grammar FOOL;

@header {
import ast.*;
}

@lexer::members {
int lexicalErrors=0;
}


/*------------------------------------------------------------------
 * PARSER RULES
 *------------------------------------------------------------------*/

prog returns [Node ast]: e=exp { $ast = new ProgNode($e.ast); } SEMIC EOF;

exp	returns [Node ast]: t=term { $ast = $t.ast; } (PLUS t2=term { $ast = new PlusNode($ast, $t2.ast); })* ;

term returns [Node ast]: f=factor { $ast = $f.ast; } (TIMES f2=factor { $ast = new TimesNode($ast, $f2.ast); })* ;

factor returns [Node ast]: v=value { $ast = $v.ast; } (EQ v2=value { $ast = new EqualNode($ast, $v2.ast); })* ;	 // EqualNode