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Implement an nth-index cache.

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MozReview-Commit-ID: Ee0um3QXkxl
This commit is contained in:
Bobby Holley 2017-09-20 13:13:24 -07:00
parent 29517d553e
commit 438740b912
13 changed files with 164 additions and 40 deletions
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18
components/selectors/tree.rs
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@ -8,11 +8,27 @@
use attr::{AttrSelectorOperation, NamespaceConstraint, CaseSensitivity};
use matching::{ElementSelectorFlags, LocalMatchingContext, MatchingContext, RelevantLinkStatus};
use parser::SelectorImpl;
use servo_arc::NonZeroPtrMut;
use std::fmt::Debug;
pub trait Element: Sized + Debug {
/// Opaque representation of an Element, for identity comparisons. We use
/// NonZeroPtrMut to get the NonZero optimization.
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
pub struct OpaqueElement(pub NonZeroPtrMut<()>);
impl OpaqueElement {
/// Creates a new OpaqueElement from an arbitrarily-typed pointer.
pub fn new<T>(ptr: *const T) -> Self {
OpaqueElement(NonZeroPtrMut::new(ptr as *const () as *mut ()))
}
}
pub trait Element: Sized + Clone + Debug {
type Impl: SelectorImpl;
/// Converts self into an opaque representation.
fn opaque(&self) -> OpaqueElement;
fn parent_element(&self) -> Option<Self>;
/// The parent of a given pseudo-element, after matching a pseudo-element