icalendar.py 文件源码

def gettzinfo(self):
        # workaround for dateutil failing to parse some experimental properties
        good_lines = ('rdate', 'rrule', 'dtstart', 'tzname', 'tzoffsetfrom',
                      'tzoffsetto', 'tzid')
        # serialize encodes as utf-8, cStringIO will leave utf-8 alone
        buffer = six.StringIO()
        # allow empty VTIMEZONEs
        if len(self.contents) == 0:
            return None

        def customSerialize(obj):
            if isinstance(obj, Component):
                foldOneLine(buffer, u"BEGIN:" + obj.name)
                for child in obj.lines():
                    if child.name.lower() in good_lines:
                        child.serialize(buffer, 75, validate=False)
                for comp in obj.components():
                    customSerialize(comp)
                foldOneLine(buffer, u"END:" + obj.name)
        customSerialize(self)
        buffer.seek(0)  # tzical wants to read a stream
        return tz.tzical(buffer).get()