Draft: Add Support for Switzerland

lang/switzerland/de/holidays.json

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+{
+    "Neujahr": "Neujahr",
+    "Berchtoldstag": "Berchtoldstag",
+    "Heilige Drei Könige": "Heilige Drei Könige",
+    "Josefstag": "Josefstag",
+    "Karfreitag": "Karfreitag",
+    "Ostermontag": "Ostermontag",
+    "Tag der Arbeit": "Tag der Arbeit",
+    "Auffahrt": "Auffahrt",
+    "Pfingstmontag": "Pfingstmontag",
+    "Fronleichnam": "Fronleichnam",
+    "Bundesfeier": "Bundesfeier",
+    "Maria Himmelfahrt": "Maria Himmelfahrt",
+    "Allerheiligen": "Allerheiligen",
+    "Maria Empfängnis": "Maria Empfängnis",
+    "Weihnachtstag": "Weihnachtstag",
+    "Stephanstag": "Stephanstag"
+}

lang/switzerland/fr/holidays.json

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+{
+    "Neujahr": "Nouvel An",
+    "Berchtoldstag": "Saint-Berthold",
+    "Heilige Drei Könige": "Épiphanie",
+    "Josefstag": "Saint-Joseph",
+    "Karfreitag": "Vendredi saint",
+    "Ostermontag": "Lundi de Pâques",
+    "Tag der Arbeit": "Fête du travail",
+    "Auffahrt": "Ascension",
+    "Pfingstmontag": "Lundi de Pentecôte",
+    "Fronleichnam": "Fête-Dieu",
+    "Bundesfeier": "Fête nationale",
+    "Maria Himmelfahrt": "Assomption",
+    "Allerheiligen": "Toussaint",
+    "Maria Empfängnis": "Immaculée Conception",
+    "Weihnachtstag": "Noël",
+    "Stephanstag": "Saint-Étienne"
+}

lang/switzerland/it/holidays.json

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+{
+    "Neujahr": "Capodanno",
+    "Berchtoldstag": "San Silvestro",
+    "Heilige Drei Könige": "Epifania",
+    "Josefstag": "San Giuseppe",
+    "Karfreitag": "Venerdì Santo",
+    "Ostermontag": "Lunedì di Pasqua",
+    "Tag der Arbeit": "Festa del lavoro",
+    "Auffahrt": "Ascensione",
+    "Pfingstmontag": "Lunedì di Pentecoste",
+    "Fronleichnam": "Corpus Domini",
+    "Bundesfeier": "Festa nazionale",
+    "Maria Himmelfahrt": "Assunzione",
+    "Allerheiligen": "Ognissanti",
+    "Maria Empfängnis": "Immacolata Concezione",
+    "Weihnachtstag": "Natale",
+    "Stephanstag": "Santo Stefano"
+}

src/Countries/Switzerland.php

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+<?php
+
+namespace Spatie\Holidays\Countries;
+
+use Carbon\CarbonImmutable;
+use Spatie\Holidays\Exceptions\InvalidRegion;
+
+class Switzerland extends Country
+{
+    private const REGIONS = [
+        'ch-ag',
+        'ch-ar',
+        'ch-ai',
+        'ch-bl',
+        'ch-bs',
+        'ch-be',
+        'ch-fr',
+        'ch-ge',
+        'ch-gl',
+        'ch-gr',
+        'ch-ju',
+        'ch-lu',
+        'ch-ne',
+        'ch-nw',
+        'ch-ow',
+        'ch-sh',
+        'ch-sz',
+        'ch-so',
+        'ch-sg',
+        'ch-ti',
+        'ch-tg',
+        'ch-ur',
+        'ch-vd',
+        'ch-vs',
+        'ch-zg',
+        'ch-zh',
+    ];
+
+    private const NEW_YEAR = 'Neujahr';
+
+    private const SECOND_JANUARY = 'Berchtoldstag';
+
+    private const THREE_KINGS = 'Heilige Drei Könige';
+
+    private const DAY_OF_JOSEPH = 'Josefstag';
+
+    private const GOOD_FRIDAY = 'Karfreitag';
+
+    private const EASTER_MONDAY = 'Ostermontag';
+
+    private const LABOR_DAY = 'Tag der Arbeit';
+
+    private const ASCENSION_DAY = 'Auffahrt';
+
+    private const WHIT_MONDAY = 'Pfingstmontag';
+
+    private const CORPUS_CHRISTI = 'Fronleichnam';
+
+    private const FEDERAL_CELEBRATION = 'Bundesfeier';
+
+    private const ASSUMPTION_DAY = 'Maria Himmelfahrt';
+
+    private const ALL_SAINTS_DAY = 'Allerheiligen';
+
+    private const IMMACULATE_CONCEPTION = 'Maria Empfängnis';
+
+    private const CHRISTMAS_DAY = 'Weihnachtstag';
+
+    private const ST_STEPHENS_DAY = 'Stephanstag';
+
+    public function __construct(protected ?string $region = null)
+    {
+        if ($region !== null && !in_array($region, self::REGIONS)) {
+            throw InvalidRegion::unsupportedRegion($region);
+        }
+    }
+
+    public function countryCode(): string
+    {
+        return 'ch';
+    }
+
+    /**
+     * @return array<string, CarbonImmutable|string>
+     */
+    public function regionalHolidays(int $year): array
+    {
+        if ($this->region === null) {
+            return [];
+        }
+
+        $easter = $this->easter($year);
+
+        $sharedHolidays = [
+            self::NEW_YEAR => '01-01',
+            self::ASCENSION_DAY => $easter->addDays(39),
+            self::FEDERAL_CELEBRATION => '08-01',
+            self::CHRISTMAS_DAY => '12-25',
+        ];
+
+        $regionallyDifferentHolidays = [
+            self::SECOND_JANUARY => '01-02',
+            self::THREE_KINGS => '01-06',
+            self::DAY_OF_JOSEPH => '03-19',
+            self::GOOD_FRIDAY => $easter->subDays(2),
+            self::EASTER_MONDAY => $easter->addDay(),
+            self::LABOR_DAY => '05-01',
+            self::WHIT_MONDAY => $easter->addDays(50),
+            self::CORPUS_CHRISTI => $easter->addDays(60),
+            self::ASSUMPTION_DAY => '08-15',
+            self::ALL_SAINTS_DAY => '11-01',
+            self::IMMACULATE_CONCEPTION => '12-08',
+            self::ST_STEPHENS_DAY => '12-26',
+        ];
+
+        $currentRegion = match($this->region) {
+            'ch-ag' => [
+                self::GOOD_FRIDAY,
+            ],
+            'ch-ar' => [
+                self::GOOD_FRIDAY,
+                self::EASTER_MONDAY,
+                self::WHIT_MONDAY,
+                self::ST_STEPHENS_DAY,
+            ],
+            'ch-ai' => [
+                self::GOOD_FRIDAY,
+                self::EASTER_MONDAY,
+                self::WHIT_MONDAY,
+                self::CORPUS_CHRISTI,
+                self::ST_STEPHENS_DAY,
+            ],
+            'ch-bl' => [
+                self::GOOD_FRIDAY,
+                self::EASTER_MONDAY,
+                self::LABOR_DAY,
+                self::WHIT_MONDAY,
+                self::ST_STEPHENS_DAY,
+            ],
+            'ch-bs' => [
+                self::GOOD_FRIDAY,
+                self::EASTER_MONDAY,
+                self::LABOR_DAY,
+                self::WHIT_MONDAY,
+                self::ST_STEPHENS_DAY,
+            ],
+            'ch-be' => [
+                self::SECOND_JANUARY,
+                self::GOOD_FRIDAY,
+                self::EASTER_MONDAY,
+                self::WHIT_MONDAY,
+                self::ST_STEPHENS_DAY,
+            ],
+            'ch-fr' => [
+                self::GOOD_FRIDAY,
+            ],
+            'ch-ge' => [
+                self::GOOD_FRIDAY,
+                self::EASTER_MONDAY,
+                self::WHIT_MONDAY,
+            ],
+            'ch-gl' => [
+                self::GOOD_FRIDAY,
+                self::EASTER_MONDAY,
+                self::ALL_SAINTS_DAY,
+                self::IMMACULATE_CONCEPTION,
+            ],
+            'ch-gr' => [
+                self::GOOD_FRIDAY,
+                self::EASTER_MONDAY,
+                self::WHIT_MONDAY,
+                self::ST_STEPHENS_DAY,
+            ],
+            'ch-ju' => [
+                self::GOOD_FRIDAY,
+                self::EASTER_MONDAY,
+                self::LABOR_DAY,
+                self::WHIT_MONDAY,
+                self::CORPUS_CHRISTI,
+            ],
+            'ch-lu' => [
+                self::GOOD_FRIDAY,
+                self::CORPUS_CHRISTI,
+                self::ASSUMPTION_DAY,
+                self::ALL_SAINTS_DAY,
+                self::ST_STEPHENS_DAY,
+            ],
+            'ch-ne' => [
+                self::GOOD_FRIDAY,
+                self::LABOR_DAY,
+            ],
+            'ch-nw' => [
+                self::GOOD_FRIDAY,
+                self::CORPUS_CHRISTI,
+                self::ASSUMPTION_DAY,
+                self::ALL_SAINTS_DAY,
+                self::IMMACULATE_CONCEPTION,
+            ],
+            'ch-ow' => [
+                self::GOOD_FRIDAY,
+                self::CORPUS_CHRISTI,
+                self::ASSUMPTION_DAY,
+                self::ALL_SAINTS_DAY,
+                self::IMMACULATE_CONCEPTION,
+            ],
+            'ch-sh' => [
+                self::GOOD_FRIDAY,
+                self::EASTER_MONDAY,
+                self::WHIT_MONDAY,
+                self::ST_STEPHENS_DAY,
+            ],
+            'ch-sz' => [
+                self::DAY_OF_JOSEPH,
+                self::GOOD_FRIDAY,
+                self::CORPUS_CHRISTI,
+                self::ASSUMPTION_DAY,
+                self::ALL_SAINTS_DAY,
+            ],
+            'ch-so' => [
+                self::GOOD_FRIDAY,
+            ],
+            'ch-sg' => [
+                self::GOOD_FRIDAY,
+                self::EASTER_MONDAY,
+                self::WHIT_MONDAY,
+                self::ALL_SAINTS_DAY,
+                self::ST_STEPHENS_DAY,
+            ],
+            'ch-ti' => [
+                self::THREE_KINGS,
+                self::EASTER_MONDAY,
+                self::ASSUMPTION_DAY,
+                self::ALL_SAINTS_DAY,
+                self::ST_STEPHENS_DAY,
+            ],
+            'ch-tg' => [
+                self::SECOND_JANUARY,
+                self::GOOD_FRIDAY,
+                self::EASTER_MONDAY,
+                self::WHIT_MONDAY,
+                self::ST_STEPHENS_DAY,
+            ],
+            'ch-ur' => [
+                self::GOOD_FRIDAY,
+                self::CORPUS_CHRISTI,
+                self::ASSUMPTION_DAY,
+                self::ALL_SAINTS_DAY,
+                self::IMMACULATE_CONCEPTION,
+            ],
+            'ch-vd' => [
+                self::SECOND_JANUARY,
+                self::GOOD_FRIDAY,
+                self::EASTER_MONDAY,
+                self::WHIT_MONDAY,
+            ],
+            'ch-vs' => [
+                self::DAY_OF_JOSEPH,
+                self::CORPUS_CHRISTI,
+                self::ASSUMPTION_DAY,
+                self::ALL_SAINTS_DAY,
+                self::IMMACULATE_CONCEPTION,
+            ],
+            'ch-zg' => [
+                self::GOOD_FRIDAY,
+                self::CORPUS_CHRISTI,
+                self::ASSUMPTION_DAY,
+                self::ALL_SAINTS_DAY,
+                self::IMMACULATE_CONCEPTION,
+            ],
+            'ch-zh' => [
+                self::GOOD_FRIDAY,
+                self::EASTER_MONDAY,
+                self::LABOR_DAY,
+                self::WHIT_MONDAY,
+                self::ST_STEPHENS_DAY,
+            ],
+            default => [],
+        };
+
+        $regionalHolidays = array_filter(
+            $regionallyDifferentHolidays,
+            fn ($key) => in_array($key, $currentRegion),
+            ARRAY_FILTER_USE_KEY
+        );
+
+        return array_merge($regionalHolidays, $sharedHolidays);
+    }
+
+    protected function allHolidays(int $year): array
+    {
+        if($this->region !== null) {
+            return $this->regionalHolidays($year);
+        }
+
+        return array_merge([
+            self::NEW_YEAR => '01-01',
+            self::SECOND_JANUARY => '01-02',
+            self::FEDERAL_CELEBRATION => '08-01',
+            self::CHRISTMAS_DAY => '12-25',
+            self::ST_STEPHENS_DAY => '12-26',
+        ], $this->variableHolidays($year));
+    }
+
+    /** @return array<string, CarbonImmutable> */
+    protected function variableHolidays(int $year): array
+    {
+        $easter = $this->easter($year);
+
+        return [
+            self::GOOD_FRIDAY => $easter->subDays(2),
+            self::EASTER_MONDAY => $easter->addDay(),
+            self::ASCENSION_DAY => $easter->addDays(39),
+            self::WHIT_MONDAY => $easter->addDays(50),
+        ];
+    }
+}

src/Exceptions/InvalidRegion.php

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+<?php
+
+namespace Spatie\Holidays\Exceptions;
+
+use RuntimeException;
+
+class InvalidRegion extends RuntimeException
+{
+    public static function unsupportedRegion(string $region): self
+    {
+        return new self("Region '$region' is not supported.");
+    }
+
+    public static function unsupportedLocale(string $locale): self
+    {
+        return new self("Locale '$locale' is not supported.");
+    }
+}