Handle multiple recurrence exclude entries on the same EXDATE line

icalevents/icalparser.py

@@ -344,9 +344,10 @@ def parse_events(content, start=None, end=None, default_span=timedelta(days=7)):
     found = []
     recurrence_ids = []
 
-    # Skip dates that are stored as exceptions.
-    exceptions = {}
     for component in calendar.walk():
+        # Skip dates that are stored as exceptions.
+        exceptions = {}
+
         if component.name == "VEVENT":
             e = create_event(component, cal_tz)
 
@@ -359,7 +360,9 @@ def parse_events(content, start=None, end=None, default_span=timedelta(days=7)):
                 # Deal with the fact that sometimes it's a list and
                 # sometimes it's a singleton
                 exlist = []
-                if isinstance(component["EXDATE"], list):
+                if isinstance(component["EXDATE"], vDDDLists):
+                    exlist = component["EXDATE"].dts
+                elif isinstance(component["EXDATE"], list):
                     exlist = component["EXDATE"]
                 else:
                     exlist.append(component["EXDATE"])

test/test_data/multi_exdate_same_line_ms.ics

@@ -0,0 +1,47 @@
+BEGIN:VCALENDAR
+METHOD:PUBLISH
+PRODID:Microsoft Exchange Server 2010
+VERSION:2.0
+X-WR-CALNAME:Calendar
+BEGIN:VTIMEZONE
+TZID:Eastern Standard Time
+BEGIN:STANDARD
+DTSTART:16010101T020000
+TZOFFSETFROM:-0400
+TZOFFSETTO:-0500
+RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=1SU;BYMONTH=11
+END:STANDARD
+BEGIN:DAYLIGHT
+DTSTART:16010101T020000
+TZOFFSETFROM:-0500
+TZOFFSETTO:-0400
+RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=2SU;BYMONTH=3
+END:DAYLIGHT
+END:VTIMEZONE
+BEGIN:VEVENT
+DESCRIPTION:Test event that has an RRULE with multiple EXDATE
+RRULE:FREQ=WEEKLY;UNTIL=20220429T150000Z;INTERVAL=1;BYDAY=FR;WKST=MO
+EXDATE;TZID=Eastern Standard Time:20220318T110000,20220401T110000,20220408T
+ 110000
+UID:040000008200R00074P5O7101N82R00800000000R0Q793689428Q801000000000000000
+ 010000000QOPN4SS024R0264S9P0Q7OOQQ16PN399
+SUMMARY:Recurring With Exclusions
+DTSTART;TZID=Eastern Standard Time:20220311T110000
+DTEND;TZID=Eastern Standard Time:20220311T113000
+CLASS:PUBLIC
+PRIORITY:5
+DTSTAMP:20220330T125447Z
+TRANSP:OPAQUE
+STATUS:CONFIRMED
+SEQUENCE:0
+LOCATION:Microsoft Teams Meeting
+X-MICROSOFT-CDO-APPT-SEQUENCE:0
+X-MICROSOFT-CDO-BUSYSTATUS:BUSY
+X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY
+X-MICROSOFT-CDO-ALLDAYEVENT:FALSE
+X-MICROSOFT-CDO-IMPORTANCE:1
+X-MICROSOFT-CDO-INSTTYPE:1
+X-MICROSOFT-DONOTFORWARDMEETING:FALSE
+X-MICROSOFT-DISALLOW-COUNTER:FALSE
+END:VEVENT
+END:VCALENDAR

test/test_icalevents.py

@@ -425,7 +425,7 @@ def test_cest(self):
 
         evs = icalevents.events(file=ical, start=start, end=end)
 
-        self.assertEqual(len(evs), 115, "4 events in total")
+        self.assertEqual(len(evs), 116, "4 events in total")
 
     def test_transparent(self):
         ical = "test/test_data/transparent.ics"
@@ -450,3 +450,22 @@ def test_status_and_url(self):
         self.assertEqual(ev3.status, "CANCELLED")
         self.assertEqual(ev4.status, "CANCELLED")
         self.assertEqual(ev5.status, None)
+
+    def test_multi_exdate_same_line(self):
+        ical = "test/test_data/multi_exdate_same_line_ms.ics"
+        tz = gettz("America/New_York")
+        start = date(2022, 3, 1)
+        end = date(2022, 5, 1)
+
+        evs = icalevents.events(file=ical, start=start, end=end)
+
+        # parsing starts at 2022-03-01
+        self.assertEqual(evs[0].start, datetime(2022, 3, 11, 11, 0, 0, tzinfo=tz))
+        # 2022-03-18 is excluded by EXDATE rule
+        self.assertEqual(evs[1].start, datetime(2022, 3, 25, 11, 0, 0, tzinfo=tz))
+        # 2022-04-01 is excluded by EXDATE rule
+        # 2022-04-08 is excluded by EXDATE rule
+        self.assertEqual(evs[2].start, datetime(2022, 4, 15, 11, 0, 0, tzinfo=tz))
+        self.assertEqual(evs[3].start, datetime(2022, 4, 22, 11, 0, 0, tzinfo=tz))
+        self.assertEqual(evs[4].start, datetime(2022, 4, 29, 11, 0, 0, tzinfo=tz))
+        # parsing stops at 2022-05-01