module RDoc::Parser::RubyTools

def add_token_listener(obj)
  @token_listeners ||= []
  @token_listeners << obj
end

def get_tk
  tk = nil
  if @tokens.empty? then
    tk = @scanner.token
    @read.push @scanner.get_readed
    puts "get_tk1 => #{tk.inspect}" if $TOKEN_DEBUG
  else
    @read.push @unget_read.shift
    tk = @tokens.shift
    puts "get_tk2 => #{tk.inspect}" if $TOKEN_DEBUG
  end
  tk = nil if TkEND_OF_SCRIPT === tk
  if TkSYMBEG === tk then
    set_token_position tk.line_no, tk.char_no
    case tk1 = get_tk
    when TkId, TkOp, TkSTRING, TkDSTRING, TkSTAR, TkAMPER then
      if tk1.respond_to?(:name) then
        tk = Token(TkSYMBOL).set_text(":" + tk1.name)
      else
        tk = Token(TkSYMBOL).set_text(":" + tk1.text)
      end
      # remove the identifier we just read (we're about to replace it with a
      # symbol)
      @token_listeners.each do |obj|
        obj.pop_token
      end if @token_listeners
    else
      warn("':' not followed by identifier or operator")
      tk = tk1
    end
  end
  # inform any listeners of our shiny new token
  @token_listeners.each do |obj|
    obj.add_token(tk)
  end if @token_listeners
  tk
end

def get_tk_until(*tokens)
  read = []
  loop do
    tk = get_tk
    case tk when *tokens then unget_tk tk; break end
    read << tk
  end
  read
end

def get_tkread
  read = @read.join("")
  @read = []
  read
end

def peek_read
  @read.join('')
end

def peek_tk
  unget_tk(tk = get_tk)
  tk
end

def remove_token_listener(obj)
  @token_listeners.delete(obj)
end

def reset
  @read       = []
  @tokens     = []
  @unget_read = []
  @nest = 0
end

def skip_tkspace(skip_nl = true) # HACK dup
  tokens = []
  while TkSPACE === (tk = get_tk) or (skip_nl and TkNL === tk) do
    tokens.push tk
  end
  unget_tk tk
  tokens
end

def token_listener(obj)
  add_token_listener obj
  yield
ensure
  remove_token_listener obj
end

def unget_tk(tk)
  @tokens.unshift tk
  @unget_read.unshift @read.pop
  # Remove this token from any listeners
  @token_listeners.each do |obj|
    obj.pop_token
  end if @token_listeners
end