Re: Boolean expression parser
Re: Boolean expression parser
- Subject: Re: Boolean expression parser
- From: Ken Anderson <email@hidden>
- Date: Tue, 5 Oct 2010 17:01:07 -0400
Why not use lex and yacc? or flex and bison?
It would be pretty easy to build a grammar that would work for this.
Ken
On Oct 5, 2010, at 4:21 PM, email@hidden wrote:
>
> I used JEP in another project years ago. Didn't have any issues with it and I recall it was simple to use.
>
> I see that it's rather pricey now - looking at the project, we were using vers. 2.2. Not sure what their pricing model was back then...
>
> Steve
>
> On Tue, 5 Oct 2010, Kieran Kelleher wrote:
>
>> Rather than reinvent the wheel, I am trying to find a real simple library or java class that will just do boolean expression only parsing and allow me to evaluate the value of the symbols to true or false (via callback or sth like that)
>>
>> For example and expression might look like this:
>>
>> "(canViewFood && canEatFood) || (canBuyFood && !canCookFood)"
>>
>> I want a lib or java class that will walk the expression, calling my method to evaluate whether each symbol (canViewFood, canEatFood, etc.) is true or false which logically would turn the expression into something like this:
>>
>> "(true && true) || (false && !true)"
>>
>>
>> and then evaluate the entire expression to be true or false.
>>
>> Possible candidates:
>> https://javacc.dev.java.net/
>> http://sourceforge.net/projects/jep/
>>
>> Anyone have experience with this kind of application requirement and would share opinions and/or experiences?
>>
>> Regards, Kieran
>>
>>
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