Boolean formula in string evaluation

Question

I'm storing a formula 1 && !0 && (0 || 1) in a NSString variable. I need to evaluate this string to a single boolean. Does anyone know of a built in obj-c object for handling this or a 3rd party solution?

Thanks in advance.

score 1 · Accepted Answer · answered Feb 06 '13 at 18:25

1

I think [NSPredicate parseWithFormat:] and [NSPredicate evaluateWithObject:] could help here.

answered Feb 06 '13 at 18:25

Johannes Weiss

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I had to reformat my formula string to this "1 == 1 AND NOT 0 == 1 AND ( 0 == 1 OR 1 == 1)" but this works. Thanks – Kyle Feb 06 '13 at 18:52

score 0 · Answer 2 · edited May 23 '17 at 11:48

Short of parsing it yourself, you won't be able to evaluate an expression like that in Objective-C during runtime since it is not an interpreted language.

Here are just a few (of many) other resources that pretty much echo this:

This post may get you a step closer to what you are trying to achieve. In any scenario, you will have to parse it yourself.

Boolean formula in string evaluation

2 Answers2