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2b7fb519ba
See the comment about why this is valuable. For a selector like:
.foo:is(.bar) > .baz
Before this patch we'd generate an Dependency for .bar like this:
Dependency {
selector: .bar,
offset: 0,
parent: Some(Dependency {
selector: .foo:is(.bar) > .baz,
offset: 1, // Pointing to the `>` combinator.
parent: None,
}),
}
After this patch we'd generate just:
Dependency {
selector: .foo:is(.bar) > .baz,
offset: 1, // Pointing to the `>` combinator.
parent: None,
}
This is not only less memory but also less work. The reason for that is that,
before this patch, when .bar changes, we'd look the dependency, and see there's
a parent, and then scan that, so we'd match `.bar` two times, one for the
initial dependency, and one for .foo:is(.bar).
Instead, with this we'd only check `.foo:is(.bar)` once.
Differential Revision: https://phabricator.services.mozilla.com/D71423
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| element | ||
| media_queries.rs | ||
| mod.rs | ||
| stylesheets.rs | ||