public void Visit(AdditionExpression ae)
{
sb.Append("(");
ae.Left.Accept(this);
sb.Append("+");
ae.Right.Accept(this);
sb.Append(")");
}
public void Visit(AdditionExpression ae)
{
ae.Left.Accept(this);
var a = Result;
ae.Right.Accept(this);
var b = Result;
Result = a + b;
}
public void ClassTest()
{
var e = new AdditionExpression(
new DoubleExpression(1),
new AdditionExpression(
new DoubleExpression(2),
new DoubleExpression(3)
)
);
//var sb = new StringBuilder();
var ep = new ExpressionPrinter();
ep.Visit(e);
Assert.AreEqual("(1+(2+3))", ep.ToString());
var calc = new ExpressionCalculator();
calc.Visit(e);
Assert.AreEqual(6, calc.Result);
}
static void main()
{
var e = new AdditionExpression(
new DoubleExpression(1),
new AdditionExpression(
new DoubleExpression(2),
new DoubleExpression(3)
)
);
//var sb = new StringBuilder();
var ep = new ExpressionPrinter();
ep.Visit(e);
WriteLine(ep);
var calc = new ExpressionCalculator();
calc.Visit(e);
WriteLine($"{ep} = {calc.Result}");
}