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#
# zonetab.py: timezone classes
#
# Copyright 2001, 2002, 2003 Red Hat, Inc.
#
# This software may be freely redistributed under the terms of the GNU
# library public license.
#
# You should have received a copy of the GNU Library Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
#Originally written by Matt Wilson <msw@redhat.com>
#Additions by Brent Fox <bfox@redhat.com>
import string
import re
import math
class ZoneTabEntry:
def __init__ (self, code=None, lat=None, long=None, tz=None, comments=None):
self.code = code
self.lat = lat
self.long = long
self.tz = tz
self.comments = comments
class ZoneTab:
def __init__ (self, fn='/usr/share/zoneinfo/zone.tab'):
self.entries = []
self.readZoneTab (fn)
self.addNoGeoZones ()
def getEntries (self):
return self.entries
def findEntryByTZ (self, tz):
for entry in self.entries:
if entry.tz == tz:
return entry
return None
def findNearest (self, long, lat, longmin, latmin, longmax, latmax):
#print "findNearest:", long, lat, longmin, longmax, longmax, latmax
nearestEntry = None
if longmin <= long <= longmax and latmin <= lat <= latmax:
min = -1
for entry in self.entries:
if not (entry.lat and entry.long and latmin <= entry.lat <= latmax and longmin <= entry.long <= longmax):
continue
dx = entry.long - long
dy = entry.lat - lat
dist = (dy * dy) + (dx * dx)
if dist < min or min == -1:
min = dist
nearestEntry = entry
return nearestEntry
def convertCoord (self, coord, type="lat"):
if type != "lat" and type != "long":
raise TypeError, "invalid coord type"
if type == "lat":
deg = 3
else:
deg = 4
degrees = string.atoi (coord[0:deg])
order = len (coord[deg:])
minutes = string.atoi (coord[deg:])
if degrees > 0:
return degrees + minutes/math.pow (10, order)
return degrees - minutes/math.pow (10, order)
def readZoneTab (self, fn):
f = open (fn, 'r')
comment = re.compile ("^#")
coordre = re.compile ("[\+-]")
while 1:
line = f.readline ()
if not line:
break
if comment.search (line):
continue
fields = string.split (line, '\t')
if len (fields) < 3:
continue
code = fields[0]
split = coordre.search (fields[1], 1)
lat = self.convertCoord (fields[1][:split.end () - 1], "lat")
long = self.convertCoord (fields[1][split.end () - 1:], "long")
tz = string.strip (fields[2])
if len (fields) > 3:
comments = string.strip (fields[3])
else:
comments = None
entry = ZoneTabEntry (code, lat, long, tz, comments)
self.entries.append (entry)
def addNoGeoZones (self):
nogeotzs = ['UTC']
for offset in xrange (-14, 13):
if offset < 0:
tz = 'GMT%d' % offset
elif offset > 0:
tz = 'GMT+%d' % offset
else:
tz = 'GMT'
nogeotzs.append (tz)
for tz in nogeotzs:
self.entries.append (ZoneTabEntry (None, None, None, "Etc/" + tz, None))
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