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