lib/antelope/generation/recognizer/rule.rb in antelope-0.1.11 vs lib/antelope/generation/recognizer/rule.rb in antelope-0.2.0

@@ -17,11 +17,11 @@
         attr_reader :left
 
         # The right-hand side of the rule.
         #
         # @return [Array<Ace::Token>]
-        attr_accessor :right
+        attr_reader :right
 
         # The current position inside of the rule.
         #
         # @return [Numeric]
         attr_reader :position
@@ -158,10 +158,16 @@
           else
             super
           end
         end
 
+        def ==(other)
+          hash == other.hash if other.respond_to?(:hash)
+        end
+
+        alias_method :eql?, :==
+
         # Fuzzily compares this object to another object.  If the
         # other object is not a rule, it delegates the comparison.
         # Otherwise, it fuzzily compares the left and right sides.
         #
         # @param other [Object] the object to compare.
@@ -190,22 +196,20 @@
         # @note This is not intended for use.  It is only defined to be
         #   compatible with Hashs (and by extension, Sets).
         # @private
         # @return [Object]
         def hash
-          to_a.hash
+          @_hash ||= to_a.hash
         end
 
-        alias_method :eql?, :==
-
         # Creates an array representation of this class.
         #
         # @note This is not intended for use.  It is only defined to
         #   make equality checking easier, and to create a hash.
         # @private
         # @return [Array<(Ace::Token::Nonterminal, Array<Ace::Token>, Numeric)>]
         def to_a
-          [left, right, position]
+          @_array ||= [left, right, position]
         end
       end
     end
   end
 end