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);
}
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
var text = value as string;
if (string.IsNullOrWhiteSpace(text))
{
return(null);
}
var settings = Settings.Instance;
var pos = 0;
_ = WhiteSpaceReader.TryRead(text, ref pos);
var indexOf = text.IndexOf("1/", pos, StringComparison.Ordinal);
if (indexOf >= 0)
{
pos = indexOf + 2;
}
if (SymbolAndPowerReader.TryRead(text, ref pos, out IReadOnlyList <SymbolAndPower> result))
{
if (WhiteSpaceReader.IsRestWhiteSpace(text, pos))
{
var unitAndPowers = result.Select(sap => UnitAndPower.Create(settings.AllUnits.Single(x => x.Symbol == sap.Symbol), sap.Power))
.ToList();
var unitParts = new UnitParts(unitAndPowers);
if (indexOf < 0)
{
return(unitParts);
}
return(unitParts.Inverse());
}
}
return(text);
}
internal static PaddedFormat GetOrCreate(string?format)
{
if (string.IsNullOrEmpty(format))
{
return(PaddedFormat.NullFormat);
}
if (Cache.TryGet(format, out var match))
{
return(match);
}
var pos = 0;
var paddedFormat = GetOrCreate(format, ref pos);
if (!WhiteSpaceReader.IsRestWhiteSpace(format, pos))
{
paddedFormat = paddedFormat.AsUnknownFormat();
}
_ = Cache.Add(format, paddedFormat);
return(paddedFormat);
}