/// <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>
private DocumentLine SetLineLength(DocumentLine line, int newTotalLength)
{
var delta = newTotalLength - line.TotalLength;
if (delta != 0)
{
foreach (var lt in _lineTrackers)
{
lt.SetLineLength(line, newTotalLength);
}
line.TotalLength = newTotalLength;
DocumentLineTree.UpdateAfterChildrenChange(line);
}
// determine new DelimiterLength
if (newTotalLength == 0)
{
line.DelimiterLength = 0;
}
else
{
var lineOffset = line.Offset;
var lastChar = _document.GetCharAt(lineOffset + newTotalLength - 1);
if (lastChar == '\r')
{
line.DelimiterLength = 1;
}
else if (lastChar == '\n')
{
if (newTotalLength >= 2 && _document.GetCharAt(lineOffset + newTotalLength - 2) == '\r')
{
line.DelimiterLength = 2;
}
else if (newTotalLength == 1 && lineOffset > 0 && _document.GetCharAt(lineOffset - 1) == '\r')
{
// we need to join this line with the previous line
var previousLine = line.PreviousLine;
RemoveLine(line);
return(SetLineLength(previousLine, previousLine.TotalLength + 1));
}
else
{
line.DelimiterLength = 1;
}
}
else
{
line.DelimiterLength = 0;
}
}
return(line);
}
public int FindMatchingBracketBackward(AvaloniaEdit.Document.TextDocument document, int startOffset, char close, char open)
{
var result = startOffset;
var currentChar = document.GetCharAt(startOffset--);
if (currentChar == close)
{
var numOpen = 0;
while (true)
{
if (startOffset < 0)
{
break;
}
currentChar = document.GetCharAt(startOffset--);
if (currentChar == open && numOpen == 0)
{
result = startOffset + 1;
break;
}
if (currentChar == close)
{
numOpen++;
}
else if (currentChar == open)
{
numOpen--;
}
if (startOffset >= document.TextLength)
{
break;
}
}
}
return(result);
}
public void GetCharAt0EmptyDocument()
{
Assert.Throws <ArgumentOutOfRangeException>(() => document.GetCharAt(0));
}