speedup get cell value from shared string table

1 files changed, 2 insertions, 0 deletions

diff --git a/excelize.go b/excelize.go
index 3fd25aa..3e0255a 100644
--- a/excelize.go
+++ b/excelize.go
@@ -38,6 +38,7 @@ type File struct {
 	Drawings         map[string]*xlsxWsDr
 	Path             string
 	SharedStrings    *xlsxSST
+	sharedStringsMap map[string]int
 	Sheet            map[string]*xlsxWorksheet
 	SheetCount       int
 	Styles           *xlsxStyleSheet
@@ -75,6 +76,7 @@ func newFile() *File {
 		sheetMap:         make(map[string]string),
 		Comments:         make(map[string]*xlsxComments),
 		Drawings:         make(map[string]*xlsxWsDr),
+		sharedStringsMap: make(map[string]int),
 		Sheet:            make(map[string]*xlsxWorksheet),
 		DecodeVMLDrawing: make(map[string]*decodeVmlDrawing),
 		VMLDrawing:       make(map[string]*vmlDrawing),