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Introduce SelectorInner and use it for top-level matching.

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MozReview-Commit-ID: DxG6USsPIkh
This commit is contained in:
Bobby Holley 2017-04-15 15:03:46 -07:00
parent 11745fb983
commit 9524c5cb57
9 changed files with 138 additions and 109 deletions
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63
components/selectors/matching.rs
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@ -3,7 +3,7 @@
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use bloom::BloomFilter;
use parser::{CaseSensitivity, Combinator, ComplexSelector, LocalName};
use parser::{SimpleSelector, Selector};
use parser::{SimpleSelector, Selector, SelectorInner};
use precomputed_hash::PrecomputedHash;
use std::borrow::Borrow;
use tree::Element;
@ -92,27 +92,28 @@ impl ElementSelectorFlags {
}
}
pub fn matches<E>(selector_list: &[Selector<E::Impl>],
element: &E,
parent_bf: Option<&BloomFilter>)
-> bool
pub fn matches_selector_list<E>(selector_list: &[Selector<E::Impl>],
element: &E,
parent_bf: Option<&BloomFilter>)
-> bool
where E: Element
{
selector_list.iter().any(|selector| {
selector.pseudo_element.is_none() &&
matches_complex_selector(&*selector.complex_selector,
element,
parent_bf,
&mut StyleRelations::empty(),
&mut |_, _| {})
matches_selector(&selector.inner,
element,
parent_bf,
&mut StyleRelations::empty(),
&mut |_, _| {})
})
}
fn may_match<E>(mut selector: &ComplexSelector<E::Impl>,
fn may_match<E>(sel: &SelectorInner<E::Impl>,
bf: &BloomFilter)
-> bool
where E: Element,
{
let mut selector = &*sel.complex;
// See if the bloom filter can exclude any of the descendant selectors, and
// reject if we can.
loop {
@ -159,28 +160,24 @@ fn may_match<E>(mut selector: &ComplexSelector<E::Impl>,
}
/// Determines whether the given element matches the given complex selector.
pub fn matches_complex_selector<E, F>(selector: &ComplexSelector<E::Impl>,
element: &E,
parent_bf: Option<&BloomFilter>,
relations: &mut StyleRelations,
flags_setter: &mut F)
-> bool
pub fn matches_selector<E, F>(selector: &SelectorInner<E::Impl>,
element: &E,
parent_bf: Option<&BloomFilter>,
relations: &mut StyleRelations,
flags_setter: &mut F)
-> bool
where E: Element,
F: FnMut(&E, ElementSelectorFlags),
{
// Use the bloom filter to fast-reject.
if let Some(filter) = parent_bf {
if !may_match::<E>(selector, filter) {
return false;
}
}
match matches_complex_selector_internal(selector,
element,
relations,
flags_setter) {
SelectorMatchingResult::Matched => true,
_ => false
}
// Match the selector.
matches_complex_selector(&selector.complex, element, relations, flags_setter)
}
/// A result of selector matching, includes 3 failure types,
@ -233,6 +230,24 @@ enum SelectorMatchingResult {
NotMatchedGlobally,
}
/// Matches a complex selector.
pub fn matches_complex_selector<E, F>(selector: &ComplexSelector<E::Impl>,
element: &E,
relations: &mut StyleRelations,
flags_setter: &mut F)
-> bool
where E: Element,
F: FnMut(&E, ElementSelectorFlags),
{
match matches_complex_selector_internal(selector,
element,
relations,
flags_setter) {
SelectorMatchingResult::Matched => true,
_ => false
}
}
fn matches_complex_selector_internal<E, F>(selector: &ComplexSelector<E::Impl>,
element: &E,
relations: &mut StyleRelations,