Expr AndRule()
{
Expr expr = EqualityRule();
if (Match(AND_AND))
{
Token token = Previous();
Expr right = AndRule();
expr = new Logical(expr, token, right);
}
return(expr);
}
Expr OrRule()
{
Expr expr = AndRule();
if (Match(OR_OR))
{
Token token = Previous();
Expr right = OrRule();
expr = new Logical(expr, token, right);
}
return(expr);
}
public object Visit(Logical expr)
{
object left = Evaluate(expr.left);
if (expr.oper.type == OR_OR)
{
if (CheckIsTruthy(left))
{
return(left);
}
}
else
{
if (!CheckIsTruthy(left))
{
return(left);
}
}
return(Evaluate(expr.right));
}
public object Visit(Logical expr)
{
Resolve(expr.left);
Resolve(expr.right);
return(null);
}