parseLatitudeOrLongitudeValue static method

num? parseLatitudeOrLongitudeValue(String? s, [ bool onlyWithCardinals = false ])

Implementation

static num? parseLatitudeOrLongitudeValue(String? s,
    [bool onlyWithCardinals = false]) {
  if (s == null) return null;

  var match = geolocationFormat.firstMatch(s);
  if (match == null) return null;

  var signal = match.group(1);
  var number = match.group(2);
  var cardinal = match.group(3);

  if (signal != null && signal.isNotEmpty) {
    if (onlyWithCardinals) return null;
    return double.parse('$signal$number');
  } else if (cardinal != null && cardinal.isNotEmpty) {
    cardinal = cardinal.toUpperCase();

    switch (cardinal) {
      case 'N':
        return double.parse('$number');
      case 'S':
        return double.parse('-$number');
      case 'E':
        return double.parse('$number');
      case 'W':
        return double.parse('-$number');
    }
  }

  if (onlyWithCardinals) return null;
  return number != null ? double.parse(number) : null;
}