new (RParsec::Keywords)

    # File rparsec/keywords.rb, line 57
      def initialize(words, case_sensitive, default_lexer, keyword_symbol, &block)
        @default_lexer, @case_sensitive, @keyword_symbol = default_lexer, case_sensitive, keyword_symbol
        # this guarantees that we have copy of the words array and all the word strings.
        words = copy_words(words, case_sensitive)
        @name_map = {}
        @symbol_map = {}
        word_map = {}
        words.each do |w|
          symbol = "#{keyword_symbol}:#{w}".to_sym
          word_map[w] = symbol
          parser = Parsers.token(symbol, &block)
          @symbol_map["#{w}".to_sym] = parser
          @name_map[w] = parser
        end
        @lexer = make_lexer(default_lexer, word_map)
      end