rebuild all serialization to use string concatenation instead of nokogiri.

1 files changed, 9 insertions, 3 deletions

diff --git a/lib/axlsx/stylesheet/cell_protection.rb b/lib/axlsx/stylesheet/cell_protection.rb
index 89d85289..b874b214 100644
--- a/lib/axlsx/stylesheet/cell_protection.rb
+++ b/lib/axlsx/stylesheet/cell_protection.rb
@@ -4,7 +4,7 @@ module Axlsx
   # @note Using Styles#add_style is the recommended way to manage cell protection.
   # @see Styles#add_style
   class CellProtection
-    
+
     # specifies locking for cells that have the style containing this protection
     # @return [Boolean]
     attr_reader :hidden
@@ -23,9 +23,15 @@ module Axlsx
     end
 
     # @see hidden
-    def hidden=(v) Axlsx::validate_boolean v; @hidden = v end    
+    def hidden=(v) Axlsx::validate_boolean v; @hidden = v end
     # @see locked
-    def locked=(v) Axlsx::validate_boolean v; @locked = v end    
+    def locked=(v) Axlsx::validate_boolean v; @locked = v end
+
+    def to_xml_string(str = '')
+      str << '<protection '
+      str << instance_values.map { |key, value| '' << key.to_s << '="' << value.to_s << '"' }.join(' ')
+      str << '/>'
+    end
 
     # Serializes the cell protection
     # @param [Nokogiri::XML::Builder] xml The document builder instance this objects xml will be added to.