private TextLine FindLine(int absoluteIndex)
{
TextLine selected = null;
if (_currentLine != null)
{
if (_currentLine.Contains(absoluteIndex))
{
// This index is on the last read line
selected = _currentLine;
}
else if (absoluteIndex > _currentLine.Index && _currentLine.Index + 1 < _lines.Count)
{
// This index is ahead of the last read line
selected = ScanLines(absoluteIndex, _currentLine.Index);
}
}
// Have we found a line yet?
if (selected == null)
{
// Scan from line 0
selected = ScanLines(absoluteIndex, 0);
}
Debug.Assert(selected == null || selected.Contains(absoluteIndex));
_currentLine = selected;
return(selected);
}
private TextLine FindLine(int absoluteIndex)
{
TextLine selected = null;
if (_currentLine == null)
{
// Scan from line 0
selected = ScanLines(absoluteIndex, 0, _lines.Count);
}
else if (absoluteIndex >= _currentLine.End)
{
if (_currentLine.Index + 1 < _lines.Count)
{
// This index is after the last read line
var nextLine = _lines[_currentLine.Index + 1];
// Optimization to not search if it's the common case where the line after _currentLine is being requested.
if (nextLine.Contains(absoluteIndex))
{
selected = nextLine;
}
else
{
selected = ScanLines(absoluteIndex, _currentLine.Index, _lines.Count);
}
}
}
else if (absoluteIndex < _currentLine.Start)
{
if (_currentLine.Index > 0)
{
// This index is before the last read line
var prevLine = _lines[_currentLine.Index - 1];
// Optimization to not search if it's the common case where the line before _currentLine is being requested.
if (prevLine.Contains(absoluteIndex))
{
selected = prevLine;
}
else
{
selected = ScanLines(absoluteIndex, 0, _currentLine.Index);
}
}
}
else
{
// This index is on the last read line
selected = _currentLine;
}
Debug.Assert(selected == null || selected.Contains(absoluteIndex));
_currentLine = selected;
return(selected);
}