Still problems with ternary operators in arrays.

[koskinpark]

twig.js:^1.15.4

{% set classes = [ 'a-button', modifier ? modifier, ] %}

This returns now
{ classes: [ 0: undefined ] }

Normally, if modifier is not exist, we should return only ['a-button']. Or if it's exist -> it should return ['a-button', 'some-modifier-value'], or even ['a-button', ['some-modifier-value-1', 'some-modifier-value-2']]

[koskinpark]

We are trying to simulate drupal's behaviors in twig.js
Example of usage in Drupal https://git.drupalcode.org/project/drupal/-/blob/10.1.x/core/themes/claro/templates/form-element.html.twig#L26

[willrowe]

Can you provide an example of it working as expected in Twigfiddle?

[sarahjean]

@willrowe Here is a twigfiddle example, very simplified version of the Drupal example from @koskinpark : https://twigfiddle.com/caakml

[willrowe]

I did a little bit of testing with this and it appears to be an issue in the parsing of the array. If I break out each of the items into a separate print statement, it seems to work properly.

[dgervalle]

I can confirm @willrowe assessment, this is a very annoying parsing issue. Putting the ternary expression between brackets solve the issue.

Not working:
{% set classes = [ style_name ? 'image-style-' ~ style_name %}

Working:
{% set classes = [ (style_name ? 'image-style-' ~ style_name) ] %}

This is very annoying when simulating existing Drupal templates.

[arakwar]

While annoying, the brackets solution works and shouldn't be an issue for Drupal.

[sarahjean]

@arakwar They don't break anything on the Drupal side, you are right, but it is crummy to have to be aware of this to get your stuff working, twig.js should be as close to php twig as it can to be useful. A lot of folks may not find their way here and will probably ditch tools that are using this rather than come to the conclusion that there is a slight library mismatch, since the twig itself is valid syntax.

[arakwar]

@sarahjean I 100% agree that this needs to be fixed. My point is that the brackets should not interfere with Drupal, so anyone who wants to use this solution don't have to wait for the fix.