# 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