public Node BooleanTerm()
{
Node node = NotFactor();
while (CurrentToken().type == TokenType.AND)
{
MatchAndEat(TokenType.AND);
node = new BinOpNode(TokenType.AND, node, NotFactor());
}
return(node);
}
public static void main(string[] args)
{
NumberNode firstNumber = new NumberNode(100);
NumberNode secondNumber = new NumberNode(200);
Node sumNode = new BinOpNode(TokenType.ADD, firstNumber, secondNumber);
Console.WriteLine("100 + 200 = " + sumNode.Eval());
Node compareNode = new BinOpNode(TokenType.LESS, firstNumber, secondNumber);
Console.WriteLine("100 < 200 = " + compareNode.Eval());
}
public Node PreFactor()
{
Node node = Factor();
while (IsPowOp(CurrentToken().type))
{
switch (CurrentToken().type)
{
case TokenType.POWER:
node = new BinOpNode(TokenType.POWER, node, Power());
break;
}
}
return(node);
}
public Node BooleanExpression()
{
Node node = BooleanTerm();
while (IsLogicalOp(CurrentToken().type))
{
switch (CurrentToken().type)
{
case TokenType.OR:
MatchAndEat(TokenType.OR);
node = new BinOpNode(TokenType.OR, node, BooleanTerm());
break;
}
}
return(node);
}
public Node ArithmeticExpression()
{
Node node = Term();
while (IsAddOp(CurrentToken().type))
{
switch (CurrentToken().type)
{
case TokenType.ADD:
node = new BinOpNode(TokenType.ADD, node, Add());
break;
case TokenType.SUBTRACT:
node = new BinOpNode(TokenType.SUBTRACT, node, Subtract());
break;
}
}
return(node);
}
public Node Term()
{
Node node = SignedFactor();
while (IsMulOp(CurrentToken().type))
{
switch (CurrentToken().type)
{
case TokenType.MULTIPLY:
node = new BinOpNode(TokenType.MULTIPLY, node, Multiply());
break;
case TokenType.DIVIDE:
node = new BinOpNode(TokenType.DIVIDE, node, Divide());
break;
case TokenType.MOD:
node = new BinOpNode(TokenType.MOD, node, Mod());
break;
}
}
return(node);
}