Public holidays

use holidays.qweruse holidays_list, holidays_on from holidays      // Quillo 0.6: only these

chrono = { version = "0.4", default-features = false, features = ["std", "clock"] }serde_json = { version = "1", features = ["preserve_order"] }

// A delivery company's site: "closed today" banners, the next days off in each country it ships to, and Easter for the spring sale.////   quillo run holidays.qwe      then open http://localhost:8080/holidays/US/2026use "holidays.qwer"route GET /holidays/:country/:year(int) = holidays_list(country, year)?route GET /check {    {        us_july_4_2026: holidays_list("US", 2026)? | find((h) => h.name == "Independence Day"),        uk_christmas_2027: holidays_list("GB", 2027)? | filter((h) => h.date >= "2027-12-25") | map((h) => `${h.name} ${h.date} off ${h.observed}`),        closed_de: holidays_on("DE", "2026-10-03")?,        closed_us: holidays_on("US", "2026-07-03")?,        open: holidays_on("FR", "2026-10-29")?,        next_ph: holidays_next("PH", "2026-10-29", 3)? | map((h) => h.name),        japan_2026_september: holidays_list("JP", 2026)? | filter((h) => slice(h.date, 5, 7) == "09") | map((h) => `${h.date} ${h.name}`),        easter: [holidays_easter(2026, false)?, holidays_easter(2026, true)?],        countries: len(holidays_countries()),        unknown: holidays_list("XX", 2026).error,    }}

//! Public holidays of 27 countries for any year from 1970 to 2099, computed (Easter and its feasts, "the last Monday of May", Japan's equinoxes): their dates, the weekday they are taken when they fall on a weekend, whether a date is one, and the next ones.//! version: 1.0.0//!//! [dependencies]//! chrono = { version = "0.4", default-features = false, features = ["std", "clock"] }//! serde_json = { version = "1", features = ["preserve_order"] }use chrono::{Datelike, Duration, NaiveDate, Weekday};use serde_json::{json, Value};type D = NaiveDate;fn ymd(y: i32, m: u32, d: u32) -> D { NaiveDate::from_ymd_opt(y, m, d).unwrap() }/// Western Easter Sunday (the Gregorian computus).fn easter(y: i32) -> D {    let a = y % 19;    let b = y / 100;    let c = y % 100;    let d = b / 4;    let e = b % 4;    let f = (b + 8) / 25;    let g = (b - f + 1) / 3;    let h = (19 * a + b - d - g + 15) % 30;    let i = c / 4;    let k = c % 4;    let l = (32 + 2 * e + 2 * i - h - k) % 7;    let m = (a + 11 * h + 22 * l) / 451;    let month = (h + l - 7 * m + 114) / 31;    let day = (h + l - 7 * m + 114) % 31 + 1;    ymd(y, month as u32, day as u32)}/// Orthodox Easter Sunday (the Julian computus, as a Gregorian date).fn orthodox_easter(y: i32) -> D {    let a = y % 4;    let b = y % 7;    let c = y % 19;    let d = (19 * c + 15) % 30;    let e = (2 * a + 4 * b - d + 34) % 7;    let month = (d + e + 114) / 31;    let day = (d + e + 114) % 31 + 1;    ymd(y, month as u32, day as u32) + Duration::days(13)}/// The `n`th `wd` of a month (n = -1 for the last).fn nth(y: i32, m: u32, wd: Weekday, n: i32) -> D {    if n > 0 {        let first = ymd(y, m, 1);        let shift = (wd.num_days_from_monday() as i64 - first.weekday().num_days_from_monday() as i64).rem_euclid(7);        first + Duration::days(shift + 7 * (n as i64 - 1))    } else {        let last = if m == 12 { ymd(y + 1, 1, 1) } else { ymd(y, m + 1, 1) } - Duration::days(1);        let shift = (last.weekday().num_days_from_monday() as i64 - wd.num_days_from_monday() as i64).rem_euclid(7);        last - Duration::days(shift)    }}/// The first `wd` on or after a date.fn on_or_after(d: D, wd: Weekday) -> D {    d + Duration::days((wd.num_days_from_monday() as i64 - d.weekday().num_days_from_monday() as i64).rem_euclid(7))}#[derive(Clone, Copy, PartialEq)]enum Shift { None, UsStyle, NextWeekday, SundayToMonday, Japan }struct Country { code: &'static str, name: &'static str, shift: Shift }const COUNTRIES: [Country; 27] = [    Country { code: "AT", name: "Austria", shift: Shift::None },    Country { code: "AU", name: "Australia", shift: Shift::NextWeekday },    Country { code: "BE", name: "Belgium", shift: Shift::None },    Country { code: "BR", name: "Brazil", shift: Shift::None },    Country { code: "CA", name: "Canada", shift: Shift::NextWeekday },    Country { code: "CH", name: "Switzerland", shift: Shift::None },    Country { code: "CZ", name: "Czechia", shift: Shift::None },    Country { code: "DE", name: "Germany", shift: Shift::None },    Country { code: "DK", name: "Denmark", shift: Shift::None },    Country { code: "ES", name: "Spain", shift: Shift::None },    Country { code: "FI", name: "Finland", shift: Shift::None },    Country { code: "FR", name: "France", shift: Shift::None },    Country { code: "GB", name: "United Kingdom (England and Wales)", shift: Shift::NextWeekday },    Country { code: "GR", name: "Greece", shift: Shift::None },    Country { code: "IE", name: "Ireland", shift: Shift::None },    Country { code: "IT", name: "Italy", shift: Shift::None },    Country { code: "JP", name: "Japan", shift: Shift::Japan },    Country { code: "MX", name: "Mexico", shift: Shift::None },    Country { code: "NL", name: "Netherlands", shift: Shift::None },    Country { code: "NO", name: "Norway", shift: Shift::None },    Country { code: "NZ", name: "New Zealand", shift: Shift::NextWeekday },    Country { code: "PH", name: "Philippines", shift: Shift::None },    Country { code: "PL", name: "Poland", shift: Shift::None },    Country { code: "PT", name: "Portugal", shift: Shift::None },    Country { code: "SE", name: "Sweden", shift: Shift::None },    Country { code: "US", name: "United States (federal)", shift: Shift::UsStyle },    Country { code: "ZA", name: "South Africa", shift: Shift::SundayToMonday },];use Weekday::*;// (date, name, moved when it falls on a weekend)fn rules(code: &str, y: i32) -> Vec<(D, &'static str, bool)> {    let e = easter(y);    let ed = |n: i64| e + Duration::days(n);    let mut v: Vec<(D, &'static str, bool)> = Vec::new();    let mut add = |d: D, n: &'static str, moved: bool| v.push((d, n, moved));    match code {        "US" => {            add(ymd(y, 1, 1), "New Year's Day", true);            add(nth(y, 1, Mon, 3), "Martin Luther King Jr. Day", false);            add(nth(y, 2, Mon, 3), "Washington's Birthday", false);            add(nth(y, 5, Mon, -1), "Memorial Day", false);            if y >= 2021 { add(ymd(y, 6, 19), "Juneteenth", true) }            add(ymd(y, 7, 4), "Independence Day", true);            add(nth(y, 9, Mon, 1), "Labor Day", false);            add(nth(y, 10, Mon, 2), "Columbus Day", false);            add(ymd(y, 11, 11), "Veterans Day", true);            add(nth(y, 11, Thu, 4), "Thanksgiving Day", false);            add(ymd(y, 12, 25), "Christmas Day", true);        }        "CA" => {            add(ymd(y, 1, 1), "New Year's Day", true);            add(ed(-2), "Good Friday", false);            add(on_or_after(ymd(y, 5, 18), Mon), "Victoria Day", false);            add(ymd(y, 7, 1), "Canada Day", true);            add(nth(y, 9, Mon, 1), "Labour Day", false);            if y >= 2021 { add(ymd(y, 9, 30), "National Day for Truth and Reconciliation", true) }            add(nth(y, 10, Mon, 2), "Thanksgiving", false);            add(ymd(y, 11, 11), "Remembrance Day", true);            add(ymd(y, 12, 25), "Christmas Day", true);            add(ymd(y, 12, 26), "Boxing Day", true);        }        "GB" => {            add(ymd(y, 1, 1), "New Year's Day", true);            add(ed(-2), "Good Friday", false);            add(ed(1), "Easter Monday", false);            add(nth(y, 5, Mon, 1), "Early May bank holiday", false);            add(nth(y, 5, Mon, -1), "Spring bank holiday", false);            add(nth(y, 8, Mon, -1), "Summer bank holiday", false);            add(ymd(y, 12, 25), "Christmas Day", true);            add(ymd(y, 12, 26), "Boxing Day", true);        }        "IE" => {            add(ymd(y, 1, 1), "New Year's Day", false);            if y >= 2023 { let f1 = ymd(y, 2, 1); add(if f1.weekday() == Fri { f1 } else { nth(y, 2, Mon, 1) }, "Saint Brigid's Day", false) }            add(ymd(y, 3, 17), "Saint Patrick's Day", false);            add(ed(1), "Easter Monday", false);            add(nth(y, 5, Mon, 1), "May Day", false);            add(nth(y, 6, Mon, 1), "June bank holiday", false);            add(nth(y, 8, Mon, 1), "August bank holiday", false);            add(nth(y, 10, Mon, -1), "October bank holiday", false);            add(ymd(y, 12, 25), "Christmas Day", false);            add(ymd(y, 12, 26), "Saint Stephen's Day", false);        }        "FR" => {            add(ymd(y, 1, 1), "New Year's Day", false);            add(ed(1), "Easter Monday", false);            add(ymd(y, 5, 1), "Labour Day", false);            add(ymd(y, 5, 8), "Victory in Europe Day", false);            add(ed(39), "Ascension Day", false);            add(ed(50), "Whit Monday", false);            add(ymd(y, 7, 14), "Bastille Day", false);            add(ymd(y, 8, 15), "Assumption", false);            add(ymd(y, 11, 1), "All Saints' Day", false);            add(ymd(y, 11, 11), "Armistice Day", false);            add(ymd(y, 12, 25), "Christmas Day", false);        }        "DE" => {            add(ymd(y, 1, 1), "New Year's Day", false);            add(ed(-2), "Good Friday", false);            add(ed(1), "Easter Monday", false);            add(ymd(y, 5, 1), "Labour Day", false);            add(ed(39), "Ascension Day", false);            add(ed(50), "Whit Monday", false);            add(ymd(y, 10, 3), "German Unity Day", false);            add(ymd(y, 12, 25), "Christmas Day", false);            add(ymd(y, 12, 26), "Second Day of Christmas", false);        }        "NL" => {            add(ymd(y, 1, 1), "New Year's Day", false);            add(e, "Easter Sunday", false);            add(ed(1), "Easter Monday", false);            let kd = ymd(y, 4, 27);            add(if kd.weekday() == Sun { ymd(y, 4, 26) } else { kd }, "King's Day", false);            add(ymd(y, 5, 5), "Liberation Day", false);            add(ed(39), "Ascension Day", false);            add(ed(49), "Whit Sunday", false);            add(ed(50), "Whit Monday", false);            add(ymd(y, 12, 25), "Christmas Day", false);            add(ymd(y, 12, 26), "Second Day of Christmas", false);        }        "BE" => {            add(ymd(y, 1, 1), "New Year's Day", false);            add(ed(1), "Easter Monday", false);            add(ymd(y, 5, 1), "Labour Day", false);            add(ed(39), "Ascension Day", false);            add(ed(50), "Whit Monday", false);            add(ymd(y, 7, 21), "National Day", false);            add(ymd(y, 8, 15), "Assumption", false);            add(ymd(y, 11, 1), "All Saints' Day", false);            add(ymd(y, 11, 11), "Armistice Day", false);            add(ymd(y, 12, 25), "Christmas Day", false);        }        "ES" => {            add(ymd(y, 1, 1), "New Year's Day", false);            add(ymd(y, 1, 6), "Epiphany", false);            add(ed(-2), "Good Friday", false);            add(ymd(y, 5, 1), "Labour Day", false);            add(ymd(y, 8, 15), "Assumption", false);            add(ymd(y, 10, 12), "National Day of Spain", false);            add(ymd(y, 11, 1), "All Saints' Day", false);            add(ymd(y, 12, 6), "Constitution Day", false);            add(ymd(y, 12, 8), "Immaculate Conception", false);            add(ymd(y, 12, 25), "Christmas Day", false);        }        "IT" => {            add(ymd(y, 1, 1), "New Year's Day", false);            add(ymd(y, 1, 6), "Epiphany", false);            add(e, "Easter Sunday", false);            add(ed(1), "Easter Monday", false);            add(ymd(y, 4, 25), "Liberation Day", false);            add(ymd(y, 5, 1), "Labour Day", false);            add(ymd(y, 6, 2), "Republic Day", false);            add(ymd(y, 8, 15), "Ferragosto", false);            add(ymd(y, 11, 1), "All Saints' Day", false);            add(ymd(y, 12, 8), "Immaculate Conception", false);            add(ymd(y, 12, 25), "Christmas Day", false);            add(ymd(y, 12, 26), "Saint Stephen's Day", false);        }        "PT" => {            add(ymd(y, 1, 1), "New Year's Day", false);            add(ed(-2), "Good Friday", false);            add(e, "Easter Sunday", false);            add(ymd(y, 4, 25), "Freedom Day", false);            add(ymd(y, 5, 1), "Labour Day", false);            add(ymd(y, 6, 10), "Portugal Day", false);            add(ed(60), "Corpus Christi", false);            add(ymd(y, 8, 15), "Assumption", false);            add(ymd(y, 10, 5), "Republic Day", false);            add(ymd(y, 11, 1), "All Saints' Day", false);            add(ymd(y, 12, 1), "Restoration of Independence", false);            add(ymd(y, 12, 8), "Immaculate Conception", false);            add(ymd(y, 12, 25), "Christmas Day", false);        }        "AT" => {            add(ymd(y, 1, 1), "New Year's Day", false);            add(ymd(y, 1, 6), "Epiphany", false);            add(ed(1), "Easter Monday", false);            add(ymd(y, 5, 1), "Labour Day", false);            add(ed(39), "Ascension Day", false);            add(ed(50), "Whit Monday", false);            add(ed(60), "Corpus Christi", false);            add(ymd(y, 8, 15), "Assumption", false);            add(ymd(y, 10, 26), "National Day", false);            add(ymd(y, 11, 1), "All Saints' Day", false);            add(ymd(y, 12, 8), "Immaculate Conception", false);            add(ymd(y, 12, 25), "Christmas Day", false);            add(ymd(y, 12, 26), "Saint Stephen's Day", false);        }        "CH" => {            add(ymd(y, 1, 1), "New Year's Day", false);            add(ed(-2), "Good Friday", false);            add(ed(1), "Easter Monday", false);            add(ed(39), "Ascension Day", false);            add(ed(50), "Whit Monday", false);            add(ymd(y, 8, 1), "Swiss National Day", false);            add(ymd(y, 12, 25), "Christmas Day", false);            add(ymd(y, 12, 26), "Saint Stephen's Day", false);        }        "SE" => {            add(ymd(y, 1, 1), "New Year's Day", false);            add(ymd(y, 1, 6), "Epiphany", false);            add(ed(-2), "Good Friday", false);            add(e, "Easter Sunday", false);            add(ed(1), "Easter Monday", false);            add(ymd(y, 5, 1), "May Day", false);            add(ed(39), "Ascension Day", false);            add(ed(49), "Whit Sunday", false);            add(ymd(y, 6, 6), "National Day", false);            add(on_or_after(ymd(y, 6, 19), Fri), "Midsummer Eve", false);            add(on_or_after(ymd(y, 6, 20), Sat), "Midsummer Day", false);            add(on_or_after(ymd(y, 10, 31), Sat), "All Saints' Day", false);            add(ymd(y, 12, 24), "Christmas Eve", false);            add(ymd(y, 12, 25), "Christmas Day", false);            add(ymd(y, 12, 26), "Second Day of Christmas", false);            add(ymd(y, 12, 31), "New Year's Eve", false);        }        "NO" => {            add(ymd(y, 1, 1), "New Year's Day", false);            add(ed(-3), "Maundy Thursday", false);            add(ed(-2), "Good Friday", false);            add(e, "Easter Sunday", false);            add(ed(1), "Easter Monday", false);            add(ymd(y, 5, 1), "Labour Day", false);            add(ymd(y, 5, 17), "Constitution Day", false);            add(ed(39), "Ascension Day", false);            add(ed(49), "Whit Sunday", false);            add(ed(50), "Whit Monday", false);            add(ymd(y, 12, 25), "Christmas Day", false);            add(ymd(y, 12, 26), "Saint Stephen's Day", false);        }        "DK" => {            add(ymd(y, 1, 1), "New Year's Day", false);            add(ed(-3), "Maundy Thursday", false);            add(ed(-2), "Good Friday", false);            add(e, "Easter Sunday", false);            add(ed(1), "Easter Monday", false);            if y < 2024 { add(ed(26), "Great Prayer Day", false) }            add(ed(39), "Ascension Day", false);            add(ed(49), "Whit Sunday", false);            add(ed(50), "Whit Monday", false);            add(ymd(y, 12, 25), "Christmas Day", false);            add(ymd(y, 12, 26), "Second Day of Christmas", false);        }        "FI" => {            add(ymd(y, 1, 1), "New Year's Day", false);            add(ymd(y, 1, 6), "Epiphany", false);            add(ed(-2), "Good Friday", false);            add(e, "Easter Sunday", false);            add(ed(1), "Easter Monday", false);            add(ymd(y, 5, 1), "May Day", false);            add(ed(39), "Ascension Day", false);            add(ed(49), "Whit Sunday", false);            add(on_or_after(ymd(y, 6, 19), Fri), "Midsummer Eve", false);            add(on_or_after(ymd(y, 6, 20), Sat), "Midsummer Day", false);            add(on_or_after(ymd(y, 10, 31), Sat), "All Saints' Day", false);            add(ymd(y, 12, 6), "Independence Day", false);            add(ymd(y, 12, 24), "Christmas Eve", false);            add(ymd(y, 12, 25), "Christmas Day", false);            add(ymd(y, 12, 26), "Saint Stephen's Day", false);        }        "PL" => {            add(ymd(y, 1, 1), "New Year's Day", false);            if y >= 2011 { add(ymd(y, 1, 6), "Epiphany", false) }            add(e, "Easter Sunday", false);            add(ed(1), "Easter Monday", false);            add(ymd(y, 5, 1), "Labour Day", false);            add(ymd(y, 5, 3), "Constitution Day", false);            add(ed(49), "Whit Sunday", false);            add(ed(60), "Corpus Christi", false);            add(ymd(y, 8, 15), "Assumption", false);            add(ymd(y, 11, 1), "All Saints' Day", false);            add(ymd(y, 11, 11), "Independence Day", false);            if y >= 2025 { add(ymd(y, 12, 24), "Christmas Eve", false) }            add(ymd(y, 12, 25), "Christmas Day", false);            add(ymd(y, 12, 26), "Second Day of Christmas", false);        }        "CZ" => {            add(ymd(y, 1, 1), "Restoration Day of the Independent Czech State", false);            add(ed(-2), "Good Friday", false);            add(ed(1), "Easter Monday", false);            add(ymd(y, 5, 1), "Labour Day", false);            add(ymd(y, 5, 8), "Liberation Day", false);            add(ymd(y, 7, 5), "Saints Cyril and Methodius Day", false);            add(ymd(y, 7, 6), "Jan Hus Day", false);            add(ymd(y, 9, 28), "Statehood Day", false);            add(ymd(y, 10, 28), "Independent Czechoslovak State Day", false);            add(ymd(y, 11, 17), "Struggle for Freedom and Democracy Day", false);            add(ymd(y, 12, 24), "Christmas Eve", false);            add(ymd(y, 12, 25), "Christmas Day", false);            add(ymd(y, 12, 26), "Saint Stephen's Day", false);        }        "GR" => {            let o = orthodox_easter(y);            add(ymd(y, 1, 1), "New Year's Day", false);            add(ymd(y, 1, 6), "Epiphany", false);            add(o - Duration::days(48), "Clean Monday", false);            add(ymd(y, 3, 25), "Independence Day", false);            add(o - Duration::days(2), "Orthodox Good Friday", false);            add(o, "Orthodox Easter Sunday", false);            add(o + Duration::days(1), "Orthodox Easter Monday", false);            add(ymd(y, 5, 1), "Labour Day", false);            add(o + Duration::days(50), "Orthodox Whit Monday", false);            add(ymd(y, 8, 15), "Assumption", false);            add(ymd(y, 10, 28), "Ohi Day", false);            add(ymd(y, 12, 25), "Christmas Day", false);            add(ymd(y, 12, 26), "Synaxis of the Mother of God", false);        }        "BR" => {            add(ymd(y, 1, 1), "New Year's Day", false);            add(ed(-48), "Carnival Monday", false);            add(ed(-47), "Carnival Tuesday", false);            add(ed(-2), "Good Friday", false);            add(ymd(y, 4, 21), "Tiradentes", false);            add(ymd(y, 5, 1), "Labour Day", false);            add(ed(60), "Corpus Christi", false);            add(ymd(y, 9, 7), "Independence Day", false);            add(ymd(y, 10, 12), "Our Lady of Aparecida", false);            add(ymd(y, 11, 2), "All Souls' Day", false);            add(ymd(y, 11, 15), "Republic Proclamation Day", false);            if y >= 2024 { add(ymd(y, 11, 20), "Black Consciousness Day", false) }            add(ymd(y, 12, 25), "Christmas Day", false);        }        "MX" => {            add(ymd(y, 1, 1), "New Year's Day", false);            add(nth(y, 2, Mon, 1), "Constitution Day", false);            add(nth(y, 3, Mon, 3), "Benito Juárez's Birthday", false);            add(ymd(y, 5, 1), "Labour Day", false);            add(ymd(y, 9, 16), "Independence Day", false);            if y >= 2024 && (y - 2024) % 6 == 0 { add(ymd(y, 10, 1), "Inauguration Day", false) }            add(nth(y, 11, Mon, 3), "Revolution Day", false);            add(ymd(y, 12, 25), "Christmas Day", false);        }        "AU" => {            add(ymd(y, 1, 1), "New Year's Day", true);            add(ymd(y, 1, 26), "Australia Day", true);            add(ed(-2), "Good Friday", false);            add(ed(-1), "Easter Saturday", false);            add(ed(1), "Easter Monday", false);            add(ymd(y, 4, 25), "Anzac Day", false);            add(nth(y, 6, Mon, 2), "King's Birthday", false);            add(ymd(y, 12, 25), "Christmas Day", true);            add(ymd(y, 12, 26), "Boxing Day", true);        }        "NZ" => {            add(ymd(y, 1, 1), "New Year's Day", true);            add(ymd(y, 1, 2), "Day after New Year's Day", true);            add(ymd(y, 2, 6), "Waitangi Day", y >= 2014);            add(ed(-2), "Good Friday", false);            add(ed(1), "Easter Monday", false);            add(ymd(y, 4, 25), "Anzac Day", y >= 2015);            add(nth(y, 6, Mon, 1), "King's Birthday", false);            let matariki = [(2022, 6, 24), (2023, 7, 14), (2024, 6, 28), (2025, 6, 20), (2026, 7, 10), (2027, 6, 25), (2028, 7, 14), (2029, 7, 6), (2030, 6, 21)];            if let Some((_, m, d)) = matariki.iter().find(|(yy, _, _)| *yy == y) { add(ymd(y, *m, *d), "Matariki", false) }            add(nth(y, 10, Mon, 4), "Labour Day", false);            add(ymd(y, 12, 25), "Christmas Day", true);            add(ymd(y, 12, 26), "Boxing Day", true);        }        "PH" => {            add(ymd(y, 1, 1), "New Year's Day", false);            add(ed(-3), "Maundy Thursday", false);            add(ed(-2), "Good Friday", false);            add(ed(-1), "Black Saturday", false);            add(ymd(y, 4, 9), "Araw ng Kagitingan", false);            add(ymd(y, 5, 1), "Labor Day", false);            add(ymd(y, 6, 12), "Independence Day", false);            add(ymd(y, 8, 21), "Ninoy Aquino Day", false);            add(nth(y, 8, Mon, -1), "National Heroes Day", false);            add(ymd(y, 11, 1), "All Saints' Day", false);            add(ymd(y, 11, 30), "Bonifacio Day", false);            add(ymd(y, 12, 8), "Feast of the Immaculate Conception", false);            add(ymd(y, 12, 24), "Christmas Eve", false);            add(ymd(y, 12, 25), "Christmas Day", false);            add(ymd(y, 12, 30), "Rizal Day", false);            add(ymd(y, 12, 31), "Last Day of the Year", false);        }        "JP" => {            let since = (y - 1980) as f64;            let leap = ((y - 1980) / 4) as f64;            add(ymd(y, 1, 1), "New Year's Day", true);            add(nth(y, 1, Mon, 2), "Coming of Age Day", false);            add(ymd(y, 2, 11), "National Foundation Day", true);            if y >= 2020 { add(ymd(y, 2, 23), "Emperor's Birthday", true) }            add(ymd(y, 3, (20.8431 + 0.242194 * since - leap).floor() as u32), "Vernal Equinox Day", true);            add(ymd(y, 4, 29), "Showa Day", true);            add(ymd(y, 5, 3), "Constitution Memorial Day", true);            add(ymd(y, 5, 4), "Greenery Day", true);            add(ymd(y, 5, 5), "Children's Day", true);            add(nth(y, 7, Mon, 3), "Marine Day", false);            if y >= 2016 { add(ymd(y, 8, 11), "Mountain Day", true) }            add(nth(y, 9, Mon, 3), "Respect for the Aged Day", false);            add(ymd(y, 9, (23.2488 + 0.242194 * since - leap).floor() as u32), "Autumnal Equinox Day", true);            add(nth(y, 10, Mon, 2), "Sports Day", false);            add(ymd(y, 11, 3), "Culture Day", true);            add(ymd(y, 11, 23), "Labour Thanksgiving Day", true);        }        "ZA" => {            add(ymd(y, 1, 1), "New Year's Day", true);            add(ymd(y, 3, 21), "Human Rights Day", true);            add(ed(-2), "Good Friday", false);            add(ed(1), "Family Day", false);            add(ymd(y, 4, 27), "Freedom Day", true);            add(ymd(y, 5, 1), "Workers' Day", true);            add(ymd(y, 6, 16), "Youth Day", true);            add(ymd(y, 8, 9), "National Women's Day", true);            add(ymd(y, 9, 24), "Heritage Day", true);            add(ymd(y, 12, 16), "Day of Reconciliation", true);            add(ymd(y, 12, 25), "Christmas Day", true);            add(ymd(y, 12, 26), "Day of Goodwill", true);        }        _ => {}    }    v.sort_by_key(|x| x.0);    v}fn country(code: &str) -> Result<&'static Country, String> {    let c = code.trim().to_uppercase();    let c = if c == "UK" { "GB".to_string() } else { c };    COUNTRIES.iter().find(|x| x.code == c).ok_or_else(|| format!("`{}` is not a country this knows: {}", code, COUNTRIES.iter().map(|c| c.code).collect::<Vec<_>>().join(", ")))}struct Holiday { date: D, name: &'static str, observed: D }fn year_list(c: &Country, y: i32) -> Vec<Holiday> {    let raw = rules(c.code, y);    let weekend = |d: D| matches!(d.weekday(), Sat | Sun);    let mut taken: Vec<D> = raw.iter().map(|h| h.0).filter(|d| !weekend(*d)).collect();    let mut out = Vec::new();    for (d, name, moved) in &raw {        let mut obs = *d;        if *moved {            match c.shift {                Shift::UsStyle => { if d.weekday() == Sat { obs = *d - Duration::days(1) } else if d.weekday() == Sun { obs = *d + Duration::days(1) } }                Shift::NextWeekday => {                    if weekend(*d) {                        let mut n = *d + Duration::days(1);                        while weekend(n) || taken.contains(&n) { n += Duration::days(1) }                        obs = n;                        taken.push(n);                    }                }                Shift::SundayToMonday => { if d.weekday() == Sun { obs = *d + Duration::days(1) } }                Shift::Japan => {                    if d.weekday() == Sun {                        let all: Vec<D> = raw.iter().map(|h| h.0).collect();                        let mut n = *d + Duration::days(1);                        while all.contains(&n) || taken.contains(&n) { n += Duration::days(1) }                        obs = n;                        taken.push(n);                    }                }                Shift::None => {}            }        }        out.push(Holiday { date: *d, name, observed: obs });    }    if c.shift == Shift::Japan {        // A day between two holidays is a holiday too (kokumin no kyūjitsu).        let dates: Vec<D> = out.iter().map(|h| h.date).collect();        for &d in &dates {            let gap = d + Duration::days(1);            if dates.contains(&(d + Duration::days(2))) && !dates.contains(&gap) && gap.weekday() != Sun {                out.push(Holiday { date: gap, name: "Citizens' Holiday", observed: gap });            }        }        out.sort_by_key(|h| h.date);    }    out}fn to_json(h: &Holiday) -> Value {    json!({        "date": h.date.to_string(),        "name": h.name,        "weekday": h.date.format("%A").to_string(),        "observed": h.observed.to_string(),    })}fn year_ok(y: i64) -> Result<i32, String> {    if !(1970..=2099).contains(&y) { return Err(format!("years 1970 to 2099, not {}", y)) }    Ok(y as i32)}fn parse(d: &str) -> Result<D, String> {    NaiveDate::parse_from_str(d.trim().get(..10).unwrap_or(d), "%Y-%m-%d").map_err(|_| format!("`{}` is not a date (2026-12-25)", d))}/// The public holidays of `country` (`"US"`, `"GB"`, `"DE"`, `"JP"`, `"PH"`...) in `year`: a list of `{ date, name, weekday, observed }`, in date order./// `observed` is the day off when the holiday is moved for falling on a weekend (US Saturday holidays on the Friday, UK and Australian ones on the next Monday...), else `date`. National holidays only: not regional ones, nor ones fixed each year by decree.pub fn holidays_list(country: &str, year: i64) -> Result<Vec<Value>, String> {    let c = self::country(country)?;    Ok(year_list(c, year_ok(year)?).iter().map(to_json).collect())}/// The holiday on `date` in `country`, as its name, counting the day it is observed on; null when it is a working day. For "closed today" banners and delivery dates.pub fn holidays_on(country: &str, date: &str) -> Result<Option<String>, String> {    let c = self::country(country)?;    let d = parse(date)?;    let y = year_ok(d.year() as i64)?;    let hit = year_list(c, y).into_iter().chain(if y < 2099 { year_list(c, y + 1) } else { vec![] }).find(|h| h.date == d || h.observed == d);    Ok(hit.map(|h| if h.date == d { h.name.to_string() } else { format!("{} (observed)", h.name) }))}/// The next `count` holidays in `country` from `date` on (that day included).pub fn holidays_next(country: &str, date: &str, count: i64) -> Result<Vec<Value>, String> {    let c = self::country(country)?;    let d = parse(date)?;    let mut out = Vec::new();    let mut y = year_ok(d.year() as i64)?;    while (out.len() as i64) < count.min(200) && y <= 2099 {        for h in year_list(c, y) {            if h.date >= d && (out.len() as i64) < count { out.push(to_json(&h)) }        }        y += 1;    }    Ok(out)}/// The countries this knows: a list of `{ code, name }`.pub fn holidays_countries() -> Vec<Value> {    COUNTRIES.iter().map(|c| json!({ "code": c.code, "name": c.name })).collect()}/// Easter Sunday of `year`, Western, or Orthodox when `orthodox` (as a Gregorian date).pub fn holidays_easter(year: i64, orthodox: bool) -> Result<String, String> {    if !(1583..=4099).contains(&year) { return Err("years 1583 to 4099".into()) }    Ok(if orthodox { orthodox_easter(year as i32) } else { easter(year as i32) }.to_string())}