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XLS import: read the iterative calculation settings (part of #724)

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CalcIter, CalcCount and CalcDelta repeat in every worksheet substream and were skipped, so a workbook saved with iterative calculation on opened with it off and its circular references showed #CIRC!. They now set wb.calc from the first worksheet, as <calcPr iterate iterateCount iterateDelta> does for .xlsx.
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Marco Arnulfo
2026-10-12 18:43:28 +02:00
parent fc45b7f6d8
commit dbfed89a36
3 changed files with 38 additions and 9 deletions
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docs/file-format-parity.md
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@@ -1,6 +1,6 @@
# File-format parity
> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-12 · **Change:** minor (CSV save keeps the separator it was opened with) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-12 · **Change:** minor (`.xls` import reads the iterative calculation settings) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
Every format Excel opens or saves, with GridCraft's read and write support, fidelity and tests.
Part of [target-app-parity.md](target-app-parity.md). **File formats: ~50% ready, 80–120 h**
@@ -22,7 +22,7 @@ support comes from `crates/engine/src/io.rs` (`FileKind`), `crates/xlsx/src` and
| `.xlsm` Macro-Enabled Workbook | R/W | yes | yes, macros kept, not run | The VBA project is kept byte-for-byte and written back only into `.xlsm`/`.xltm` (#6); macros never run. Saved with the macro-enabled workbook content type | `roundtrip.rs` (`vba_project_roundtrip`, `package_kind_sets_workbook_content_type`), engine `io.rs` (`macros_are_saved_only_into_xlsm`) |
| `.xltx` / `.xltm` templates | R/W | yes | partial | Saved with the template (and macro-enabled template) content type, chosen by extension; `.xltm` keeps a VBA project, `.xltx` drops it; "new from template" behaviour missing | `roundtrip.rs` (`package_kind_sets_workbook_content_type`), engine `io.rs` |
| `.xlsb` Binary Workbook | R/W | **values only** (#101) | no | Names, visibility, numbers, text, booleans, errors, merges, cached formula results; no formulas, formatting, charts, names | `xlsb_tests.rs` |
| `.xls` Excel 97-2003 (BIFF8) | R/W | **yes, partial** (#121) | no (Save As `.xlsx`) | Clean-room from [MS-CFB] and [MS-XLS]. Read: worksheets and visibility, shared strings, numbers, text, booleans, errors, formulas (text for the common tokens, shared and array formulas, 3-D refs, names, newer functions called by name) with cached results, number formats (dates display as dates), 1904 date system, merges, column widths, row heights, defined names, print area and titles. Not read: fonts, fills, borders, alignment, charts, pictures, comments, CF, validation, hyperlinks, freeze panes, external links (formula kept as its value). Chart and macro sheets skipped with a warning; encrypted (FILEPASS) and BIFF5 (Excel 5.0/95) files refused with a message. Opens as a new unsaved workbook. Unverified on a real-world corpus | `xls_tests.rs` |
| `.xls` Excel 97-2003 (BIFF8) | R/W | **yes, partial** (#121) | no (Save As `.xlsx`) | Clean-room from [MS-CFB] and [MS-XLS]. Read: worksheets and visibility, shared strings, numbers, text, booleans, errors, formulas (text for the common tokens, shared and array formulas, 3-D refs, names, newer functions called by name) with cached results, number formats (dates display as dates), 1904 date system, merges, column widths, row heights, defined names, print area and titles, iterative calculation settings (enabled, maximum iterations, maximum change). Not read: fonts, fills, borders, alignment, charts, pictures, comments, CF, validation, hyperlinks, freeze panes, external links (formula kept as its value). Chart and macro sheets skipped with a warning; encrypted (FILEPASS) and BIFF5 (Excel 5.0/95) files refused with a message. Opens as a new unsaved workbook. Unverified on a real-world corpus | `xls_tests.rs` |
| `.xlt` Excel 97-2003 template | R/W | yes (read as `.xls`) | no | | — |
| `.xlam` / `.xla` add-ins | R/W | no | no | VBA; out of scope | — |
| `.xml` XML Spreadsheet 2003 | R/W | no | no | Simple to support | — |
@@ -78,6 +78,7 @@ refresh. Counted under features (Get & Transform, ~10% ready), not here.
| Date | Change | Summary |
|---|---|---|
| 2026-10-12 | minor | `.xls` import reads the iterative calculation settings (CalcIter, CalcCount, CalcDelta), so circular models calculate instead of showing `#CIRC!` (#724) |
| 2026-10-12 | minor | CSV: saving a file opened as CSV keeps its detected separator (`;` files were rewritten with `,`) |
| 2026-10-11 | minor | XLSX: cell/shared/array formulas read through the file→model conversion (`_xlpm.` LET/LAMBDA parameter prefixes stripped); table column names keep line breaks; table names may start with `\` |
| 2026-10-11 | minor | CSV/TSV export writes displayed values (number formats applied, no `#####`); `.xltx`, `.xltm` and `.xlsm` saved with their own workbook content types |