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How to set up argument using "or" in prerequisites

B

Bob G

Well-known member
Hi everyone,

How would you set up a prerequisite that uses the argument "or"? i.e. "If the hero has the weapon finesse feat or the combat expertise feat, the argument is true."
 
In this specific case you can use a tagexpr[].

Example:
Code: 
hero.tagexpr[HasFeat.fWepFin | HasFeat.fComExp] <> 0

Check those tag ids I as don't remember them exactly but the example otherwise works.
 
Another thing you can do is combine tagis results and see what they add up to:

Code: 
tagis[HasFeat.fWepFin] + tagis[HasFeat.fComExp] > 0

This works because tagis[whatever] returns 1 if the container in question (the hero, in this case) has at least one copy of the referenced tag. So in the above example, the result will be 1 if the hero has one feat, 2 if they have both, and 0 if they have neither. So any result greater than zero is valid.
 
A follow-up question regarding this topic: I'm working on a feat that two different criteria to satisfy prerequisites.
Prerequisites: Tripping bite feat or (combat expertise and improved trip)

I'm trying to translate this in ExprReqs, but keep getting parsing errors. My latest attempt was
hero.tagexpr[HasFeat.fTrippBite] <> 0 | hero.tagexpr[HasFeat.fComExpert + HasFeat.fImpTrip] >= 2

What's the correct syntax to express this?
 
Bob - take another look at the examples, and look for where the "|" and "+" actually are. Right now, you're mixing them together, with + inside tagexpr, where it's not used, and | outside of a tagexpr, so that won't work either.


tagexpr (HasFeat.fTrippBite | (HasFeat.fComExpert & HasFeat.fImpTrip)] <> 0
 
Mathias said:
Bob - take another look at the examples, and look for where the "|" and "+" actually are. Right now, you're mixing them together, with + inside tagexpr, where it's not used, and | outside of a tagexpr, so that won't work either.


tagexpr[HasFeat.fTrippBite | (HasFeat.fComExpert & HasFeat.fImpTrip)] <> 0
Click to expand...

Got it, thanks Mathias. Working as expected now. I appreciate the assist, as always.
 
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