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                                                                                                                                                                                     # A TokenStream is a list of tokens, gathered during the parse
# of some entity (say a method). Entities populate these streams
# by being registered with the lexer. Any class can collect tokens
# by including TokenStream. From the outside, you use such an object
# by calling the start_collecting_tokens method, followed by calls
# to add_token and pop_token

module TokenStream
  def token_stream
    @token_stream
  end

  def start_collecting_tokens
    @token_stream = []
  end
  def add_token(tk)
    @token_stream << tk
  end
  def add_tokens(tks)
    tks.each  {|tk| add_token(tk)}
  end
  def pop_token
    @token_stream.pop
  end
end