feat: add CalcFormulaValue method

calc.go

@@ -475,6 +475,27 @@ func (f *File) CalcCellValue(sheet, cell string) (result string, err error) {
 	return
 }
 
+func (f *File) CalcFormulaValue(sheet, formula string) (result string, err error) {
+	var (
+		token efp.Token
+	)
+	ps := efp.ExcelParser()
+	tokens := ps.Parse(formula)
+	if tokens == nil {
+		return
+	}
+	if token, err = f.evalInfixExp(sheet, "", tokens); err != nil {
+		return
+	}
+	result = token.TValue
+	isNum, precision := isNumeric(result)
+	if isNum && precision > 15 {
+		num, _ := roundPrecision(result)
+		result = strings.ToUpper(num)
+	}
+	return
+}
+
 // getPriority calculate arithmetic operator priority.
 func getPriority(token efp.Token) (pri int) {
 	pri = tokenPriority[token.TValue]