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#!/usr/bin/env python2
#
# Generate equivalent year table needed by duk_bi_date.c. Based on:
#
# http://code.google.com/p/v8/source/browse/trunk/src/date.h#146
#
import datetime
import pytz
def isleapyear(year):
if (year % 4) != 0:
return False
if (year % 100) != 0:
return True
if (year % 400) != 0:
return False
return True
def eqyear(weekday, isleap):
# weekday: 0=Sunday, 1=Monday, ...
if isleap:
recent_year = 1956
else:
recent_year = 1967
recent_year += (weekday * 12) % 28
year = 2008 + (recent_year + 3 * 28 - 2008) % 28
# some assertions
#
# Note that Ecmascript internal weekday (0=Sunday) matches neither
# Python weekday() (0=Monday) nor isoweekday() (1=Monday, 7=Sunday).
# Python isoweekday() % 7 matches the Ecmascript weekday.
# https://docs.python.org/2/library/datetime.html#datetime.date.isoweekday
dt = datetime.datetime(year, 1, 1, 0, 0, 0, 0, pytz.UTC) # Jan 1 00:00:00.000 UTC
#print(weekday, isleap, year, dt.isoweekday(), isleapyear(year))
#print(repr(dt))
#print(dt.isoformat())
if isleap != isleapyear(year):
raise Exception('internal error: equivalent year does not have same leap-year-ness')
pass
if weekday != dt.isoweekday() % 7:
raise Exception('internal error: equivalent year does not begin with the same weekday')
pass
return year
def main():
for i in xrange(14):
print(eqyear(i % 7, i >= 7))
if __name__ == '__main__':
main()