internal ReadOnlyCharSegment Append(ReadOnlyMemory <char> allocation, int bytesUsed)
{
var ret =
new ReadOnlyCharSegment(allocation, bytesUsed)
{
RunningIndex = RunningIndex + Memory.Length
};
Next = ret;
return(ret);
}
internal bool MakeSequence(ref ReadOnlySequence <char> nonEmpty)
{
AssertNotDisposedInternal(this);
// nothing written
if (!HasNodes || Head.BytesUsed == 0)
{
return(false);
}
// single segment case
if (IsSingleSegment)
{
var usedPartOfHead = Head.Allocation.Slice(0, Head.BytesUsed);
nonEmpty = new ReadOnlySequence <char>(usedPartOfHead);
return(true);
}
// multi segment series
// we need this mapping because the
// Node representation isn't "finished"
// and still has extra space floating around
// between each node
var headSeg = new ReadOnlyCharSegment(Head.Allocation, Head.BytesUsed);
var tailSeg = headSeg;
if (Head.HasNext)
{
var n = Head.Next;
while (true)
{
tailSeg = tailSeg.Append(n.Allocation, n.BytesUsed);
if (n.HasNext)
{
n = n.Next;
}
else
{
break;
}
}
}
var startIx = 0;
var endIx = Tail.BytesUsed;
nonEmpty = new ReadOnlySequence <char>(headSeg, startIx, tailSeg, endIx);
return(true);
}