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1"""Special parsing for calendar components."""
3from .component import ComponentIcalParser
6class CalendarIcalParser(ComponentIcalParser):
7 """A parser for calendar components."""
9 def prepare_components(self) -> None:
10 """Prepare the parsed components.
12 This handles timezone forward references.
13 """
14 all_timezones_so_far = True
15 for comp in self._components:
16 for component in comp.subcomponents:
17 if component.name == "VTIMEZONE":
18 if not all_timezones_so_far:
19 # If a preceding component refers to a VTIMEZONE
20 # defined later in the source string (forward
21 # references are allowed by RFC 5545), then the
22 # earlier component may have the wrong timezone
23 # attached.
24 # However, during computation of comps, all VTIMEZONEs
25 # observed do end up in the timezone cache. So simply
26 # re-running from_ical will rely on the cache for those
27 # forward references to produce the correct result.
28 # See test_create_america_new_york_forward_reference.
29 self.initialize_parsing()
30 self.parse_content_lines()
31 return
32 else:
33 all_timezones_so_far = False
36__all__ = ["CalendarIcalParser"]