/* Calculator.jj calculadora simples para adição*/

options {
	STATIC = false;
}
PARSER_BEGIN(Calculator0)
import java.io.PrintStream;

	class Calculator0 {
		public static void main (String args[]) throws ParseException, TokenMgrError, NumberFormatException {
			Calculator0 parser = new Calculator0(System.in);
			parser.Start(System.out);
		}
		double previousValue = 0.0;
	}
PARSER_END(Calculator0)

SKIP: {" "}
TOKEN: {< EOL: "\n"|"\r"|"\r\n" > }
TOKEN: { < PLUS: "+" > }
TOKEN: { < NUMBER: <DIGITS>|<DIGITS>"."|<DIGITS>|<DIGITS>"."|"."<DIGITS> > }
TOKEN: { < #DIGITS: (["0"-"9"])+ > } //declaração de um token "local", por isso o '#'


void Start(PrintStream printStream) throws NumberFormatException :
{}
{
	(
		previousValue = Expression()
		<EOL>
		{ printStream.println(previousValue); }
	)*
	<EOF>

}

double Expression() throws NumberFormatException :
{
	double i;
	double value;
}
{

	value = Primary()
	(
		<PLUS>
		i = Primary()
		{value +=i; }
	)*
	{return value; }

}

double Primary() throws NumberFormatException :
{
	Token t;
}
{
	t = <NUMBER>
	{return Double.parseDouble( t.image );}
}