/// <summary>
/// Sets the total line length and checks the delimiter.
/// This method can cause line to be deleted when it contains a single '\n' character
/// and the previous line ends with '\r'.
/// </summary>
/// <returns>Usually returns <paramref name="line"/>, but if line was deleted due to
/// the "\r\n" merge, returns the previous line.</returns>
DocumentLine SetLineLength(DocumentLine line, int newTotalLength)
{
// changedLines.Add(line);
// deletedOrChangedLines.Add(line);
int delta = newTotalLength - line.TotalLength;
if (delta != 0)
{
foreach (ILineTracker lt in lineTrackers)
{
lt.SetLineLength(line, newTotalLength);
}
line.TotalLength = newTotalLength;
DocumentLineTree.UpdateAfterChildrenChange(line);
}
// determine new DelimiterLength
if (newTotalLength == 0)
{
line.DelimiterLength = 0;
}
else
{
int lineOffset = line.Offset;
char lastChar = textBuffer.GetCharAt(lineOffset + newTotalLength - 1);
if (lastChar == '\r')
{
line.DelimiterLength = 1;
}
else if (lastChar == '\n')
{
if (newTotalLength >= 2 && textBuffer.GetCharAt(lineOffset + newTotalLength - 2) == '\r')
{
line.DelimiterLength = 2;
}
else if (newTotalLength == 1 && lineOffset > 0 && textBuffer.GetCharAt(lineOffset - 1) == '\r')
{
// we need to join this line with the previous line
DocumentLine previousLine = line.PreviousLine;
RemoveLine(line);
return(SetLineLength(previousLine, previousLine.TotalLength + 1));
}
else
{
line.DelimiterLength = 1;
}
}
else
{
line.DelimiterLength = 0;
}
}
return(line);
}
public char GetCharAt(int offset)
{
VerifyAccess();
if (offset < 0 || offset >= textBuffer.Length)
{
throw new ArgumentOutOfRangeException("offset", offset, "0 <= offset < " + textBuffer.Length.ToString());
}
return(textBuffer.GetCharAt(offset));
}