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fix(xlsx): emit calculatedColumnFormula when table column has uniform formula pattern

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Excel expects <x:tableColumn> to carry <x:calculatedColumnFormula> so
newly appended rows auto-fill. When Add builds a table over a range
where every data row in a column carries a formula with the same
relative shape (e.g. =J2*K2, =J3*K3 …), stamp the first formula onto
the tableColumn. Detection uses a naive strip-digits heuristic — it
matches how users actually author calc'd columns without trying to
reimplement Excel's relative-reference normalizer.
This commit is contained in:
zmworm 2026-04-19 08:40:43 +08:00
parent 41e28e3f36
commit 600cc6fc30
1 changed files with 44 additions and 0 deletions
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44
src/officecli/Handlers/Excel/ExcelHandler.Add.cs
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@ -2475,6 +2475,50 @@ public partial class ExcelHandler
tableColumns.AppendChild(new TableColumn { Id = (uint)(i + 1), Name = colNames[i] });
table.AppendChild(tableColumns);
// T-ext: detect uniform formula pattern per column and emit
// <x:calculatedColumnFormula> so Excel auto-fills the formula
// into new rows appended to the table. Heuristic: if every data
// row in a column carries a CellFormula whose relative form
// (row numbers stripped) is identical, treat it as a calc'd
// column and store the first row's formula.
{
var ccfSheetData = GetSheet(tblWorksheet).GetFirstChild<SheetData>();
var dataStart = hasHeader ? startRow + 1 : startRow;
var dataEnd = hasTotalRow ? endRow - 1 : endRow;
if (ccfSheetData != null && dataEnd >= dataStart)
{
var tblColElems = tableColumns.Elements<TableColumn>().ToList();
for (int ci = 0; ci < colCount; ci++)
{
var colLetter = IndexToColumnName(startColIdx + ci);
string? firstFormula = null;
string? pattern = null;
bool uniform = true;
for (int r = dataStart; r <= dataEnd; r++)
{
var row = ccfSheetData.Elements<Row>()
.FirstOrDefault(rr => rr.RowIndex?.Value == (uint)r);
if (row == null) { uniform = false; break; }
var cellRefS = $"{colLetter}{r}";
var c = row.Elements<Cell>()
.FirstOrDefault(x => x.CellReference?.Value == cellRefS);
var f = c?.CellFormula?.Text;
if (string.IsNullOrEmpty(f)) { uniform = false; break; }
// Strip row numbers so =J2*K2 and =J3*K3 collapse to =J*K
var relF = System.Text.RegularExpressions.Regex.Replace(
f, @"\$?\d+", "");
if (pattern == null) { pattern = relF; firstFormula = f; }
else if (relF != pattern) { uniform = false; break; }
}
if (uniform && firstFormula != null)
{
tblColElems[ci].CalculatedColumnFormula =
new CalculatedColumnFormula(firstFormula);
}
}
}
}
// T7-ext: `columns.N.dxfId=<id>` stamps dataDxfId on the
// target tableColumn (N is 1-based). The id must reference
// an existing workbook differentialFormats entry; we do not