public static StringSelection TryCreate(StringLocation start, int length)
{
if (!start.IsValid)
{
return(new StringSelection(start, -1));
}
var end = start.Skip(length);
if (!end.IsValid)
{
return(new StringSelection(start, -1));
}
return(new StringSelection(start, end));
}
public StringSelection(StringLocation start, int length)
{
if (start == null)
{
throw new ArgumentNullException("start");
}
_Start = start;
_Length = length;
_Text = null;
if (_Length < 0)
{
_End = null;
}
else
{
_End = start.Skip(length);
if (!_End.IsValid)
{
throw new Exception("String selection out of bounds");
}
}
}