Package newlist4;

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


  minus = '-';
  semicolon = ';';
  letter = letter;
  tar = 'tar';
  to = 'to';
  id = id_part ('_' id_part)*;
  l_bkt = '[';
  r_bkt = ']';
  digit = digit;


  blank = blank;
  comment = '//' letter*;

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

    blank,
    comment;

/*****************/
Productions
  grammar = P.tar {-> New grammar.first([P.tar.tar], [P.tar.first P.tar.id])};
  tar {-> T.tar* [first]:id id} = T.tar* minus* [first]:id letter*  id? {-> [T.tar] first id};


Abstract Syntax Tree

  grammar         = {first}  T.tar* id* | /*java.lang.RuntimeException: [46,23] ambiguous PTar and TTar.*/
                  {second} ;