1 files changed, 21 insertions, 3 deletions
diff --git a/lib/roo/excelx/extractor.rb b/lib/roo/excelx/extractor.rb
index 1cdd13b..b87a84e 100644..100755
--- a/lib/roo/excelx/extractor.rb
+++ b/lib/roo/excelx/extractor.rb
@@ -1,16 +1,34 @@
+# frozen_string_literal: true
+
+require "roo/helpers/weak_instance_cache"
+
 module Roo
   class Excelx
     class Extractor
-      def initialize(path)
+      include Roo::Helpers::WeakInstanceCache
+
+      COMMON_STRINGS = {
+        t: "t",
+        r: "r",
+        s: "s",
+        ref: "ref",
+        html_tag_open: "<html>",
+        html_tag_closed: "</html>"
+      }
+
+      def initialize(path, options = {})
         @path = path
+        @options = options
       end
 
       private
 
       def doc
-        raise FileNotFound, "#{@path} file not found" unless doc_exists?
+        instance_cache(:@doc) do
+          raise FileNotFound, "#{@path} file not found" unless doc_exists?
 
-        ::Roo::Utils.load_xml(@path).remove_namespaces!
+          ::Roo::Utils.load_xml(@path).remove_namespaces!
+        end
       end
 
       def doc_exists?