Package listnewid2;

Helpers

tab = 9;
cr = 13;
lf = 10;
eol = [[cr + lf] + [cr + lf]];
white = [[' ' + tab] + eol];

lowercase = ['a' .. 'z'];
uppercase = ['A' .. 'Z'];
letter = [uppercase + lowercase];
digit = ['0'..'9'];
id_part = lowercase (lowercase | digit)*;
blank = (' ' | tab | eol)+;

Tokens

  tar = 'tar';
  id = id_part ('_' id_part)*;
  minus = '-';
  semicolon = ';';
  letter = letter;

  l_bkt = '[';
  r_bkt = ']';

  blank = blank;

Ignored Tokens

/* These tokens are simply ignored by the parser. */

    blank;

/*****************/
Productions
  grammar = P.tar semicolon {-> P.tar.first};

  tar {-> [first]:grammar grammar*} =
        {first} T.tar [previous]:id minus+ [first]:id letter  id*
      {-> Null [ New grammar.first(previous) New grammar.second(letter) ] };


Abstract Syntax Tree

  grammar         = {first} id |
                  {second} letter;