/// <summary>
/// Gets the "line" as defined by the Positions array. This assumes that the positions
/// mark the beginning of the "lines".
/// </summary>
/// <param name="index">The index in question in the input.</param>
/// <param name="lineNum">The 1-based line number in which the index is found.</param>
/// <param name="lineOffset">The offset of the index from the beginning of the line.</param>
/// <returns></returns>
public IEnumerable <TInput> GetLine(int index, out int lineNum, out int lineOffset)
{
if (sortedPositions == null || sortedPositions.Length != Positions.Count)
{
if (Positions.Count == 0 || !Positions.Contains(0))
{
Positions.Add(0);
}
sortedPositions = Positions.OrderBy(n => n).ToArray();
}
int start, next;
var srch = Array.BinarySearch(sortedPositions, index);
var srchOffset = sortedPositions[0] == 0 ? 1 : 2;
// we are on the the beginning of the line
if (srch >= 0)
{
start = sortedPositions[srch];
if (srch + 1 < sortedPositions.Length)
{
next = sortedPositions[srch + 1];
}
else
{
next = int.MaxValue;
}
lineNum = srch + srchOffset;
lineOffset = 0;
}
else
{
// srch is the index of the next largest position
srch = ~srch;
if (srch == 0)
{
start = 0;
next = sortedPositions[srch];
}
else if (srch < sortedPositions.Length)
{
start = sortedPositions[srch - 1];
next = sortedPositions[srch];
}
else
{
start = sortedPositions[sortedPositions.Length - 1];
next = int.MaxValue;
}
lineNum = srch + (srchOffset - 1);
lineOffset = index - start;
}
// get subsequence
if (InputString != null)
{
int li = start;
while (li < next && li < InputString.Length &&
InputString[li] != '\r' && InputString[li] != '\n')
{
++li;
}
return((IEnumerable <TInput>)(object) InputString.Substring(start, li - start));
}
else if (InputList != null)
{
next = Math.Min(InputList.Count, next - start);
return(InputList.Skip(start).Take(next - start));
}
else
{
return(InputEnumerable
.Skip(start)
.TakeWhile((item, i) => i + start < next));
}
}
private void UpdateDisplay()
{
CurrentDisplay = InputList.Skip((CurrentPage - 1) * ItemsPerPage).Take(ItemsPerPage).ToList();
}
