private Expr And()
{
var expr = Equality();
while (Match(TokenType.And))
{
var op = Previous();
var right = Equality();
expr = new LogicalExpr(expr, op, right);
}
return(expr);
}
private Expr Or()
{
var expr = And();
while (Match(TokenType.Or))
{
var op = Previous();
var right = And();
expr = new LogicalExpr(expr, op, right);
}
return(expr);
}
public object VisitLogicalExpr(LogicalExpr expr)
{
var left = Evaluate(expr.Left);
if (expr.Operator.Type == TokenType.Or)
{
if (IsTruthy(left))
{
return(left);
}
}
else
{
if (!IsTruthy(left))
{
return(left);
}
}
return(Evaluate(expr.Right));
}
public void VisitLogicalExpr(LogicalExpr expr)
{
Resolve(expr.Left);
Resolve(expr.Right);
}
public string VisitLogicalExpr(LogicalExpr expr)
{
throw new System.NotImplementedException();
}