Package new3;

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? {-> New grammar.notvide(P.tar.tar, P.tar.pid, P.tar.psemicolon)};

  tar {-> P.tar pid psemicolon} = T.tar id semicolon {-> New tar(T.tar)
                                                         New pid(id)
                                                         New psemicolon(semicolon)};

Abstract Syntax Tree

  grammar = {notvide} P.tar pid psemicolon |
            {vide} ;

  tar = T.tar;

  pid = id;

  psemicolon = semicolon;