391 lines
14 KiB
Python
391 lines
14 KiB
Python
#
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# Gramps - a GTK+/GNOME based genealogy program
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#
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# Copyright (C) 2001 Donald N. Allingham
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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Gregorian calendar module for GRAMPS.
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The original algorithms for this module came from Scott E. Lee's
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C implementation. The original C source can be found at Scott's
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web site at http://www.scottlee.com
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"""
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__author__ = "Donald N. Allingham"
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__version__ = "$Revision$"
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#-------------------------------------------------------------------------
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#
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# Gramps Modules
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#
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#-------------------------------------------------------------------------
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import Calendar
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from gettext import gettext as _
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#-------------------------------------------------------------------------
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#
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# Hebrew calendar
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#
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#-------------------------------------------------------------------------
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class Hebrew(Calendar.Calendar):
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"""Jewish Calendar"""
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HALAKIM_PER_HOUR = 1080
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HALAKIM_PER_DAY = 25920
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HALAKIM_PER_LUNAR_CYCLE = ((29 * HALAKIM_PER_DAY) + 13753)
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HALAKIM_PER_METONIC_CYCLE = (HALAKIM_PER_LUNAR_CYCLE * (12 * 19 + 7))
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SDN_OFFSET = 347997
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NEW_MOON_OF_CREATION = 31524
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SUNDAY = 0
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MONDAY = 1
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TUESDAY = 2
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WEDNESDAY= 3
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FRIDAY = 5
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NOON = (18 * HALAKIM_PER_HOUR)
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AM3_11_20 = ((9 * HALAKIM_PER_HOUR) + 204)
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AM9_32_43 = ((15 * HALAKIM_PER_HOUR) + 589)
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monthsPerYear = [
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12, 12, 13, 12, 12, 13, 12, 13, 12, 12,
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13, 12, 12, 13, 12, 12, 13, 12, 13 ]
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yearOffset = [
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0, 12, 24, 37, 49, 61, 74, 86, 99, 111, 123,
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136, 148, 160, 173, 185, 197, 210, 222 ]
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MONTHS = [
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"Tishri", "Heshvan", "Kislev", "Tevet", "Shevat", "AdarI",
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"AdarII", "Nisan", "Iyyar", "Sivan", "Tammuz", "Av",
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"Elul",]
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M2NUM = {
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"tishri" : 1, "heshvan" : 2, "kislev" : 3, "tevet" : 4,
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"shevat" : 5, "adari" : 6, "adarii" : 7, "nisan" : 8,
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"iyyar" : 9, "sivan" :10, "tammuz" :11, "av" : 12,
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"elul" : 13,"tsh" : 1, "csh" : 2, "ksl" : 3,
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"tvt" : 4, "shv" : 5, "adr" : 6, "ads" : 7,
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"nsn" : 8, "iyr" : 9, "svn" :10, "tmz" : 11,
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"aav" :12, "ell" :13,
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}
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NAME = "Hebrew"
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TNAME = _("Hebrew")
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def quote_display(self,year,month,day,mode):
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return "%s (%s)" % (self.display(year,month,day,mode),Hebrew.NAME)
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def month(self,val):
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try:
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return Hebrew.MONTHS[val-1]
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except:
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return "Illegal Month"
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def set_month_string(self,text):
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try:
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return Hebrew.M2NUM[unicode(text.lower())]
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except KeyError:
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return Calendar.UNDEF
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def Tishri1(self,metonicYear, moladDay, moladHalakim):
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tishri1 = moladDay
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dow = tishri1 % 7
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leapYear = metonicYear in [ 2, 5, 7, 10, 13, 16, 18]
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lastWasLeapYear = metonicYear in [ 3, 6, 8, 11, 14, 17, 0]
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# Apply rules 2, 3 and 4.
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if ((moladHalakim >= Hebrew.NOON) or
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((not leapYear) and dow == Hebrew.TUESDAY and
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moladHalakim >= Hebrew.AM3_11_20) or
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(lastWasLeapYear and dow == Hebrew.MONDAY and moladHalakim >= Hebrew.AM9_32_43)) :
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tishri1 = tishri1 + 1
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dow = dow + 1
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if dow == 7:
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dow = 0
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# Apply rule 1 after the others because it can cause an additional
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# delay of one day
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if dow == Hebrew.WEDNESDAY or dow == Hebrew.FRIDAY or dow == Hebrew.SUNDAY:
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tishri1 = tishri1 + 1
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return tishri1
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def MoladOfMetonicCycle(self,metonicCycle):
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# Start with the time of the first molad after creation.
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r1 = Hebrew.NEW_MOON_OF_CREATION
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# Calculate metonicCycle * HALAKIM_PER_METONIC_CYCLE. The upper 32
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# bits of the result will be in r2 and the lower 16 bits will be
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# in r1.
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r1 = r1 + (metonicCycle * (Hebrew.HALAKIM_PER_METONIC_CYCLE & 0xFFFF))
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r2 = r1 >> 16
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r2 = r2 + (metonicCycle * ((Hebrew.HALAKIM_PER_METONIC_CYCLE >> 16) & 0xFFFF))
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# Calculate r2r1 / HALAKIM_PER_DAY. The remainder will be in r1, the
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# upper 16 bits of the quotient will be in d2 and the lower 16 bits
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# will be in d1.
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d2 = r2 / Hebrew.HALAKIM_PER_DAY
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r2 = r2 - (d2 * Hebrew.HALAKIM_PER_DAY)
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r1 = (r2 << 16) | (r1 & 0xFFFF)
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d1 = r1 / Hebrew.HALAKIM_PER_DAY
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r1 = r1 - ( d1 * Hebrew.HALAKIM_PER_DAY)
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MoladDay = (d2 << 16) | d1
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MoladHalakim = r1
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return (MoladDay,MoladHalakim)
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def TishriMolad(self,inputDay):
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# Estimate the metonic cycle number. Note that this may be an under
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# estimate because there are 6939.6896 days in a metonic cycle not
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# 6940, but it will never be an over estimate. The loop below will
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# correct for any error in this estimate. */
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metonicCycle = (inputDay + 310) / 6940
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# Calculate the time of the starting molad for this metonic cycle. */
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(moladDay, moladHalakim) = self.MoladOfMetonicCycle(metonicCycle)
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# If the above was an under estimate, increment the cycle number until
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# the correct one is found. For modern dates this loop is about 98.6%
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# likely to not execute, even once, because the above estimate is
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# really quite close.
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while moladDay < (inputDay - 6940 + 310):
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metonicCycle = metonicCycle + 1
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moladHalakim = moladHalakim + Hebrew.HALAKIM_PER_METONIC_CYCLE
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moladDay = moladDay + ( moladHalakim / Hebrew.HALAKIM_PER_DAY)
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moladHalakim = moladHalakim % Hebrew.HALAKIM_PER_DAY
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# Find the molad of Tishri closest to this date.
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for metonicYear in range(0,18):
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if moladDay > inputDay - 74:
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break
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moladHalakim = moladHalakim + \
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(Hebrew.HALAKIM_PER_LUNAR_CYCLE * Hebrew.monthsPerYear[metonicYear])
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moladDay = moladDay + (moladHalakim / Hebrew.HALAKIM_PER_DAY)
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moladHalakim = moladHalakim % Hebrew.HALAKIM_PER_DAY
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else:
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metonicYear = metonicYear + 1
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return (metonicCycle, metonicYear, moladDay, moladHalakim)
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def StartOfYear(self,year):
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MetonicCycle = (year - 1) / 19;
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MetonicYear = (year - 1) % 19;
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(MoladDay, MoladHalakim) = self.MoladOfMetonicCycle(MetonicCycle)
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MoladHalakim = MoladHalakim + (Hebrew.HALAKIM_PER_LUNAR_CYCLE * Hebrew.yearOffset[MetonicYear])
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MoladDay = MoladDay + (MoladHalakim / Hebrew.HALAKIM_PER_DAY)
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MoladHalakim = MoladHalakim % Hebrew.HALAKIM_PER_DAY
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pTishri1 = self.Tishri1(MetonicYear, MoladDay, MoladHalakim);
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return (MetonicCycle, MetonicYear, MoladDay, MoladHalakim, pTishri1)
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def get_ymd(self,sdn):
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"""Converts an SDN number to a Julian calendar date"""
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if sdn <= Hebrew.SDN_OFFSET :
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return (0,0,0)
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inputDay = sdn - Hebrew.SDN_OFFSET
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(metonicCycle, metonicYear, day, halakim) = self.TishriMolad(inputDay)
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tishri1 = self.Tishri1(metonicYear, day, halakim);
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if inputDay >= tishri1:
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# It found Tishri 1 at the start of the year
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Year = (metonicCycle * 19) + metonicYear + 1
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if inputDay < tishri1 + 59:
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if inputDay < tishri1 + 30:
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Month = 1
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Day = inputDay - tishri1 + 1
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else:
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Month = 2
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Day = inputDay - tishri1 - 29
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return (Year, Month, Day)
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# We need the length of the year to figure this out, so find
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# Tishri 1 of the next year. */
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halakim = halakim + (Hebrew.HALAKIM_PER_LUNAR_CYCLE * Hebrew.monthsPerYear[metonicYear])
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day = day + (halakim / Hebrew.HALAKIM_PER_DAY)
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halakim = halakim % Hebrew.HALAKIM_PER_DAY;
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tishri1After = self.Tishri1((metonicYear + 1) % 19, day, halakim);
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else:
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# It found Tishri 1 at the end of the year.
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Year = metonicCycle * 19 + metonicYear
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if inputDay >= tishri1 - 177:
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# It is one of the last 6 months of the year.
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if inputDay > tishri1 - 30:
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Month = 13
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Day = inputDay - tishri1 + 30
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elif inputDay > tishri1 - 60:
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Month = 12
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Day = inputDay - tishri1 + 60
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elif inputDay > tishri1 - 89:
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Month = 11
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Day = inputDay - tishri1 + 89
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elif inputDay > tishri1 - 119:
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Month = 10
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Day = inputDay - tishri1 + 119
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elif inputDay > tishri1 - 148:
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Month = 9
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Day = inputDay - tishri1 + 148
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else:
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Month = 8
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Day = inputDay - tishri1 + 178
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return (Year,Month,Day)
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else:
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if Hebrew.monthsPerYear[(Year - 1) % 19] == 13:
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Month = 7
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Day = inputDay - tishri1 + 207
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if Day > 0:
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return (Year,Month,Day)
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Month = Month - 1
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Day = Day + 30
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if Day > 0:
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return (Year,Month,Day)
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Month = Month - 1
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Day = Day + 30
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else:
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Month = 6
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Day = inputDay - tishri1 + 207
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if Day > 0:
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return (Year,Month,Day)
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Month = Month - 1
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Day = Day + 30
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if Day > 0:
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return (Year,Month,Day)
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Month = Month - 1
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Day = Day + 29
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if Day > 0:
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return (Year,Month,Day)
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# We need the length of the year to figure this out, so find
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# Tishri 1 of this year
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tishri1After = tishri1;
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(metonicCycle,metonicYear,day,halakim) = self.TishriMolad(day-365)
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tishri1 = self.Tishri1(metonicYear, day, halakim)
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yearLength = tishri1After - tishri1;
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cday = inputDay - tishri1 - 29;
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if yearLength == 355 or yearLength == 385 :
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# Heshvan has 30 days
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if day <= 30:
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Month = 2
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Day = cday
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return (Year,Month,Day)
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day = day - 30
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else:
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# Heshvan has 29 days
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if day <= 29:
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Month = 2
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Day = cday
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return (Year,Month,Day)
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cday = cday - 29
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# It has to be Kislev
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return (Year,3,cday)
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def get_sdn(self,year, month, day):
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"""Converts a Jewish calendar date to an SDN number"""
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if year <= 0 or day <= 0 or day > 30 :
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return 0
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if month == 1 or month == 2:
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# It is Tishri or Heshvan - don't need the year length.
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(metonicCycle,metonicYear,moladDay,moladHalakim,tishri1) = self.StartOfYear(year)
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if month == 1:
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sdn = tishri1 + day - 1
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else:
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sdn = tishri1 + day + 29
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elif month == 3:
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# It is Kislev - must find the year length.
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# Find the start of the year.
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(metonicCycle,metonicYear,moladDay,moladHalakim,tishri1) = self.StartOfYear(year)
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# Find the end of the year.
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moladHalakim = moladHalakim + (Hebrew.HALAKIM_PER_LUNAR_CYCLE*Hebrew.monthsPerYear[metonicYear])
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moladDay = moladDay + (moladHalakim / Hebrew.HALAKIM_PER_DAY)
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moladHalakim = moladHalakim % Hebrew.HALAKIM_PER_DAY
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tishri1After = self.Tishri1((metonicYear + 1) % 19, moladDay, moladHalakim)
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yearLength = tishri1After - tishri1
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if yearLength == 355 or yearLength == 385:
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sdn = tishri1 + day + 59
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else:
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sdn = tishri1 + day + 58
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elif month == 4 or month == 5 or month == 6:
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# It is Tevet, Shevat or Adar I - don't need the year length
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(metonicCycle,metonicYear,moladDay,moladHalakim,tishri1After) = self.StartOfYear(year+1)
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if Hebrew.monthsPerYear[(year - 1) % 19] == 12:
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lengthOfAdarIAndII = 29
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else:
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lengthOfAdarIAndII = 59
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if month == 4:
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sdn = tishri1After + day - lengthOfAdarIAndII - 237
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elif month == 5:
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sdn = tishri1After + day - lengthOfAdarIAndII - 208
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else:
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sdn = tishri1After + day - lengthOfAdarIAndII - 178
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else:
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# It is Adar II or later - don't need the year length.
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(metonicCycle,metonicYear,moladDay,moladHalakim,tishri1After) = self.StartOfYear(year+1)
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if month == 7:
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sdn = tishri1After + day - 207
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elif month == 8:
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sdn = tishri1After + day - 178
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elif month == 9:
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sdn = tishri1After + day - 148
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elif month == 10:
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sdn = tishri1After + day - 119
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elif month == 11:
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sdn = tishri1After + day - 89
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elif month == 12:
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sdn = tishri1After + day - 60
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elif month == 13:
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sdn = tishri1After + day - 30
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else:
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return 0
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return sdn + Hebrew.SDN_OFFSET
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Calendar.register(Hebrew)
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