1from pyparsing import Optional, oneOf, Literal, Word, printables, Group, OneOrMore, ZeroOrMore
2
3"""
4A simple parser for calendar (*.ics) files,
5as exported by the Mozilla calendar.
6
7Any suggestions and comments welcome.
8
9Version:   0.1
10Copyright: Petri Savolainen <firstname.lastname@iki.fi>
11License:   Free for any use
12"""
13
14
15# TERMINALS
16
17BEGIN      =   Literal("BEGIN:").suppress()
18END        =   Literal("END:").suppress()
19valstr     =   printables + "\xe4\xf6\xe5\xd6\xc4\xc5 "
20
21EQ         =   Literal("=").suppress()
22SEMI       =   Literal(";").suppress()
23COLON      =   Literal(":").suppress()
24
25EVENT      =   Literal("VEVENT").suppress()
26CALENDAR   =   Literal("VCALENDAR").suppress()
27ALARM      =   Literal("VALARM").suppress()
28
29# TOKENS
30
31CALPROP   =   oneOf("VERSION PRODID METHOD")
32ALMPROP   =   oneOf("TRIGGER")
33EVTPROP   =   oneOf("X-MOZILLA-RECUR-DEFAULT-INTERVAL \
34                     X-MOZILLA-RECUR-DEFAULT-UNITS \
35                     UID DTSTAMP LAST-MODIFIED X RRULE EXDATE")
36
37propval   =   Word(valstr)
38typeval   =   Word(valstr)
39typename  =   oneOf("VALUE MEMBER FREQ UNTIL INTERVAL")
40
41proptype = Group(SEMI + typename + EQ + typeval).suppress()
42
43calprop = Group(CALPROP + ZeroOrMore(proptype) + COLON + propval)
44almprop = Group(ALMPROP + ZeroOrMore(proptype) + COLON + propval)
45evtprop = Group(EVTPROP + ZeroOrMore(proptype) + COLON + propval).suppress() \
46   | "CATEGORIES" + COLON + propval.setResultsName("categories") \
47   | "CLASS" + COLON + propval.setResultsName("class") \
48   | "DESCRIPTION" + COLON + propval.setResultsName("description") \
49   | "DTSTART" + proptype + COLON + propval.setResultsName("begin") \
50   | "DTEND" + proptype + COLON + propval.setResultsName("end") \
51   | "LOCATION" + COLON + propval.setResultsName("location") \
52   | "PRIORITY" + COLON + propval.setResultsName("priority") \
53   | "STATUS" + COLON + propval.setResultsName("status") \
54   | "SUMMARY" + COLON + propval.setResultsName("summary") \
55   | "URL" + COLON + propval.setResultsName("url") \
56
57calprops = Group(OneOrMore(calprop)).suppress()
58evtprops = Group(OneOrMore(evtprop))
59almprops = Group(OneOrMore(almprop)).suppress()
60
61alarm      = BEGIN + ALARM + almprops + END + ALARM
62event      = BEGIN + EVENT + evtprops + Optional(alarm) + END + EVENT
63events     = Group(OneOrMore(event))
64calendar   = BEGIN + CALENDAR + calprops + ZeroOrMore(event) + END + CALENDAR
65calendars  =   OneOrMore(calendar)
66
67
68# PARSE ACTIONS
69
70def gotEvent(s,loc,toks):
71   for event in toks:
72      print(event.dump())
73
74event.setParseAction(gotEvent)
75
76
77# MAIN PROGRAM
78
79if __name__=="__main__":
80
81   calendars.parseFile("mozilla.ics")
82