mirror of https://github.com/svaarala/duktape.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
58 lines
1.5 KiB
58 lines
1.5 KiB
8 years ago
|
#!/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()
|