Package new1;

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 {-> New grammar(New first(New second(
                                    New third([P.tar.letter], [P.tar.id]))))};

  tar {-> letter* id* } = T.tar minus letter* id* {-> [letter] [id] };


Abstract Syntax Tree

  grammar         = first ;

  first                = second ;

  second        = third ;

  third                = letter* id* ;