Package pyxmpp :: Module utils

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# Source Code for Module pyxmpp.utils

      1  #
      2  # (C) Copyright 2003-2010 Jacek Konieczny <jajcus@jajcus.net>
      3  #
      4  # This program is free software; you can redistribute it and/or modify
      5  # it under the terms of the GNU Lesser General Public License Version
      6  # 2.1 as published by the Free Software Foundation.
      7  #
      8  # This program is distributed in the hope that it will be useful,
      9  # but WITHOUT ANY WARRANTY; without even the implied warranty of
     10  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     11  # GNU Lesser General Public License for more details.
     12  #
     13  # You should have received a copy of the GNU Lesser General Public
     14  # License along with this program; if not, write to the Free Software
     15  # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
     16  #
     17
     18  """Utility functions for the pyxmpp package."""
     19
     20  __docformat__="restructuredtext en"
     21
     22  import sys
     23
     24  if sys.hexversion<0x02030000:
     25      raise ImportError,"Python 2.3 or newer is required"
     26
     27  import time
     28  import datetime
     29
     30 -def to_utf8(s):
     31      """
     32      Convevert `s` to UTF-8 if it is Unicode, leave unchanged
     33      if it is string or None and convert to string overwise
     34      """
     35      if s is None:
     36          return None
     37      elif type(s) is unicode:
     38          return s.encode("utf-8")
     39      elif type(s) is str:
     40          return s
     41      else:
     42          return unicode(s).encode("utf-8")
     43
     44 -def from_utf8(s):
     45      """
     46      Convert `s` to Unicode or leave unchanged if it is None.
     47
     48      Regular strings are assumed to be UTF-8 encoded
     49      """
     50      if s is None:
     51          return None
     52      elif type(s) is unicode:
     53          return s
     54      elif type(s) is str:
     55          return unicode(s,"utf-8")
     56      else:
     57          return unicode(s)
     58
     59  minute=datetime.timedelta(minutes=1)
     60  nulldelta=datetime.timedelta()
     61
     62 -def datetime_utc_to_local(utc):
     63      """
     64      An ugly hack to convert naive `datetime.datetime` object containing
     65      UTC time to a naive `datetime.datetime` object with local time.
     66      It seems standard Python 2.3 library doesn't provide any better way to
     67      do that.
     68      """
     69      ts=time.time()
     70      cur=datetime.datetime.fromtimestamp(ts)
     71      cur_utc=datetime.datetime.utcfromtimestamp(ts)
     72
     73      offset=cur-cur_utc
     74      t=utc
     75
     76      d=datetime.timedelta(hours=2)
     77      while d>minute:
     78          local=t+offset
     79          tm=local.timetuple()
     80          tm=tm[0:8]+(0,)
     81          ts=time.mktime(tm)
     82          u=datetime.datetime.utcfromtimestamp(ts)
     83          diff=u-utc
     84          if diff<minute and diff>-minute:
     85              break
     86          if diff>nulldelta:
     87              offset-=d
     88          else:
     89              offset+=d
     90          d/=2
     91      return local
     92
     93 -def datetime_local_to_utc(local):
     94      """
     95      Simple function to convert naive `datetime.datetime` object containing
     96      local time to a naive `datetime.datetime` object with UTC time.
     97      """
     98      ts=time.mktime(local.timetuple())
     99      return datetime.datetime.utcfromtimestamp(ts)
    100
    101  # vi: sts=4 et sw=4
    102