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style: Match :lang() using snapshots correctly.

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Cameron McCormack 2017-06-07 12:30:10 +08:00
parent c7e2500311
commit f492c8fe6e
6 changed files with 134 additions and 11 deletions
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17
components/style/dom.rs
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@ -17,7 +17,8 @@ use properties::{ComputedValues, PropertyDeclarationBlock};
#[cfg(feature = "gecko")] use properties::animated_properties::AnimationValue;
#[cfg(feature = "gecko")] use properties::animated_properties::TransitionProperty;
use rule_tree::CascadeLevel;
use selector_parser::{ElementExt, PreExistingComputedValues, PseudoElement};
use selector_parser::{AttrValue, ElementExt, PreExistingComputedValues};
use selector_parser::{PseudoClassStringArg, PseudoElement};
use selectors::matching::{ElementSelectorFlags, VisitedHandlingMode};
use shared_lock::Locked;
use sink::Push;
@ -597,6 +598,20 @@ pub trait TElement : Eq + PartialEq + Debug + Hash + Sized + Copy + Clone +
existing_transitions: &HashMap<TransitionProperty,
Arc<AnimationValue>>)
-> bool;
/// Returns the value of the `xml:lang=""` attribute (or, if appropriate,
/// the `lang=""` attribute) on this element.
fn lang_attr(&self) -> Option<AttrValue>;
/// Returns whether this element's language matches the language tag
/// `value`. If `override_lang` is not `None`, it specifies the value
/// of the `xml:lang=""` or `lang=""` attribute to use in place of
/// looking at the element and its ancestors. (This argument is used
/// to implement matching of `:lang()` against snapshots.)
fn match_element_lang(&self,
override_lang: Option<Option<AttrValue>>,
value: &PseudoClassStringArg)
-> bool;
}
/// Trait abstracting over different kinds of dirty-descendants bits.