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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")
ALMPROP = oneOf("TRIGGER")
EVTPROP = oneOf("X-MOZILLA-RECUR-DEFAULT-INTERVAL \
X-MOZILLA-RECUR-DEFAULT-UNITS \
UID DTSTAMP LAST-MODIFIED X RRULE EXDATE")
propval = Word(valstr)
typeval = Word(valstr)
typename = oneOf("VALUE MEMBER FREQ UNTIL INTERVAL")
proptype = Group(SEMI + typename + EQ + typeval).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") \
calprops = Group(OneOrMore(calprop)).suppress()
evtprops = Group(OneOrMore(evtprop))
almprops = Group(OneOrMore(almprop)).suppress()
alarm = BEGIN + ALARM + almprops + END + ALARM
event = BEGIN + EVENT + evtprops + Optional(alarm) + END + EVENT
events = Group(OneOrMore(event))
calendar = BEGIN + CALENDAR + calprops + ZeroOrMore(event) + END + 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")
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