/// <summary>
/// Parse a text to a GPS location.
/// </summary>
/// <param name="text">the text to parse</param>
/// <param name="format">the format to use, to determine the decimal separator</param>
/// <param name="result">the parsed GPS location</param>
internal static bool TryParse(string text, NumberFormatInfo format, out GpsLocation result)
{
var parser = new GpsLocationParser(text, format);
var parsed = parser.Execute();
result = parsed.Item2;
return(parsed.Item1);
}
private Tuple <bool, GpsLocation> Execute()
{
var invalid = Tuple.Create(false, new GpsLocation());
var latitude = 0.0;
var longitude = 0.0;
if (HasDegreeSymbol)
{
(var lat, var lon) = SplitOnNorthSouth(Text);
var latPos = IsPositive(lat);
var lonPos = IsPositive(lon);
(var latDeg, var latDegRest) = SplitOnDegreeSymbol(lat);
(var lonDeg, var lonDegRest) = SplitOnDegreeSymbol(lon);
if (HasMinuteSymbol)
{
if (!TryParsePositiveInteger(latDeg, out var dLatDeg))
{
return(invalid);
}
if (!TryParsePositiveInteger(lonDeg, out var dLonDeg))
{
return(invalid);
}
latitude += dLatDeg;
longitude += dLonDeg;
(var latMin, var latMinRest) = SplitOnMinuteSymbol(latDegRest);
(var lonMin, var lonMinRest) = SplitOnMinuteSymbol(lonDegRest);
if (HasSecondSymbol)
{
if (!TryParsePositiveInteger(latMin, out var dLatMin))
{
return(invalid);
}
if (!TryParsePositiveInteger(lonMin, out var dLonMin))
{
return(invalid);
}
latitude += (dLatMin / 60.0);
longitude += (dLonMin / 60.0);
// degrees, minutes, seconds
// 40° 26′ 46″ N 79° 58′ 56″ W
var latSec = SplitOnSecondSymbol(latMinRest);
var lonSec = SplitOnSecondSymbol(lonMinRest);
if (!TryParsePositiveFloat(latSec, out var dLatSec))
{
return(invalid);
}
if (!TryParsePositiveFloat(lonSec, out var dLonSec))
{
return(invalid);
}
latitude += (dLatSec / 3600.0);
longitude += (dLonSec / 3600.0);
}
else
{
if (!TryParsePositiveFloat(latMin, out var dLatMin))
{
return(invalid);
}
if (!TryParsePositiveFloat(lonMin, out var dLonMin))
{
return(invalid);
}
latitude += (dLatMin / 60.0);
longitude += (dLonMin / 60.0);
}
}
else
{
if (!TryParsePositiveFloat(latDeg, out var dLatDeg))
{
return(invalid);
}
if (!TryParsePositiveFloat(lonDeg, out var dLonDeg))
{
return(invalid);
}
latitude += dLatDeg;
longitude += dLonDeg;
}
latitude *= latPos;
longitude *= lonPos;
}
else
{
if (HasDirection)
{
// decimal format with direction
// 40.55 N 79.95 W
(var lat, var lon) = SplitOnNorthSouth(Text);
var latPos = IsPositive(lat);
var lonPos = IsPositive(lon);
if (!TryParsePositiveFloat(lat, out latitude))
{
return(invalid);
}
if (!TryParsePositiveFloat(lon, out longitude))
{
return(invalid);
}
latitude *= latPos;
longitude *= lonPos;
}
else
{
// decimal format with direction
// -40.55 79.95
(var lat, var lon) = SplitOnSeparatorSymbol(Text);
if (!TryParseFloat(lat, out latitude))
{
return(invalid);
}
if (!TryParseFloat(lon, out longitude))
{
return(invalid);
}
}
}
if (!GpsLocation.ValidateLatitude(latitude))
{
return(invalid);
}
if (!GpsLocation.ValidateLongitude(longitude))
{
return(invalid);
}
return(Tuple.Create(true, new GpsLocation(latitude, longitude)));
}
