void InsertInternal(int offset, string text)
{
LineSegment segment = lineCollection.GetByOffset(offset);
DelimiterSegment ds = NextDelimiter(text, 0);
if (ds == null)
{
// no newline is being inserted, all text is inserted in a single line
segment.InsertedLinePart(offset - segment.Offset, text.Length);
SetSegmentLength(segment, segment.TotalLength + text.Length);
return;
}
LineSegment firstLine = segment;
firstLine.InsertedLinePart(offset - firstLine.Offset, ds.Offset);
int lastDelimiterEnd = 0;
while (ds != null)
{
// split line segment at line delimiter
int lineBreakOffset = offset + ds.Offset + ds.Length;
int segmentOffset = segment.Offset;
int lengthAfterInsertionPos = segmentOffset + segment.TotalLength - (offset + lastDelimiterEnd);
lineCollection.SetSegmentLength(segment, lineBreakOffset - segmentOffset);
LineSegment newSegment = lineCollection.InsertSegmentAfter(segment, lengthAfterInsertionPos);
segment.DelimiterLength = ds.Length;
segment = newSegment;
lastDelimiterEnd = ds.Offset + ds.Length;
ds = NextDelimiter(text, lastDelimiterEnd);
}
firstLine.SplitTo(segment);
// insert rest after last delimiter
if (lastDelimiterEnd != text.Length)
{
segment.InsertedLinePart(0, text.Length - lastDelimiterEnd);
SetSegmentLength(segment, segment.TotalLength + text.Length - lastDelimiterEnd);
}
}
