part way through changing all serialization to use string concatenation prior to dropping Nokogiri dep in production.

1 files changed, 18 insertions, 2 deletions

diff --git a/lib/axlsx/drawing/cat_axis_data.rb b/lib/axlsx/drawing/cat_axis_data.rb
index b9b57d01..a119282e 100644
--- a/lib/axlsx/drawing/cat_axis_data.rb
+++ b/lib/axlsx/drawing/cat_axis_data.rb
@@ -11,6 +11,22 @@ module Axlsx
       data.each { |i| @list << i } if data.is_a?(SimpleTypedList)
     end
 
+
+    def to_xml_string(str = '')
+      str << '<cat>'
+      str << '<strRef>'
+      str << '<f>' << Axlsx::cell_range(@list) << '</f>'
+      str << '<strCache>'
+      str << '<ptCount val="' << size.to_s << '"/>'
+      each_with_index do |item, index|
+        v = item.is_a?(Cell) ?  item.value.to_s : item
+        str << '<pt idx="' << index.to_s << '"><v>' << v << '</v></pt>'
+      end
+      str << '</strCache>'
+      str << '</strRef>'
+      str << '</cat>'
+    end
+
     # Serializes the category axis data
     # @param [Nokogiri::XML::Builder] xml The document builder instance this objects xml will be added to.
     # @return [String]
@@ -24,7 +40,7 @@ module Axlsx
               v = item.is_a?(Cell) ? item.value : item
               xml.pt(:idx=>index) {
                 xml.v v
-              }                          
+              }
             end
           }
         }
@@ -32,5 +48,5 @@ module Axlsx
     end
 
   end
-  
+
 end