public static ExcelSheetDiff Diff(ExcelSheet src, ExcelSheet dst, ExcelSheetDiffConfig config)
{
var srcColumns = src.CreateColumns();
var dstColumns = dst.CreateColumns();
var columnStatusMap = CreateColumnStatusMap(srcColumns, dstColumns, config);
var option = new DiffOption <ExcelRow>();
option.EqualityComparer =
new RowComparer(new HashSet <int>(columnStatusMap.Where(i => i.Value != ExcelColumnStatus.None).Select(i => i.Key)));
foreach (var row in src.Rows.Values)
{
var shifted = new List <ExcelCell>();
var index = 0;
var queue = new Queue <ExcelCell>(row.Cells);
while (queue.Any())
{
if (columnStatusMap[index] == ExcelColumnStatus.Inserted)
{
shifted.Add(new ExcelCell(string.Empty, 0, 0));
}
else
{
shifted.Add(queue.Dequeue());
}
index++;
}
row.UpdateCells(shifted);
}
foreach (var row in dst.Rows.Values)
{
var shifted = new List <ExcelCell>();
var index = 0;
var queue = new Queue <ExcelCell>(row.Cells);
while (queue.Any())
{
if (columnStatusMap[index] == ExcelColumnStatus.Deleted)
{
shifted.Add(new ExcelCell(string.Empty, 0, 0));
}
else
{
shifted.Add(queue.Dequeue());
}
index++;
}
row.UpdateCells(shifted);
}
var r = DiffUtil.Diff(src.Rows.Values, dst.Rows.Values, option);
r = DiffUtil.Order(r, DiffOrderType.LazyDeleteFirst);
var resultArray = DiffUtil.OptimizeCaseDeletedFirst(r).ToArray();
if (resultArray.Length > 10000)
{
var count = 0;
var indices = Enumerable.Range(0, 100).ToList();
foreach (var result in resultArray)
{
if (result.Status != DiffStatus.Equal)
{
indices.AddRange(Enumerable.Range(Math.Max(0, count - 100), 200));
}
count++;
}
indices = indices.Distinct().ToList();
resultArray = indices.Where(i => i < resultArray.Length).Select(i => resultArray[i]).ToArray();
}
var sheetDiff = new ExcelSheetDiff();
DiffCells(resultArray, sheetDiff, columnStatusMap);
return(sheetDiff);
}
private static Dictionary <int, ExcelColumnStatus> CreateColumnStatusMap(
IEnumerable <ExcelColumn> srcColumns, IEnumerable <ExcelColumn> dstColumns, ExcelSheetDiffConfig config)
{
var option = new DiffOption <ExcelColumn>();
if (config.SrcHeaderIndex >= 0)
{
option.EqualityComparer = new HeaderComparer();
foreach (var sc in srcColumns)
{
sc.HeaderIndex = config.SrcHeaderIndex;
}
}
if (config.DstHeaderIndex >= 0)
{
foreach (var dc in dstColumns)
{
dc.HeaderIndex = config.DstHeaderIndex;
}
}
var results = DiffUtil.Diff(srcColumns, dstColumns, option);
results = DiffUtil.Order(results, DiffOrderType.LazyDeleteFirst);
results = DiffUtil.OptimizeCaseDeletedFirst(results);
var ret = new Dictionary <int, ExcelColumnStatus>();
var columnIndex = 0;
foreach (var result in results)
{
var status = ExcelColumnStatus.None;
if (result.Status == DiffStatus.Deleted)
{
status = ExcelColumnStatus.Deleted;
}
else if (result.Status == DiffStatus.Inserted)
{
status = ExcelColumnStatus.Inserted;
}
ret.Add(columnIndex, status);
columnIndex++;
}
return(ret);
}