How can I check for multiple values in `where` at once?

Questions
1

I have a special use case where I would like to check not only for a single value in a where query, but rather multiple.

So instead of having:

#show raw.where(lang: "a"): it => {
#show raw.where(lang: "b"): it => {
#show raw.where(lang: "c"): it => {

I’m looking for something similar to:

#show raw.where(("a", "b").contains(lang)): it => {

Is there anything possible in this direction?

2

You can combine multiple selectors with .or() and .and() as per the docs. In your case this would look like this

#show raw.where(lang: "a").or(raw.where(lang: "b")).or(raw.where(lang: "c")): it => { ... }

I’m not sure if there is a way to generate the show rule programmatically, e.g. from a list of languages.

You could also take another approach by using a general show rule and then checking the language inside the show rule. This will certainly scale better and you will have more flexibility regarding the matching.

#show raw: it => {
  if it.lang == "some condition" {
    do something...
  }
  it
}
1 Like
3

To make it a bit more readable you can use the form selector.or(selector1, selector2, ...):

#show selector.or(
  raw.where(lang: "a"),
  raw.where(lang: "b"),
  raw.where(lang: "c"),
): it => {
  set text(red)
  it
}

and to generate the show rule from a list you can use an argument sink:

#let selectors = ("a", "b", "c").map(x => raw.where(lang: x))

#show selector.or(..selectors): it => {
  set text(red)
  it
}

(Welcome to the forum @the_kief ! I’ve slightly edited your question’s title to follow our guidelines.)

2 Likes
4

Thank you for the answers.

I’m very well aware that function execution and so on is something that will not be supported but I had the hopes that there still might be something that makes it a bit shorter.

@sijo could you tell me why the title was an issue so that I can watch out for it in the future?

5

It’s for consistency; we prefer titles to be a complete question as per the question guidelines:

Good titles are questions you would ask your friend about Typst.

We hope by adhering to this, we make the information in this forum easy to find in the future.

btw, thanks for using the right category and tag, unsing syntax highlighting, etc. and accepting the answer, it’s appreciated :slight_smile: