Cache ItemSet#leading_item_sets return values - #28

2024-07-25 10:42:43 -04:00 · 2024-07-25 10:42:43 -04:00 · 588c5e21c7
commit 588c5e21c7
parent 5f1c306273
1 changed files with 16 additions and 13 deletions
--- a/lib/propane/parser/item_set.rb
+++ b/lib/propane/parser/item_set.rb
@ -99,6 +99,8 @@ class Propane
      # @return [Set<ItemSet>]
      #   Set of all ItemSets that lead up to this ItemSet.
      def leading_item_sets
+        @_leading_item_sets ||=
+          begin
            result = Set.new
            eval_sets = Set[self]
            evaled = Set.new
@ -115,6 +117,7 @@ class Propane
            end
            result
          end
+      end

      # Represent the ItemSet as a String.
      #