{skipIf} does not avoid printing last {sep}

[JanTvrdik]

Version: 2.10.3

Steps To Reproduce

{foreach [1, 2, 3] as $item}
    {skipIf $item === 3}
    {$item}{sep}, {/sep}
{/foreach}

https://fiddle.nette.org/latte/#14e8be81e2

Expected Behavior

The last comma should not be printed.

[dg]

How could this be solved?

[JanTvrdik]

I don't know. The only thing I can think of is to compile the {skipIf} to sth like $iterator->setFilter(fn($it) => $it === 3)), so the iterator itself is aware of the filter in order to properly evaluate isLast().

But that will of course work only in very limited set of scenarios, i.e. skipIf must be top-level and the expression may depend only on entry key/value. So it would probably need a custom syntax to make it actually work well, i.e. sth like

{foreach [1, 2, 3] as $item where $item === 3}
    {$item}{sep}, {/sep}
{/foreach}