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#!/usr/bin/env python3
# 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 datetime import date
from pathlib import Path
"""
This file generates Gregorian dates for Mongolian lunisolar calendar based holidays.
See the Wikipedia article: https://en.wikipedia.org/wiki/Mongolian_calendar
Sources:
- https://www.math.mcgill.ca/gantumur/cal/year.html
"""
m_zero = 3
epoch = 1747
ixx = 46
betastar = 10
beta = 172
m0 = 2359237 + 2603 / 2828
m1 = 167025 / 5656
m2 = 11135 / 11312
s0 = 397 / 402
s1 = 65 / 804
s2 = 13 / 4824
a0 = 1523 / 1764
a1 = 253 / 3528
a2 = 1 / 28
def mstar(y, m):
return 12 * (y - epoch) + m - m_zero
def leap_month(y, m):
t = (24 * (y - epoch) + 2 * m - beta) % 65
return t <= 1
def leap_year(y):
t = (24 * (y - epoch) - beta) % 65
return t >= 41
def true_month(y, m, is_leap):
p = 67 * mstar(y, m) + betastar
pp, ix = divmod(p, 65)
return pp if is_leap or ix < ixx else pp + 1
def moon_tab(i):
i %= 28
s = 1
if i >= 14:
i -= 14
s = -1
if i > 7:
i = 14 - i
a = int(i)
b = a + 1
v = (0, 5, 10, 15, 19, 22, 24, 25)
return s * (v[a] if a == i else (b - i) * v[a] + (i - a) * v[b])
def sun_tab(i):
i %= 12
s = 1
if i >= 6:
i -= 6
s = -1
if i > 3:
i = 6 - i
a = int(i)
b = a + 1
v = (0, 6, 10, 11)
return s * (v[a] if a == i else (b - i) * v[a] + (i - a) * v[b])
def true_date(d, n):
mean_date = n * m1 + d * m2 + m0
mean_sun = n * s1 + d * s2 + s0
anomaly_moon = n * a1 + d * a2 + a0
moon_equ = moon_tab(28 * anomaly_moon)
anomaly_sun = mean_sun - 0.25
sun_equ = sun_tab(12 * anomaly_sun)
return mean_date + moon_equ / 60 - sun_equ / 60
def julian_day(y, m, is_leap, d):
n = true_month(y, m, is_leap)
t = true_date(d, n)
return int(t)
def gregorian_date(jdn):
f = jdn + 1401 + (4 * jdn + 274277) // 146097 * 3 // 4 - 38
e = 4 * f + 3
h = e % 1461 // 4
h = 5 * h + 2
d = (h % 153) // 5 + 1
m = (h // 153 + 2) % 12 + 1
y = e // 1461 - 4716 + (14 - m) // 12
return date(y, m, d)
def mongolian_to_gregorian(m_year, m_month, is_leap, m_day):
return gregorian_date(julian_day(m_year, m_month, is_leap, m_day))
def get_tsagaan_sar(y):
return gregorian_date(julian_day(y - 1, 12, False, 30) + 1)
def find_festival_date(y, m_month, m_day):
return gregorian_date(julian_day(y, m_month, False, m_day))
CLASS_NAME = "_{cal_name}Lunisolar"
OUT_FILE_NAME = "{cal_name}_dates.py"
CLASS_TEMPLATE = """class {class_name}:
{holiday_data}"""
HOLIDAY_ARRAY_TEMPLATE = """ {hol_name}_DATES = {{
{year_dates}
}}
"""
YEAR_TEMPLATE = " {year}: ({date}),"
CALENDARS = {
"MONGOLIAN": "Mongolian",
}
MONGOLIAN_HOLIDAYS = (
("BUDDHA_DAY", lambda y: find_festival_date(y, 4, 15)),
("GENGHIS_KHAN_DAY", lambda y: find_festival_date(y, 10, 1)),
("TSAGAAN_SAR", get_tsagaan_sar),
)
def generate_data():
g_year_min, g_year_max = 2004, 2100
holiday_data = []
for hol_name, hol_func in MONGOLIAN_HOLIDAYS:
year_dates = []
for year in range(g_year_min, g_year_max + 1):
dt = hol_func(year)
date_str = f"{dt.strftime('%b').upper()}, {dt.day}"
year_dates.append(YEAR_TEMPLATE.format(year=year, date=date_str))
year_dates_str = "\n".join(year_dates)
holiday_data.append(
HOLIDAY_ARRAY_TEMPLATE.format(hol_name=hol_name, year_dates=year_dates_str)
)
holiday_data_str = "\n".join(holiday_data)
class_str = CLASS_TEMPLATE.format(
class_name=CLASS_NAME.format(cal_name="Mongolian"),
holiday_data=holiday_data_str,
)
path = Path("holidays/calendars") / OUT_FILE_NAME.format(cal_name="mongolian")
path.parent.mkdir(parents=True, exist_ok=True)
path.write_text(class_str, encoding="UTF-8")
if __name__ == "__main__":
generate_data()
|
