lib/propane/parser/item.rb

@@ -72,15 +72,6 @@ class Propane
         end
       end
 
-      # Return whether the item is "complete", meaning that the parse position
-      # marker is at the end of the rule.
-      #
-      # @return [Boolean]
-      #   Whether the item is "complete".
-      def complete?
-        @position == @rule.components.size
-      end
-
       # Get the following symbol for the Item.
       #
       # That is, the symbol which follows the parse position marker in the

lib/propane/parser/item_set.rb

@@ -17,8 +17,8 @@ class Propane
       #   Maps a following symbol to its ItemSet.
       attr_reader :following_item_set
 
-      # @return [Set<ItemSet>]
-      #   ItemSets leading to this item set.
+      # @return [Set]
+      #   Item sets leading to this item set.
       attr_reader :in_sets
 
       # Build an ItemSet.
@@ -81,18 +81,6 @@ class Propane
         self == other
       end
 
-      # Set of ItemSets that lead to this ItemSet.
-      #
-      # This set includes this ItemSet.
-      #
-      # @return [Set<ItemSet>]
-      #   Set of all ItemSets that lead up to this ItemSet.
-      def leading_item_sets
-        @in_sets.reduce(Set[self]) do |result, item_set|
-          result + item_set.leading_item_sets
-        end
-      end
-
       # Represent the ItemSet as a String.
       #
       # @return [String]

lib/propane/rule.rb

@@ -42,16 +42,6 @@ class Propane
       @line_number = line_number
     end
 
-    # Return whether the Rule is empty.
-    #
-    # A Rule is empty if it has no components.
-    #
-    # @return [Boolean]
-    #   Whether the Rule is empty.
-    def empty?
-      @components.empty?
-    end
-
   end
 
 end

lib/propane/rule_set.rb

@@ -2,41 +2,17 @@ class Propane
 
   class RuleSet
 
-    # @return [String]
-    #   Name of the RuleSet.
     attr_reader :name
 
-    # @return [Array<Rule>]
-    #   Rules in the RuleSet.
     attr_reader :rules
 
-    # Construct a RuleSet.
-    #
-    # @param name [String]
-    #   Name of the RuleSet.
     def initialize(name)
       @name = name
       @rules = []
-      @could_be_empty = false
     end
 
-    # Add a Rule to the RuleSet.
-    #
-    # @param rule [Rule]
-    #   Rule to add.
     def <<(rule)
       @rules << rule
-      if rule.empty?
-        @could_be_empty = true
-      end
-    end
-
-    # Return whether any Rule in the RuleSet is empty.
-    #
-    # @return [Boolean]
-    #   Whether any rule in the RuleSet is empty.
-    def could_be_empty?
-      @could_be_empty
     end
 
   end