Remove TOKEN_EOF; define EOF token and start rule in Generator

lib/propane/token.rb

@@ -2,13 +2,25 @@ class Propane
 
   class Token
 
+    class << self
+
+      # Name of the token to use in code (special characters replaced).
+      #
+      # @return [String]
+      #   Name of the token to use in code (special characters replaced).
+      def code_name(name)
+        name.sub(/^\$/, "0")
+      end
+
+    end
+
     # @return [String, nil]
     #   Token name.
     attr_reader :name
 
     # @return [Integer, nil]
     #   Token ID.
-    attr_reader :id
+    attr_accessor :id
 
     # @return [Integer, nil]
     #   Line number where the token was defined in the input grammar.
@@ -20,14 +32,19 @@ class Propane
     #   Optional parameters.
     # @option options [String, nil] :name
     #   Token name.
-    # @option options [Integer, nil] :id
-    #   Token ID.
     # @option options [Integer, nil] :line_number
     #   Line number where the token was defined in the input grammar.
-    def initialize(options)
-      @name = options[:name]
-      @id = options[:id]
-      @line_number = options[:line_number]
+    def initialize(name, line_number)
+      @name = name
+      @line_number = line_number
+    end
+
+    # Name of the token to use in code (special characters replaced).
+    #
+    # @return [String]
+    #   Name of the token to use in code (special characters replaced).
+    def code_name
+      self.class.code_name(@name)
     end
 
     def to_s