public CssSizeLength(string value)
{
value = value?.ToLowerInvariant() ?? throw new ArgumentNullException(nameof(value));
_stringValue = value;
if (value.StartsWith("calc", StringComparison.OrdinalIgnoreCase))
{
_stringValue = value;
_value = null;
_unit = CssSizeLengthUnit.Calc;
return;
}
var index = value
.Select((c, i) => ((char c, int i)?)(c, i))
.FirstOrDefault(x => !(x.Value.c == '.' || x.Value.c >= '0' && x.Value.c <= '9'))
?.i
?? value.Length;
if (index == 0)
{
throw new FormatException();
}
_value = int.Parse(value.Substring(0, index), CultureInfo.InvariantCulture);
if (index == value.Length)
{
_unit = CssSizeLengthUnit.Px;
_stringValue = null;
return;
}
var unit = value.Substring(index).Trim();
if (!Enum.TryParse(unit, ignoreCase: true, out _unit))
{
_unit = unit switch
{
"%" => CssSizeLengthUnit.Percent,
_ => throw new FormatException(),
};
}
}
private CssSizeLength(int value, CssSizeLengthUnit unit)
{
_value = value;
_stringValue = null;
_unit = unit;
}
