looping on row col functionality

rows.go

+package excelize
+
+import (
+	"encoding/xml"
+	"strings"
+  "strconv"
+)
+
+
+// GetRows return all the rows in a sheet
+func (f *File) GetRows(sheet string) ([]xlsxRow, error) {
+	var xlsx xlsxWorksheet
+	name := `xl/worksheets/` + strings.ToLower(sheet) + `.xml`
+	err := xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
+	if ( err != nil ) {
+		return nil, err
+	}
+	rows := xlsx.SheetData.Row
+
+	return rows, nil
+
+}
+
+
+// readXMLSST read xmlSST simple function
+func readXMLSST(f *File) (xlsxSST, error) {
+	shardStrings := xlsxSST{}
+	err := xml.Unmarshal([]byte(f.readXML(`xl/sharedStrings.xml`)), &shardStrings)
+	return shardStrings, err
+}
+
+// GetValueFrom return a value from a column/row cell,
+// this function is inteded to be used with for range on rows
+// an argument with the xlsx opened file
+func (self* xlsxC) GetValueFrom(f *File) (string, error) {
+  switch self.T {
+    case "s":
+      xlsxSI := 0
+      xlsxSI, _ = strconv.Atoi(self.V)
+      d, err := readXMLSST(f)
+      if ( err != nil ) {
+        return "", err
+      }
+      return d.SI[xlsxSI].T, nil
+    case "str":
+      return self.V, nil
+    default:
+      return self.V, nil
+  } // switch
+}

sheet.go

@@ -185,6 +185,22 @@ func (f *File) SetActiveSheet(index int) {
 	return
 }
 
+
+
+func (f *File) GetColumnsLength(sheet string) (int, error) {
+	var xlsx xlsxWorksheet
+	name := `xl/worksheets/` + strings.ToLower(sheet) + `.xml`
+	err := xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
+	if ( err != nil ) {
+		return -1, err
+	}
+	rows := len(xlsx.SheetData.Row)
+
+	return rows, nil
+
+}
+
+
 // Replace xl/workbook.xml XML tags to self-closing for compatible Office Excel 2007.
 func workBookCompatibility(workbookMarshal string) string {
 	workbookMarshal = strings.Replace(workbookMarshal, `xmlns:relationships="http://schemas.openxmlformats.org/officeDocument/2006/relationships" relationships:id="`, `r:id="`, -1)