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Create a MatchingContext to group related matching args

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MozReview-Commit-ID: 7XZTn7HDXrm
This commit is contained in:
J. Ryan Stinnett 2017-05-15 10:13:22 -05:00
parent 0388e11db2
commit e385b81fc3
9 changed files with 91 additions and 83 deletions
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35
components/selectors/matching.rs
View file

@ -17,6 +17,7 @@ bitflags! {
/// the selector matching process.
///
/// This is used to implement efficient sharing.
#[derive(Default)]
pub flags StyleRelations: usize {
/// Whether this element is affected by an ID selector.
const AFFECTED_BY_ID_SELECTOR = 1 << 0,
@ -68,6 +69,16 @@ impl ElementSelectorFlags {
}
}
/// Data associated with the matching process for a element. This context is
/// used across many selectors for an element, so it's not appropriate for
/// transient data that applies to only a single selector.
#[derive(Default)]
pub struct MatchingContext {
/// Output that records certains relations between elements noticed during
/// matching (and also extended after matching).
pub relations: StyleRelations,
}
pub fn matches_selector_list<E>(selector_list: &[Selector<E::Impl>],
element: &E,
parent_bf: Option<&BloomFilter>)
@ -79,7 +90,7 @@ pub fn matches_selector_list<E>(selector_list: &[Selector<E::Impl>],
matches_selector(&selector.inner,
element,
parent_bf,
&mut StyleRelations::empty(),
&mut MatchingContext::default(),
&mut |_, _| {})
})
}
@ -108,7 +119,7 @@ fn may_match<E>(sel: &SelectorInner<E::Impl>,
pub fn matches_selector<E, F>(selector: &SelectorInner<E::Impl>,
element: &E,
parent_bf: Option<&BloomFilter>,
relations: &mut StyleRelations,
context: &mut MatchingContext,
flags_setter: &mut F)
-> bool
where E: Element,
@ -122,7 +133,7 @@ pub fn matches_selector<E, F>(selector: &SelectorInner<E::Impl>,
}
// Match the selector.
matches_complex_selector(&selector.complex, element, relations, flags_setter)
matches_complex_selector(&selector.complex, element, context, flags_setter)
}
/// A result of selector matching, includes 3 failure types,
@ -178,7 +189,7 @@ enum SelectorMatchingResult {
/// Matches a complex selector.
pub fn matches_complex_selector<E, F>(selector: &ComplexSelector<E::Impl>,
element: &E,
relations: &mut StyleRelations,
context: &mut MatchingContext,
flags_setter: &mut F)
-> bool
where E: Element,
@ -186,7 +197,7 @@ pub fn matches_complex_selector<E, F>(selector: &ComplexSelector<E::Impl>,
{
match matches_complex_selector_internal(selector.iter(),
element,
relations,
context,
flags_setter) {
SelectorMatchingResult::Matched => true,
_ => false
@ -195,14 +206,14 @@ pub fn matches_complex_selector<E, F>(selector: &ComplexSelector<E::Impl>,
fn matches_complex_selector_internal<E, F>(mut selector_iter: SelectorIter<E::Impl>,
element: &E,
relations: &mut StyleRelations,
context: &mut MatchingContext,
flags_setter: &mut F)
-> SelectorMatchingResult
where E: Element,
F: FnMut(&E, ElementSelectorFlags),
{
let matches_all_simple_selectors = selector_iter.all(|simple| {
matches_simple_selector(simple, element, relations, flags_setter)
matches_simple_selector(simple, element, context, flags_setter)
});
let combinator = selector_iter.next_sequence();
@ -233,7 +244,7 @@ fn matches_complex_selector_internal<E, F>(mut selector_iter: SelectorIter<E::Im
};
let result = matches_complex_selector_internal(selector_iter.clone(),
&element,
relations,
context,
flags_setter);
match (result, c) {
// Return the status immediately.
@ -276,7 +287,7 @@ fn matches_complex_selector_internal<E, F>(mut selector_iter: SelectorIter<E::Im
fn matches_simple_selector<E, F>(
selector: &Component<E::Impl>,
element: &E,
relations: &mut StyleRelations,
context: &mut MatchingContext,
flags_setter: &mut F)
-> bool
where E: Element,
@ -285,7 +296,7 @@ fn matches_simple_selector<E, F>(
macro_rules! relation_if {
($ex:expr, $flag:ident) => {
if $ex {
*relations |= $flag;
context.relations |= $flag;
true
} else {
false
@ -341,7 +352,7 @@ fn matches_simple_selector<E, F>(
false
}
Component::NonTSPseudoClass(ref pc) => {
element.match_non_ts_pseudo_class(pc, relations, flags_setter)
element.match_non_ts_pseudo_class(pc, context, flags_setter)
}
Component::FirstChild => {
matches_first_child(element, flags_setter)
@ -385,7 +396,7 @@ fn matches_simple_selector<E, F>(
matches_generic_nth_child(element, 0, 1, true, true, flags_setter)
}
Component::Negation(ref negated) => {
!negated.iter().all(|ss| matches_simple_selector(ss, element, relations, flags_setter))
!negated.iter().all(|ss| matches_simple_selector(ss, element, context, flags_setter))
}
}
}

4
components/selectors/tree.rs
View file

@ -5,7 +5,7 @@
//! Traits that nodes must implement. Breaks the otherwise-cyclic dependency between layout and
//! style.
use matching::{ElementSelectorFlags, StyleRelations};
use matching::{ElementSelectorFlags, MatchingContext};
use parser::{AttrSelector, SelectorImpl};
use std::ascii::AsciiExt;
@ -141,7 +141,7 @@ pub trait Element: MatchAttr + Sized {
fn match_non_ts_pseudo_class<F>(&self,
pc: &<Self::Impl as SelectorImpl>::NonTSPseudoClass,
relations: &mut StyleRelations,
context: &mut MatchingContext,
flags_setter: &mut F) -> bool
where F: FnMut(&Self, ElementSelectorFlags);