Python implementation of strptime().

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+""" strptime version 1.3, Time-stamp: <96/09/23 21:22:24 flognat>
+               The reverse of strftime.
+
+    Copyright (C) 1996 Andy Eskilsson, flognat@fukt.hk-r.se
+
+    This is free software; unrestricted redistribution is allowed under the
+    terms of the GPL.  For full details of the license conditions of this
+    software, see the GNU General Public License.
+
+    And here comes the documentation:
+
+    Throw a string and a format specification at strptime and if everything
+    is ok you will get a tuple containing 9 items that are compatible with
+    pythons time-module.
+
+    interface:
+       strptime(inputstring, formatstring)
+
+       Little errorchecking... so you'd better know what you are doing.
+
+    example:
+       from strptime import *
+       mktime(strptime("26/6 1973", "%d/%m %Y"))
+
+    And voila you have the second when the author of this function was born.
+
+    The supported format identifiers are:
+        %a weekday in short text-form, e.g. Mon
+	%A weekday in long text-form, e.g. Monday
+	%b month in short text-form, e.g. Jul
+	%B month in long text-form e.g. July
+	%c the format specified by DateAndTimeRepresentation
+	%d the day in month in numeric form, e.g. 24
+	%H hour in 24 hour form
+	%j julian day (day of year)
+	%m month in numeric format
+	%M minute
+	%S second
+	%T Time in '%H:%M:%S'-format
+	%w weekday, 0=monday
+	%x date in format represented by DateRepresentation
+	%X time in format represented by TimeRepresentation
+	%y year in short form
+	%Y year in long form
+	%% %-sign
+
+    I have done some thinking here (*REALLY*) and it is possible to configure
+    this module so it uses other languages by adding their names to the
+    dictionaries first in the file, and setting the variable LANGUAGE.
+
+    For your exercise I have inserted the swedish names ;-)
+
+    The lfind, name, complex, numbers and parse functions are for internal
+    use, called by strptime.
+
+    Uh.. oh yeah.. if you want to get in touch with me.. I am reachable
+    at flognat@fukt.hk-r.se, the newest version of this file can probably
+    be found somewhere close to http://www.fukt.hk-r.se/~flognat
+
+    If you like it, send a postcard to Andy Eskilsson
+                                       Kämnärsv. 3b228
+				       S-226 46 Lund
+				       Sweden
+
+    Uhm be gentle with the bug-reports, its the first time for me ;-)
+
+    """
+
+import string
+
+LongDayNames={ 'English' : [ 'Monday', 'Tuesday', 'Wednesday',
+			     'Thursday', 'Friday', 'Saturday', 'Sunday'],
+	       'Swedish' : [ 'Måndag', 'Tisdag', 'Onsdag', 'Torsdag',
+			     'Fredag', 'Lördag', 'Söndag']}
+ShortDayNames={ 'English' : [ 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'],
+		'Swedish' : [ 'Mån', 'Tis', 'Ons', 'Tor', 'Fre', 'Lör', 'Sön']}
+
+LongMonthNames={ 'English' : ['none', 'January', 'February', 'March', 'April',
+			      'May', 'June', 'July', 'August', 'September',
+			      'October', 'November', 'December'],
+		 'Swedish' : ['none', 'Januari', 'Februari', 'Mars', 'April',
+			      'Maj', 'Juni', 'Juli', 'Augusti','September',
+			      'Oktober', 'November', 'December'] }
+ShortMonthNames={ 'English' : ['none', 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
+			       'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
+		  'Swedish' : ['none', 'Jan', 'Feb', 'Mar', 'Apr', 'Maj', 'Jun',
+			       'Jul', 'Aug', 'Sep', 'Okt', 'Nov', 'Dec']}
+DateAndTimeRepresentation={ 'English' : '%a %b %d %H:%m:%S %Y',
+			    'Swedish' : '%a %d %b %Y %H:%m:%S' }
+
+DateRepresentation = { 'English' : '%m/%d/%y',
+		       'Swedish' : '%d/%m/%y'}
+
+TimeRepresentation = { 'English' : '%H:%M:%S',
+		       'Swedish' : '%H:%M:%S'}
+
+LANGUAGE='English'
+
+BadFormatter='An illegal formatter was given'
+
+#Check if strinf begins with substr
+def lfind(str, substr):
+   return string.lower(str[:len(substr)])==string.lower(substr)
+
+#atoms consisting of other atoms
+def complex(str, format, base):
+   code=format[:1]
+   if code=='c': 
+      string=DateAndTimeRepresentation[LANGUAGE]
+   elif code=='T':
+      string='%H:%M:%S'
+   elif code=='x':
+      string=DateRepresentation[LANGUAGE]
+   elif code=='X':
+      string=TimeRepresentation[LANGUAGE]
+
+   return parse(str, string, base)
+
+#string based names
+def names(str, format, base):
+   code=format[:1]
+   if code=='a':
+      selection=ShortDayNames[LANGUAGE]
+      result='weekd'
+   elif code=='A':
+      selection=LongDayNames[LANGUAGE]
+      result='weekd'
+   elif code=='b':
+      selection=ShortMonthNames[LANGUAGE]
+      result='month'
+   elif code=='B':
+      selection=LongMonthNames[LANGUAGE]
+      result='month'
+   
+   match=None
+   for i in selection:
+      if lfind(str, i):
+	 match=i
+	 break
+
+   base[result]=selection.index(match)
+   return len(match)
+
+#numeric stuff
+def numeric(str, format, base):
+   code=format[:1]
+   if code=='d': result='day'
+   elif code=='H': result='hour'
+   elif code=='j': result='juliand'
+   elif code=='m': result='month'
+   elif code=='M': result='min'
+   elif code=='S': result='sec'
+   elif code=='w': result='weekd'
+   elif code=='y': result='shortYear'
+   elif code=='Y': result='year'
+
+   i=0
+   while str[i] in string.whitespace: i=i+1
+   j=i
+   if len(format)>1:
+      while not str[j] in string.whitespace and str[j]!=format[1]: j=j+1
+   else:
+      try:
+	 while not str[j] in string.whitespace: j=j+1
+      except IndexError:
+	 pass
+
+   # hmm could check exception here, but what could I add?
+   base[result]=string.atoi(str[i:j])
+   
+   return j
+
+parseFuns={ 'a':names, 'A':names, 'b':names, 'B':names, 'c':complex, 'd':numeric,
+	    'H':numeric, 'j':numeric, 'm':numeric, 'M':numeric, 'S':numeric,
+	    'T':complex, 'w':numeric, 'x':complex, 'y':numeric, 'Y':numeric}
+
+# Well split up in atoms, reason to why this is separated from atrptime
+# is to be able to reparse complex atoms
+def parse(str, format, base):
+   atoms=string.split(format, '%')
+   charCounter=0
+   atomCounter=0
+
+   # Hey I am laazy and think that the format is exactly what the string is!
+   charCounter=charCounter+len(atoms[atomCounter])
+   atomCounter=atomCounter+1
+
+   while atomCounter < len(atoms) and charCounter < len(str):
+      atom=atoms[atomCounter]
+
+      if atom=='': # escaped
+	 charCounter=charCounter+1
+	 atomCounter=atomCounter+1
+	 charCounter=charCounter+len(atoms[atomCounter])
+      else:
+	 try:
+	    parsefunction=parseFuns[atom[:1]]
+	 except KeyError:
+	    raise BadFormatter, atom[:1]
+	 grabbed=apply(parsefunction, (str[charCounter:], atom, base))
+	 charCounter=charCounter+grabbed+len(atom)-1
+
+      atomCounter=atomCounter+1
+
+   return charCounter
+
+# Ok here we go, tadaaa --> STRPTIME <-- at last..
+def strptime(str, format):
+   """Converts str specified by format to tuple useable by the time module"""
+   returnTime={}
+   returnTime['year']=0
+   returnTime['shortYear']=None
+   returnTime['month']=0
+   returnTime['day']=0
+   returnTime['hour']=0
+   returnTime['min']=0
+   returnTime['sec']=0
+   returnTime['weekd']=0
+   returnTime['juliand']=0
+   returnTime['dst']=0
+
+   parse(str, format, returnTime)
+
+   if returnTime['shortYear']!=None:
+      returnTime['year']=returnTime['shortYear']+1900
+
+   return (returnTime['year'], returnTime['month'], returnTime['day'],
+	   returnTime['hour'], returnTime['min'], returnTime['sec'],
+	   returnTime['weekd'], returnTime['juliand'], returnTime['dst'])
+
+# just for my convenience
+def strpdebug():
+   import pdb
+   pdb.run('strptime("% Tue 3 Feb", "%% %a %d %b")')
+
+def test():
+   from time import *
+   a=asctime(localtime(time()))
+   print a
+   b=strptime(a, '%a %b %d %H:%M:%S %Y')
+   print asctime(b)
+   print strptime("%% % Tue 3 Feb", "%%%% %% %a %d %b")
+   print strptime('Thu, 12 Sep 1996 19:42:06 GMT', '%a, %d %b %Y %T GMT')
+   print strptime('Thu, 12 Sep 1996 19:42:06 GMT', '%a, %d %b %Y %T')
+   print strptime('Thu, 12 Sep 1996 19:42:06', '%a, %d %b %Y %T')
+   
+if __name__ == '__main__':
+   test()
+
+