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style: Add simple parsing and matching support for :has

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Parsing is behind a config value `layout.css.has-selectors.enabled`. This
change does not support p:has(> a) combinators, but will handle them
gracefully, just not matching on them.

Differential Revision: https://phabricator.services.mozilla.com/D149515
This commit is contained in:
Tiaan Louw 2022-06-20 08:53:02 +00:00 • committed by Martin Robinson
parent dcdf9f33d5
commit 3d0cf4dbf9
8 changed files with 85 additions and 10 deletions
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10
components/selectors/builder.rs
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@ -332,12 +332,14 @@ where
Component::NonTSPseudoClass(..) => {
specificity.class_like_selectors += 1;
},
Component::Negation(ref list) | Component::Is(ref list) => {
Component::Negation(ref list) |
Component::Is(ref list) |
Component::Has(ref list) => {
// https://drafts.csswg.org/selectors/#specificity-rules:
//
// The specificity of an :is() pseudo-class is replaced by the
// specificity of the most specific complex selector in its
// selector list argument.
// The specificity of an :is(), :not(), or :has() pseudo-class
// is replaced by the specificity of the most specific complex
// selector in its selector list argument.
let mut max = 0;
for selector in &**list {
max = std::cmp::max(selector.specificity(), max);