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Bug 1349651 - stylo: Implement HasAuthorSpecifiedRules.

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This commit is contained in:
Matt Brubeck 2017-05-09 09:54:24 -07:00
parent 121662aa57
commit 32d37795a2
8 changed files with 376 additions and 28 deletions
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66
components/style/stylist.rs
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@ -491,14 +491,47 @@ impl Stylist {
where E: TElement +
fmt::Debug +
PresentationalHintsSynthetizer
{
let rule_node = match self.lazy_pseudo_rules(guards, element, pseudo) {
Some(rule_node) => rule_node,
None => return None
};
// Read the comment on `precomputed_values_for_pseudo` to see why it's
// difficult to assert that display: contents nodes never arrive here
// (tl;dr: It doesn't apply for replaced elements and such, but the
// computed value is still "contents").
let computed =
properties::cascade(&self.device,
&rule_node,
guards,
Some(&**parent),
Some(&**parent),
None,
&RustLogReporter,
font_metrics,
CascadeFlags::empty(),
self.quirks_mode);
Some(ComputedStyle::new(rule_node, Arc::new(computed)))
}
/// Computes the rule node for a lazily-cascaded pseudo-element.
///
/// See the documentation on lazy pseudo-elements in
/// docs/components/style.md
pub fn lazy_pseudo_rules<E>(&self,
guards: &StylesheetGuards,
element: &E,
pseudo: &PseudoElement)
-> Option<StrongRuleNode>
where E: TElement + fmt::Debug + PresentationalHintsSynthetizer
{
debug_assert!(pseudo.is_lazy());
if self.pseudos_map.get(pseudo).is_none() {
return None;
return None
}
let mut declarations = vec![];
// Apply the selector flags. We should be in sequential mode
// already, so we can directly apply the parent flags.
let mut set_selector_flags = |element: &E, flags: ElementSelectorFlags| {
@ -524,6 +557,7 @@ impl Stylist {
};
let mut declarations = vec![];
self.push_applicable_declarations(element,
None,
None,
@ -533,32 +567,14 @@ impl Stylist {
guards,
&mut declarations,
&mut set_selector_flags);
if declarations.is_empty() {
return None
}
let rule_node =
self.rule_tree.insert_ordered_rules(
declarations.into_iter().map(|a| (a.source, a.level)));
// Read the comment on `precomputed_values_for_pseudo` to see why it's
// difficult to assert that display: contents nodes never arrive here
// (tl;dr: It doesn't apply for replaced elements and such, but the
// computed value is still "contents").
let computed =
properties::cascade(&self.device,
&rule_node,
guards,
Some(&**parent),
Some(&**parent),
None,
&RustLogReporter,
font_metrics,
CascadeFlags::empty(),
self.quirks_mode);
Some(ComputedStyle::new(rule_node, Arc::new(computed)))
let rule_node = self.rule_tree.insert_ordered_rules(declarations.into_iter().map(|a| {
(a.source, a.level)
}));
Some(rule_node)
}
/// Set a given device, which may change the styles that apply to the