public void Visit(Opposition opposition)
{
stringBuilder.Append("(");
stringBuilder.Append("-");
opposition.Children[0].Accept(this);
stringBuilder.Append(")");
}
private static IExpression ReadPart()
{
IExpression node;
List <IExpression> children = new List <IExpression>();
switch (tokens[index])
{
case "+":
++index;
children.Add(ReadPart());
++index;
children.Add(ReadPart());
node = new Addition(children.ToArray());
return(node);
case "-":
++index;
children.Add(ReadPart());
++index;
children.Add(ReadPart());
node = new Subtraction(children.ToArray());
return(node);
case "*":
++index;
children.Add(ReadPart());
++index;
children.Add(ReadPart());
node = new Multiplication(children.ToArray());
return(node);
case "/":
++index;
children.Add(ReadPart());
++index;
children.Add(ReadPart());
node = new Division(children.ToArray());
return(node);
case "~":
++index;
children.Add(ReadPart());
node = new Opposition(children.ToArray());
return(node);
default:
int value = int.Parse(tokens[index]);
node = new Literal(value);
return(node);
}
}
public void Visit(Opposition opposition)
{
int temp = currentPriority;
if (temp > 3)
{
stringBuilder.Append("(");
}
currentPriority = 3;
stringBuilder.Append("-");
opposition.Children[0].Accept(this);
if (temp > 3)
{
stringBuilder.Append(")");
}
currentPriority = temp;
}
public void Visit(Opposition opposition)
{
opposition.Children[0].Accept(this);
MidValue = checked (-MidValue);
}