internal static bool TryParse(string?format, [MaybeNullWhen(false)] out QuantityFormat <TUnit> result)
{
if (string.IsNullOrWhiteSpace(format))
{
result = QuantityFormat <TUnit> .CreateUnknown("{nameof(format) is null}", Unit <TUnit> .Default);
return(false);
}
if (Cache.TryGetValue(format, out result))
{
return(true);
}
var pos = 0;
_ = WhiteSpaceReader.TryRead(format, ref pos);
var end = format.Length;
if (TryReadPrefix(format, ref pos))
{
end = format.LastIndexOf('}');
if (end < 0)
{
result = QuantityFormat <TUnit> .CreateUnknown(format, Unit <TUnit> .Default);
return(false);
}
if (!WhiteSpaceReader.IsRestWhiteSpace(format, end + 1))
{
result = QuantityFormat <TUnit> .CreateUnknown(format, Unit <TUnit> .Default);
return(false);
}
}
var trimmedFormat = pos != end
? format.Substring(pos, end - pos)
: format;
var success = CompositeFormatParser.TryParse(trimmedFormat, out result);
if (success)
{
Cache.Add(format, result);
}
return(success);
}
