ref #65, new formula function: DBCS (#1791)

Co-authored-by: wujierui <wujierui@jimabrand.com>

Author: rememberher

calc.go

@@ -455,6 +455,7 @@ type formulaFuncs struct {
 //	DAYS
 //	DAYS360
 //	DB
+//	DBCS
 //	DCOUNT
 //	DCOUNTA
 //	DDB
@@ -13566,6 +13567,38 @@ func (fn *formulaFuncs) concat(name string, argsList *list.List) formulaArg {
 	return newStringFormulaArg(buf.String())
 }
 
+// DBCS converts half-width (single-byte) letters within a character string to
+// full-width (double-byte) characters. The syntax of the function is:
+//
+//	DBCS(text)
+func (fn *formulaFuncs) DBCS(argsList *list.List) formulaArg {
+	if argsList.Len() != 1 {
+		return newErrorFormulaArg(formulaErrorVALUE, "DBCS requires 1 argument")
+	}
+	arg := argsList.Front().Value.(formulaArg)
+	if arg.Type == ArgError {
+		return arg
+	}
+	if fn.f.options.CultureInfo == CultureNameZhCN {
+		var chars []string
+		for _, r := range arg.Value() {
+			code := r
+			if code == 32 {
+				code = 12288
+			} else {
+				code += 65248
+			}
+			if (code < 32 || code > 126) && r != 165 && code < 65381 {
+				chars = append(chars, string(code))
+			} else {
+				chars = append(chars, string(r))
+			}
+		}
+		return newStringFormulaArg(strings.Join(chars, ""))
+	}
+	return arg
+}
+
 // EXACT function tests if two supplied text strings or values are exactly
 // equal and if so, returns TRUE; Otherwise, the function returns FALSE. The
 // function is case-sensitive. The syntax of the function is:

calc_test.go

@@ -1723,6 +1723,10 @@ func TestCalcCellValue(t *testing.T) {
 		"=CONCATENATE(TRUE(),1,FALSE(),\"0\",INT(2))": "TRUE1FALSE02",
 		"=CONCATENATE(MUNIT(2))":                      "1001",
 		"=CONCATENATE(A1:B2)":                         "1425",
+		// DBCS
+		"=DBCS(\"\")":        "",
+		"=DBCS(123.456)":     "123.456",
+		"=DBCS(\"123.456\")": "123.456",
 		// EXACT
 		"=EXACT(1,\"1\")":     "TRUE",
 		"=EXACT(1,1)":         "TRUE",
@@ -3836,6 +3840,9 @@ func TestCalcCellValue(t *testing.T) {
 		// CONCATENATE
 		"=CONCATENATE(NA())":  {"#N/A", "#N/A"},
 		"=CONCATENATE(1,1/0)": {"#DIV/0!", "#DIV/0!"},
+		// DBCS
+		"=DBCS(NA())": {"#N/A", "#N/A"},
+		"=DBCS()":     {"#VALUE!", "DBCS requires 1 argument"},
 		// EXACT
 		"=EXACT()":      {"#VALUE!", "EXACT requires 2 arguments"},
 		"=EXACT(1,2,3)": {"#VALUE!", "EXACT requires 2 arguments"},
@@ -5194,6 +5201,14 @@ func TestCalcDatabase(t *testing.T) {
 	}
 }
 
+func TestCalcDBCS(t *testing.T) {
+	f := NewFile(Options{CultureInfo: CultureNameZhCN})
+	assert.NoError(t, f.SetCellFormula("Sheet1", "A1", "=DBCS(\"`~·!@#$¥%…^&*()_-+=[]{}\\|;:'\"\"<,>.?/01234567890 abc ABC \uff65\uff9e\uff9f \uff74\uff78\uff7e\uff99\")"))
+	result, err := f.CalcCellValue("Sheet1", "A1")
+	assert.NoError(t, err)
+	assert.Equal(t, "\uff40\uff5e\u00b7\uff01\uff20\uff03\uff04\u00a5\uff05\u2026\uff3e\uff06\uff0a\uff08\uff09\uff3f\uff0d\uff0b\uff1d\uff3b\uff3d\uff5b\uff5d\uff3c\uff5c\uff1b\uff1a\uff07\uff02\uff1c\uff0c\uff1e\uff0e\uff1f\uff0f\uff10\uff11\uff12\uff13\uff14\uff15\uff16\uff17\uff18\uff19\uff10\u3000\uff41\uff42\uff43\u3000\uff21\uff22\uff23\u3000\uff65\uff9e\uff9f\u3000\uff74\uff78\uff7e\uff99", result)
+}
+
 func TestCalcFORMULATEXT(t *testing.T) {
 	f, formulaText := NewFile(), "=SUM(B1:C1)"
 	assert.NoError(t, f.SetCellFormula("Sheet1", "A1", formulaText))