This commit contains 5 changes:

- Fix incorrect comment box size for multi-line plain text comments
- Prevent create duplicate tables with the same name
- Add new exported error variable `ErrExistsTableName`
- Allocate buffer inside escape XML characters
- Update the unit tests

cell.go

@@ -462,9 +462,9 @@ func trimCellValue(value string, escape bool) (v string, ns xml.Attr) {
 	if utf8.RuneCountInString(value) > TotalCellChars {
 		value = string([]rune(value)[:TotalCellChars])
 	}
-	buf := &bytes.Buffer{}
 	if escape {
-		_ = xml.EscapeText(buf, []byte(value))
+		var buf bytes.Buffer
+		_ = xml.EscapeText(&buf, []byte(value))
 		value = buf.String()
 	}
 	if len(value) > 0 {

comment.go

@@ -126,6 +126,9 @@ func (f *File) AddComment(sheet string, comment Comment) error {
 			}
 		}
 	}
+	if len(comment.Runs) == 0 {
+		rows, cols = 1, len(comment.Text)
+	}
 	if err = f.addDrawingVML(commentID, drawingVML, comment.Cell, rows+1, cols); err != nil {
 		return err
 	}

errors.go

@@ -239,6 +239,8 @@ var (
 	// ErrTableNameLength defined the error message on receiving the table name
 	// length exceeds the limit.
 	ErrTableNameLength = fmt.Errorf("the table name length exceeds the %d characters limit", MaxFieldLength)
+	// ErrExistsTableName defined the error message on given table already exists.
+	ErrExistsTableName = errors.New("the same name table already exists")
 	// ErrCellStyles defined the error message on cell styles exceeds the limit.
 	ErrCellStyles = fmt.Errorf("the cell styles exceeds the %d limit", MaxCellStyles)
 	// ErrUnprotectWorkbook defined the error message on workbook has set no

excelize_test.go

@@ -773,7 +773,7 @@ func TestSetCellStyleNumberFormat(t *testing.T) {
 			}
 			assert.NoError(t, f.SetCellStyle("Sheet2", c, c, style))
 			cellValue, err := f.GetCellValue("Sheet2", c)
-			assert.Equal(t, expected[i][k], cellValue, "Sheet2!"+c, i, k)
+			assert.Equal(t, expected[i][k], cellValue, fmt.Sprintf("Sheet2!%s value: %s, number format: %d", c, value[i], k))
 			assert.NoError(t, err)
 		}
 	}

table.go

@@ -12,8 +12,10 @@
 package excelize
 
 import (
+	"bytes"
 	"encoding/xml"
 	"fmt"
+	"io"
 	"regexp"
 	"strconv"
 	"strings"
@@ -75,6 +77,23 @@ func (f *File) AddTable(sheet string, table *Table) error {
 	if err != nil {
 		return err
 	}
+	var exist bool
+	f.Pkg.Range(func(k, v interface{}) bool {
+		if strings.Contains(k.(string), "xl/tables/table") {
+			var t xlsxTable
+			if err := f.xmlNewDecoder(bytes.NewReader(namespaceStrictToTransitional(v.([]byte)))).
+				Decode(&t); err != nil && err != io.EOF {
+				return true
+			}
+			if exist = t.Name == options.Name; exist {
+				return false
+			}
+		}
+		return true
+	})
+	if exist {
+		return ErrExistsTableName
+	}
 	// Coordinate conversion, convert C1:B3 to 2,0,1,2.
 	coordinates, err := rangeRefToCoordinates(options.Range)
 	if err != nil {

table_test.go

@@ -28,6 +28,8 @@ func TestAddTable(t *testing.T) {
 	}))
 	assert.NoError(t, f.AddTable("Sheet2", &Table{Range: "F1:F1", StyleName: "TableStyleMedium8"}))
 
+	// Test add table with already exist table name
+	assert.Equal(t, f.AddTable("Sheet2", &Table{Name: "Table1"}), ErrExistsTableName)
 	// Test add table with invalid table options
 	assert.Equal(t, f.AddTable("Sheet1", nil), ErrParameterInvalid)
 	// Test add table in not exist worksheet
@@ -63,6 +65,10 @@ func TestAddTable(t *testing.T) {
 			Name:  cases.name,
 		}), cases.err.Error())
 	}
+	// Test check duplicate table name with unsupported charset table parts
+	f = NewFile()
+	f.Pkg.Store("xl/tables/table1.xml", MacintoshCyrillicCharset)
+	assert.NoError(t, f.AddTable("Sheet1", &Table{Range: "A1:B2"}))
 }
 
 func TestSetTableHeader(t *testing.T) {