anchor.diff:  Comment = #.*
   
   Rules.
  -
  -%% Indentation
  -\n\s+ : build_indentation(TokenLine, TokenLen).
   
   %% Numbers
   -?{Digit}+\.{Digit}+ : build_float(TokenChars, TokenLine).
  
positive.code: reserved_word('def')     -> true;
  reserved_word('fun')     -> true;
  reserved_word('do')      -> true;
  reserved_word('case')    -> true;
  reserved_word('receive') -> true;
  reserved_word('after')   -> true;
  
negative.code: !     : {token,{'!',TokenLine}}.
  
  Erlang code.  
  
  build_integer([$-|Chars], Line) ->
    {token, {integer, Line, -list_to_integer(Chars)}};
  