Add Formula & Format support

example_test.go

@@ -2,6 +2,7 @@ package xls
 
 import (
 	"fmt"
+	"testing"
 )
 
 func ExampleOpen() {
@@ -35,3 +36,23 @@ func ExampleWorkBook_GetSheet() {
 		}
 	}
 }
+
+func BenchmarkGetSheet(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		if xlFile, err := Open("Table.xls", "utf-8"); err == nil {
+			for i := 0; i < xlFile.NumSheets(); i++ {
+				xlFile.GetSheet(i)
+			}
+		}
+	}
+}
+
+func BenchmarkGetSheetWithBuffer(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		if xlFile, err := OpenWithBuffer("Table.xls", "utf-8"); err == nil {
+			for i := 0; i < xlFile.NumSheets(); i++ {
+				xlFile.GetSheet(i)
+			}
+		}
+	}
+}