This related for #720 and closes #1965, add new NumFmt field in the PivotTableField data type

- Support set and get built-in number format of the pivot table data filed cells
- Update unit tests
- Fixed ineffectual assignment issue

calc.go

@@ -14459,7 +14459,7 @@ func (fn *formulaFuncs) VALUE(argsList *list.List) formulaArg {
 		value, _ := decimal.Float64()
 		return newNumberFormulaArg(value * percent)
 	}
-	dateValue, timeValue, errTime, errDate := 0.0, 0.0, false, false
+	dateValue, timeValue, errTime := 0.0, 0.0, false
 	if !isDateOnlyFmt(text) {
 		h, m, s, _, _, err := strToTime(text)
 		errTime = err.Type == ArgError
@@ -14468,7 +14468,7 @@ func (fn *formulaFuncs) VALUE(argsList *list.List) formulaArg {
 		}
 	}
 	y, m, d, _, err := strToDate(text)
-	errDate = err.Type == ArgError
+	errDate := err.Type == ArgError
 	if !errDate {
 		dateValue = daysBetween(excelMinTime1900.Unix(), makeDate(y, time.Month(m), d)) + 1
 	}

pivotTable.go

@@ -62,6 +62,10 @@ type PivotTableOptions struct {
 }
 
 // PivotTableField directly maps the field settings of the pivot table.
+//
+// Name specifies the name of the data field. Maximum 255 characters
+// are allowed in data field name, excess characters will be truncated.
+//
 // Subtotal specifies the aggregation function that applies to this data
 // field. The default value is sum. The possible values for this attribute
 // are:
@@ -78,8 +82,9 @@ type PivotTableOptions struct {
 //	Var
 //	Varp
 //
-// Name specifies the name of the data field. Maximum 255 characters
+// NumFmt specifies the number format ID of the data field, this filed only
-// are allowed in data field name, excess characters will be truncated.
+// accepts built-in number format ID and does not support custom number format
+// expression currently.
 type PivotTableField struct {
 	Compact         bool
 	Data            string
@@ -87,6 +92,7 @@ type PivotTableField struct {
 	Outline         bool
 	Subtotal        string
 	DefaultSubtotal bool
+	NumFmt          int
 }
 
 // AddPivotTable provides the method to add pivot table by given pivot table
@@ -452,6 +458,7 @@ func (f *File) addPivotDataFields(pt *xlsxPivotTableDefinition, opts *PivotTable
 	}
 	dataFieldsSubtotals := f.getPivotTableFieldsSubtotal(opts.Data)
 	dataFieldsName := f.getPivotTableFieldsName(opts.Data)
+	dataFieldsNumFmtID := f.getPivotTableFieldsNumFmtID(opts.Data)
 	for idx, dataField := range dataFieldsIndex {
 		if pt.DataFields == nil {
 			pt.DataFields = &xlsxDataFields{}
@@ -460,6 +467,7 @@ func (f *File) addPivotDataFields(pt *xlsxPivotTableDefinition, opts *PivotTable
 			Name:     dataFieldsName[idx],
 			Fld:      dataField,
 			Subtotal: dataFieldsSubtotals[idx],
+			NumFmtID: dataFieldsNumFmtID[idx],
 		})
 	}
 
@@ -687,6 +695,22 @@ func (f *File) getPivotTableFieldName(name string, fields []PivotTableField) str
 	return ""
 }
 
+// getPivotTableFieldsNumFmtID prepare fields number format ID by given pivot
+// table fields.
+func (f *File) getPivotTableFieldsNumFmtID(fields []PivotTableField) []int {
+	field := make([]int, len(fields))
+	for idx, fld := range fields {
+		if _, ok := builtInNumFmt[fld.NumFmt]; ok {
+			field[idx] = fld.NumFmt
+			continue
+		}
+		if (27 <= fld.NumFmt && fld.NumFmt <= 36) || (50 <= fld.NumFmt && fld.NumFmt <= 81) {
+			field[idx] = fld.NumFmt
+		}
+	}
+	return field
+}
+
 // getPivotTableFieldOptions return options for specific field by given field name.
 func (f *File) getPivotTableFieldOptions(name string, fields []PivotTableField) (options PivotTableField, ok bool) {
 	for _, field := range fields {
@@ -891,6 +915,7 @@ func (f *File) extractPivotTableFields(order []string, pt *xlsxPivotTableDefinit
 				Data:     order[field.Fld],
 				Name:     field.Name,
 				Subtotal: cases.Title(language.English).String(field.Subtotal),
+				NumFmt:   field.NumFmtID,
 			})
 		}
 	}

pivotTable_test.go

@@ -34,7 +34,7 @@ func TestPivotTable(t *testing.T) {
 		Rows:                []PivotTableField{{Data: "Month", DefaultSubtotal: true}, {Data: "Year"}},
 		Filter:              []PivotTableField{{Data: "Region"}},
 		Columns:             []PivotTableField{{Data: "Type", DefaultSubtotal: true}},
-		Data:                []PivotTableField{{Data: "Sales", Subtotal: "Sum", Name: "Summarize by Sum"}},
+		Data:                []PivotTableField{{Data: "Sales", Subtotal: "Sum", Name: "Summarize by Sum", NumFmt: 38}},
 		RowGrandTotals:      true,
 		ColGrandTotals:      true,
 		ShowDrill:           true,
@@ -131,7 +131,7 @@ func TestPivotTable(t *testing.T) {
 		PivotTableRange: "Sheet2!A1:AN17",
 		Rows:            []PivotTableField{{Data: "Month"}},
 		Columns:         []PivotTableField{{Data: "Region", DefaultSubtotal: true}, {Data: "Type", DefaultSubtotal: true}, {Data: "Year"}},
-		Data:            []PivotTableField{{Data: "Sales", Subtotal: "Min", Name: "Summarize by Min"}},
+		Data:            []PivotTableField{{Data: "Sales", Subtotal: "Min", Name: "Summarize by Min", NumFmt: 32}},
 		RowGrandTotals:  true,
 		ColGrandTotals:  true,
 		ShowDrill:       true,
@@ -151,7 +151,7 @@ func TestPivotTable(t *testing.T) {
 		PivotTableRange: "Sheet2!A20:AR60",
 		Rows:            []PivotTableField{{Data: "Month", DefaultSubtotal: true}, {Data: "Type"}},
 		Columns:         []PivotTableField{{Data: "Region", DefaultSubtotal: true}, {Data: "Year"}},
-		Data:            []PivotTableField{{Data: "Sales", Subtotal: "Product", Name: "Summarize by Product"}},
+		Data:            []PivotTableField{{Data: "Sales", Subtotal: "Product", Name: "Summarize by Product", NumFmt: 32}},
 		RowGrandTotals:  true,
 		ColGrandTotals:  true,
 		ShowDrill:       true,
@@ -171,7 +171,7 @@ func TestPivotTable(t *testing.T) {
 		PivotTableRange: "Sheet2!A65:AJ100",
 		Rows:            []PivotTableField{{Data: "Month", DefaultSubtotal: true}, {Data: "Year"}},
 		Columns:         []PivotTableField{{Data: "Region", DefaultSubtotal: true}, {Data: "Type"}},
-		Data:            []PivotTableField{{Data: "Sales", Subtotal: "Sum", Name: "Sum of Sales"}, {Data: "Sales", Subtotal: "Average", Name: "Average of Sales"}},
+		Data:            []PivotTableField{{Data: "Sales", Subtotal: "Sum", Name: "Sum of Sales", NumFmt: -1}, {Data: "Sales", Subtotal: "Average", Name: "Average of Sales", NumFmt: 38}},
 		RowGrandTotals:  true,
 		ColGrandTotals:  true,
 		ShowDrill:       true,

styles.go

@@ -1902,27 +1902,25 @@ func (f *File) newFont(style *Style) (*xlsxFont, error) {
 
 // getNumFmtID provides a function to get number format code ID.
 // If given number format code does not exist, will return -1.
-func getNumFmtID(styleSheet *xlsxStyleSheet, style *Style) (numFmtID int) {
+func getNumFmtID(styleSheet *xlsxStyleSheet, style *Style) int {
-	numFmtID = -1
+	numFmtID := -1
 	if _, ok := builtInNumFmt[style.NumFmt]; ok {
 		return style.NumFmt
 	}
 	if (27 <= style.NumFmt && style.NumFmt <= 36) || (50 <= style.NumFmt && style.NumFmt <= 81) {
-		numFmtID = style.NumFmt
+		return style.NumFmt
-		return
 	}
 	if fmtCode, ok := currencyNumFmt[style.NumFmt]; ok {
 		numFmtID = style.NumFmt
 		if styleSheet.NumFmts != nil {
 			for _, numFmt := range styleSheet.NumFmts.NumFmt {
 				if numFmt.FormatCode == fmtCode {
-					numFmtID = numFmt.NumFmtID
+					return numFmt.NumFmtID
-					return
 				}
 			}
 		}
 	}
-	return
+	return numFmtID
 }
 
 // newNumFmt provides a function to check if number format code in the range

xmlPivotTable.go

@@ -273,7 +273,7 @@ type xlsxDataField struct {
 	ShowDataAs string      `xml:"showDataAs,attr,omitempty"`
 	BaseField  int         `xml:"baseField,attr,omitempty"`
 	BaseItem   int64       `xml:"baseItem,attr,omitempty"`
-	NumFmtID   string      `xml:"numFmtId,attr,omitempty"`
+	NumFmtID   int         `xml:"numFmtId,attr,omitempty"`
 	ExtLst     *xlsxExtLst `xml:"extLst"`
 }