors|obus|os|palais|paradis|parcours|pardessus|pays|plusieurs|poids|pois|pouls|printemps|processus|progrès|puits|pus|rabais|radis|recors|recours|refus|relais|remords|remous|rictus|rhinocéros|repas|rubis|sans|sas|secours|sens|souris|succès|talus|tapis|tas|taudis|temps|tiers|univers|velours|verglas|vernis|virus)$/i';

/**
* {@inheritdoc}
*/
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];
}

/**
* {@inheritdoc}
*/
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
{
return 1 === preg_match(self::UNINFLECTED, $word);
}
}