Calendar updates

svn: r1247

gramps2/src/Gregorian.py

@@ -0,0 +1,132 @@
+#
+# Gramps - a GTK+/GNOME based genealogy program
+#
+# Copyright (C) 2001  Donald N. Allingham
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+"""
+Gregorian calendar module for GRAMPS. 
+
+The original algorithms for this module came from Scott E. Lee's
+C implementation. The original C source can be found at Scott's
+web site at http://www.scottlee.com
+"""
+
+__author__ = "Donald N. Allingham"
+__version__ = "$Revision$"
+
+#-------------------------------------------------------------------------
+#
+# Gramps Modules
+#
+#-------------------------------------------------------------------------
+import Calendar
+from intl import gettext as _
+
+#-------------------------------------------------------------------------
+#
+# Gregorian
+#
+#-------------------------------------------------------------------------
+class Gregorian(Calendar.Calendar):
+    """Gregorian Calendar"""
+
+    SDN_OFFSET         = 32045
+    DAYS_PER_5_MONTHS  = 153
+    DAYS_PER_4_YEARS   = 1461
+    DAYS_PER_400_YEARS = 146097
+
+    NAME = "Gregorian"
+    TNAME = _("Gregorian")
+
+    def quote_display(self,year,month,day,mode):
+        return self.display(year,month,day,mode)
+
+    def mlen(self):
+        return 3
+
+    def get_ymd(self,sdn):
+        """Converts an SDN number to a gregorial date"""
+        if sdn <= 0:
+            return (0,0,0)
+
+        temp = (Gregorian.SDN_OFFSET + sdn) * 4 - 1
+
+        # Calculate the century (year/100)
+        century = temp / Gregorian.DAYS_PER_400_YEARS
+
+        # Calculate the year and day of year (1 <= dayOfYear <= 366)
+
+        temp = ((temp % Gregorian.DAYS_PER_400_YEARS) / 4) * 4 + 3
+        year = (century * 100) + (temp / Gregorian.DAYS_PER_4_YEARS)
+        dayOfYear = (temp % Gregorian.DAYS_PER_4_YEARS) / 4 + 1
+        
+        # Calculate the month and day of month
+        temp = dayOfYear * 5 - 3
+        month = temp / Gregorian.DAYS_PER_5_MONTHS
+        day = (temp % Gregorian.DAYS_PER_5_MONTHS) / 5 + 1
+        
+        # Convert to the normal beginning of the year
+        if month < 10 :
+            month = month + 3
+        else:
+            year = year + 1
+            month = month - 9
+            
+        # Adjust to the B.C./A.D. type numbering
+
+        year = year - 4800
+        if year <= 0:
+            year = year - 1
+
+        return (year,month,day)
+
+    def get_sdn(self,iyear,imonth,iday):
+        """Converts a gregorian date to an SDN number"""
+        # check for invalid dates 
+        if iyear==0 or iyear<-4714 or imonth<=0 or imonth>12 or iday<=0 or iday>31:
+            return 0
+
+        # check for dates before SDN 1 (Nov 25, 4714 B.C.)
+        if iyear == -4714:
+            if imonth < 11 or imonth == 11 and iday < 25:
+                return 0
+
+        if iyear < 0:
+            year = iyear + 4801
+        else:
+            year = iyear + 4800
+
+        # Adjust the start of the year
+
+        if imonth > 2:
+            month = imonth - 3
+        else:
+            month = imonth + 9
+            year = year - 1
+
+        return( ((year / 100) * Gregorian.DAYS_PER_400_YEARS) / 4
+                + ((year % 100) * Gregorian.DAYS_PER_4_YEARS) / 4
+                + (month * Gregorian.DAYS_PER_5_MONTHS + 2) / 5
+                + iday
+                - Gregorian.SDN_OFFSET );
+
+    def check(self,year,month,day):
+        if year > 2100 or month > 12 or day > 31:
+            return 0
+        return 1
+
+Calendar.register(Gregorian)