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stylo: Get rules from Gecko XBL stylesheets in cascading (Bug 1290276)

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This commit is contained in:
Ting-Yu Lin 2017-06-05 14:17:18 +08:00
parent ad47d33511
commit 2411749fcf
4 changed files with 138 additions and 11 deletions
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47
components/style/stylist.rs
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@ -917,6 +917,26 @@ impl Stylist {
self.quirks_mode = quirks_mode;
}
/// Returns the applicable CSS declarations for the given element by
/// treating us as an XBL stylesheet-only stylist.
pub fn push_applicable_declarations_as_xbl_only_stylist<E, V>(&self,
element: &E,
applicable_declarations: &mut V)
where E: TElement,
V: Push<ApplicableDeclarationBlock> + VecLike<ApplicableDeclarationBlock>,
{
let mut matching_context =
MatchingContext::new(MatchingMode::Normal, None);
let mut dummy_flag_setter = |_: &E, _: ElementSelectorFlags| {};
self.element_map.author.get_all_matching_rules(element,
element,
applicable_declarations,
&mut matching_context,
&mut dummy_flag_setter,
CascadeLevel::XBL);
}
/// Returns the applicable CSS declarations for the given element.
///
/// This corresponds to `ElementRuleCollector` in WebKit.
@ -1019,15 +1039,26 @@ impl Stylist {
debug!("skipping user rules");
}
// Step 3b: XBL rules.
let cut_off_inheritance =
rule_hash_target.get_declarations_from_xbl_bindings(applicable_declarations);
debug!("XBL: {:?}", context.relations);
if rule_hash_target.matches_user_and_author_rules() && !only_default_rules {
// Step 3b: Author normal rules.
map.author.get_all_matching_rules(element,
&rule_hash_target,
applicable_declarations,
context,
flags_setter,
CascadeLevel::AuthorNormal);
debug!("author normal: {:?}", context.relations);
// Gecko skips author normal rules if cutting off inheritance.
// See nsStyleSet::FileRules().
if !cut_off_inheritance {
// Step 3c: Author normal rules.
map.author.get_all_matching_rules(element,
&rule_hash_target,
applicable_declarations,
context,
flags_setter,
CascadeLevel::AuthorNormal);
debug!("author normal: {:?}", context.relations);
} else {
debug!("Skipping author normal rules due to cut off inheritance");
}
// Step 4: Normal style attributes.
if let Some(sa) = style_attribute {