//
// mjava.grammar
// To build:
//      java -jar sablecc.jar mjava.grammar
//      javac Main.java
//

Helpers
   digit = ['0'..'9'];
   let   = ['a'..'z'] | ['A'..'Z'];
   space = ' ' | 9;
   newline = 10 | 11 | 12;
   carriage_return = 13;
   not_star = [0..41] | [43..127];
   not_slash = [0..46] | [48..127];
   not_slashstar = [0..41] | [43..46] | [48..127];
   not_newline = [0..9] | [11..127];

Tokens

   // TODO: add missing tokens - see the appendix for the different tokens

   boolean = 'boolean';
   class_token = 'class'; // must not be "class" - that conflicts with Java keywords
   else = 'else';
   extends = 'extends';
   false = 'false';
   if = 'if';
   int = 'int';
   length = 'length';
   main = 'main';
   new = 'new';
   println = 'System.out.println';

   lbracket = '[';
   rbracket = ']';
   semi = ';';
   equal = '=';
   dot = '.';
   bang = '!';
   comma = ',';
   plus = '+';
   and = '&&';
   less = '<';
   minus = '-';
   star = '*';

   // TODO: complete the following to define tokens for identifiers, numbers,
   //   whitespace, single-line comments starting with '//', and multi-line
   //   comments starting with /* and ending with */
   id = let;
   number = digit;
   whitespace = (carriage_return)*;
   line_comment = '//' newline ;
   slashstar_comment = '/*' ;

Ignored Tokens
   whitespace,
   line_comment,
   slashstar_comment;