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compat.py

# -*-python-*-
#
# Copyright (C) 1999-2006 The ViewCVS Group. All Rights Reserved.
#
# By using this file, you agree to the terms and conditions set forth in
# the LICENSE.html file which can be found at the top level of the ViewVC
# distribution or at http://viewvc.org/license-1.html.
#
# For more information, visit http://viewvc.org/
#
# -----------------------------------------------------------------------
#
# compat.py: compatibility functions for operation across Python 1.5.x to 2.2.x
#
# -----------------------------------------------------------------------

import urllib
import string
import time
import calendar
import re
import os
import rfc822
import tempfile
import errno

#
# urllib.urlencode() is new to Python 1.5.2
#
try:
  urlencode = urllib.urlencode
except AttributeError:
  def urlencode(dict):
    "Encode a dictionary as application/x-url-form-encoded."
    if not dict:
      return ''
    quote = urllib.quote_plus
    keyvalue = [ ]
    for key, value in dict.items():
      keyvalue.append(quote(key) + '=' + quote(str(value)))
    return string.join(keyvalue, '&')

#
# time.strptime() is new to Python 1.5.2
#
if hasattr(time, 'strptime'):
  def cvs_strptime(timestr):
    'Parse a CVS-style date/time value.'
    return time.strptime(timestr, '%Y/%m/%d %H:%M:%S')[:-1] + (0,)
else:
  _re_rev_date = re.compile('([0-9]{4})/([0-9][0-9])/([0-9][0-9]) '
                            '([0-9][0-9]):([0-9][0-9]):([0-9][0-9])')
  def cvs_strptime(timestr):
    'Parse a CVS-style date/time value.'
    match = _re_rev_date.match(timestr)
    if match:
      return tuple(map(int, match.groups())) + (0, 1, 0)
    else:
      raise ValueError('date is not in cvs format')

#
# os.makedirs() is new to Python 1.5.2
#
try:
  makedirs = os.makedirs
except AttributeError:
  def makedirs(path, mode=0777):
    head, tail = os.path.split(path)
    if head and tail and not os.path.exists(head):
      makedirs(head, mode)
    os.mkdir(path, mode)

#
# rfc822.formatdate() is new to Python 1.6
#
try:
  formatdate = rfc822.formatdate
except AttributeError:
  def formatdate(timeval):
    if timeval is None:
      timeval = time.time()
    timeval = time.gmtime(timeval)
    return "%s, %02d %s %04d %02d:%02d:%02d GMT" % (
            ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"][timeval[6]],
            timeval[2],
            ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
             "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"][timeval[1]-1],
                                timeval[0], timeval[3], timeval[4], timeval[5])

# 
# calendar.timegm() is new to Python 2.x and 
# calendar.leapdays() was wrong in Python 1.5.2
#
try:
  timegm = calendar.timegm 
except AttributeError:
  def leapdays(year1, year2):
    """Return number of leap years in range [year1, year2).
       Assume year1 <= year2."""
    year1 = year1 - 1
    year2 = year2 - 1
    return (year2/4 - year1/4) - (year2/100 - 
                                  year1/100) + (year2/400 - year1/400)

  EPOCH = 1970
  def timegm(tuple):
    """Unrelated but handy function to calculate Unix timestamp from GMT."""
    year, month, day, hour, minute, second = tuple[:6]
    # assert year >= EPOCH
    # assert 1 <= month <= 12
    days = 365*(year-EPOCH) + leapdays(EPOCH, year)
    for i in range(1, month):
      days = days + calendar.mdays[i]
    if month > 2 and calendar.isleap(year):
      days = days + 1
    days = days + day - 1
    hours = days*24 + hour
    minutes = hours*60 + minute
    seconds = minutes*60 + second
    return seconds

#
# tempfile.mkdtemp() is new to Python 2.3
#
try:
  mkdtemp = tempfile.mkdtemp
except AttributeError:
  def mkdtemp():
    for i in range(10):
      dir = tempfile.mktemp()
      try:
        os.mkdir(dir, 0700)
        return dir
      except OSError, e:
        if e.errno == errno.EEXIST:
          continue # try again
        raise

    raise IOError, (errno.EEXIST, "No usable temporary directory name found")

# 
# the following stuff is *ONLY* needed for standalone.py.
# For that reason I've encapsulated it into a function.
#

def for_standalone():
  import SocketServer
  if not hasattr(SocketServer.TCPServer, "close_request"):
    #
    # method close_request() was missing until Python 2.1
    #
    class TCPServer(SocketServer.TCPServer):
      def process_request(self, request, client_address):
        """Call finish_request.

        Overridden by ForkingMixIn and ThreadingMixIn.

        """
        self.finish_request(request, client_address)
        self.close_request(request)

      def close_request(self, request):
        """Called to clean up an individual request."""
        request.close()

    SocketServer.TCPServer = TCPServer

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