parse static method

VTimezone parse(String vtimezoneString)

Implementation

static VTimezone parse(String vtimezoneString) {
  final lines = vtimezoneString.split('\n');
  String? tzid;
  Duration? standardOffset;
  Duration? daylightOffset;
  DateTime? standardStart;
  DateTime? daylightStart;

  for (var line in lines) {
    final parts = line.split(':');
    if (parts.length < 2) continue;
    final key = parts[0];
    final value = parts.getRange(1, parts.length).join(':');

    switch (key) {
      case 'TZID':
        tzid = value;
        break;
      case 'TZOFFSETFROM':
        standardOffset = parseOffsetToDuration(value);
        break;
      case 'TZOFFSETTO':
        daylightOffset = parseOffsetToDuration(value);
        break;
      case 'DTSTART':
        if (line.contains("STANDARD")) {
          standardStart = DateTime.parse(value.replaceAll('Z', ''));
        } else if (line.contains("DAYLIGHT")) {
          daylightStart = DateTime.parse(value.replaceAll('Z', ''));
        }
        break;
    }
  }

  return VTimezone(
    tzid: tzid ?? '',
    standardOffset: standardOffset,
    daylightOffset: daylightOffset,
    standardStart: standardStart,
    daylightStart: daylightStart,
  );
}