// Operator ::= + | - | * | / | < | > | =
Operate parseOperator()
{
if (CurrentToken == null)
{
return(null);
}
Operate O = new Operate(CurrentToken.getSpelling());
accept(Operator);
return(O);
}
// ============================================================================================================
// Expression ::= PrimaryExpression Operator PrimaryExpression
Expression parseExpression()
{
Expression expression;
if (CurrentToken == null)
{
return(null);
}
PrimaryExpression P1 = parsePrimary();
Operate O = parseOperator();
PrimaryExpression P2 = parsePrimary();
expression = new Expression(P1, O, P2);
return(expression);
}
public Expression(PrimaryExpression P1, Operate O, PrimaryExpression P2)
{
this.P1 = P1;
this.O = O;
this.P2 = P2;
}