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Look for relevant links while matching

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Adjust the matching process to look for a "relevant link" while matching.  A
"relevant link" is the element being matched if it is a link or the nearest
ancestor link.

Matching for links now depends on the `VisitedHandlingMode`, which determines
whether all links match as if they are unvisited (the default) or if the
relevant link matches as visited (and all others remain unvisited).

If a relevant link is ever found for any selector, track this as part of the
`MatchingContext` object.  This is used in the next patch to determine if an
additional match and cascade should be performed to compute the styles when
visited.

MozReview-Commit-ID: 3xUbRo7vpuD
This commit is contained in:
J. Ryan Stinnett 2017-05-15 10:14:49 -05:00
parent 8ae546f7ea
commit e3a256803d
8 changed files with 197 additions and 55 deletions
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3
components/style/selector_parser.rs
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@ -103,9 +103,6 @@ pub enum PseudoElementCascadeType {
/// An extension to rust-selector's `Element` trait.
pub trait ElementExt: Element<Impl=SelectorImpl> + Debug {
/// Whether this element is a `link`.
fn is_link(&self) -> bool;
/// Whether this element should match user and author rules.
///
/// We use this for Native Anonymous Content in Gecko.