some new features

.venv/lib/python3.12/site-packages/holidays/countries/niue.py

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+#  holidays
+#  --------
+#  A fast, efficient Python library for generating country, province and state
+#  specific sets of holidays on the fly. It aims to make determining whether a
+#  specific date is a holiday as fast and flexible as possible.
+#
+#  Authors: Vacanza Team and individual contributors (see CONTRIBUTORS file)
+#           dr-prodigy <dr.prodigy.github@gmail.com> (c) 2017-2023
+#           ryanss <ryanssdev@icloud.com> (c) 2014-2017
+#  Website: https://github.com/vacanza/holidays
+#  License: MIT (see LICENSE file)
+
+from gettext import gettext as tr
+
+from holidays.calendars.gregorian import SEP
+from holidays.groups import ChristianHolidays, InternationalHolidays, StaticHolidays
+from holidays.observed_holiday_base import (
+    ObservedHolidayBase,
+    SAT_SUN_TO_NEXT_MON,
+    SAT_SUN_TO_NEXT_MON_TUE,
+)
+
+
+class Niue(ObservedHolidayBase, ChristianHolidays, InternationalHolidays, StaticHolidays):
+    """Niue holidays.
+
+    References:
+        * <https://en.wikipedia.org/wiki/Public_holidays_in_Niue>
+        * <https://en.wikipedia.org/wiki/Niue_Constitution_Act>
+        * [Public Holidays Ordinance 1961](https://web.archive.org/web/20250102100637/http://www.paclii.org/nu/legis/num_act/nipho1961314.pdf)
+        * <https://web.archive.org/web/20250223114854/https://niuepocketguide.com/public-holidays-in-niue-other-important-dates/>
+        * [2021/2022 Public Holidays](https://web.archive.org/web/20250509105501/https://www.gov.nu/media/pages/information/1018c58017-1725838374/4nov2021-circular.pdf)
+        * [2025 Good Friday & Easter Monday and Anzac Day](https://web.archive.org/web/20250719195126/https://www.gov.nu/media/pages/gazette/3e02b3aa84-1746400484/official-psc-circular-easter-anzac-holiday.pdf)
+        * [2025 King's Birthday](https://web.archive.org/web/20250719195301/https://www.gov.nu/media/pages/public-service-circulars/3b9f44b6a0-1748573974/king-s-birthday-public-holiday-2025-circular.pdf)
+        * <http://archive.today/2025.07.14-145535/https://www.wipo.int/wipolex/en/text/427817>
+    """
+
+    country = "NU"
+    default_language = "en_NU"
+    # %s observed.
+    observed_label = tr("%s (observed)")
+    # Public Holidays Ordinance 1961.
+    start_year = 1962
+    supported_languages = ("en_NU", "en_US")
+
+    def __init__(self, *args, **kwargs):
+        ChristianHolidays.__init__(self)
+        InternationalHolidays.__init__(self)
+        StaticHolidays.__init__(self, cls=NiueStaticHolidays)
+        kwargs.setdefault("observed_rule", SAT_SUN_TO_NEXT_MON_TUE)
+        super().__init__(*args, **kwargs)
+
+    def _populate_public_holidays(self):
+        # New Year's Day.
+        self._add_observed(self._add_new_years_day(tr("New Year's Day")))
+
+        # Takai Commission Holiday.
+        self._add_observed(self._add_new_years_day_two(tr("Takai Commission Holiday")))
+
+        # Good Friday.
+        self._add_good_friday(tr("Good Friday"))
+
+        # Easter Monday.
+        self._add_easter_monday(tr("Easter Monday"))
+
+        # ANZAC Day.
+        self._add_observed(self._add_anzac_day(tr("ANZAC Day")), rule=SAT_SUN_TO_NEXT_MON)
+
+        self._add_holiday_1st_mon_of_jun(
+            # King's Birthday.
+            tr("King's Birthday")
+            if self._year >= 2023
+            # Queen's Birthday.
+            else tr("Queen's Birthday")
+        )
+
+        if self._year >= 1974:
+            # Constitution Day.
+            self._add_observed(self._add_holiday_oct_19(tr("Constitution Day")))
+
+            # Constitution Day Holiday.
+            self._add_observed(self._add_holiday_oct_20(tr("Constitution Day Holiday")))
+        else:
+            # Annexation Day.
+            self._add_holiday_3rd_mon_of_oct(tr("Annexation Day"))
+
+        # Peniamina Gospel Day.
+        self._add_holiday_4th_mon_of_oct(tr("Peniamina Gospel Day"))
+
+        # Christmas Day.
+        self._add_observed(self._add_christmas_day(tr("Christmas Day")))
+
+        # Boxing Day.
+        self._add_observed(self._add_christmas_day_two(tr("Boxing Day")))
+
+
+class NU(Niue):
+    pass
+
+
+class NIU(Niue):
+    pass
+
+
+class NiueStaticHolidays:
+    """Niue special holidays.
+
+    References:
+        * [Queen Elizabeth II's Funeral](https://web.archive.org/web/20250617174022/https://tvniue.com/2022/09/premier-will-attend-hm-the-queens-funeral-while-monday-19th-is-declared-one-off-public-holiday/)
+    """
+
+    special_public_holidays = {
+        # Queen Elizabeth II's Funeral.
+        2022: (SEP, 19, tr("Queen Elizabeth II's Funeral")),
+    }