lib/asciidoctor-bibliography/bibliographer.rb in asciidoctor-bibliography-0.4.4 vs lib/asciidoctor-bibliography/bibliographer.rb in asciidoctor-bibliography-0.5.0

@@ -9,18 +9,21 @@
     def initialize
       @options = {}
       @citations = []
       @indices = []
       @database = nil
-      @occurring_keys = []
+      @occurring_keys = Hash.new([])
     end
 
     def add_citation(citation)
       citations << citation
-      @occurring_keys.concat(citation.citation_items.map(&:key)).uniq!
+      citation.citation_items.group_by(&:target).each do |target, citation_items|
+        @occurring_keys[target] ||= []
+        @occurring_keys[target].concat(citation_items.map(&:key)).uniq!
+      end
     end
 
-    def appearance_index_of(id)
-      @occurring_keys.index(id) + 1
+    def appearance_index_of(target, id)
+      @occurring_keys[target].index(id) + 1
     end
   end
 end