| 1 | package xlsx |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | "io" |
| 6 | "strings" |
| 7 | |
| 8 | "github.com/xuri/excelize/v2" |
| 9 | |
| 10 | "amadan.net/oficina/sheets/internal/sheets/calc" |
| 11 | "amadan.net/oficina/sheets/internal/sheets/store" |
| 12 | ) |
| 13 | |
| 14 | // Export writes h's tab out as an XLSX workbook with one worksheet. |
| 15 | // |
| 16 | // A formula cell is re-emitted as a formula (its exact original text, |
| 17 | // via Handle.RawInput), not flattened to its computed value — a person |
| 18 | // who imported a workbook and re-exported it unchanged must still be |
| 19 | // able to edit the formula, not just see a frozen number. No cached |
| 20 | // result is written alongside it (excelize.SetCellFormula does not carry |
| 21 | // one — verified directly against the library); Excel and LibreOffice |
| 22 | // both recalculate a formula that has no cached value on open, which is |
| 23 | // the same shape any programmatically generated formula file takes. |
| 24 | func Export(h *store.Handle, w io.Writer) error { |
| 25 | f := excelize.NewFile() |
| 26 | defer f.Close() |
| 27 | sheetName := f.GetSheetList()[0] |
| 28 | |
| 29 | rowPos := map[uint64]int{} |
| 30 | for _, r := range h.GridRows() { |
| 31 | rowPos[r.ID] = r.Pos |
| 32 | } |
| 33 | colPos := map[uint64]int{} |
| 34 | for _, c := range h.GridCols() { |
| 35 | colPos[c.ID] = c.Pos |
| 36 | } |
| 37 | |
| 38 | cells, err := h.Cells() |
| 39 | if err != nil { |
| 40 | return fmt.Errorf("xlsx: %w", err) |
| 41 | } |
| 42 | for _, cell := range cells { |
| 43 | rp, ok := rowPos[cell.RowID] |
| 44 | if !ok { |
| 45 | continue // defensive: every cell's row was loaded by the same Open |
| 46 | } |
| 47 | cp, ok := colPos[cell.ColID] |
| 48 | if !ok { |
| 49 | continue |
| 50 | } |
| 51 | if err := exportCell(f, sheetName, h, cell.RowID, cell.ColID, rp, cp); err != nil { |
| 52 | return err |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | // Layout, so a round trip does not quietly return every column to |
| 57 | // the default width — the same obligation Format.FillHex carries. |
| 58 | if err := exportSizes(f, sheetName, h); err != nil { |
| 59 | return fmt.Errorf("xlsx: %w", err) |
| 60 | } |
| 61 | |
| 62 | if err := f.Write(w); err != nil { |
| 63 | return fmt.Errorf("xlsx: write workbook: %w", err) |
| 64 | } |
| 65 | return nil |
| 66 | } |
| 67 | |
| 68 | // exportCell writes one cell's content (if any) and format (if any) at |
| 69 | // its spreadsheet position. |
| 70 | func exportCell(f *excelize.File, sheetName string, h *store.Handle, rowID, colID uint64, rowPos, colPos int) error { |
| 71 | cellRef, err := excelize.CoordinatesToCellName(colPos+1, rowPos+1) |
| 72 | if err != nil { |
| 73 | return fmt.Errorf("xlsx: cell %s: %w", calc.A1(rowPos, colPos), err) |
| 74 | } |
| 75 | |
| 76 | if raw, ok := h.RawInput(rowID, colID); ok && raw != "" { |
| 77 | if strings.HasPrefix(raw, "=") { |
| 78 | if err := f.SetCellFormula(sheetName, cellRef, raw[1:]); err != nil { |
| 79 | return fmt.Errorf("xlsx: write formula at %s: %w", calc.A1(rowPos, colPos), err) |
| 80 | } |
| 81 | } else if err := writeValue(f, sheetName, cellRef, h.Value(rowID, colID)); err != nil { |
| 82 | return fmt.Errorf("xlsx: write value at %s: %w", calc.A1(rowPos, colPos), err) |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | if format := h.Format(rowID, colID); format != nil { |
| 87 | if style, ok := styleFromFormat(format); ok { |
| 88 | styleID, err := f.NewStyle(&style) |
| 89 | if err != nil { |
| 90 | return fmt.Errorf("xlsx: build style at %s: %w", calc.A1(rowPos, colPos), err) |
| 91 | } |
| 92 | if err := f.SetCellStyle(sheetName, cellRef, cellRef, styleID); err != nil { |
| 93 | return fmt.Errorf("xlsx: apply style at %s: %w", calc.A1(rowPos, colPos), err) |
| 94 | } |
| 95 | } |
| 96 | } |
| 97 | return nil |
| 98 | } |
| 99 | |
| 100 | // writeValue writes a literal cell's already-computed value. Cell values |
| 101 | // are IEEE doubles end to end (spec §5): SetCellFloat's precision -1 |
| 102 | // means "the fewest digits that still round-trip exactly", the same |
| 103 | // contract calc.Render leans on for the same reason. |
| 104 | func writeValue(f *excelize.File, sheetName, cellRef string, v calc.Value) error { |
| 105 | switch v.Kind { |
| 106 | case calc.KindNum: |
| 107 | return f.SetCellFloat(sheetName, cellRef, v.Num, -1, 64) |
| 108 | case calc.KindStr: |
| 109 | return f.SetCellStr(sheetName, cellRef, v.Str) |
| 110 | case calc.KindBool: |
| 111 | return f.SetCellBool(sheetName, cellRef, v.Bool) |
| 112 | default: |
| 113 | // KindEmpty/KindErr never reach here for a literal (non-formula) |
| 114 | // cell: literalNode (store/handle_codec.go) never produces |
| 115 | // either from raw text. A formula cell's error result is |
| 116 | // preserved by re-emitting the formula above, not by writing a |
| 117 | // value at all. |
| 118 | return nil |
| 119 | } |
| 120 | } |
| 121 | |
amadan