text: from pyparsing import (
      Optional,
      oneOf,
      Literal,
      Word,
      printables,
      Group,
      OneOrMore,
      ZeroOrMore,
  )
  
  """
  A simple parser for calendar (*.ics) files,
  as exported by the Mozilla calendar.
  
  Any suggestions and comments welcome.
  
  Version:   0.1
  Copyright: Petri Savolainen <firstname.lastname@iki.fi>
  License:   Free for any use
  """
  
  
  # TERMINALS
  
  BEGIN = Literal("BEGIN:").suppress()
  END = Literal("END:").suppress()
  valstr = printables + "\xe4\xf6\xe5\xd6\xc4\xc5 "
  
  EQ = Literal("=").suppress()
  SEMI = Literal(";").suppress()
  COLON = Literal(":").suppress()
  
  EVENT = Literal("VEVENT").suppress()
  CALENDAR = Literal("VCALENDAR").suppress()
  ALARM = Literal("VALARM").suppress()
  
  # TOKENS
  
  CALPROP = oneOf("VERSION PRODID METHOD", asKeyword=True)
  ALMPROP = oneOf("TRIGGER", asKeyword=True)
  EVTPROP = oneOf(
      """X-MOZILLA-RECUR-DEFAULT-INTERVAL
         X-MOZILLA-RECUR-DEFAULT-UNITS
         UID DTSTAMP LAST-MODIFIED X RRULE EXDATE""", asKeyword=True
  )
  
  valuestr = Word(valstr).setName("valuestr")
  propval = valuestr
  typeval = valuestr
  typename = oneOf("VALUE MEMBER FREQ UNTIL INTERVAL", asKeyword=True)
  
  proptype = Group(SEMI + typename + EQ + typeval).setName("proptype").suppress()
  
  calprop = Group(CALPROP + ZeroOrMore(proptype) + COLON + propval)
  almprop = Group(ALMPROP + ZeroOrMore(proptype) + COLON + propval)
  evtprop = (
      Group(EVTPROP + ZeroOrMore(proptype) + COLON + propval).suppress()
      | "CATEGORIES" + COLON + propval.setResultsName("categories")
      | "CLASS" + COLON + propval.setResultsName("class")
      | "DESCRIPTION" + COLON + propval.setResultsName("description")
      | "DTSTART" + proptype + COLON + propval.setResultsName("begin")
      | "DTEND" + proptype + COLON + propval.setResultsName("end")
      | "LOCATION" + COLON + propval.setResultsName("location")
      | "PRIORITY" + COLON + propval.setResultsName("priority")
      | "STATUS" + COLON + propval.setResultsName("status")
      | "SUMMARY" + COLON + propval.setResultsName("summary")
      | "URL" + COLON + propval.setResultsName("url")
  ).setName("evtprop")
  calprops = Group(OneOrMore(calprop)).setName("calprops").suppress()
  evtprops = Group(OneOrMore(evtprop))
  almprops = Group(OneOrMore(almprop)).setName("almprops").suppress()
  
  alarm = (BEGIN + ALARM + almprops + END + ALARM).setName("alarm")
  event = (BEGIN + EVENT + evtprops + Optional(alarm) + END + EVENT).setName("event")
  events = Group(OneOrMore(event))
  calendar = (BEGIN + CALENDAR + calprops + ZeroOrMore(event) + END + CALENDAR).setName("calendar")
  calendars = OneOrMore(calendar)
  
  
  # PARSE ACTIONS
  
  
  def gotEvent(s, loc, toks):
      for event in toks:
          print(event.dump())
  
  
  event.setParseAction(gotEvent)
  
  
  # MAIN PROGRAM
  
  if __name__ == "__main__":
  
      calendars.parseFile("mozilla.ics")
  