Add builder pattern for paragraph, lists, tables

lib/ezdoc/document.rb

@@ -2,7 +2,9 @@
 
 module Ezdoc
   class Document
-    attr_reader :content
+    include Builder
+
+    attr_reader :nodes
 
     def self.create(path, &block)
       doc = new
@@ -12,15 +14,21 @@ module Ezdoc
     end
 
     def initialize
-      @content = []
-    end
-
-    def text(value)
-      @content << { text: value }
+      @nodes = []
+      @format_stack = []
+      @current_target = nil
+      @current_list = nil
+      @current_table = nil
+      @current_row = nil
+      @num_id_counter = 0
     end
 
     def save(path)
       Package.new(self).save(path)
     end
+
+    def lists
+      @nodes.select { |n| n.is_a?(Nodes::List) }
+    end
   end
 end