options{DEBUG_PARSER = true; DEBUG_TOKEN_MANAGER = true;}

PARSER_BEGIN(Calculator)
public class Calculator {
	public static void main(String[] args) {
		try{
		    Calculator parser = new Calculator(System.in);
			parser.Start();
		}catch (ParseException e){
			System.out.println(e.getMessage());
		}
	}
}
PARSER_END(Calculator)

/**
* For now only using the Hello World grammar
*/

SKIP : {
    " "|"\t"|"\n"|"\r"
}

TOKEN : {
	<SPACE: " "|"\t">|
	<HELLO: "hello">|
	<WORLD: "world">|
	<HELLOWORLD: <HELLO> ( <SPACE> ) + <WORLD>>
}

void Start() : {
}
{
	(<HELLOWORLD>)* <EOF>
}