private Node ParseMultiplyDivide()
{
Node lhs = ParseUnary();
while (true)
{
Func <float, float, float> op = null;
if (this.tokenizer.currentToken == Tokenizer.Token.Multiply)
{
op = (a, b) => a * b;
}
else if (this.tokenizer.currentToken == Tokenizer.Token.Divide)
{
op = (a, b) => a / b;
}
if (op == null)
{
return(lhs);
}
this.tokenizer.NextToken();
Node rhs = this.ParseUnary();
lhs = new NodeBinary(lhs, rhs, op);
}
}
private Node ParseAddSubtract()
{
Node lhs = ParseMultiplyDivide();
while (true)
{
Func <float, float, float> op = null;
if (this.tokenizer.currentToken == Tokenizer.Token.Add)
{
op = (a, b) => a + b;
}
else if (this.tokenizer.currentToken == Tokenizer.Token.Subtract)
{
op = (a, b) => a - b;
}
if (op == null)
{
return(lhs);
}
this.tokenizer.NextToken();
Node rhs = ParseMultiplyDivide();
lhs = new NodeBinary(lhs, rhs, op);
}
}
