Support for :has() selector

[124C41p]

Hi, do you plan to support the :has() selector? To my understanding, this css keyword is needed for selecting objects based on the parent of another known object.

Consider the following example:

<div>
    <div id="foo">
        Hi There!
    </div>
</div>
<ul>
    <li>first</li>
    <li>second</li>
    <li>third</li>
</ul>

In order to select the second list item, I would like to use the following selector:

let selector = Selector::parse("div:has(div#foo) + ul > li:nth-child(2)").unwrap();

This line however panics as of scraper version 0.18.1.

[adamreichold]

I think this is still missing support in our upstream dependency selectors dependency, at least in the version published on crates.io.

[cyqsimon]

+1. I'm trying to scrape Wikipedia, which has this sort of nesting. For example:

<h2>
  <span class="mw-headline" id="Registered_ports">Registered ports</span>
  <!-- ... -->
</h2>

This selector: h2:has(#Registered_ports) ~ .wikitable.sortable would pick the first table after this h2, which is a good way to locate the content in lieu of a distinctive id/class on the table itself.

[nicoburns]

From what I can see selectors 0.25 (published to crates.io) does have :has support. See https://docs.rs/selectors/latest/selectors/parser/enum.Component.html#variant.Has Although there seem to be performance improvements in more recent unreleased commits.

[nathaniel-daniel]

servo/servo#25133