How to set up argument using "or" in prerequisites

[Bob G]

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."

[ShadowChemosh]

In this specific case you can use a tagexpr[].

Example:

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

Check those tag ids I as don't remember them exactly but the example otherwise works.

[TheIronGolem]

Another thing you can do is combine tagis results and see what they add up to:

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.

[Bob G]

Thank you both, those suggestions are very helpful. I appreciate the help, as always.

[Bob G]

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?

[Mathias]

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

[Bob G]

Originally Posted by Mathias

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

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