I am looking for an boolean and numeric expression evaluator. I want to be able to compare ( ,=, , or, not, and, nand, etc)and evaluate boolean/numeric expression.

I am looking for an boolean and numeric expression evaluator. I want to be able to compare (>,=, <, or, not, and, nand, etc)and evaluate boolean/numeric expression. Does anyone know if there is any code samples anywhere. If anyone has any input, I would greately appreciate it.

The problem is that I have to enter a string of that type (any random string), and the program should go and calculate the result for the whole stirng, by looking at which parts to calculate first (figuring out precedence), second, etc. This is like a calculator, you don't know what the user is going to enter next, so I can't just use the boolean palatte. I could use it if the equation was always of the form "a 'operator' b", where the operator is any logic or comparison operator. But that is not what I am trying to accomplish.
Can you do logic in the formula node? I think it only allows numeric values for inputs and outputs, it doesn't let you enter in and output booleans and stuff..does it?
Thanks,
Yuliya

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