Additional validations for excel sheet name and example updates

2 files changed, 5 insertions, 0 deletions

diff --git a/lib/axlsx/util/constants.rb b/lib/axlsx/util/constants.rb
index 0a2b5499..e5fb08f1 100644
--- a/lib/axlsx/util/constants.rb
+++ b/lib/axlsx/util/constants.rb
@@ -249,6 +249,10 @@ module Axlsx
 
   # error message for sheets that use a name which is longer than 31 bytes
   ERR_SHEET_NAME_TOO_LONG = "Your worksheet name '%s' is too long. Worksheet names must be 31 characters (bytes) or less"
+  
+  # error message for sheets that use a name which includes a colon
+  
+  ERR_SHEET_NAME_COLON_FORBIDDEN = "Your worksheet name '%s' contains a colon, which is not allowed by MS Excel and will cause repair warnings. Please change the name of your sheet."
 
   # error message for duplicate sheet names
   ERR_DUPLICATE_SHEET_NAME = "There is already a worksheet in this workbook named '%s'. Please use a unique name"
diff --git a/lib/axlsx/workbook/worksheet/worksheet.rb b/lib/axlsx/workbook/worksheet/worksheet.rb
index 93eb010b..68ae2e03 100644
--- a/lib/axlsx/workbook/worksheet/worksheet.rb
+++ b/lib/axlsx/workbook/worksheet/worksheet.rb
@@ -322,6 +322,7 @@ module Axlsx
     def name=(v)
       DataTypeValidator.validate "Worksheet.name", String, v
       raise ArgumentError, (ERR_SHEET_NAME_TOO_LONG % v) if v.size > 31
+      raise ArgumentError, (ERR_SHEET_NAME_COLON_FORBIDDEN % v) if v.include? ':'
       v = Axlsx::coder.encode(v) 
       sheet_names = @workbook.worksheets.map { |s| s.name }
       raise ArgumentError, (ERR_DUPLICATE_SHEET_NAME % v) if sheet_names.include?(v)