public override StringRebuilder Substring(Span span)
{
if (span.End > this.Length)
{
throw new ArgumentOutOfRangeException("span");
}
if (span.Length == this.Length)
{
return(this);
}
else if (span.End <= _left.Length)
{
return(_left.Substring(span));
}
else if (span.Start >= _left.Length)
{
return(_right.Substring(new Span(span.Start - _left.Length, span.Length)));
}
else
{
return(BinaryStringRebuilder.Create(_left.Substring(Span.FromBounds(span.Start, _left.Length)),
_right.Substring(Span.FromBounds(0, span.End - _left.Length))));
}
}
public static StringRebuilder Create(StringRebuilder left, StringRebuilder right)
{
if (left == null)
{
throw new ArgumentNullException("left");
}
if (right == null)
{
throw new ArgumentNullException("right");
}
if (left.Length == 0)
{
return(right);
}
else if (right.Length == 0)
{
return(left);
}
else if ((left.Length + right.Length < TextModelOptions.StringRebuilderMaxCharactersToConsolidate) &&
(left.LineBreakCount + right.LineBreakCount <= TextModelOptions.StringRebuilderMaxLinesToConsolidate))
{
//Consolidate the two rebuilders into a single simple string rebuilder
return(SimpleStringRebuilder.Create(left, right));
}
else if (right.StartsWithNewLine && left.EndsWithReturn)
{
//Don't allow a line break to be broken across the seam
return(BinaryStringRebuilder.Create(BinaryStringRebuilder.Create(left.Substring(new Span(0, left.Length - 1)),
_crlf),
right.Substring(Span.FromBounds(1, right.Length))));
}
else
{
return(BinaryStringRebuilder.BalanceStringRebuilder(left, right));
}
}